States ›California ›Madera County ›Oakhurst

Oakhurst, CA Tap Water Quality 2026

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

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

Main Utility: Cal Am - Oakhurst PWSID: CA2010007 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 5.00 ppb, 33% of the action level and no violations are open. No PFAS was detected.

B

Oakhurst earns a B for water quality

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

Lead: 5.00 ppb — 33% of the federal action level
PFAS tested, none detected
34 violations since 2015, 34 health-based
No violations currently open
Oakhurst's lead level vs. all California community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 5.00 ppb — 33% of the federal action level
✓ Lower lead than 18% of California utilities
Population Served
3353
~1119 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
34 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
33% of EPA action level
5.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 5.00 ppb, 33% 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.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Arsenic MCL EXCEEDANCE 16 UG/L 0.010 mg/L 2019 Resolved
Combined Uranium MCL EXCEEDANCE 350 PCI/L 30 ug/L 2019 Resolved
Arsenic MCL EXCEEDANCE 17 UG/L 0.010 mg/L 2018 Resolved
Combined Uranium MCL EXCEEDANCE 173 PCI/L 30 ug/L 2018 Resolved
Arsenic MCL EXCEEDANCE 0.013 MG/L 0.010 mg/L 2018 Resolved
Combined Uranium MCL EXCEEDANCE 184 PCI/L 30 ug/L 2018 Resolved
Combined Uranium MCL EXCEEDANCE 300 PCI/L 30 ug/L 2018 Resolved
Arsenic MCL EXCEEDANCE 16 UG/L 0.010 mg/L 2018 Resolved
Combined Uranium MCL EXCEEDANCE 230 PCI/L 30 ug/L 2018 Resolved
Arsenic MCL EXCEEDANCE 15.5 UG/L 0.010 mg/L 2018 Resolved
Arsenic MCL EXCEEDANCE 17 UG/L 0.010 mg/L 2017 Resolved
Combined Uranium MCL EXCEEDANCE 160 PCI/L 30 ug/L 2017 Resolved
Arsenic MCL EXCEEDANCE 17 UG/L 0.010 mg/L 2017 Resolved
Combined Uranium MCL EXCEEDANCE 200 PCI/L 30 ug/L 2017 Resolved
Combined Uranium MCL EXCEEDANCE 190 PCI/L 30 ug/L 2017 Resolved
Arsenic MCL EXCEEDANCE 16 UG/L 0.010 mg/L 2017 Resolved
Arsenic MCL EXCEEDANCE 0.012 UG/L 0.010 mg/L 2017 Resolved
Combined Uranium MCL EXCEEDANCE 27 PCI/L 30 ug/L 2017 Resolved
Combined Uranium MCL EXCEEDANCE 54 PCI/L 30 ug/L 2016 Resolved
Arsenic MCL EXCEEDANCE 0.013 UG/L 0.010 mg/L 2016 Resolved
Combined Uranium MCL EXCEEDANCE 54 PCI/L 30 ug/L 2016 Resolved
Arsenic MCL EXCEEDANCE 0.012 MG/L 0.010 mg/L 2016 Resolved
Combined Uranium MCL EXCEEDANCE 187.5 PCI/L 30 ug/L 2016 Resolved
Arsenic MCL EXCEEDANCE 12.5 UG/L 0.010 mg/L 2016 Resolved
Arsenic MCL EXCEEDANCE 12.5 UG/L 0.010 mg/L 2016 Resolved
Combined Uranium MCL EXCEEDANCE 117 PCI/L 30 ug/L 2016 Resolved
Arsenic MCL EXCEEDANCE 0.046 MG/L 0.010 mg/L 2015 Resolved
Combined Uranium MCL EXCEEDANCE 85 PCI/L 30 ug/L 2015 Resolved
Arsenic MCL EXCEEDANCE 11 UG/L 0.010 mg/L 2015 Resolved
Combined Uranium MCL EXCEEDANCE 120.55 PCI/L 30 ug/L 2015 Resolved
Combined Uranium MCL EXCEEDANCE 77 PCI/L 30 ug/L 2015 Resolved
Arsenic MCL EXCEEDANCE 0.046 MG/L 0.010 mg/L 2015 Resolved
Combined Uranium MCL EXCEEDANCE 110 PCI/L 30 ug/L 2015 Resolved
Arsenic MCL EXCEEDANCE 0.046 MG/L 0.010 mg/L 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

34 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 Cal Am - Oakhurst
PWSID CA2010007
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 3,353
Service connections 1,119
Systems serving this area 11
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Oakhurst tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 5.00 ppb, 33% of the action level.
Does Oakhurst water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Oakhurst? ▼
Cal Am - Oakhurst (PWSID CA2010007), one of 11 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2021-05-13. No significant deficiencies were recorded.

What Should Oakhurst Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
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.

Nearby Cities in California

Madera, Ca Tap Water Quality 2026 Madera Chowchilla, Ca Tap Water Quality 2026 Madera Yosemite Lakes, Ca Tap Water Quality 2026 Madera Parksdale, Ca Tap Water Quality 2026 Madera Madera Ranchos, Ca Tap Water Quality 2026 Madera Parkwood, Ca Tap Water Quality 2026 Madera