States ›Arizona ›Yavapai County ›Cornville

Cornville, AZ Tap Water Quality 2026

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

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

Main Utility: Cs Oak Creek Public Service Llc PWSID: AZ0413042 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 10.00 ppb, 67% of the action level and no violations are open. PFAS has never been sampled at this system.

B

Cornville earns a B for water quality

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

Lead: 10.00 ppb — 67% of the federal action level
PFAS never sampled at this system
40 violations since 2015, 0 health-based
No violations currently open
Cornville's lead level vs. all Arizona community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 10.00 ppb — 67% of the federal action level
✓ Lower lead than 6% of Arizona utilities
Population Served
768
~260 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
40 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
67% of EPA action level
10.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 10.00 ppb, 67% 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 MONITORING AND REPORTING — 0.010 mg/L 2025 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2024 Resolved
Consumer Confidence Rule OTHER — — 2023 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2023 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2023 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2023 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2023 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2021 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2020 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2018–2019 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2018–2019 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2018 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2017 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2017 Resolved
Consumer Confidence Rule OTHER — — 2017 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2017 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2017 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2017 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2017 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2016 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2016 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2016 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2016 Resolved
Consumer Confidence Rule OTHER — — 2015 Resolved
Consumer Confidence Rule OTHER — — 2015 Resolved
E. COLI MONITORING AND REPORTING — 0 2015 Resolved
Coliform (TCR) MONITORING AND REPORTING — 5% of samples 2015 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2015 Resolved
CYANIDE MONITORING AND REPORTING — 0.2 mg/L 2015–2017 Resolved
Antimony, Total MONITORING AND REPORTING — 0.006 mg/L 2015–2017 Resolved
Cadmium MONITORING AND REPORTING — 0.005 mg/L 2015–2017 Resolved
Fluoride MONITORING AND REPORTING — 4.0 mg/L 2015–2017 Resolved
Chromium MONITORING AND REPORTING — 0.1 mg/L 2015–2017 Resolved
Thallium, Total MONITORING AND REPORTING — 0.002 mg/L 2015–2017 Resolved
Beryllium, Total MONITORING AND REPORTING — 0.004 mg/L 2015–2017 Resolved
Nickel MONITORING AND REPORTING — — 2015–2017 Resolved
Selenium MONITORING AND REPORTING — 0.05 mg/L 2015–2017 Resolved
Mercury MONITORING AND REPORTING — 0.002 mg/L 2015–2017 Resolved
Barium MONITORING AND REPORTING — 2 mg/L 2015–2017 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

40 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Cs Oak Creek Public Service Llc
PWSID AZ0413042
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 768
Service connections 260
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Cornville tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 10.00 ppb, 67% of the action level.
Does Cornville 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 Cornville? ▼
Cs Oak Creek Public Service Llc (PWSID AZ0413042), one of 2 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2023-12-19. No significant deficiencies were recorded.

What Should Cornville 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 Arizona

Prescott, Az Tap Water Quality 2026 Yavapai Prescott Valley, Az Tap Water Quality 2026 Yavapai Cottonwood, Az Tap Water Quality 2026 Yavapai Sedona, Az Tap Water Quality 2026 Yavapai Camp Verde, Az Tap Water Quality 2026 Yavapai Village of Oak Creek (Big Park), Az Tap Water Quality 2026 Yavapai