B71/100
CITY OF PLEASANTON — Water Quality Report 2026
Serving 76,689 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA0110008
Violations
2
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.70 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.022 mg/L | 0.015 mg/L | Over Limit |
chlorate | 850.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1995.
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 PLEASANTON
Is CITY OF PLEASANTON water safe to drink?
CITY OF PLEASANTON water receives a grade of B (71/100), which is considered good. Out of 70 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 PLEASANTON detected?
70 contaminants were tested in CITY OF PLEASANTON's water. Notable contaminants include Lead (90th percentile), Copper (90th percentile), chlorate. 2 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).
Does CITY OF PLEASANTON have any EPA violations?
Yes, CITY OF PLEASANTON has 2 EPA violation(s) on record, with the most recent in 1995. Violation types include MCL. 2 are health-based violations.
How many people does CITY OF PLEASANTON serve?
CITY OF PLEASANTON serves approximately 76,689 people, California. The system provides water to 1 community: Pleasanton.
What type of water does CITY OF PLEASANTON provide?
CITY OF PLEASANTON 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 CA0110008.
How does CITY OF PLEASANTON compare to other utilities in California?
CITY OF PLEASANTON scores 71/100 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.