A88/100
MESA WATER DISTRICT — Water Quality Report 2026
Serving 110,000 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA3010004
Violations
2
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 258.00 µg/L | — | Above Goal |
1,4-dioxane | 4.06 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2010.
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 MESA WATER DISTRICT
Is MESA WATER DISTRICT water safe to drink?
MESA WATER DISTRICT water receives a grade of A (88/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has MESA WATER DISTRICT detected?
76 contaminants were tested in MESA WATER DISTRICT's water. Notable contaminants include chlorate, 1,4-dioxane. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does MESA WATER DISTRICT have any EPA violations?
Yes, MESA WATER DISTRICT has 2 EPA violation(s) on record, with the most recent in 2010. Violation types include MR, MCL. 1 are health-based violations.
How many people does MESA WATER DISTRICT serve?
MESA WATER DISTRICT serves approximately 110,000 people, California.
What type of water does MESA WATER DISTRICT provide?
MESA WATER DISTRICT 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 CA3010004.
How does MESA WATER DISTRICT compare to other utilities in California?
MESA WATER DISTRICT scores 88/100 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.