City Water Quality Rankings
11,696 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#4201
New London
County, WI
92 A
#4202 New Site
County, MS
92 A
#4203 New Strawn
County, KS
92 A
#4204 New Wilmington
County, PA
92 A
#4205 New Windsor
County, NY
92 A
#4206 Newburg
County, WV
92 A
#4207 Newnan
County, GA
92 A
#4208 Newport
County, OR
92 A
#4209 Newton
County, AL
92 A
#4210 Niwot
County, CO
92 A
#4211 Nokomis
County, IL
92 A
#4212 Nolanville
County, TX
92 A
#4213 Norman
County, OK
92 A
#4214 North Brookfield
County, MA
92 A
#4215 North Woodstock
County, NH
92 A
#4216 Northfield
County, IL
92 A
#4217 Oak Grove
County, KY
92 A
#4218 Oak Harbor
County, OH
92 A
#4219 Oak View
County, CA
92 A
#4220 Oakdale
County, MN
92 A
#4221 Oakland
County, MD
92 A
#4222 Ojai
County, CA
92 A
#4223 Olney
County, IL
92 A
#4224 Oneida
County, TN
92 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.