Interactive tool
Los Angeles vs Richmond
Put any two U.S. counties side by side on drinking-water violations, PFAS detection, and system coverage, straight from EPA SDWIS and UCMR5 testing.
- 3,254
- Counties available
- 63
- States & territories
- 142,471
- Water systems covered
According to the EPA's Safe Drinking Water Information System (SDWIS) and UCMR5 testing program, every figure in this comparison is pulled directly from official public water-system records. See our methodology for how violations and PFAS detections are counted.
Choose Counties to Compare
Water Systems
Water Systems
276
1
Population Served
10,109,089
8,271,000
Systems with Violations
257
(93.1%)
1
(100.0%)
Violations
Total Violations
3,972
47
Health-Based Violations
MCL exceedances & treatment failures
1,260
(31.7%)
19
(40.4%)
Avg Violations / System
14.4
47.0
PFAS Contamination
Systems Tested for PFAS
117
1
PFAS Detected
95(81.2% rate)
0(0.0% rate)
Better relative to comparison
Worse relative to comparison
Equal / neutral
Los Angeles County, Full Profile
California · 276 systems · 10,109,089 served
Richmond County, Full Profile
New York · 1 systems · 8,271,000 served
Data source: EPA Safe Drinking Water Information System (SDWIS) and UCMR5 PFAS monitoring program.
Teal = better (fewer violations / more systems),
amber = worse (more violations / fewer systems).
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.