City Water Quality Rankings
11,561 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#529
Longport
County, NJ
100 A
#530 Longville
County, LA
100 A
#531 Los Alamos
County, CA
100 A
#532 Los Osos
County, CA
100 A
#533 Lothian
County, MD
100 A
#534 Loxley
County, AL
100 A
#535 Lucerne
County, CO
100 A
#536 Ludington
County, MI
100 A
#537 Lyman
County, NE
100 A
#538 Lyman
County, SC
100 A
#539 Lyndonville
County, NY
100 A
#540 Lyons
County, CO
100 A
#541 Mabelvale
County, AR
100 A
#542 Machias
County, ME
100 A
#543 Madawaska
County, ME
100 A
#544 Madison
County, SD
100 A
#545 Madison Heights
County, MI
100 A
#546 Maize
County, KS
100 A
#547 Malta
County, OH
100 A
#548 Manchester
County, NH
100 A
#549 Mandan
County, ND
100 A
#550 Manhattan
County, KS
100 A
#551 Mankato
County, MN
100 A
#552 Mantorville
County, MN
100 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.