City Water Quality Rankings
11,696 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#4081
Imperial
County, CA
92 A
#4082 Imperial
County, MO
92 A
#4083 Imperial
County, NE
92 A
#4084 Indian Head
County, MD
92 A
#4085 Iselin
County, NJ
92 A
#4086 Island Lake
County, IL
92 A
#4087 Ithaca
County, NY
92 A
#4088 Iuka
County, MS
92 A
#4089 Jack
County, AL
92 A
#4090 Jackson
County, AL
92 A
#4091 Jacksonville
County, AL
92 A
#4092 Jaffrey
County, NH
92 A
#4093 Jamestown
County, OH
92 A
#4094 Jasper
County, TN
92 A
#4095 Jerome
County, ID
92 A
#4096 Jersey Village
County, TX
92 A
#4097 Johnson
County, VT
92 A
#4098 Johnson City
County, KS
92 A
#4099 Kaufman
County, TX
92 A
#4100 Kearney
County, MO
92 A
#4101 Kilmarnock
County, VA
92 A
#4102 Kingsland
County, TX
92 A
#4103 Kingston Springs
County, TN
92 A
#4104 Kinston
County, AL
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.