A93/100
SAN DIEGUITO WD — Water Quality Report 2026
Serving 40,405 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA3710021
Violations
1
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 220.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2022 – July 12, 2023Rule: Ground Water RuleEnforcement: Formal — state order issued
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About SAN DIEGUITO WD
Is SAN DIEGUITO WD water safe to drink?
SAN DIEGUITO WD water receives a grade of A (93/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has SAN DIEGUITO WD detected?
69 contaminants were tested in SAN DIEGUITO WD's water. Notable contaminants include Lead (90th percentile), chlorate. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does SAN DIEGUITO WD have any EPA violations?
Yes, SAN DIEGUITO WD has 1 EPA violation(s) on record, with the most recent in 2022. Violation types include MR.
How many people does SAN DIEGUITO WD serve?
SAN DIEGUITO WD serves approximately 40,405 people, California.
What type of water does SAN DIEGUITO WD provide?
SAN DIEGUITO WD sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA3710021.
How does SAN DIEGUITO WD compare to other utilities in California?
SAN DIEGUITO WD scores 93/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our California state page for a full comparison of water systems.