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  • #1

    CDC - Influenza A National Wastewater Data

    from CDC -

    Influenza A National Wastewater Data


    Influenza A Wastewater Monitoring in the U.S.

    Print


    Nationally, the wastewater viral activity level for influenza A is currently very low. See influenza A data for your state/territory and county


    On This Page
    Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

    Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

    Current Wastewater Viral Activity Levels


    This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: July 13, 2025 - July 19, 2025

    Skip Over Map Container U.S. territories

    GUVI Influenza A Wastewater Viral Activity Levels


    Select a level to add or remove from map.
    • Very High
    • High
    • Moderate
    • Low
    • Very Low
    • No Data
    • *Limited Coverage



    * Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
    Data last updated 2025-07-24

    Link to Dataset Download Data (CSV) Skip Data Table
    Data Table Skipped data table.
    National Trends


    This chart shows national trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
    Very LowLowModerateHighVery High08/17/2409/28/2411/09/2412/21/2402/01/2503/15/2504/26/2506/07/2507/19/25Week Ending
    Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

    Data last updated 2025-07-24

    Link to Dataset Download Data (CSV) Skip Data Table
    Data Table Skipped data table.
    What Does this Data Mean?


    Situational Summary
    • The ongoing avian influenza A (H5) (bird flu) outbreak in U.S dairy cows and poultry may be contributing to the moderate and high influenza (flu) A virus wastewater levels in some jurisdictions, based on reviewing multiple data sources. The risk to the public of avian influenza A (H5) is currently low.
    • Wastewater data for influenza A virus should be considered in combination with clinical sources of influenza A data.
    • Influenza A viruses include subtypes like avian influenza A(H5) virus and A(H1N1). Wastewater testing for overall influenza A virus cannot tell us what subtypes are present. Wastewater testing cannot tell us if the source of the influenza A virus is from humans, animals, or animal products.
    • Wastewater testing for influenza virus subtypes, including an H5 subtype, is underway across the United States. See Wastewater Data for Avian Influenza A(H5) for more information.
    • CDC and public health partners continue to investigate whether changing levels of influenza A virus in wastewater are related to seasonal influenza, the avian influenza A (H5) outbreak in animals, or both.



    About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
    • Up to 1.6 – Very Low
    • Greater than 1.6 and up to 4.5 – Low
    • Greater than 4.5 and up to 12.2 – Moderate
    • Greater than 12.2 and up to 20.1 – High
    • Greater than 20.1 – Very High

    National data represent the median values across all wastewater treatment plants. To learn more on how the wastewater viral activity level is calculated, see Data Methods.

    Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

    Related Pages
    Source: Centers for Disease Control and Prevention​

    https://www.cdc.gov/nwss/rv/influenzaa-national-data.html

    Tags: None
    • Stuck
  • #2
    Influenza A National Wastewater Data


    Influenza A Wastewater Monitoring in the U.S.

    Print


    Nationally, the wastewater viral activity level for influenza A is currently very low. See influenza A data for your state/territory and county


    On This Page
    Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

    Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

    Current Wastewater Viral Activity Levels


    This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data.

    Time Period: July 20, 2025 - July 26, 2025

    Skip Over Map Container U.S. territories

    GUVI

    Influenza A Wastewater Viral Activity Levels


    Select a level to add or remove from map.
    • Very High
    • High
    • Moderate
    • Low
    • Very Low
    • No Data
    • *Limited Coverage



    * Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
    Data last updated 2025-07-31

    Link to Dataset Download Data (CSV) Skip Data Table
    Data Table Skipped data table.
    National Trends


    This chart shows national trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
    Very LowLowModerateHighVery High08/24/2410/05/2411/16/2412/28/2402/08/2503/22/2505/03/2506/14/2507/26/25Week Ending
    Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

    Data last updated 2025-07-31

    Link to Dataset Download Data (CSV) Skip Data Table
    Data Table Skipped data table.
    What Does this Data Mean?


