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Dos Palos, CA Tap Water Quality 2026

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

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

Main Utility: City Of Dos Palos PWSID: CA2410002 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. No PFAS was detected.

B

Dos Palos earns a B for water quality

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

Lead: not detected
PFAS tested, none detected
35 violations since 2015, 34 health-based
No violations currently open
Dos Palos'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
5443
~2525 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
35 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
TTHM MCL EXCEEDANCE 0.0892 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.0878 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.0931 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.0984 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.1036 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.084 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.107 MG/L 0.080 mg/L 2023 Archived
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 Addressed
TTHM MCL EXCEEDANCE 104.5 UG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 143 UG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 120 UG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 108 UG/L 0.080 mg/L 2021 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 98 UG/L 0.060 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 106 UG/L 0.080 mg/L 2020 Archived
CARBON, TOTAL TREATMENT TECHNIQUE — TT 2020 Archived
TTHM MCL EXCEEDANCE 93.4 UG/L 0.080 mg/L 2020 Archived
CARBON, TOTAL TREATMENT TECHNIQUE — TT 2020 Archived
TTHM MCL EXCEEDANCE 0.091 MG/L 0.080 mg/L 2020 Archived
CARBON, TOTAL TREATMENT TECHNIQUE — TT 2020 Archived
TTHM MCL EXCEEDANCE 0.11 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.089 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.105 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.104 MG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.094 MG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 97 UG/L 0.080 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 0.122 MG/L 0.080 mg/L 2017 Archived
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2017 Resolved
TTHM MCL EXCEEDANCE 125 UG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 132 UG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 150 UG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 147 UG/L 0.080 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 145 UG/L 0.080 mg/L 2015 Archived
TTHM MCL EXCEEDANCE 135 UG/L 0.080 mg/L 2015 Archived
TTHM MCL EXCEEDANCE 140 MG/L 0.080 mg/L 2015 Archived
TTHM MCL EXCEEDANCE 135 UG/L 0.080 mg/L 2015 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

35 violations are on record since 2015, of which 34 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility City Of Dos Palos
PWSID CA2410002
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 5,443
Service connections 2,525
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Dos Palos tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Dos Palos water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Dos Palos? ▼
City Of Dos Palos (PWSID CA2410002). Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2026-03-17. No significant deficiencies were recorded.

What Should Dos Palos 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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