B78/100
ATASCADERO STATE HOSPITAL — Water Quality Report 2026
Serving 4,100 people · California
Water Source
Groundwater
County
—
System ID
CA4010832
Violations
3
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.80 mg/L | 1.30 mg/L | Over Limit |
PFOS | 0.004 µg/L | 0.004 µg/L | Over Limit |
Lead (90th percentile) | 0.006 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (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: January 1, 2023 – December 31, 2023Enforcement: 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 ATASCADERO STATE HOSPITAL
Is ATASCADERO STATE HOSPITAL water safe to drink?
ATASCADERO STATE HOSPITAL water receives a grade of B (78/100), which is considered good. Out of 32 contaminants tested, 2 exceed EPA legal limits. 3 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has ATASCADERO STATE HOSPITAL detected?
32 contaminants were tested in ATASCADERO STATE HOSPITAL's water. Notable contaminants include Copper (90th percentile), PFOS, Lead (90th percentile). 2 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).
Does ATASCADERO STATE HOSPITAL have any EPA violations?
Yes, ATASCADERO STATE HOSPITAL has 3 EPA violation(s) on record, with the most recent in 2023. Violation types include MR.
How many people does ATASCADERO STATE HOSPITAL serve?
ATASCADERO STATE HOSPITAL serves approximately 4,100 people, California.
What type of water does ATASCADERO STATE HOSPITAL provide?
ATASCADERO STATE HOSPITAL sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is CA4010832.
How does ATASCADERO STATE HOSPITAL compare to other utilities in California?
ATASCADERO STATE HOSPITAL scores 78/100 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.