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Wastewater SCAN Dashboard

Timely detection of viruses like SARS-CoV-2, through community wastewater partnerships.

This dashboard reports results from the methods developed by SCAN. Learn more

About the data

How do I interpret this data?

Rather than looking at one data point, we recommend monitoring trends over time. Our analysis suggests that the concentrations of the SARS-CoV-2 genes are highly correlated to COVID-19 incidence rates in the sewersheds [read the research].

How should I read these results?

Results may be filtered by location to view SARS-CoV-2 RNA occurrence in wastewater. Each location includes the SARS-CoV-2 copies per gram of dry solid waste and the copies per gram of the Omicron variant.

The data in the chart and graph have been smoothed, where measurements from nearby dates have been combined to reduce day-to-day variability and increase accuracy. Specifically, we take the 5 samples centered around a date and report the average after excluding the highest and lowest values. This processing minimizes the influence of outlier measurements and makes it easier to visualize trends in the data.

If the target is not detected in the sample, the concentration is reported as 0 c/g. There may still be very low amounts of the target present that are below the detection limits of our procedure. When a sample was not tested for a target, the concentration for that target is reported as “-”.

Please see the data dictionary for more information about each column shown in the table view.

What does “copies per gram” mean?

Results reported as copies of SARS-CoV-2 per gram (dry weight) of wastewater solids tells you how many copies of the SARS-CoV-2 virus were found in a gram of solid waste from a location. This data point can be used as an indicator of how many people in a sewershed (the geographical area served by a particular treatment plant) have COVID-19. Over time you will see this value rise and fall, indicative of more or less COVID-19 clinical cases in the population served by wastewater treatment plants.


MK Wolfe et al. Sept 2021 mSystems. High-Frequency, High-Throughput Quantification of SARS-CoV-2 RNA in Wastewater Settled Solids at Eight Publicly Owned Treatment Works in Northern California Shows Strong Association with COVID-19 Incidence.

About SCAN

Wastewater as an Early Indicator

Working closely with practitioners in sewage treatment and public health, SCAN developed a way to monitor levels of the virus that causes COVID-19 (SARS-CoV-2) in wastewater that is simpler than large-scale diagnostic testing, gives an accurate population-level view, and delivers results more quickly.

WastewaterScan shares results with health and other officials and the public within 24 hours. Its dashboards show results over time in a way that’s comparable and understandable. Based on the information, health officials can plan and adjust tactics to reduce the spread of COVID-19.

Sewage as Sentinel

WastewaterScan powered by Verily was born out of a project called “SCAN” by Stanford, the University of Michigan, and Emory. The methods developed during this project provide a comprehensive view of COVID-19 in a community.

To find more information about SCAN, please visit

To see how SCAN reports its data, visit

Help us advance community health

As the laboratory partner for SCAN’s research, Verily is offering communities across the United States a new opportunity to monitor their own wastewater for COVID-19 using SCAN’s methods.

Participation in WastewaterScan powered by Verily will last for at least one year. The program provides testing, sampling supplies and shipping free of charge to treatment plants.

Sewage treatment plants will get kits to sample wastewater solids three times a week and ship them for lab analysis at no cost. Verily will report results through this dashboard within 48 hours of receiving samples.

Learn more about the sampling kit and process here.

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All results are understood to be based on inputs that are experimental in nature, and are not intended to diagnose or treat any disease. The results are provided “as is” and without warranty of any kind, notwithstanding any specifications provided by Verily or requests made by any party, including, without limitation, any performance characteristics of the samples or compliance by their use with any laws or regulations. Verily specifically disclaims all express and implied warranties of title, noninfringement, merchantability and fitness for any particular purpose. Verily is not liable for any claim arising out of or in connection with the disclosure of these results.