National water intelligence

America’s Water Intelligence Map

Explore cities with published PurityMap reports. Color represents the city-level Purity Score only where the underlying record supports one; it is not a statewide safety verdict.

National coverage

3,047 covered cities
3,047 scored cities
51 state reports

Find a covered city

Purity Score view

Showing 3,047 of 3,047 covered cities

Purity Score75+55–74under 55not scored

Browse covered cities

3,047 matches

Jump to state

Showing the first 300 of 3,047. Refine the sort, state, or filter to narrow the list.

How to use the map

Start broad. Finish with the evidence.

Search or scan

Find a covered city or use the score bands to inspect the published dataset.

Open a city

Select a marker to open its city report, including findings, measurements, limitations, and sources.

Confirm your system

City boundaries and service areas can differ. Resolve the supplier behind your tap before acting.

Find my water system →

Read the map correctly

Coverage is not a household test.

Markers summarize published city records and do not prove what is present at a specific address or tap. A grey marker means PurityMap has a city report without a supported score, not that the water is safe or unsafe. Scores reflect reported evidence and its limits.

How PurityMap analyzes water →

Browse the evidence

Water quality by state

Open a state report for systems, cities, contaminant coverage, source context, and known data gaps.

Alabama129 cities Alaska4 cities Arizona36 cities Arkansas53 cities California342 cities Colorado94 cities Connecticut20 cities Delaware9 cities District of Columbia1 city Florida182 cities Georgia121 cities Hawaii11 cities Idaho21 cities Illinois193 cities Indiana72 cities Iowa37 cities Kansas30 cities Kentucky75 cities Louisiana67 cities Maine11 cities Maryland29 cities Massachusetts166 cities Michigan131 cities Minnesota93 cities Mississippi44 cities Missouri63 cities Montana10 cities Nebraska15 cities Nevada14 cities New Hampshire16 cities New Jersey140 cities New Mexico29 cities New York123 cities North Carolina127 cities North Dakota8 cities Ohio115 cities Oklahoma44 cities Oregon66 cities Pennsylvania99 cities Rhode Island14 cities South Carolina73 cities South Dakota15 cities Tennessee147 cities Texas363 cities Utah66 cities Vermont8 cities Virginia61 cities Washington115 cities West Virginia19 cities Wisconsin95 cities Wyoming13 cities