D21/100
RIPON, CITY OF — Water Quality Report 2026
Serving 15,741 people · California
Water Source
Groundwater
County
—
System ID
CA3910007
Violations
20
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOS | 0.012 µg/L | 0.004 µg/L | Over Limit |
PFOA | 0.005 µg/L | 0.004 µg/L | Over Limit |
vanadium | 94.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2014.
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 RIPON, CITY OF
Is RIPON, CITY OF water safe to drink?
RIPON, CITY OF water receives a grade of D (21/100), which is considered poor. 2 contaminant(s) exceed EPA legal limits and 20 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has RIPON, CITY OF detected?
66 contaminants were tested in RIPON, CITY OF's water. Notable contaminants include PFOS, PFOA, vanadium. 2 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).
Does RIPON, CITY OF have any EPA violations?
Yes, RIPON, CITY OF has 20 EPA violation(s) on record, with the most recent in 2014. Violation types include MR, Other, MCL. 10 are health-based violations.
How many people does RIPON, CITY OF serve?
RIPON, CITY OF serves approximately 15,741 people, California. The system provides water to 1 community: Ripon.
What type of water does RIPON, CITY OF provide?
RIPON, CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA3910007.
How does RIPON, CITY OF compare to other utilities in California?
RIPON, CITY OF scores 21/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our California state page for a full comparison of water systems.