USA Water Quality
Browse water hardness, PFAS levels, and quality ratings across 51 states and 4,560 cities. Sourced from the USGS Water Quality Portal & EPA.
Cities
4,560
with water data
States
51
USA
Avg Hardness
153mg/L
8.9 gpg
438 lab-verified
Category
🟠 Hard
National average
🔴 Hardest: South Dakota (348 mg/L)
🟢 Softest: Alaska (39 mg/L)
Alabama
🟡 Moderately Hard66 cities99 mg/L · 5.8 gpg
View cities →Alaska
🟢 Soft7 cities≈ 39 mg/L · 2.3 gpg
View cities →Arizona
🔴 Very Hard74 cities308 mg/L · 18.0 gpg
View cities →Arkansas
🟠 Hard39 cities139 mg/L · 8.1 gpg
View cities →California
🟡 Moderately Hard538 cities117 mg/L · 6.8 gpg
View cities →Colorado
🟡 Moderately Hard63 cities109 mg/L · 6.4 gpg
View cities →Connecticut
🟢 Soft76 cities53 mg/L · 3.1 gpg
View cities →Delaware
🟡 Moderately Hard11 cities100 mg/L · 5.8 gpg
View cities →District of Columbia
🟡 Moderately Hard32 cities116 mg/L · 6.8 gpg
View cities →Florida
🔴 Very Hard331 cities185 mg/L · 10.8 gpg
View cities →Georgia
🟡 Moderately Hard105 cities116 mg/L · 6.8 gpg
View cities →Hawaii
🟢 Soft51 cities≈ 47 mg/L · 2.7 gpg
View cities →Idaho
🟡 Moderately Hard24 cities111 mg/L · 6.5 gpg
View cities →Illinois
🔴 Very Hard260 cities197 mg/L · 11.5 gpg
View cities →Indiana
🔴 Very Hard82 cities216 mg/L · 12.6 gpg
View cities →Iowa
🔴 Very Hard40 cities251 mg/L · 14.7 gpg
View cities →Kansas
🔴 Very Hard36 cities287 mg/L · 16.8 gpg
View cities →Kentucky
🟠 Hard50 cities168 mg/L · 9.8 gpg
View cities →Louisiana
🟡 Moderately Hard63 cities107 mg/L · 6.3 gpg
View cities →Maine
🟢 Soft15 cities≈ 39 mg/L · 2.3 gpg
View cities →Maryland
🟠 Hard131 cities140 mg/L · 8.2 gpg
View cities →Massachusetts
🟡 Moderately Hard173 cities75 mg/L · 4.4 gpg
View cities →Michigan
🟠 Hard108 cities164 mg/L · 9.6 gpg
View cities →Minnesota
🔴 Very Hard99 cities202 mg/L · 11.8 gpg
View cities →Mississippi
🟡 Moderately Hard42 cities100 mg/L · 5.8 gpg
View cities →Missouri
🔴 Very Hard84 cities182 mg/L · 10.6 gpg
View cities →Montana
🟠 Hard7 cities123 mg/L · 7.2 gpg
View cities →Nebraska
🔴 Very Hard17 cities≈ 314 mg/L · 18.3 gpg
View cities →Nevada
🔴 Very Hard22 cities≈ 321 mg/L · 18.8 gpg
View cities →New Hampshire
🟢 Soft19 cities≈ 46 mg/L · 2.7 gpg
View cities →New Jersey
🟡 Moderately Hard207 cities107 mg/L · 6.3 gpg
View cities →New Mexico
🔴 Very Hard24 cities280 mg/L · 16.4 gpg
View cities →New York
🟡 Moderately Hard300 cities114 mg/L · 6.7 gpg
View cities →North Carolina
🟡 Moderately Hard89 cities110 mg/L · 6.4 gpg
View cities →North Dakota
🔴 Very Hard9 cities238 mg/L · 13.9 gpg
View cities →Ohio
🔴 Very Hard195 cities185 mg/L · 10.8 gpg
View cities →Oklahoma
🔴 Very Hard43 cities233 mg/L · 13.6 gpg
View cities →Oregon
🟢 Soft59 cities58 mg/L · 3.4 gpg
View cities →Pennsylvania
🟠 Hard154 cities146 mg/L · 8.5 gpg
View cities →Rhode Island
🟢 Soft29 cities≈ 56 mg/L · 3.3 gpg
View cities →South Carolina
🟡 Moderately Hard52 cities103 mg/L · 6.0 gpg
View cities →South Dakota
🔴 Very Hard11 cities348 mg/L · 20.3 gpg
View cities →Tennessee
🟠 Hard64 cities148 mg/L · 8.6 gpg
View cities →Texas
🔴 Very Hard255 cities261 mg/L · 15.2 gpg
View cities →Utah
🔴 Very Hard64 cities247 mg/L · 14.4 gpg
View cities →Vermont
🟢 Soft5 cities45 mg/L · 2.6 gpg
View cities →Virginia
🟠 Hard102 cities132 mg/L · 7.7 gpg
View cities →Washington
🟢 Soft121 cities49 mg/L · 2.9 gpg
View cities →West Virginia
🟠 Hard16 cities147 mg/L · 8.6 gpg
View cities →Wisconsin
🔴 Very Hard86 cities195 mg/L · 11.4 gpg
View cities →Wyoming
🟠 Hard10 cities131 mg/L · 7.7 gpg
View cities →