F0/100
MANTECA, CITY OF — Water Quality Report 2026
Serving 84,928 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA3910005
Violations
42
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFHxS | 0.018 µg/L | 0.010 µg/L | Over Limit |
PFOA | 0.007 µg/L | 0.004 µg/L | Over Limit |
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
Exceeded the MCL for disinfection byproducts
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2024 – December 31, 2024Enforcement: 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 MANTECA, CITY OF
Is MANTECA, CITY OF water safe to drink?
MANTECA, CITY OF water receives a grade of F (0/100), which is considered failing. 2 contaminant(s) exceed EPA legal limits and 42 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has MANTECA, CITY OF detected?
69 contaminants were tested in MANTECA, CITY OF's water. Notable contaminants include PFHxS, PFOA, Lead (90th percentile). 2 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).
Does MANTECA, CITY OF have any EPA violations?
Yes, MANTECA, CITY OF has 42 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, MCL, Other. 36 are health-based violations.
How many people does MANTECA, CITY OF serve?
MANTECA, CITY OF serves approximately 84,928 people, California. The system provides water to 1 community: Manteca.
What type of water does MANTECA, CITY OF provide?
MANTECA, CITY OF 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 CA3910005.
How does MANTECA, CITY OF compare to other utilities in California?
MANTECA, CITY OF scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our California state page for a full comparison of water systems.