WEEKLY DATA
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MAP
ANALYTICS
COVID TREND
FLU A TREND
CHART VIEW
SITES
LEGEND
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CDC NWSS — National Wastewater Surveillance System. Sites report weekly.
VIRAL ACTIVITY LEVEL
Very High
VERY HIGH
High
HIGH
Moderate
MOD
Low
LOW
Very Low
V.LOW
No Data
N/D
Pathogens: SARS-CoV-2, Influenza A, RSV
Method: qPCR/ddPCR on 24-hr flow-weighted composite influent
Lead time: ~4–7 days ahead of clinical case counts
Wastewater Signal by Site
MA NWSS monitoring stations · latest week · CDC data
LEVEL:
Very High
High
Moderate
Low
Very Low
No Data
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COVID-19 Wastewater Trend
Sites ranked by 3-measurement rolling average · highest signal first
#Site3-Week Avg SignalLatest Level15-day Δ
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Influenza A Wastewater Trend
Sites ranked by 3-measurement rolling average · highest signal first
#Site3-Week Avg SignalLatest Level15-day Δ
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All Sites — Signal Comparison
Horizontal bars · towns stacked vertically · percentile rank
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Sites: — Reporting: — Updated: — CDC NWSS · MapLibre GL 4.7.1 · OpenFreeMap

About — MA NWSS Wastewater Surveillance

CDC NWSS Open Data · Wastewater Signals · MapLibre GL

This map visualizes wastewater disease surveillance for Massachusetts, drawn from the CDC’s National Wastewater Surveillance System (NWSS) open-data API. Sewage samples from treatment plants across the state are tested for viral genetic material, and the dashboard plots each collection site’s signal for SARS-CoV-2 (COVID-19), Influenza A, and RSV — ranked by percentile strength with a recent 15-day trend. NWSS publishes on a weekly cadence, so this reflects the latest weekly readings rather than minute-to-minute data.

Switch between the map, an analytics table, COVID and Flu trend rankings, and a chart view; toggle pathogens on or off; and click a collection site for its detail. It is built on MapLibre GL with OpenFreeMap tiles — a working example of turning an open public-health feed into an at-a-glance read on where respiratory-virus signals are rising or falling across the state.