    Situational Summary
    • The ongoing avian influenza A (H5) (bird flu) outbreak in U.S dairy cows and poultry may be contributing to the moderate and high influenza (flu) A virus wastewater levels in some jurisdictions, based on reviewing multiple data sources. The risk to the public of avian influenza A (H5) is currently low.
    • Wastewater data for influenza A virus should be considered in combination with clinical sources of influenza A data.
    • Influenza A viruses include subtypes like avian influenza A(H5) virus and A(H1N1). Wastewater testing for overall influenza A virus cannot tell us what subtypes are present. Wastewater testing cannot tell us if the source of the influenza A virus is from humans, animals, or animal products.
    • Wastewater testing for influenza virus subtypes, including an H5 subtype, is underway across the United States. See Wastewater Data for Avian Influenza A(H5) for more information.
    • CDC and public health partners continue to investigate whether changing levels of influenza A virus in wastewater are related to seasonal influenza, the avian influenza A (H5) outbreak in animals, or both.



    About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
    • Up to 1.6 – Very Low
    • Greater than 1.6 and up to 4.5 – Low
    • Greater than 4.5 and up to 12.2 – Moderate
    • Greater than 12.2 and up to 20.1 – High
    • Greater than 20.1 – Very High

    National data represent the median values across all wastewater treatment plants. To learn more on how the wastewater viral activity level is calculated, see Data Methods.

    Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

    Related Pages ​https://www.cdc.gov/nwss/rv/Influenz...onal-data.html

    Comment

    • #3
      Influenza A National Wastewater Data


      Influenza A Wastewater Monitoring in the U.S.

      Print


      Nationally, the wastewater viral activity level for influenza A is currently very low. See influenza A data for your state/territory and county


      On This Page
      Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

      Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

      Current Wastewater Viral Activity Levels


      This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: July 27, 2025 - August 02, 2025

      Skip Over Map Container U.S. territories

      GUVI Influenza A Wastewater Viral Activity Levels


      Select a level to add or remove from map.
      • Very High
      • High
      • Moderate
      • Low
      • Very Low
      • No Data
      • *Limited Coverage



      * Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
      Data last updated 2025-08-07

      Link to Dataset Download Data (CSV) Skip Data Table
      Data Table Skipped data table.
      National Trends


      This chart shows national trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
      Very LowLowModerateHighVery High08/31/2410/12/2411/23/2401/04/2502/15/2503/29/2505/10/2506/21/2508/02/25Week Ending
      Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

      Data last updated 2025-08-07

      Link to Dataset Download Data (CSV) Skip Data Table
      Data Table Skipped data table.
      What Does this Data Mean?


      Situational Summary
      • The ongoing avian influenza A (H5) (bird flu) outbreak in U.S dairy cows and poultry may be contributing to the moderate and high influenza (flu) A virus wastewater levels in some jurisdictions, based on reviewing multiple data sources. The risk to the public of avian influenza A (H5) is currently low.
      • Wastewater data for influenza A virus should be considered in combination with clinical sources of influenza A data.
      • Influenza A viruses include subtypes like avian influenza A(H5) virus and A(H1N1). Wastewater testing for overall influenza A virus cannot tell us what subtypes are present. Wastewater testing cannot tell us if the source of the influenza A virus is from humans, animals, or animal products.
      • Wastewater testing for influenza virus subtypes, including an H5 subtype, is underway across the United States. See Wastewater Data for Avian Influenza A(H5) for more information.
      • CDC and public health partners continue to investigate whether changing levels of influenza A virus in wastewater are related to seasonal influenza, the avian influenza A (H5) outbreak in animals, or both.



      About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
      • Up to 1.6 – Very Low
      • Greater than 1.6 and up to 4.5 – Low
      • Greater than 4.5 and up to 12.2 – Moderate
      • Greater than 12.2 and up to 20.1 – High
      • Greater than 20.1 – Very High

      National data represent the median values across all wastewater treatment plants. To learn more on how the wastewater viral activity level is calculated, see Data Methods.

      Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

      Related Pages ​https://www.cdc.gov/nwss/rv/Influenz...onal-data.html

      Comment

      • #4
        Influenza A National Wastewater Data


        Influenza A Wastewater Monitoring in the U.S.

        Print


        Nationally, the wastewater viral activity level for influenza A is currently very low.

