California vs Texas
Statewide drinking water quality comparison — violation rates, PFAS prevalence, and system-level risk
Quick Answer
Texas has a lower open-violation rate (0.3% vs. 8.6%). California has 579 utilities with PFAS records (49.0%) vs. 959 in Texas (34.7%).
CA · 1,182 utilities
8.6%
Open violation rate
49.0%
PFAS detection rate
0
High/critical risk
100.0%
Safe/low risk
TX · 2,761 utilities
0.3%
Open violation rate
34.7%
PFAS detection rate
0
High/critical risk
100.0%
Safe/low risk
Head-to-Head Comparison
| Metric | California | Texas |
|---|---|---|
| Total Utilities | 1,182 | 2,761 |
| Population Served | 36,400,000 | 29,000,000 |
| Well Water % | 15% on private wells | 22% on private wells |
| Open Violation Rate | 8.6%(102 utilities) | 0.3%(8 utilities) |
| PFAS Detection Rate | 49.0%(579 utilities) | 34.7%(959 utilities) |
| High/Critical Risk Utilities | 0 | 0 |
| Safe/Low Risk Rate | 100.0%(1182 utilities) | 100.0%(2760 utilities) |
| Top Contaminants |
State Profiles
California
California's drinking water comes from a complex mix of surface water (rivers, reservoirs) and groundwater. The state has some of the strictest water quality regulations in the U.S., but still faces challenges from agricultural runoff, legacy industrial contamination, and aging infrastructure in older cities. The State Water Resources Control Board maintains primacy for Safe Drinking Water Act enforcement.
Highest-Risk Systems
Texas
Texas has more public water systems than any other state. Groundwater from the Ogallala and Edwards aquifers serves millions of Texans. Naturally occurring arsenic is elevated in parts of West Texas, and agricultural nitrate contamination is a documented concern in rural areas. TCEQ holds primary enforcement authority over Texas water systems.
Highest-Risk Systems
Key Differences
Open violation rate: California at 8.6% vs. Texas at 0.3%. Texas has a lower rate of systems with unresolved health-based violations.
PFAS detection: California has PFAS records at 49.0% of utilities vs. 34.7% in Texas. Rates reflect UCMR 5 monitoring (2023–2025).
Well water reliance: California (15% on private wells) vs. Texas (22% on private wells). Private well users are not regulated under the Safe Drinking Water Act and should test independently.