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Darwin, CA Tap Water Quality 2026

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

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

Main Utility: Darwin Community Service District PWSID: CA1400098 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

Darwin 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
8 violations since 2015, 3 health-based
No violations currently open
Darwin'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
33
~63 connections
Water Source
Surface water
Groundwater under the direct influence of surface water — SDWIS source code GU
Active Violations
0
8 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
Lead and Copper Rule MONITORING AND REPORTING — TT 2024 Unaddressed
TTHM MCL EXCEEDANCE 0.087 MG/L 0.080 mg/L 2021 Resolved
TTHM MCL EXCEEDANCE 0.087 MG/L 0.080 mg/L 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2020 Resolved
Surface Water Treatment Rule TREATMENT TECHNIQUE — — 2019 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2019 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2018 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 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

8 violations are on record since 2015, of which 3 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Darwin Community Service District
PWSID CA1400098
Water source Surface water — Groundwater under the direct influence of surface water — SDWIS source code GU
Population served 33
Service connections 63
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Darwin tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Darwin 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 Darwin? ▼
Darwin Community Service District (PWSID CA1400098). Surface water. Groundwater under the direct influence of surface water — SDWIS source code GU
When was this system last inspected? ▼
It was last inspected on 2024-12-30. No significant deficiencies were recorded.

What Should Darwin 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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