A90/100
MCKINLEYVILLE C.S.D. — Water Quality Report 2026
Serving 16,900 people · California
Water Source
Purchased Groundwater
County
—
System ID
CA1210016
Violations
3
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2022 – June 20, 2023Rule: Ground Water 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 MCKINLEYVILLE C.S.D.
Is MCKINLEYVILLE C.S.D. water safe to drink?
MCKINLEYVILLE C.S.D. water receives a grade of A (90/100), which is considered excellent. Out of 66 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has MCKINLEYVILLE C.S.D. detected?
66 contaminants were tested in MCKINLEYVILLE C.S.D.'s water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does MCKINLEYVILLE C.S.D. have any EPA violations?
Yes, MCKINLEYVILLE C.S.D. has 3 EPA violation(s) on record, with the most recent in 2022. Violation types include MR, TT, Other. 1 are health-based violations.
How many people does MCKINLEYVILLE C.S.D. serve?
MCKINLEYVILLE C.S.D. serves approximately 16,900 people, California.
What type of water does MCKINLEYVILLE C.S.D. provide?
MCKINLEYVILLE C.S.D. sources its water from purchased groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA1210016.
How does MCKINLEYVILLE C.S.D. compare to other utilities in California?
MCKINLEYVILLE C.S.D. scores 90/100 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.