Wastewater Continues to Provide an Effective Means to Track COVID-19 and Other Diseases

December 20, 2024 By Laura Schultz Wastewater avian influenza, bird flu, coronavirus, covid-19, influenza, lab tests, mpox, rsv, viral activity, viruses, wastewater data, wastewater surveillance, wastewater testing 0
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Tracking viral activity in wastewater emerged as a valuable way to map and monitor the spread of COVID-19 early on in the coronavirus pandemic. Many viruses can be tracked through wastewater data, as virus fragments can be excreted into wastewater even when individuals do not have symptoms of the virus. Wastewater operators send samples of untreated wastewater to laboratories, where technicians test the water to find out what viruses are currently circulating in a community. This can help public health officials guide their communities through infection prevention, testing, and vaccination, as necessary.

Poliovirus was the first virus widely tracked through wastewater surveillance, beginning in the 1990s as part of efforts to finally fully eradicate polio. But public awareness of this concept became more widely known with COVID-19. The height of  the pandemic has passed, but many tracking efforts continue in order to keep tabs on the disease’s current threat level and to advance continued research into it.

Newsweek continues to publish an updated COVID map each week showing the results of the past week’s viral monitoring across the United States. See the December 18 update here. It reveals the highest viral activity for SARS-CoV-2 virus (which causes COVID-19) in Arizona, New Mexico, Massachusetts, Minnesota, Missouri, and South Dakota.

The data for these updates comes directly from the U.S. Centers for Disease Control and Prevention (CDC), which also has multiple publicly accessible dashboards showing data for COVID-19 and other diseases tracked by the National Wastewater Surveillance System (NWSS).

Find the dashboards for the viruses tracked by the NWSS here:

Many states also run their own dashboards of surveillance data for COVID-19 and other viruses, including:

Notably, California has also recently found H5N1 bird flu virus in the wastewater from cities like Los Angeles and San Francisco, reflecting the rise of avian influenza. The CDC has an avian influenza tracker as a subset of the Influenza A dashboard. As of December 14, the vast majority of H5N1 found in wastewater has been in California, with the most recent additional detections so far found in Nevada, Utah, Wyoming, and Texas. It has also been detected in Hawai’i.

Not every wastewater treatment plant in a given state participates in tracking, so it should be kept in mind that the available data is a snapshot of only a portion of the state’s population. Tracking programs can incur significant expenses for wastewater utilities that can be out of reach especially for smaller operations. But there are often opportunities to engage in partnerships with other entities to reduce or erase these costs, such as what the Abilene Taylor County Public Health Department recently began with Baylor University in Texas.


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