Water Quality in TONTO BASIN, AZ (85553)

EPA violation data for public water systems serving ZIP code 85553.

Total Violations

Health-Based

Monitoring / Reporting

Resolved

What does this mean?

50 of 57 violations have been resolved. 22 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 35 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.

Water systems: 8 Population served: 467

Violations Detail (57 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Chlorine	Monitoring	N/A	N/A	Jul 31, 2025	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 21, 2025	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 21, 2025	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 21, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 19, 2024	Active	N/A
Public Notice	Monitoring	N/A	N/A	Dec 19, 2024	Active	N/A
Public Notice	Monitoring	N/A	N/A	Dec 19, 2024	Active	N/A
LEAD AND COPPER RULE REVISIONS	Health-Based	N/A	N/A	Oct 16, 2024	Resolved	N/A
LEAD AND COPPER RULE REVISIONS	Health-Based	N/A	N/A	Oct 16, 2024	Resolved	N/A
LEAD AND COPPER RULE REVISIONS	Monitoring	N/A	N/A	Oct 16, 2024	Resolved	N/A
LEAD AND COPPER RULE REVISIONS	Monitoring	N/A	N/A	Oct 16, 2024	Resolved	N/A
LEAD AND COPPER RULE REVISIONS	Monitoring	N/A	N/A	Oct 16, 2024	Resolved	N/A
LEAD AND COPPER RULE REVISIONS	Health-Based	N/A	N/A	Oct 16, 2024	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Sep 13, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Sep 13, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Jul 27, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Jul 27, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Jul 27, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Jul 27, 2023	Resolved	N/A
E. COLI	Monitoring	0	N/A	Jul 12, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Jul 12, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Health-Based	N/A	N/A	Dec 16, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Dec 16, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Dec 16, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Dec 16, 2022	Resolved	N/A
E. COLI	Monitoring	0	N/A	Nov 30, 2022	Active	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Nov 30, 2022	Active	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Nov 30, 2022	Active	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Health-Based	N/A	N/A	Nov 21, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Nov 21, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Nov 21, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Nov 21, 2022	Resolved	N/A
E. COLI	Monitoring	0	N/A	Nov 4, 2022	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Nov 4, 2022	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Nov 4, 2022	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Nov 4, 2022	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 18, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 18, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 18, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 18, 2022	Resolved	N/A
E. COLI	Monitoring	0	N/A	Aug 29, 2022	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Public Notice	Monitoring	N/A	N/A	Feb 25, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 25, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 18, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 18, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 18, 2021	Active	N/A
Public Notice	Monitoring	N/A	N/A	Feb 18, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Feb 18, 2021	Resolved	N/A

Violation Timeline

2025(4)

Chlorine

Jul 31Resolved

Revised Total Coliform Rule

May 21Resolved

Revised Total Coliform Rule

May 21Resolved

Revised Total Coliform Rule

May 21Resolved

2024(9)

Public Notice

Dec 19Active

Public Notice

Dec 19Active

Public Notice

Dec 19Active