Public Water Systems
7,929 water systems based on EPA SDWIS data.
100
Mankato A
MN1070009 Mankato, MN 42,803 served 4 violations
100
Empire A
MN1190009 Farmington, MN 3,152 served 4 violations
100
Little Walnut Water Treatment Facility A
OH2303212 Lancaster, OH 1,428 served
100
Selma Estates A
VA6107660 Ashburn, VA 1,540 served
100
Elysian Heights A
VA6107555 Ashburn, VA 1,061 served
100
Albuquerque Water System A
NM3510701 Albuquerque, NM 560,326 served
100
Hays County Wcid 1 A
TX1050137 Austin, TX 2,850 served
100
Powhatan Courthouse A
VA4145675 Rockville, VA 3,005 served
100
E Jefferson Ww District 1 A
LA1051001 Jefferson, LA 275,163 served
100
Aqua Ohio - Mohawk Pws A
OH1000812 Massillon, OH 2,376 served 1 violation
100
Holly Ridge Lodge Water System A
LA1083018 Grand Junction, CO 1,350 served
100
Suburban Water Systems-Covina Knolls A
CA1910200 Covina, CA 1,437 served
100
Suburban Water Systems-Glendora A
CA1910046 Covina, CA 5,249 served
100
Suburban Water Systems-La Mirada A
CA1910059 Covina, CA 56,793 served
100
Knolls Atomic Power Lab (Kapl) A
NY4520559 Schenectady, NY 2,200 served 1 violation
100
Cheniere Drew North Water System A
LA1073100 West Monroe, LA 11,280 served
100
Aqua Ohio - Massillon Pws A
OH7604512 Massillon, OH 95,636 served
100
Magnolia-Monterey Subdivision A
LA1103148 Des Peres, MO 1,356 served
100
Otsego A
MN1860026 Otsego, MN 19,000 served
100
Mountain View A
VA2023020 Rockville, VA 2,773 served
Frequently Asked Questions
How do I find the best public water systems near me?
Use this list sorted by Best Score to review top-performing systems by EPA SDWIS data, then open each system page for contaminants, violations, and population served.
What does the WaterQ score mean for a public water system?
The WaterQ score (0-100) summarizes contaminant detections, compliance history, and recent violations. Higher scores generally indicate cleaner and more compliant drinking water records.
How often are public water system rankings updated?
WaterQ refreshes rankings when new EPA data is processed. For the latest context, open a system detail page and review the most recent test and violation information.