City Water Quality Rankings
11,696 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#601
Largo
County, MD
100 A
#602 Larkspur
County, CA
100 A
#603 Lathrop
County, CA
100 A
#604 Laurel
County, MD
100 A
#605 Lawson
County, MO
100 A
#606 Laytonville
County, CA
100 A
#607 Leachville
County, AR
100 A
#608 Lead
County, SD
100 A
#609 League City
County, TX
100 A
#610 Leesburg
County, VA
100 A
#611 Lenexa
County, KS
100 A
#612 Lenox
County, MI
100 A
#613 Lepanto
County, AR
100 A
#614 Lewiston
County, ID
100 A
#615 Lewiston
County, NC
100 A
#616 Lewisville
County, AR
100 A
#617 Lewisville
County, TX
100 A
#618 Lexington
County, VA
100 A
#619 Liberty Lake
County, WA
100 A
#620 Ligonier
County, IN
100 A
#621 Lincoln
County, CA
100 A
#622 Lincoln
County, NE
100 A
#623 Lincoln
County, RI
100 A
#624 Linden
County, CA
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.