B70/100
Yocha Dehe Potable Water System — Water Quality Report 2026
Serving 12,800 people · California
Water Source
Groundwater
County
—
System ID
090605107
Violations
8
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.60 mg/L | 1.30 mg/L | Over Limit |
chlorate | 420.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.005 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Exceeded the MCL for disinfection byproducts
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2023 – September 30, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved
Exceeded the MCL for disinfection byproducts
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2023 – September 30, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved
Exceeded the MCL for disinfection byproducts
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2023 – September 30, 2023Enforcement: Resolving — corrective action underway
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 Yocha Dehe Potable Water System
Is Yocha Dehe Potable Water System water safe to drink?
Yocha Dehe Potable Water System water receives a grade of B (70/100), which is considered good. Out of 47 contaminants tested, 1 exceed EPA legal limits. 3 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has Yocha Dehe Potable Water System detected?
47 contaminants were tested in Yocha Dehe Potable Water System's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile), chlorate. 1 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).
Does Yocha Dehe Potable Water System have any EPA violations?
Yes, Yocha Dehe Potable Water System has 8 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, MCL. 2 are health-based violations.
How many people does Yocha Dehe Potable Water System serve?
Yocha Dehe Potable Water System serves approximately 12,800 people, California.
What type of water does Yocha Dehe Potable Water System provide?
Yocha Dehe Potable Water System sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is 090605107.
How does Yocha Dehe Potable Water System compare to other utilities in California?
Yocha Dehe Potable Water System scores 70/100 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.