A96/100
NPS-ASH MOUNTAIN — Water Quality Report 2026
Serving 2,930 people · California
Water Source
Groundwater Under Influence of Surface Water
County
—
System ID
CA5410513
Violations
4
Contaminant Test Results
EPA Violation History
3
Violations (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
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, 2024 – July 15, 2025Rule: Ground Water RuleEnforcement: Formal — state order issued
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2022 – February 28, 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 NPS-ASH MOUNTAIN
Is NPS-ASH MOUNTAIN water safe to drink?
NPS-ASH MOUNTAIN water receives a grade of A (96/100), which is considered excellent. Out of 21 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has NPS-ASH MOUNTAIN detected?
21 contaminants were tested in NPS-ASH MOUNTAIN's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does NPS-ASH MOUNTAIN have any EPA violations?
Yes, NPS-ASH MOUNTAIN has 4 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, MR, Other.
How many people does NPS-ASH MOUNTAIN serve?
NPS-ASH MOUNTAIN serves approximately 2,930 people, California.
What type of water does NPS-ASH MOUNTAIN provide?
NPS-ASH MOUNTAIN sources its water from groundwater under influence of surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA5410513.
How does NPS-ASH MOUNTAIN compare to other utilities in California?
NPS-ASH MOUNTAIN scores 96/100 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.