States ›Arizona ›Santa Cruz County ›Sonoita

Sonoita, AZ Tap Water Quality 2026

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

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

Main Utility: Sonoita Valley (south) Water Company PWSID: AZ0412005 Updated: 2026 Q2
🚨

1 violation currently open

Lead is 8.00 ppb, 53% of the action level. PFAS has never been sampled at this system.

D

Sonoita earns a D for water quality

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

Lead: 8.00 ppb — 53% of the federal action level
PFAS never sampled at this system
28 violations since 2015, 2 health-based
1 violation currently open
Sonoita's lead level vs. all Arizona community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 8.00 ppb — 53% of the federal action level
✓ Lower lead than 9% of Arizona utilities
Population Served
163
~59 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
1
1 open of 28 since 2015

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
53% of EPA action level
8.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 8.00 ppb, 53% 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
Public Notice OTHER — — 2025 Unaddressed
Public Notice OTHER — — 2024 Unaddressed
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Resolved
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Resolved
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2024 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2024 Resolved
Public Notice OTHER — — 2024 Resolved
Public Notice OTHER — — 2024 Resolved
Public Notice OTHER — — 2023 Resolved
Public Notice OTHER — — 2023 Resolved
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2023 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2023 Resolved
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2022 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2022 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2022 Resolved
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2022 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2021 Resolved
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2021 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2021 Resolved
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2021 Resolved
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2020 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2020 Resolved
Revised Total Coliform Rule TREATMENT TECHNIQUE — — 2019 Unaddressed
Consumer Confidence Rule OTHER — — 2019 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2019 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2019 Resolved
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2018 Resolved
Chlorine MONITORING AND REPORTING — 4.0 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

1 violation remains open, out of 28 recorded since 2015 (2 health-based).

About the Main Water System

Utility Sonoita Valley (South) Water Company
PWSID AZ0412005
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 163
Service connections 59
Systems serving this area 3
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Sonoita tap water safe to drink? ▼
No federal limit is exceeded on record. 1 violation(s) remain open. Lead is 8.00 ppb, 53% of the action level.
Does Sonoita 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 Sonoita? ▼
Sonoita Valley (South) Water Company (PWSID AZ0412005), one of 3 systems serving this area. Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2023-11-08. No significant deficiencies were recorded.

What Should Sonoita 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
Follow the open violation
This system has an unresolved violation. Contact the supplier for its corrective-action schedule.

Nearby Cities in Arizona

Rio Rico, Az Tap Water Quality 2026 Santa Cruz Nogales, Az Tap Water Quality 2026 Santa Cruz Tubac, Az Tap Water Quality 2026 Santa Cruz Patagonia, Az Tap Water Quality 2026 Santa Cruz Tumacacori-Carmen, Az Tap Water Quality 2026 Santa Cruz Kino Springs, Az Tap Water Quality 2026 Santa Cruz