Cities and states
125 cities in 39 states and Washington, DC, plus PFAS testing for all 50 states, listed A–Z. We don’t rank them: utilities sample in different years and at different points.
Alabama · UCMR 5: 307 systems tested
Alabama water quality
Alaska · UCMR 5: 30 systems tested
Alaska water quality by city
Anchorage
Arkansas · UCMR 5: 172 systems tested
Arkansas water quality
California · UCMR 5: 707 systems tested
California water quality by city
AnaheimBerkeleyFresnoIrvineLong BeachLos AngelesMountain ViewOaklandPalm SpringsPalo AltoSacramentoSan DiegoSan FranciscoSan JoseSanta BarbaraSanta ClaraSanta CruzSanta MonicaSouth Lake TahoeSunnyvaleVentura
Colorado · UCMR 5: 165 systems tested
Colorado water quality by city
Connecticut · UCMR 5: 63 systems tested
Connecticut water quality by city
New Haven
Delaware · UCMR 5: 36 systems tested
Delaware water quality
Florida · UCMR 5: 409 systems tested
Florida water quality by city
Hawaii · UCMR 5: 45 systems tested
Hawaii water quality by city
Honolulu
Idaho · UCMR 5: 61 systems tested
Idaho water quality by city
Boise
Indiana · UCMR 5: 230 systems tested
Indiana water quality by city
Fort WayneIndianapolis
Iowa · UCMR 5: 152 systems tested
Iowa water quality by city
AmesDes MoinesIowa City
Kansas · UCMR 5: 103 systems tested
Kansas water quality by city
Wichita
Kentucky · UCMR 5: 231 systems tested
Kentucky water quality by city
Louisville
Maine · UCMR 5: 41 systems tested
Maine water quality
Maryland · UCMR 5: 83 systems tested
Maryland water quality by city
Baltimore
Michigan · UCMR 5: 319 systems tested
Michigan water quality by city
Minnesota · UCMR 5: 196 systems tested
Minnesota water quality by city
Brooklyn ParkEaganMaple GroveMinneapolisPlymouthSt. PaulWoodbury
Mississippi · UCMR 5: 239 systems tested
Mississippi water quality
Missouri · UCMR 5: 232 systems tested
Missouri water quality by city
Kansas CitySt. Louis
Montana · UCMR 5: 45 systems tested
Montana water quality
Nebraska · UCMR 5: 53 systems tested
Nebraska water quality by city
LincolnOmaha
New Hampshire · UCMR 5: 51 systems tested
New Hampshire water quality
New Jersey · UCMR 5: 266 systems tested
New Jersey water quality by city
Jersey CityNewark
New Mexico · UCMR 5: 73 systems tested
New Mexico water quality by city
AlbuquerqueSanta Fe
New York State · UCMR 5: 334 systems tested
New York State water quality by city
North Carolina · UCMR 5: 291 systems tested
North Carolina water quality by city
AshevilleBurlingtonCharlotteDurhamRaleighWilmington
North Dakota · UCMR 5: 38 systems tested
North Dakota water quality
Ohio · UCMR 5: 347 systems tested
Ohio water quality by city
CincinnatiClevelandColumbusToledo
Oklahoma · UCMR 5: 166 systems tested
Oklahoma water quality by city
Oklahoma CityTulsa
Rhode Island · UCMR 5: 29 systems tested
Rhode Island water quality by city
Providence
South Carolina · UCMR 5: 165 systems tested
South Carolina water quality by city
CharlestonMyrtle Beach
South Dakota · UCMR 5: 49 systems tested
South Dakota water quality by city
Sioux Falls
Texas · UCMR 5: 1,154 systems tested
Texas water quality by city
ArlingtonAustinCorpus ChristiDallasEl PasoFort WorthHoustonLaredoLubbockPasadenaPflugervilleSan Antonio
Utah · UCMR 5: 129 systems tested
Utah water quality by city
Salt Lake City
Vermont · UCMR 5: 38 systems tested
Vermont water quality
Virginia · UCMR 5: 171 systems tested
Virginia water quality by city
RichmondVirginia Beach
Washington State · UCMR 5: 248 systems tested
Washington State water quality by city
West Virginia · UCMR 5: 103 systems tested
West Virginia water quality
Wisconsin · UCMR 5: 202 systems tested
Wisconsin water quality by city
MadisonMilwaukee
Wyoming · UCMR 5: 33 systems tested
Wyoming water quality
District of Columbia · UCMR 5: 3 systems tested
Washington, DC tap water
Hardness by city
Hard water leaves scale but has no federal health limit. Figures from each utility’s latest report. Cities whose report gives no hardness figure are left out.
