City Water Quality Rankings
11,696 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#3457
Newton
County, UT
94 A
#3458 Norfolk
County, NE
94 A
#3459 Norh Collins
County, NY
94 A
#3460 North Baltimore
County, OH
94 A
#3461 North Newton
County, KS
94 A
#3462 North Reading
County, MA
94 A
#3463 North Zulch
County, TX
94 A
#3464 Norwood
County, OH
94 A
#3465 Oakland
County, TN
94 A
#3466 Ocean Gate
County, NJ
94 A
#3467 Oceano
County, CA
94 A
#3468 Odin
County, IL
94 A
#3469 Odon
County, IN
94 A
#3470 Oglethorpe
County, GA
94 A
#3471 Ohatchee
County, AL
94 A
#3472 Olive Branch
County, IL
94 A
#3473 Olton
County, TX
94 A
#3474 Omaha
County, NE
94 A
#3475 Ontario
County, NY
94 A
#3476 Oquawka
County, IL
94 A
#3477 Orono
County, ME
94 A
#3478 Orosi
County, CA
94 A
#3479 Oxford
County, KS
94 A
#3480 Palmdale
County, CA
94 A
Frequently Asked Questions
How are city water quality rankings calculated?
WaterQ city rankings are based on EPA SDWIS data across local public water systems, including contaminant detections, compliance violations, and recency-weighted score signals.
Can I compare two US cities directly?
Yes. Use the city comparison links on this page or open the Compare tool to evaluate two cities side by side on score, grade, and water system coverage.
How often does WaterQ refresh city data?
City-level metrics refresh when new EPA data is processed. Check city pages for latest score and violation context.