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Mount Shasta, CA Tap Water Quality 2026

Water quality report for Mount Shasta, CA — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Mount Shasta's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Mt. Shasta, City Of PWSID: CA4710008 Updated: 2026 Q2
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1 violation currently open

Lead is 1.36 ppb, 9% of the action level. No PFAS was detected.

D

Mount Shasta earns a D for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 1.36 ppb — 9% of the federal action level
PFAS tested, none detected
10 violations since 2015, 9 health-based
1 violation currently open
Mount Shasta's lead level vs. all California community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 1.36 ppb — 9% of the federal action level
✓ Lower lead than 77% of California utilities
Population Served
3126
~1884 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
1
1 open of 10 since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
9% of EPA action level
1.36 ppb
Action level: 15 ppb
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
116.2% of EPA action level
1,510 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 1.36 ppb, 9% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Unaddressed
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Unaddressed
Revised Total Coliform Rule TREATMENT TECHNIQUE — — 2019 Resolved
Revised Total Coliform Rule MCL EXCEEDANCE — — 2017 Resolved
Revised Total Coliform Rule MCL EXCEEDANCE — — 2017 Resolved
Revised Total Coliform Rule MCL EXCEEDANCE — — 2017 Resolved
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 2016 Resolved
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 2015 Resolved
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 2015 Resolved
Coliform (TCR) MCL EXCEEDANCE — 5% of samples 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

1 violation remains open, out of 10 recorded since 2015 (9 health-based).

About the Main Water System

Utility Mt. Shasta, City Of
PWSID CA4710008
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 3,126
Service connections 1,884
Systems serving this area 3
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Mount Shasta tap water safe to drink? ▼
No federal limit is exceeded on record. 1 violation(s) remain open. Lead is 1.36 ppb, 9% of the action level.
Does Mount Shasta water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Mount Shasta? ▼
Mt. Shasta, City Of (PWSID CA4710008), one of 3 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-09-04. No significant deficiencies were recorded.

What Should Mount Shasta Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Follow the open violation
This system has an unresolved violation. Contact the supplier for its corrective-action schedule.

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