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Why, AZ Tap Water Quality 2026

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

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

Main Utility: Why Dwid PWSID: AZ0410118 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.

C

Why earns a C for water quality

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

Lead: not detected
PFAS never sampled at this system
66 violations since 2015, 11 health-based
No violations currently open
Why's lead level vs. all Arizona community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Arizona utilities
Population Served
106
~113 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
66 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
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
450.8% of EPA action level
5,860 ppb
Action level: 1,300 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. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Lead and Copper Rule MONITORING AND REPORTING — TT 2026 Unaddressed
Revised Total Coliform Rule REPORTING FAILURE — — 2024 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2024 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2024 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2024 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2023 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 Resolved
Consumer Confidence Rule OTHER — — 2022 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2022 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2022 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2022 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2022 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2021 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2021–2022 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2021–2022 Resolved
Consumer Confidence Rule OTHER — — 2021 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2021 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2020 Resolved
Arsenic MONITORING AND REPORTING — 0.010 mg/L 2019 Resolved
Consumer Confidence Rule OTHER — — 2019 Resolved
Arsenic MCL EXCEEDANCE 0.013 MG/L 0.010 mg/L 2018 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2018–2019 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2018–2019 Resolved
Arsenic MCL EXCEEDANCE 0.013 MG/L 0.010 mg/L 2018 Resolved
Revised Total Coliform Rule REPORTING FAILURE — — 2018 Resolved
Arsenic MCL EXCEEDANCE 0.02 MG/L 0.010 mg/L 2018 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2018 Resolved
Arsenic MCL EXCEEDANCE 0.02 MG/L 0.010 mg/L 2018 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2018 Resolved
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2018 Resolved
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2018 Resolved
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2018 Resolved
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2018 Resolved
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2018 Resolved
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2018 Resolved
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2018 Resolved
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2018 Resolved
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2018 Resolved
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2018 Resolved
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2018 Resolved
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2018 Resolved
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2018 Resolved
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2018 Resolved
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2018 Resolved
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2018 Resolved
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2018 Resolved
Benzene MONITORING AND REPORTING — 0.005 mg/L 2018 Resolved
Toluene MONITORING AND REPORTING — 1 mg/L 2018 Resolved
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2018 Resolved
Styrene MONITORING AND REPORTING — 0.1 mg/L 2018 Resolved
Lead and Copper Rule MONITORING AND REPORTING — TT 2017 Resolved
Arsenic MCL EXCEEDANCE 0.012 MG/L 0.010 mg/L 2017 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2017 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2017–2018 Resolved
Arsenic MCL EXCEEDANCE 0.011 MG/L 0.010 mg/L 2017 Resolved
E. COLI MONITORING AND REPORTING — 0 2017 Resolved
Arsenic MCL EXCEEDANCE 0.013 MG/L 0.010 mg/L 2017 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2017 Resolved
Arsenic MCL EXCEEDANCE 0.013 MG/L 0.010 mg/L 2017 Resolved
Arsenic MCL EXCEEDANCE 0.013 MG/L 0.010 mg/L 2016 Resolved
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2016 Resolved
Revised Total Coliform Rule MONITORING FAILURE — — 2016 Resolved
Arsenic MCL EXCEEDANCE 0.013 MG/L 0.010 mg/L 2016 Resolved
Arsenic MCL EXCEEDANCE 0.022 MG/L 0.010 mg/L 2016 Resolved
Coliform (TCR) MONITORING AND REPORTING — 5% of samples 2015 Resolved
Coliform (TCR) MONITORING AND REPORTING — 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

66 violations are on record since 2015, of which 11 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Why Dwid
PWSID AZ0410118
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 106
Service connections 113
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Why tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Why 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 Why? ▼
Why Dwid (PWSID AZ0410118). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2024-10-17. No significant deficiencies were recorded.

What Should Why 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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