MA4197001 · Massachusetts

SIASCONSET WATER DEPARTMENT

Federal fiscal 2026Q3 · EPA violation and follow-up records

Violation records shown: 33
EPA health-based flag: 0
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 31

Counties listed by EPA · Nantucket County, Massachusetts

Find the utility’s annual water quality report. For current advisories, check the utility or local drinking-water authority.

Violations and what followed

Among 1 resolved record with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 45 days. The interval uses the reporting periods and dates on file.

Other or unclassified · Unaddressed by formal action
Consumer Confidence Report Inadequate ReportingViolation 85 · Consumer Confidence Rule · Consumer Confidence Rule
Noncompliance period start July 2, 2025 · first reported March 17, 2026
No linked action row appears in the records shown.
Monitoring or reporting · Archived
Monitoring, RegularViolation 84 · Nitrate · Nitrate Rule
Noncompliance period start April 1, 2025 · period end June 30, 2025 · first reported September 17, 2025 · EPA return-to-compliance field June 30, 2025

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
24 August 4, 2025 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 99 · BHC-GAMMA · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 98 · Methoxychlor · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 97 · 2,4,5-TP · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 96 · Toxaphene · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 95 · Pentachlorophenol · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 94 · Heptachlor · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 93 · Heptachlor epoxide · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 92 · ETHYLENE DIBROMIDE · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 91 · Endrin · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 90 · 2,4-D · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 89 · Chlordane · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 88 · Carbofuran · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 87 · Atrazine · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 86 · LASSO · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 115 · 2,3,7,8-TCDD · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 114 · Simazine · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 113 · Picloram · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 112 · OXAMYL · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 111 · Hexachlorocyclopentadiene · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 110 · HEXACHLOROBENZENE · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 109 · Glyphosate · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 108 · Endothall · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 107 · Diquat · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 106 · Dinoseb · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 105 · Di(2-ethylhexyl) phthalate · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 104 · Di(2-ethylhexyl) adipate · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 103 · Dalapon · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 102 · Benzo(a)pyrene · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 101 · 1,2-DIBROMO-3-CHLOROPROPANE · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued
Monitoring or reporting · Archived
Monitoring, RegularViolation 100 · Total Polychlorinated Biphenyls (PCB) · Synthetic Organic Chemicals
Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 24, 2026 · EPA return-to-compliance field June 30, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
23 September 9, 2024 Formal State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
24	August 4, 2025	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
23	September 9, 2024	Formal	State Administrative/Compliance Order without penalty issued

Other or unclassified · Resolved

Consumer Confidence Report Complete Failure to ReportViolation 45 · Consumer Confidence Rule · Consumer Confidence Rule

Noncompliance period start July 1, 2022 · period end August 15, 2022 · first reported September 15, 2022 · EPA return-to-compliance field August 15, 2022

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
22	August 15, 2022	Resolving	State Compliance achieved
21	August 16, 2022	Formal	State Administrative/Compliance Order without penalty issued

EPA data and scope

How to read the records

The enforcement snapshot is federal fiscal 2026Q3. The EPA archive labels its violation file October 13, 2026. EPA says federal reporting can lag by several months. For current advisories, check your utility or local drinking-water authority.

We matched active community water systems by public water system ID between EPA’s system search and SDWIS inventory. We show violations with a recorded noncompliance, initial reporting or return-to-compliance date from 2021 onward, plus earlier records listed as Addressed or Unaddressed.
EPA’s health-based flag identifies violations of contaminant or disinfectant limits or treatment requirements. Monitoring and reporting violations describe required tests or reports. Neither category measures household exposure.
Addressed means EPA records formal enforcement on a violation that remains unresolved in the snapshot. Unaddressed means no formal action is recorded for an unresolved violation. Resolved can mean compliance was restored, the rule ceased to apply, or further action was unnecessary. Archived is a separate status.
We count a violation once per water system and group its distinct linked actions. Conflicting records are set aside. Places are EPA-listed search locations and can include mailing locations. Use the provider name and system ID to identify your service.

EPA data dictionary and files · EPA reporting and enforcement FAQ · Find an annual water quality report · How to get the report from your utility