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Chart: Influenza A Virus Wastewater Data Source: CDC National Wastewater Surveillance System Week Ending: July 13, 2024 (Two-Week Maximum) Description from CDC site (not shown): This interactive map shows current site-level data for influenza A virus in wastewater. Each dot on the map represents a wastewater sampling site. Sites are categorized based on the current level of influenza A compared to the past levels at the same site during the 2023-2024 influenza season. When influenza A virus levels are at the 80th percentile or higher, CDC will work with relevant partners to better understand the factors that could be contributing to these levels. Map with circle markers for wastewater sites. Color scale runs from minimal (dark green) to high (dark purple) with grey for insufficient data. Dark purple for high wastewater site in south Oregon. Medium purple for above average sites in northeast Illinois and central Florida (obscured by other markers); also northeast California, central Florida again (obscured), southern California coast, and northwest Oregon (obsc.). Light purple for moderate in OR, IL, TX & NE. Green dots dense in Illinois, along central and southwestern California, and New Jersey into Delaware. Grey dots fill Ohio and southwest into North Carolina. Northern east coast & much of west coast also show dense clusters of monitoring sites, mostly in grey. Colorado and Oklahoma stand out with far more monitoring sites (most all grey) than states surrounding them.