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United States

It depends on the town. 8,261 of 9,612 listed water systems in the United States are low risk (85.9%).

TexasMontanaCaliforniaNew MexicoNevadaArizonaMichiganOregonColoradoWyomingMinnesotaIdahoUtahSouth DakotaKansasNorth DakotaNebraskaWashingtonWisconsinMissouriOklahomaIllinoisIowaNew YorkGeorgiaArkansasFloridaAlabamaPennsylvaniaNorth CarolinaOhioMississippiLouisianaTennesseeKentuckyVirginiaIndianaMaineSouth CarolinaWest VirginiaVermontNew HampshireMarylandMassachusettsNew JerseyConnecticutDelawareRhode IslandDistrict of ColumbiaAlaskaAlaskaHawaiiHawaiiPuerto RicoPuerto Rico
Open an area for its towns. Green means every listed water system there is low risk. Orange or red means every listed system is high or critical risk. Any other area has mixed ratings. Alaska, Hawaii, and Puerto Rico are drawn apart from the mainland.
Alabama302 water systems · 278 low riskAlaska24 water systems · 20 low riskArizona160 water systems · 114 low riskArkansas163 water systems · 144 low riskCalifornia660 water systems · 595 low riskColorado175 water systems · 163 low riskConnecticut59 water systems · 56 low riskDelaware36 water systems · 36 low riskDistrict of Columbia3 water systems · 1 low riskFlorida388 water systems · 369 low riskGeorgia251 water systems · 226 low riskHawaii42 water systems · 42 low riskIdaho60 water systems · 54 low riskIllinois448 water systems · 389 low riskIndiana209 water systems · 192 low riskIowa140 water systems · 135 low riskKansas92 water systems · 81 low riskKentucky220 water systems · 185 low riskLouisiana255 water systems · 159 low riskMaine36 water systems · 35 low riskMaryland73 water systems · 60 low riskMassachusetts260 water systems · 233 low riskMichigan290 water systems · 263 low riskMinnesota189 water systems · 184 low riskMississippi202 water systems · 159 low riskMissouri221 water systems · 205 low riskMontana35 water systems · 33 low riskNebraska44 water systems · 38 low riskNevada35 water systems · 31 low riskNew Hampshire45 water systems · 43 low riskNew Jersey241 water systems · 200 low riskNew Mexico75 water systems · 51 low riskNew York301 water systems · 282 low riskNorth Carolina280 water systems · 186 low riskNorth Dakota37 water systems · 36 low riskOhio314 water systems · 266 low riskOklahoma146 water systems · 50 low riskOregon118 water systems · 110 low riskPennsylvania334 water systems · 288 low riskPuerto Rico98 water systems · 86 low riskRhode Island28 water systems · 26 low riskSouth Carolina162 water systems · 149 low riskSouth Dakota50 water systems · 45 low riskTennessee279 water systems · 258 low riskTexas1,178 water systems · 975 low riskUtah121 water systems · 117 low riskVermont34 water systems · 30 low riskVirginia150 water systems · 136 low riskWashington236 water systems · 230 low riskWest Virginia94 water systems · 61 low riskWisconsin189 water systems · 132 low riskWyoming30 water systems · 24 low risk

Source

US EPA Safe Drinking Water Information System.

Period covered: October 2023 to September 2026.

Covers community water systems serving 3,300 people or more. The rating uses health-based violations of federal drinking-water standards in the last three years, and whether those violations have been fixed. Each system is placed at a town it serves, so positions are approximate.

Common questions

Can I drink the tap water in the United States?

It depends on the town. 8,261 of 9,612 listed water systems in the United States are low risk (85.9%).

Where do these ratings come from?

US EPA Safe Drinking Water Information System. Period covered: October 2023 to September 2026.