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Three Rivers, CA Tap Water Quality 2026

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

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

Main Utility: South Kaweah Mutual Water Company PWSID: CA5400754 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. PFAS has never been sampled at this system.

B

Three Rivers earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: not detected
PFAS never sampled at this system
16 violations since 2015, 12 health-based
No violations currently open
Three Rivers's lead level vs. all California community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of California utilities
Population Served
279
~142 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
16 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Arsenic MCL EXCEEDANCE 0.0135 MG/L 0.010 mg/L 2026 Archived
Consumer Confidence Rule OTHER — — 2025 Resolved
Arsenic MCL EXCEEDANCE 0.013 MG/L 0.010 mg/L 2025 Archived
Arsenic MCL EXCEEDANCE 0.0128 MG/L 0.010 mg/L 2025 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Resolved
Arsenic MCL EXCEEDANCE 0.01375 MG/L 0.010 mg/L 2025 Archived
Arsenic MCL EXCEEDANCE 0.0135 MG/L 0.010 mg/L 2025 Archived
Arsenic MCL EXCEEDANCE 0.0118 MG/L 0.010 mg/L 2024 Archived
Arsenic MCL EXCEEDANCE 0.0108 MG/L 0.010 mg/L 2024 Archived
Consumer Confidence Rule OTHER — — 2024 Addressed
Arsenic MCL EXCEEDANCE 0.0102 MG/L 0.010 mg/L 2023 Archived
Arsenic MCL EXCEEDANCE 0.0105 MG/L 0.010 mg/L 2023 Archived
Arsenic MCL EXCEEDANCE 0.0108 MG/L 0.010 mg/L 2023 Archived
Arsenic MCL EXCEEDANCE 0.0108 MG/L 0.010 mg/L 2022 Archived
Arsenic MCL EXCEEDANCE 0.0108 MG/L 0.010 mg/L 2022 Archived
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

16 violations are on record since 2015, of which 12 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility South Kaweah Mutual Water Company
PWSID CA5400754
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 279
Service connections 142
Systems serving this area 10
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Three Rivers tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Three Rivers water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Three Rivers? ▼
South Kaweah Mutual Water Company (PWSID CA5400754), one of 10 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2023-05-01. No significant deficiencies were recorded.

What Should Three Rivers 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
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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