Ann Arbor, MI
126 mg/L (7.4 gpg)
Average, hard; range 74–180 mg/L
Austin, TX
93 mg/L (5.4 gpg)
Average, moderately hard; range 70–126 mg/L
Berkeley, CA
14–160 mg/L (0.8–9.4 gpg)
Range, soft to hard
Cincinnati, OH
126–140 mg/L (7.4–8.2 gpg)
Range, hard
Columbus, OH
98–125 mg/L (5.7–7.3 gpg)
Average by source, moderately hard to hard
Corpus Christi, TX
236 mg/L (13.8 gpg)
Average, very hard
Denver, CO
105 mg/L (6.1 gpg)
Average, moderately hard; range 55–124 mg/L
Detroit, MI
107 mg/L (6.3 gpg)
Average, moderately hard; range 96–142 mg/L
Fresno, CA
129 mg/L (7.5 gpg)
Average, hard; range 87–150 mg/L
Houston, TX
135.5 mg/L (7.9 gpg)
Average, hard; range 43.5–229 mg/L
Indianapolis, IN
317 mg/L (18.5 gpg)
Average, very hard; range 148–460 mg/L
Las Vegas, NV
280 mg/L (16.4 gpg)
Average, very hard
Los Angeles, CA
103–236 mg/L (6.0–13.8 gpg)
Average by source, moderately hard to very hard
Louisville, KY
128 mg/L (7.5 gpg)
Average, hard
Memphis, TN
48 mg/L (2.8 gpg)
Average, soft; range 14–150 mg/L
New York, NY
32 mg/L (1.9 gpg)
Average, soft; range 18–100 mg/L
Oakland, CA
14–160 mg/L (0.8–9.4 gpg)
Range, soft to hard
Palm Springs, CA
30–340 mg/L (1.8–19.9 gpg)
Average by source, soft to very hard
Portland, OR
7–80 mg/L (0.4–4.7 gpg)
Range, soft to moderately hard
Sacramento, CA
83 mg/L (4.9 gpg)
Average, moderately hard; range 15–154 mg/L
Salt Lake City, UT
136–571 mg/L (8.0–33.4 gpg)
Range, hard to very hard
San Diego, CA
145–243 mg/L (8.5–14.2 gpg)
Average by source, hard to very hard
San Francisco, CA
62 mg/L (3.6 gpg)
Average, moderately hard; range 8.1–112 mg/L
San Jose, CA
99–288 mg/L (5.8–16.8 gpg)
Average by source, moderately hard to very hard
Santa Barbara, CA
44–464 mg/L (2.6–27.1 gpg)
Average by source, soft to very hard
Tampa, FL
211 mg/L (12.3 gpg)
Average, very hard
Washington, DC
139 mg/L (8.1 gpg)
Average, hard; range 84–194 mg/L
Classes: USGS (0–60 mg/L soft, 61–120 moderately hard, 121–180 hard, above 180 very hard).
How to read a water quality report
The terms below are the ones these reports use. What the numbers mean for your glass, and what to check at your own tap, is in is tap water safe to drink.
- MCL
- Maximum contaminant level: the legal limit a utility must meet.
- MCLG
- Goal: the level with no known health risk. Not enforceable. For lead, arsenic and PFOA/PFOS it is zero.
- Action level
- For lead and copper: if more than 10% of sampled homes exceed it, the utility must act. Lead: 15 ppb, 10 ppb from Nov 1, 2027.
- 90th percentile
- 9 in 10 sampled homes were at or below this number.
- MRDL
- Limit for disinfectants such as chlorine and chloramine: 4.0 mg/L.
- Health reference level
- EPA screening value for unregulated contaminants. Not a legal limit.
- ppb · ppt
- Parts per billion (µg/L) and parts per trillion (ng/L).
Sources: EPA drinking water regulations, Lead and Copper Rule Improvements, EPA Consumer Confidence Reports.