Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory
California Drinking Water Quality & Testing Directory
Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 2,630 ZIP codes across California
Quick Summary: Is Tap Water Safe in California?
Drinking water in California receives an average composite safety score of 72.8/100 based on EPA Safe Drinking Water Act records. Approximately 15% of monitored ZIP codes earn an "A" grade. Water sources are 71.7% surface water and 28.299999999999997% groundwater, resulting in Moderately Soft to Moderate mineral hardness across the state.
Total ZIP Codes
2,630
Health Violations (5yr)
3,328
Statewide Avg Score
72.8/100
High Lead Risk Areas
45.3%
Overview: Drinking Water in California
Drinking water quality in California averages a composite safety score of 72.8/100 across its 2,630 monitored ZIP codes. Approximately 15% of ZIP codes in the state receive an "A" grade, while 1% receive an "F" grade. Environmental standards are enforced by California State Water Resources Control Board.
Surface Water
71.7%
of ZIP codes
Total Violations
7,292
5-year record
Grade A ZIPs
386
15% of state
Grade F ZIPs
21
1% of state
Water Quality Grade Distribution in California
How do California's 2,630 ZIP codes stack up by water quality grade?
A
386 ZIP codes15%
B
1,274 ZIP codes48%
C
649 ZIP codes25%
D
300 ZIP codes11%
F
21 ZIP codes1%
Popular Cities in California
Click any city to view ZIP code-level water quality reports
Sacramento
102 ZIPs
B
Los Angeles
95 ZIPs
B
San Diego
81 ZIPs
C
San Francisco
60 ZIPs
C
Fresno
58 ZIPs
B
San Jose
57 ZIPs
B
Long Beach
27 ZIPs
B
Pasadena
26 ZIPs
B
Oakland
26 ZIPs
B
Bakersfield
24 ZIPs
B
Stockton
20 ZIPs
B
San Bernardino
18 ZIPs
B
Riverside
17 ZIPs
B
Anaheim
17 ZIPs
A
Santa Barbara
17 ZIPs
C
Inglewood
14 ZIPs
B
Glendale
14 ZIPs
B
Irvine
14 ZIPs
A
Burbank
13 ZIPs
B
Van Nuys
13 ZIPs
D
Santa Ana
12 ZIPs
B
Santa Monica
11 ZIPs
B
Whittier
11 ZIPs
B
North Hollywood
11 ZIPs
C
Orange
11 ZIPs
A
Berkeley
11 ZIPs
C
Torrance
10 ZIPs
B
Modesto
10 ZIPs
A
Chula Vista
8 ZIPs
A
Fullerton
8 ZIPs
A
Ventura
8 ZIPs
C
San Luis Obispo
8 ZIPs
B
Salinas
8 ZIPs
B
Concord
8 ZIPs
B
Santa Rosa
8 ZIPs
A
South Lake Tahoe
8 ZIPs
B
Alhambra
7 ZIPs
B
Escondido
7 ZIPs
A
Oceanside
7 ZIPs
B
Moreno Valley
7 ZIPs
B
City A-Z Directory — California
Browse water quality reports for every town and city in California.
🏆 Highest Rated ZIP Codes in California
⚠ Lowest Rated ZIP Codes in California
Common Drinking Water Contaminants in California
The following are common regulated contaminants found in California drinking water based on EPA violation records. Click any contaminant to learn about EPA safety limits and health effects.
Stage 2 DBP RuleConsumer Confidence Report RuleE. coliHaloacetic Acids (HAA5)LeadContaminant 0700Total Trihalomethanes (TTHM)Barium
Source: EPA Safe Drinking Water Act Maximum Contaminant Level regulations. For the complete list of regulated contaminants and MCLs, see the Water Quality Safety Guide.
Frequently Asked Questions — California Drinking Water
Is tap water generally safe to drink in California?+
Yes, for the majority of residents, tap water in California is treated and regulated. However, compliance varies by city. State-wide, 386 ZIP codes receive an "A" grade, while 21 receive an "F". Search your specific ZIP code to see your local utility's record.
How do I test water quality or well water in California?+
Residents in California can test their tap or well water by contacting laboratories certified by California State Water Resources Control Board or ordering an EPA-standard laboratory water testing kit. Annual testing is recommended for private wells to test for bacteria, nitrates, and heavy metals.
What are the biggest water quality issues in California?+
The primary issues include managing 3,328 health-based violations state-wide and resolving infrastructure age. 45.3% of ZIP codes in the state have a high probability of lead exposure risk due to pre-1986 piping.
Who regulates and enforces drinking water standards in California?+
Drinking water in California is regulated by California State Water Resources Control Board under a primacy agreement with the U.S. EPA.
Where does California get its drinking water?+
Approximately 71.7% of monitored areas in California rely on surface water sources (lakes/rivers), while the rest use groundwater aquifers.
How do I find the official water quality report for my home in California?+
Search your ZIP code on our site to view data compiled from EPA records, or contact your local utility for their annual Consumer Confidence Report (CCR).
View All 2,630 ZIP Codes in California
Browse EPA water quality data for every monitored ZIP code. For faster results, use the search bar above.
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All 2,630 ZIP codes in California are actively monitored under the EPA Safe Drinking Water Act.