City Water Quality Rankings
11,696 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#4825
Janesville
County, WI
90 A
#4826 Jay
County, FL
90 A
#4827 Jeffers
County, MN
90 A
#4828 Jemison
County, AL
90 A
#4829 Johns Island
County, SC
90 A
#4830 Johnson
County, NE
90 A
#4831 Jonesville
County, NC
90 A
#4832 Joppa
County, AL
90 A
#4833 Jupiter
County, FL
90 A
#4834 Keller
County, TX
90 A
#4835 Kellogg
County, ID
90 A
#4836 Kennebunk
County, ME
90 A
#4837 Kingsford
County, MI
90 A
#4838 Knoxville
County, TN
90 A
#4839 Kountze
County, TX
90 A
#4840 La Habra
County, CA
90 A
#4841 La Monte
County, MO
90 A
#4842 Lake Bronson
County, MN
90 A
#4843 Lake Crystal
County, MN
90 A
#4844 Lake Delton
County, WI
90 A
#4845 Lakeville
County, MA
90 A
#4846 Lakewood
County, OH
90 A
#4847 Lamar
County, CO
90 A
#4848 Lanark
County, IL
90 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.