Public Water Systems
187 water systems based on EPA SDWIS data.
100
San Jose Water Company A
CA4310011 San Jose, CA 1,000,000 served
100
San Francisco Public Utilities Commission A
CA3810001 San Francisco, CA 884,363 served
100
East Bay Municipal Utility District A
CA0110005 Oakland, CA 1,400,000 served
100
California Water Service - Bakersfield A
CA1510006 Bakersfield, CA 407,615 served
100
Houston Public Works A
TX1010001 Houston, TX 2,300,000 served
100
Austin Water Utility A
TX2270001 Austin, TX 964,251 served
100
City of Corpus Christi Water A
TX1780001 Corpus Christi, TX 326,586 served
100
City of Buffalo Water Authority A
NY1510001 Buffalo, NY 278,349 served
100
City of Rochester Water Bureau A
NY2720001 Rochester, NY 211,328 served
100
City of Tallahassee Utilities A
FL3740141 Tallahassee, FL 196,169 served
100
Lehigh County Authority A
PA3390020 Allentown, PA 126,092 served
100
City of Akron Water Supply A
OH7710001 Akron, OH 190,469 served
100
Augusta Utilities Department A
GA2450001 Augusta, GA 202,081 served
100
Charlotte Water A
NC0132010 Charlotte, NC 879,709 served
100
Newark Water Department A
NJ0714001 Newark, NJ 311,549 served
100
Norfolk Water A
VA3800100 Norfolk, VA 244,076 served
100
City of Spokane Water A
WA3210001 Spokane, WA 228,989 served
100
City of Phoenix Water Services A
AZ0410001 Phoenix, AZ 1,626,078 served
100
Tucson Water A
AZ1010001 Tucson, AZ 548,073 served
100
City of Mesa Water A
AZ0410080 Mesa, AZ 508,958 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.