A100/100
MARIN MUNICIPAL WATER DISTRICT — Water Quality Report 2026
Serving 186,895 people · California
Water Source
Surface Water
County
—
System ID
CA2110002
Violations
0
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 420.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
This system has a clean compliance history.
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 MARIN MUNICIPAL WATER DISTRICT
Is MARIN MUNICIPAL WATER DISTRICT water safe to drink?
MARIN MUNICIPAL WATER DISTRICT water receives a grade of A (100/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has MARIN MUNICIPAL WATER DISTRICT detected?
76 contaminants were tested in MARIN MUNICIPAL WATER DISTRICT's water. Notable contaminants include chlorate. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does MARIN MUNICIPAL WATER DISTRICT have any EPA violations?
No, MARIN MUNICIPAL WATER DISTRICT has zero EPA violations on record. This indicates consistent compliance with federal drinking water standards.
How many people does MARIN MUNICIPAL WATER DISTRICT serve?
MARIN MUNICIPAL WATER DISTRICT serves approximately 186,895 people, California.
What type of water does MARIN MUNICIPAL WATER DISTRICT provide?
MARIN MUNICIPAL WATER DISTRICT sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA2110002.
How does MARIN MUNICIPAL WATER DISTRICT compare to other utilities in California?
MARIN MUNICIPAL WATER DISTRICT scores 100/100 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.