        Region with the highest wastewater viral activity level for influenza A:
        NA


        On This Page
        Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

        Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

        Current Wastewater Viral Activity Levels


        This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: August 03, 2025 - August 09, 2025

        Skip Over Map Container U.S. territories

        GUGUVI Influenza A Wastewater Viral Activity Levels


        Select a level to add or remove from map.
        • Very High
        • High
        • Moderate
        • Low
        • Very Low
        • No Data
        • *Limited Coverage



        * Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
        Data last updated 2025-08-14

        Link to Dataset Download Data (CSV) Skip Data Table
        Data Table Skipped data table.
        National and Regional Trends


        This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
        Very LowLowModerateHighVery High09/07/2410/19/2411/30/2401/11/2502/22/2504/05/2505/17/2506/28/2508/09/25Week Ending
        Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

        Data last updated 2025-08-14

        Link to Dataset Download Data (CSV) Skip Data Table
        Data Table Skipped data table.



        On August 15, 2025, CDC updated the methodology used to calculate the wastewater viral activity level. For more information, visit CDC’s Wastewater Surveillance Data Methodology page.

        About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
        • Up to 2.7 – Very Low
        • Greater than 2.7 and up to 6.2 – Low
        • Greater than 6.2 and up to 11.2 – Moderate
        • Greater than 11.2 and up to 17.6 – High
        • Greater than 17.6 – Very High

        To learn more on how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page.

        Regions: States and territories are grouped into the following U.S Census Bureau regions:
        • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
        • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
        • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
        • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)

        No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
        • No data were reported this week from sites within the state or territory
        • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.

        Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

        Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

        Related Pages ​https://www.cdc.gov/nwss/rv/Influenz...onal-data.html

        Comment

        • #5
          Influenza A National Wastewater Data


          Influenza A Wastewater Monitoring in the U.S.

          Print


          Nationally, the wastewater viral activity level for influenza A is currently very low.

          Region with the highest wastewater viral activity level for influenza A:
          NA


          On This Page
          Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

          Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

          Current Wastewater Viral Activity Levels


          This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: August 17, 2025 - August 23, 2025

          Skip Over Map Container
          U.S. territoriesGUGUVI Influenza A Wastewater Viral Activity Levels


          Select a level to add or remove from map.
          • Very High
          • High
          • Moderate
          • Low
          • Very Low
          • No Data
          • *Limited Coverage



          * Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
          Data last updated 2025-08-28

          Link to Dataset Download Data (CSV) Skip Data Table
          Data Table Skipped data table.
          National and Regional Trends


          This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
          Very LowLowModerateHighVery High09/21/2411/02/2412/14/2401/25/2503/08/2504/19/2505/31/2507/12/2508/23/25Week Ending
          Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

          Data last updated 2025-08-28

          Link to Dataset Download Data (CSV) Skip Data Table
          Data Table Skipped data table.



          On August 15, 2025, CDC updated the methodology used to calculate the wastewater viral activity level. For more information, visit CDC’s Wastewater Surveillance Data Methodology page.

          About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
          • Up to 2.7 – Very Low
          • Greater than 2.7 and up to 6.2 – Low
          • Greater than 6.2 and up to 11.2 – Moderate
          • Greater than 11.2 and up to 17.6 – High
          • Greater than 17.6 – Very High

          To learn more on how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page.

          Regions: States and territories are grouped into the following U.S Census Bureau regions:
          • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
          • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
          • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
          • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)

          No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
          • No data were reported this week from sites within the state or territory
          • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.

          Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

          Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

          Related Pages ​https://www.cdc.gov/nwss/rv/Influenz...onal-data.html

          Comment

          • #6
            Influenza A National Wastewater Data


            Influenza A Wastewater Monitoring in the U.S.

            Print


            Nationally, the wastewater viral activity level for influenza A is currently very low.

            Region with the highest wastewater viral activity level for influenza A:
            NA


            On This Page
            Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

            Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

            Current Wastewater Viral Activity Levels


            This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: August 24, 2025 - August 30, 2025

            Skip Over Map Container
            U.S. territoriesGUGUVI Influenza A Wastewater Viral Activity Levels


            Select a level to add or remove from map.
            • Very High
            • High
            • Moderate
            • Low
            • Very Low
            • No Data
            • *Limited Coverage



            * Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
            Data last updated 2025-09-04

            Link to Dataset Download Data (CSV) Skip Data Table
            Data Table Skipped data table.
            National and Regional Trends


            This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
            Very LowLowModerateHighVery High09/28/2411/09/2412/21/2402/01/2503/15/2504/26/2506/07/2507/19/2508/30/25Week Ending
            Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

            Data last updated FromDB

            Link to Dataset Download Data (CSV) Skip Data Table
            Data Table Skipped data table.



