C52/100
EXETER, CITY OF — Water Quality Report 2026
Serving 11,169 people · California
Water Source
Groundwater
County
—
System ID
CA5410003
Violations
17
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Formal — state order issued
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Formal — state order issued
TIER 1 — URGENTResolved
Exceeded the Maximum Contaminant Level (single sample)
When: April 1, 2022 – June 30, 2022Enforcement: 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 EXETER, CITY OF
Is EXETER, CITY OF water safe to drink?
EXETER, CITY OF water receives a grade of C (52/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 17 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has EXETER, CITY OF detected?
42 contaminants were tested in EXETER, CITY OF's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does EXETER, CITY OF have any EPA violations?
Yes, EXETER, CITY OF has 17 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, MCL, MON. 7 are health-based violations.
How many people does EXETER, CITY OF serve?
EXETER, CITY OF serves approximately 11,169 people, California. The system provides water to 1 community: Exeter.
What type of water does EXETER, CITY OF provide?
EXETER, CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA5410003.
How does EXETER, CITY OF compare to other utilities in California?
EXETER, CITY OF scores 52/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our California state page for a full comparison of water systems.