Water Quality in NEW CANAAN, CT (06840)

EPA violation data for public water systems serving ZIP code 06840.

Total Violations

Health-Based

Monitoring / Reporting

Resolved

What does this mean?

68 of 76 violations have been resolved. 11 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 65 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: 2,361

Violations Detail (76 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Public Notice	Monitoring	N/A	N/A	May 30, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 30, 2025	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jan 3, 2025	Active	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 1, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 1, 2024	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Sep 1, 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
Public Notice	Monitoring	N/A	N/A	Nov 5, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Nov 5, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2023	Active	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Active	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Active	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Active	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 1, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 1, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 1, 2023	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	May 1, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Apr 22, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Active	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Active	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Active	N/A
Public Notice	Monitoring	N/A	N/A	Mar 29, 2023	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Mar 29, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Oct 21, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Oct 21, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Oct 21, 2022	Resolved	N/A
Revised Total Coliform Rule	Health-Based	N/A	N/A	Oct 21, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2022	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jul 29, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jul 29, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 30, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	May 30, 2022	Resolved	N/A
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
E. COLI	Monitoring	0	N/A	Dec 20, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 20, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 20, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 20, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 20, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 20, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 20, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Dec 20, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Nov 17, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Nov 17, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Nov 17, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
E. COLI	Monitoring	0	N/A	Nov 17, 2021	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Public Notice	Monitoring	N/A	N/A	Oct 9, 2021	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Oct 9, 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
Lead and Copper Rule	Monitoring	N/A	N/A	Sep 28, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 30, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	N/A

Lead & Copper Levels

Violation Timeline

2025(5)

Public Notice

May 30Resolved

Public Notice

May 30Resolved

Lead and Copper Rule

Mar 31Resolved

Lead and Copper Rule

Mar 31Resolved

Public Notice

Jan 3Active

2024(8)

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Sep 30Resolved

Lead and Copper Rule

Sep 28Resolved

Revised Total Coliform Rule

Sep 1Resolved

Revised Total Coliform Rule

Sep 1Resolved

Revised Total Coliform Rule

Sep 1Resolved

How Does This Compare?

NEW CANAAN (06840) has 76 recorded violations, including 11 health-based. 8 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 NEW CANAAN, CT (06840)

What does this mean?

Violations Detail (76 total)

Lead & Copper Levels

Violation Timeline

2025(5)

2024(8)

2023(20)

2022(16)

2021(27)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

UV Water Purifier

Nearby ZIP Codes

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