            On August 15, 2025, CDC updated the methodology used to calculate the wastewater viral activity level. For more information, visit CDC’s Wastewater Surveillance Data Methodology page.

            About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
            • Up to 2.7 – Very Low
            • Greater than 2.7 and up to 6.2 – Low
            • Greater than 6.2 and up to 11.2 – Moderate
            • Greater than 11.2 and up to 17.6 – High
            • Greater than 17.6 – Very High

            To learn more on how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page.

            Regions: States and territories are grouped into the following U.S Census Bureau regions:
            • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
            • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
            • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
            • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)

            No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
            • No data were reported this week from sites within the state or territory
            • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.

            Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

            Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

            Related Pages ​https://www.cdc.gov/nwss/rv/Influenz...onal-data.html

            Comment

            • #7
              Influenza A National Wastewater Data


              Influenza A Wastewater Monitoring in the U.S.

              Print


              Nationally, the wastewater viral activity level for influenza A is currently very low.

              Region with the highest wastewater viral activity level for influenza A:
              NA


              On This Page
              Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

              Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

              Current Wastewater Viral Activity Levels


              This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: August 31, 2025 - September 06, 2025

              Skip Over Map Container
              U.S. territoriesGUGUVI Influenza A Wastewater Viral Activity Levels


              Select a level to add or remove from map.
              • Very High
              • High
              • Moderate
              • Low
              • Very Low
              • No Data
              • *Limited Coverage



              * Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
              Data last updated 2025-09-11

              Link to Dataset Download Data (CSV) Skip Data Table
              Data Table Skipped data table.
              National and Regional Trends


              This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
              Very LowLowModerateHighVery High10/05/2411/16/2412/28/2402/08/2503/22/2505/03/2506/14/2507/26/2509/06/25Week Ending
              Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

              Data last updated 2025-09-11

              Link to Dataset Download Data (CSV) Skip Data Table
              Data Table Skipped data table.



              About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
              • Up to 2.7 – Very Low
              • Greater than 2.7 and up to 6.2 – Low
              • Greater than 6.2 and up to 11.2 – Moderate
              • Greater than 11.2 and up to 17.6 – High
              • Greater than 17.6 – Very High

              To learn more on how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page.

              Regions: States and territories are grouped into the following U.S Census Bureau regions:
              • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
              • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
              • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
              • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)

              No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
              • No data were reported this week from sites within the state or territory
              • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.

              Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

              Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

              Related Pages ​https://www.cdc.gov/nwss/rv/Influenz...onal-data.html

              Comment

              • #8
                Influenza A National Wastewater Data


                Influenza A Wastewater Monitoring in the U.S.

                Print


                Nationally, the wastewater viral activity level for influenza A is currently very low.

                Region with the highest wastewater viral activity level for influenza A:
                NA


                On This Page
                Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

                Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

                Current Wastewater Viral Activity Levels


                This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: September 07, 2025 - September 13, 2025

                Skip Over Map Container
                U.S. territoriesGUGUVI Influenza A Wastewater Viral Activity Levels


                Select a level to add or remove from map.
                • Very High
                • High
                • Moderate
                • Low
                • Very Low
                • No Data
                • *Limited Coverage



                * Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
                Data last updated 2025-09-18

                Link to Dataset Download Data (CSV) Skip Data Table
                Data Table Skipped data table.
                National and Regional Trends


                This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
                Very LowLowModerateHighVery High10/12/2411/23/2401/04/2502/15/2503/29/2505/10/2506/21/2508/02/2509/13/25Week Ending
                Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

                Data last updated FromDB

                Link to Dataset Download Data (CSV) Skip Data Table
                Data Table Skipped data table.



                About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
                • Up to 2.7 – Very Low
                • Greater than 2.7 and up to 6.2 – Low
                • Greater than 6.2 and up to 11.2 – Moderate
                • Greater than 11.2 and up to 17.6 – High
                • Greater than 17.6 – Very High

                To learn more on how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page.

