B69/100
OAKDALE, CITY OF — Water Quality Report 2026
Serving 23,235 people · California
Water Source
Groundwater
County
—
System ID
CA5010014
Violations
11
Contaminant Test Results
EPA Violation History
2
Violations (last 5yr)
2
Unresolved
1
Health-Related
TIER 3Unresolved
Reporting violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 2Unresolved
Treatment technique violation
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 OAKDALE, CITY OF
Is OAKDALE, CITY OF water safe to drink?
OAKDALE, CITY OF water receives a grade of B (69/100), which is considered good. Out of 66 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has OAKDALE, CITY OF detected?
66 contaminants were tested in OAKDALE, CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does OAKDALE, CITY OF have any EPA violations?
Yes, OAKDALE, CITY OF has 11 EPA violation(s) on record, with the most recent in 2024. Violation types include RPT, TT, MCL. 5 are health-based violations.
How many people does OAKDALE, CITY OF serve?
OAKDALE, CITY OF serves approximately 23,235 people, California. The system provides water to 1 community: Oakdale.
What type of water does OAKDALE, CITY OF provide?
OAKDALE, CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA5010014.
How does OAKDALE, CITY OF compare to other utilities in California?
OAKDALE, CITY OF scores 69/100 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.