Water quality, place by place

Explore water quality across the country

PurityMap turns public drinking-water records into one connected system: a place, the utility that serves it, each measurement it reported, how that compares to the limit, and the evidence behind it. Start with your water.

Try Tucson, AZ, 85701, or a water system name.

Explore the national map

3,780

City reportsbuilt from public records

States & territoriescovered end to end

14,974

Lab measurementseach tied to its source

Contaminantstracked against limits

How to read a record

One place, several kinds of record

These are not the same thing, and PurityMap keeps them separate on purpose. Knowing which one you’re looking at is the difference between “my city’s water” and “what actually comes out of my tap.”

Place report

A city or county

A summary for where you live, assembled from the utility (or utilities) that serve it. The best place to start when you know the town but not the water system.

Supplier report

A water system

The utility’s own monitoring record — the substances it tested for, the results it reported, and how each compares to its regulatory limit. This is the primary source a place report is built from.

Your tap

What we can’t see

Records describe the water a utility delivers to the system — not your building’s pipes or fixtures. Only a test at your own tap measures that. We tell you which, always.

Ways in

Find your way into the data

Come at it from wherever you already know something — your address, your state, the utility’s name, or a contaminant you’re worried about.

Browse by stateEvery state and territory with published city reports, drilling down to the place you live.Jump to the state list →Water systemsThe utilities themselves — each supplier’s monitoring record, finding by finding, tied to its source.Explore suppliers →ContaminantsWhat we track and how it’s measured — PFAS, lead, disinfection by-products and more, against the limit.See what we track →National mapThe whole picture at a glance: coverage and findings across the country on one map.Open the map →How we analyze waterThe method behind every record: where the data comes from, how findings are graded, what we won’t claim.Read the methodology →Find my waterStart from your address, city, ZIP, or utility and we route you to the right record.Find my water →

Browse by state

Water quality by state

States appear here once at least one city report is published, each linking through to city reports built from the supplier’s own monitoring records.

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

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