Water Quality in WATERLOO, IN (46793)

EPA violation data for public water systems serving ZIP code 46793.

118

Total Violations

Health-Based

Monitoring / Reporting

109

Resolved

What does this mean?

109 of 118 violations have been resolved. 57 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 61 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: 22 Population served: 7,112

Violations Detail (118 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Groundwater Rule	Health-Based	N/A	N/A	Aug 7, 2025	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 7, 2025	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 7, 2025	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 7, 2025	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 7, 2025	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 7, 2025	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 7, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2025	Resolved	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 24, 2025	Active	N/A
Groundwater Rule	Monitoring	N/A	N/A	Jul 24, 2025	Active	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2025	Active	N/A
Arsenic	Health-Based	N/A	0.011	Dec 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Dec 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Dec 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Dec 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Dec 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.011	Dec 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
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	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	Monitoring	N/A	N/A	Oct 16, 2024	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Oct 9, 2024	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Oct 9, 2024	Resolved	N/A
Arsenic	Health-Based	N/A	0.0155	Sep 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0155	Sep 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0155	Sep 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0155	Sep 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0155	Sep 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Arsenic	Health-Based	N/A	0.0155	Sep 30, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Aug 25, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Feb 9, 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	Dec 31, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
E. COLI	Monitoring	0	N/A	Dec 28, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 28, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 28, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Health-Based	N/A	N/A	Nov 19, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Nov 19, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Nov 19, 2023	Resolved	N/A
E. COLI	Monitoring	0	N/A	Oct 27, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Oct 27, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Oct 27, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Active	N/A
E. COLI	Monitoring	0	N/A	Dec 14, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 14, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 14, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Oct 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Oct 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Oct 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 26, 2021	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 26, 2021	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 26, 2021	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 26, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A

Lead & Copper Levels

Violation Timeline

2025(12)

Groundwater Rule

Aug 7Active

Groundwater Rule

Aug 7Active

Groundwater Rule

Aug 7Active

Groundwater Rule

Aug 7Active

Groundwater Rule

Aug 7Resolved

Groundwater Rule

Aug 7Resolved

Groundwater Rule

Aug 7Resolved

Revised Total Coliform Rule

Jul 31Resolved

Revised Total Coliform Rule

Jul 31Resolved

Groundwater Rule

Jul 24Active

Groundwater Rule

Jul 24Active

Consumer Confidence Rule

Jun 30Active

2024(46)

Arsenic

Dec 31Resolved

Arsenic

Dec 31Resolved

Arsenic

Dec 31Resolved

Arsenic

Dec 31Resolved

Arsenic

Dec 31Resolved

Arsenic

Dec 31Resolved