                Regions: States and territories are grouped into the following U.S Census Bureau regions:
                • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
                • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
                • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
                • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)

                No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
                • No data were reported this week from sites within the state or territory
                • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.

                Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

                Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

                Related Pages ​https://www.cdc.gov/nwss/rv/Influenz...onal-data.html

                Comment

                • #9
                  Influenza A National Wastewater Data


                  Influenza A Wastewater Monitoring in the U.S.

                  Print


                  Nationally, the wastewater viral activity level for influenza A is currently very low.

                  Region with the highest wastewater viral activity level for influenza A:
                  NA


                  On This Page
                  Wastewater monitoring can detect viruses spreading from one person to another within a community earlier than clinical testing and before people who are sick go to their doctor or hospital. It can also detect infections without symptoms. If you see increased wastewater viral activity levels, it might indicate that there is a higher risk of infection. See how to protect yourself from respiratory viruses.

                  Wastewater data are updated every Friday with the previous week’s data, which allows for data to be reviewed for accuracy. Data may change as more reports are received.

                  Current Wastewater Viral Activity Levels


                  This map shows the current wastewater viral activity level of influenza A for each state or territory. Tap or hover over a state or territory to see the viral activity level and number of sites reporting data. Time Period: September 14, 2025 - September 20, 2025

                  Skip Over Map Container
                  U.S. territoriesGUGUVI Influenza A Wastewater Viral Activity Levels


                  Select a level to add or remove from map.
                  • Very High
                  • High
                  • Moderate
                  • Low
                  • Very Low
                  • No Data
                  • *Limited Coverage



                  * Based on a small segment (less than 5%) of the population and may not be representative of the state/territory.
                  Data last updated 2025-09-25

                  Link to Dataset Download Data (CSV) Skip Data Table
                  Data Table Skipped data table.
                  National and Regional Trends


                  This chart shows national and regional trends of wastewater viral activity levels of influenza A. 1 Year6 Months45 DaysAll Results Skip Over Chart Container
                  Very LowLowModerateHighVery High10/19/2411/30/2401/11/2502/22/2504/05/2505/17/2506/28/2508/09/2509/20/25Week Ending
                  Data from the most recent two weeks may be incomplete due to delays in data reporting. These data sets are subject to change and are indicated by the gray shading.

                  Data last updated 2025-09-25

                  Link to Dataset Download Data (CSV) Skip Data Table
                  Data Table Skipped data table.



                  About the Wastewater Viral Activity Level: The wastewater viral activity level indicates whether the amount of virus in the wastewater is very low, low, moderate, high, or very high. The wastewater viral activity levels may indicate the risk of infection in an area. The wastewater viral activity levels are categorized as follows:
                  • Up to 2.7 – Very Low
                  • Greater than 2.7 and up to 6.2 – Low
                  • Greater than 6.2 and up to 11.2 – Moderate
                  • Greater than 11.2 and up to 17.6 – High
                  • Greater than 17.6 – Very High

                  To learn more about how the wastewater viral activity level is calculated, visit CDC’s Wastewater Surveillance Data Methodology page. Additional wastewater data are available at CDC Wastewater Data for Influenza A.

                  Regions: States and territories are grouped into the following U.S Census Bureau regions:
                  • West: Alaska, Arizona, California, Colorado, Guam, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming (N=14)
                  • Midwest: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin (N=12)
                  • Northeast: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Puerto Rico, Rhode Island, Vermont (N=10)
                  • South: Arkansas, Alabama, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia (N=17)

                  No Data: States or territories without sufficient data to estimate the wastewater viral activity level for the previous week are indicated as “No Data.” A label of “No Data” means that either:
                  • No data were reported this week from sites within the state or territory
                  • Data were reported this week, but sites within the state or territory do not have enough data (at least 8 weeks with consistent methodology) to estimate the wastewater viral activity level in the last week.

                  Limited Coverage: States or territories with limited coverage means that data for the most recent week are based on a small part (less than 5%) of the population and may not represent viral activity levels for the entire state or territory.

                  Data Limitations: Wastewater data cannot determine the source of influenza A viruses. Detections could come from a human or from an animal (like a bird) or an animal product (like milk from an infected cow).

                  Related Pages ​https://www.cdc.gov/nwss/rv/Influenz...onal-data.html

                  Comment

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