Water Quality in CHILMARK, MA (02535)

EPA violation data for public water systems serving ZIP code 02535.

90

Total Violations

0

Health-Based

90

Monitoring / Reporting

87

Resolved

What does this mean?

87 of 90 violations have been resolved. None of these are health-based violations — no contaminant levels exceeded federal safety limits. The remaining 90 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: 13 Population served: 1,919

Violations Detail (90 total)

ContaminantCategoryMCL LimitMeasuredDateStatusHealth Effects
Revised Total Coliform RuleMonitoringN/AN/AMay 31, 2025ActiveN/A
NitrateMonitoringN/AN/ADec 31, 2024ResolvedInfants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
NitrateMonitoringN/AN/ASep 30, 2024ResolvedInfants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
NitrateMonitoringN/AN/AJun 30, 2024ResolvedInfants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Lead and Copper RuleMonitoringN/AN/AJun 30, 2024ActiveN/A
NitrateMonitoringN/AN/AJun 30, 2024ResolvedInfants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
NitrateMonitoringN/AN/AMar 31, 2024ResolvedInfants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
NitrateMonitoringN/AN/ADec 31, 2023ResolvedInfants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
HexachlorocyclopentadieneMonitoringN/AN/ASep 30, 2023ResolvedN/A
EndothallMonitoringN/AN/ASep 30, 2023ResolvedN/A

Lead & Copper Levels

Violation Timeline

2025(1)

Revised Total Coliform Rule

4B

May 31Active

2024(6)

Nitrate

03

Dec 31Resolved

Nitrate

03

Sep 30Resolved

Nitrate

03

Jun 30Resolved

Lead and Copper Rule

52

Jun 30Active

Nitrate

03

Jun 30Resolved

Nitrate

03

Mar 31Resolved

How Does This Compare?

CHILMARK (02535) has 90 recorded violations, none of which are health-based. 3 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.

Nearby ZIP Codes

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