California
Water Quality Report
89 Good
Average Score
89/100
Water Systems
1,081
Population
40.9M
Violations
2881 543 unresolved
Score Distribution
588 A
80 B
19 C
4 D
23 F
Top Contaminant Violations
| Contaminant | Violations |
|---|---|
| Copper (90th percentile) | 21 |
| Lead (90th percentile) | 5 |
Lowest Scoring Water Systems
0
Redding Rancheria F
090605083 Redding, CA 2,015 served
0
Soboba F
090600151 San Jacinto, CA 3,000 served
0
San Pasqual District A F
090605017 Valley Center, CA 1,225 served
0
Santa Rosa Rancheria F
090600148 Lemoore, CA 1,000 served
0
Santa Rosa Tachi Palace F
090605136 Lemoore, CA 9,000 served
Counties in California
Los Angeles County
3 systems
83 B
San Diego County
2 systems
84 B
Orange County
1 systems
73 B
Riverside County
1 systems
69 C
San Bernardino County
111 systems
66 C
Santa Clara County
1 systems
100 A
Alameda County
1 systems
100 A
Sacramento County
1 systems
93 A
Fresno County
1 systems
89 B
Kern County
1 systems
100 A
Cities in California
View all 599 cities →Popular City Comparisons in California
Quickly compare major cities in California by water quality score and grade.
Frequently Asked Questions
Is tap water in California safe to drink?
California has an average WaterQ score of 89/100 across 1,081 public water systems. Safety can vary by city and system, so check your local report for recent violations and contaminants.
How many water systems are in California?
WaterQ currently tracks 1,081 public water systems in California.
Where can I compare cities in California?
Use the city list below to open detailed reports, or visit the compare tool to benchmark two cities side-by-side on score, grade, and system coverage.