City Water Quality Rankings
11,561 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#649
North Lewisburg
County, OH
100 A
#650 North Little Rock
County, AR
100 A
#651 North Tonawanda
County, NY
100 A
#652 Northbridge
County, MA
100 A
#653 Northglenn
County, CO
100 A
#654 Northlake
County, TX
100 A
#655 Norwalk
County, CA
100 A
#656 Norwalk
County, CT
100 A
#657 Norwich
County, NY
100 A
#658 Norwood Young America
County, MN
100 A
#659 Notasulga
County, AL
100 A
#660 Novi
County, MI
100 A
#661 Nuevo
County, CA
100 A
#662 Nunica
County, MI
100 A
#663 Oak Island
County, NC
100 A
#664 Oakbrook Terrace
County, IL
100 A
#665 Oakley
County, CA
100 A
#666 Oblong
County, IL
100 A
#667 Old Fields
County, WV
100 A
#668 Oppelo
County, AR
100 A
#669 Oregon City
County, OR
100 A
#670 Oregon House
County, CA
100 A
#671 Oronoco
County, MN
100 A
#672 Orwell
County, OH
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.