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Dinuba, CA Tap Water Quality 2026

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

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

Main Utility: Dinuba, City Of PWSID: CA5410002 Updated: 2026 Q2
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1 violation currently open

Lead was not detected. No PFAS was detected.

C

Dinuba earns a C for water quality

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

Lead: not detected
PFAS tested, none detected
3 violations since 2015, 2 health-based
1 violation currently open
Dinuba'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
24330
~6621 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
1
1 open of 3 since 2015

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 REVISIONS TREATMENT TECHNIQUE — — 2024 Unaddressed
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Unaddressed
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 3 recorded since 2015 (2 health-based).

About the Main Water System

Utility Dinuba, City Of
PWSID CA5410002
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 24,330
Service connections 6,621
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Dinuba tap water safe to drink? ▼
No federal limit is exceeded on record. 1 violation(s) remain open.
Does Dinuba water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Dinuba? ▼
Dinuba, City Of (PWSID CA5410002). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-07-03. No significant deficiencies were recorded.

What Should Dinuba 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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