A87/100
CITY OF MILPITAS — Water Quality Report 2026
Serving 81,773 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA4310005
Violations
5
Contaminant Test Results
EPA Violation History
2
Violations (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 – May 31, 2025Rule: Total Coliform RuleEnforcement: Formal — state order issuedVerify on EPA.gov
TIER 3Resolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: February 1, 2023 – February 28, 2023Rule: Total Coliform RuleEnforcement: Formal — state order issued
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 MILPITAS
Is CITY OF MILPITAS water safe to drink?
CITY OF MILPITAS water receives a grade of A (87/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has CITY OF MILPITAS detected?
69 contaminants were tested in CITY OF MILPITAS's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does CITY OF MILPITAS have any EPA violations?
Yes, CITY OF MILPITAS has 5 EPA violation(s) on record, with the most recent in 2025. Violation types include MON, MR, TT. 2 are health-based violations.
How many people does CITY OF MILPITAS serve?
CITY OF MILPITAS serves approximately 81,773 people, California. The system provides water to 1 community: Milpitas.
What type of water does CITY OF MILPITAS provide?
CITY OF MILPITAS 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 CA4310005.
How does CITY OF MILPITAS compare to other utilities in California?
CITY OF MILPITAS scores 87/100 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.