Water Quality in WILTON, CT (06897)

EPA violation data for public water systems serving ZIP code 06897.

148

Total Violations

Health-Based

123

Monitoring / Reporting

144

Resolved

What does this mean?

144 of 148 violations have been resolved. 25 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 123 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: 71 Population served: 44,286

Violations Detail (148 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Public Notice	Monitoring	N/A	N/A	Sep 18, 2025	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Aug 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Jul 14, 2025	Active	N/A
Public Notice	Monitoring	N/A	N/A	May 10, 2025	Active	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2024	Resolved	N/A
Nitrate	Health-Based	N/A	16	Dec 31, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Health-Based	N/A	16	Dec 31, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Health-Based	N/A	16	Dec 31, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Health-Based	N/A	16	Dec 31, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Public Notice	Monitoring	N/A	N/A	Dec 12, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 12, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 12, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 12, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 8, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 8, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 7, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 7, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 7, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 7, 2024	Resolved	N/A
LEAD AND COPPER RULE REVISIONS	Monitoring	N/A	N/A	Oct 16, 2024	Active	N/A
LEAD AND COPPER RULE REVISIONS	Health-Based	N/A	N/A	Oct 16, 2024	Active	N/A
Public Notice	Monitoring	N/A	N/A	Sep 11, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Sep 11, 2024	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Aug 9, 2024	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Aug 9, 2024	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 1, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 1, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 1, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 1, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Nov 17, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Nov 17, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Nov 17, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Nov 17, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Aug 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 11, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 11, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 11, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 11, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 8, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 8, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
E. COLI	Monitoring	0	N/A	Mar 31, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Mar 31, 2023	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
E. COLI	Monitoring	0	N/A	Dec 31, 2022	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 31, 2022	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
E. COLI	Monitoring	0	N/A	Dec 31, 2022	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 31, 2022	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 15, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 15, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 15, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Apr 15, 2022	Resolved	N/A
o-Dichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Trichloroethylene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Liver problems; increased risk of cancer
Trichloroethylene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Liver problems; increased risk of cancer
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Tetrachloroethylene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Liver problems; increased risk of cancer
Tetrachloroethylene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Liver problems; increased risk of cancer
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Carbon tetrachloride	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Liver problems; increased risk of cancer
Carbon tetrachloride	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Liver problems; increased risk of cancer
1,2-Dichloroethane	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
1,2-Dichloroethane	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
DICHLOROMETHANE	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
DICHLOROMETHANE	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
o-Dichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
p-Dichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
p-Dichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
1,1-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
1,1-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Toluene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Toluene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Ethylbenzene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Ethylbenzene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Styrene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Styrene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Benzene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Vinyl chloride	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Increased risk of cancer
Vinyl chloride	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Increased risk of cancer
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Benzene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
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
E. COLI	Monitoring	0	N/A	Mar 31, 2022	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Mar 31, 2022	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2021	Resolved	N/A

Lead & Copper Levels

Violation Timeline

2025(6)

Public Notice

Sep 18Resolved

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Jul 14Active

Public Notice

May 10Active

2024(35)

Revised Total Coliform Rule

Dec 31Resolved

Nitrate

Dec 31Resolved

Nitrate

Dec 31Resolved

Nitrate

Dec 31Resolved

Nitrate

Dec 31Resolved

Public Notice

Dec 12Resolved

Public Notice

Dec 12Resolved

Public Notice

Dec 12Resolved

Public Notice

Dec 12Resolved

Public Notice

Dec 8Resolved

Public Notice

Dec 8Resolved

Public Notice

Dec 7Resolved

Public Notice

Dec 7Resolved

Public Notice

Dec 7Resolved

Public Notice

Dec 7Resolved

LEAD AND COPPER RULE REVISIONS

Oct 16Active

LEAD AND COPPER RULE REVISIONS

Oct 16Active

Public Notice

Sep 11Resolved

Public Notice

Sep 11Resolved

Consumer Confidence Rule

Aug 9Resolved

Consumer Confidence Rule

Aug 9Resolved

Consumer Confidence Rule

Jun 30Resolved

Consumer Confidence Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

May 1Resolved

Revised Total Coliform Rule

May 1Resolved

Revised Total Coliform Rule

May 1Resolved

Revised Total Coliform Rule

May 1Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

2022(65)

