A85/100
MID-PENINSULA WATER DISTRICT — Water Quality Report 2026
Serving 30,609 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA4110001
Violations
3
Contaminant Test Results
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2015.
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 MID-PENINSULA WATER DISTRICT
Is MID-PENINSULA WATER DISTRICT water safe to drink?
MID-PENINSULA WATER DISTRICT water receives a grade of A (85/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has MID-PENINSULA WATER DISTRICT detected?
69 contaminants were tested in MID-PENINSULA WATER DISTRICT's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does MID-PENINSULA WATER DISTRICT have any EPA violations?
Yes, MID-PENINSULA WATER DISTRICT has 3 EPA violation(s) on record, with the most recent in 2015. Violation types include TT, MCL. 3 are health-based violations.
How many people does MID-PENINSULA WATER DISTRICT serve?
MID-PENINSULA WATER DISTRICT serves approximately 30,609 people, California.
What type of water does MID-PENINSULA WATER DISTRICT provide?
MID-PENINSULA 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 CA4110001.
How does MID-PENINSULA WATER DISTRICT compare to other utilities in California?
MID-PENINSULA WATER DISTRICT scores 85/100 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.