B74/100
CITY OF ARROYO GRANDE UTILITIES DIVISION — Water Quality Report 2026
Serving 17,963 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA4010001
Violations
3
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOS | 0.006 µg/L | 0.004 µg/L | Over Limit |
PFOA | 0.005 µg/L | 0.004 µg/L | Over Limit |
chlorate | 800.00 µg/L | — | Above Goal |
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: May 1, 2025 – June 30, 2025Rule: Total Coliform RuleEnforcement: Formal — state order issuedVerify on EPA.gov
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 CITY OF ARROYO GRANDE UTILITIES DIVISION
Is CITY OF ARROYO GRANDE UTILITIES DIVISION water safe to drink?
CITY OF ARROYO GRANDE UTILITIES DIVISION water receives a grade of B (74/100), which is considered good. Out of 69 contaminants tested, 2 exceed EPA legal limits. 3 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CITY OF ARROYO GRANDE UTILITIES DIVISION detected?
69 contaminants were tested in CITY OF ARROYO GRANDE UTILITIES DIVISION's water. Notable contaminants include PFOS, PFOA, chlorate. 2 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).
Does CITY OF ARROYO GRANDE UTILITIES DIVISION have any EPA violations?
Yes, CITY OF ARROYO GRANDE UTILITIES DIVISION has 3 EPA violation(s) on record, with the most recent in 2025. Violation types include MON, MR, MCL. 1 are health-based violations.
How many people does CITY OF ARROYO GRANDE UTILITIES DIVISION serve?
CITY OF ARROYO GRANDE UTILITIES DIVISION serves approximately 17,963 people, California.
What type of water does CITY OF ARROYO GRANDE UTILITIES DIVISION provide?
CITY OF ARROYO GRANDE UTILITIES DIVISION 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 CA4010001.
How does CITY OF ARROYO GRANDE UTILITIES DIVISION compare to other utilities in California?
CITY OF ARROYO GRANDE UTILITIES DIVISION scores 74/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our California state page for a full comparison of water systems.