E. COLI

Dec 31Resolved

E. COLI

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

Revised Total Coliform Rule

Dec 31Resolved

E. COLI

Dec 31Resolved

E. COLI

Dec 31Resolved

Lead and Copper Rule

Jun 30Resolved

Lead and Copper Rule

Jun 30Resolved

Lead and Copper Rule

Jun 30Resolved

Lead and Copper Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Revised Total Coliform Rule

Apr 15Resolved

Revised Total Coliform Rule

Apr 15Resolved

Revised Total Coliform Rule

Apr 15Resolved

Revised Total Coliform Rule

Apr 15Resolved

o-Dichlorobenzene

Mar 31Resolved

1,2,4-Trichlorobenzene

Mar 31Resolved

Trichloroethylene

Mar 31Resolved

Trichloroethylene

Mar 31Resolved

1,1,1-Trichloroethane

Mar 31Resolved

1,1,1-Trichloroethane

Mar 31Resolved

Tetrachloroethylene

Mar 31Resolved

Tetrachloroethylene

Mar 31Resolved

cis-1,2-Dichloroethylene

Mar 31Resolved

cis-1,2-Dichloroethylene

Mar 31Resolved

Carbon tetrachloride

Mar 31Resolved

Carbon tetrachloride

Mar 31Resolved

1,2-Dichloroethane

Mar 31Resolved

1,2-Dichloroethane

Mar 31Resolved

DICHLOROMETHANE

Mar 31Resolved

DICHLOROMETHANE

Mar 31Resolved

o-Dichlorobenzene

Mar 31Resolved

trans-1,2-Dichloroethylene

Mar 31Resolved

p-Dichlorobenzene

Mar 31Resolved

p-Dichlorobenzene

Mar 31Resolved

1,1-Dichloroethylene

Mar 31Resolved

1,1-Dichloroethylene

Mar 31Resolved

1,2-Dichloropropane

Mar 31Resolved

1,2-Dichloropropane

Mar 31Resolved

1,1,2-Trichloroethane

Mar 31Resolved

1,1,2-Trichloroethane

Mar 31Resolved

CHLOROBENZENE

Mar 31Resolved

CHLOROBENZENE

Mar 31Resolved

Toluene

Mar 31Resolved

Toluene

Mar 31Resolved

Ethylbenzene

Mar 31Resolved

Ethylbenzene

Mar 31Resolved

Styrene

Mar 31Resolved

Styrene

Mar 31Resolved

Benzene

Mar 31Resolved

trans-1,2-Dichloroethylene

Mar 31Resolved

Vinyl chloride

Mar 31Resolved

Vinyl chloride

Mar 31Resolved

1,2,4-Trichlorobenzene

Mar 31Resolved

Benzene

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

E. COLI

Mar 31Resolved

E. COLI

Mar 31Resolved

How Does This Compare?

WILTON (06897) has 148 recorded violations, including 25 health-based. 4 remain unresolved. Consider testing your tap water independently for added peace of mind.

Recommended Water Filters

Based on the contaminants detected in your area, these filter types may help improve your water quality.

Reverse Osmosis System

Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.

Targets:Lead, Copper, Arsenic, Mercury, Cadmium

Look for:NSF/ANSI 58 certified

NSF Certified Products → EPA Safe Drinking Water Guide →

UV Water Purifier

Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.

Targets:E. coli, Coliform, Giardia, Cryptosporidium

Look for:NSF/ANSI 55 (Class A) certified

NSF Certified Products → EPA Safe Drinking Water Guide →

Always look for filters certified by NSF International for the specific contaminants you want to remove.

Water Quality in WILTON, CT (06897)

What does this mean?

Violations Detail (148 total)

Lead & Copper Levels

Violation Timeline

2025(6)

2024(35)

2023(40)

2022(65)

2021(2)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

UV Water Purifier

Nearby ZIP Codes

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