Drinking Water Compliance OS

Chilmark, 01

Aquinnah Wampanoag Water System

Current status

2 items on record are open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace EPA Region 1’s official records. Always confirm current status with EPA Region 1 before making decisions based on this information.

System facts

System ID (PWSID)
010307001
System type
Community Water System
Population served
89
Service connections
32
Ownership
Native American tribal
Water source
groundwater (wells)

Violation history

  • Monitoring, Regular

    Nitrate

    October 1, 2025 – December 31, 2025

    Archived
  • Report Sample Result/Fail Monitor (RTCR)

    Revised Total Coliform Rule

    June 1, 2025 – September 18, 2025

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2025 – March 31, 2025

    Archived
  • Monitoring, Regular

    Nitrate

    October 1, 2024 – December 31, 2024

    Archived
  • Monitoring, Regular

    Nitrate

    July 1, 2024 – September 30, 2024

    Archived
  • Follow-up Or Routine LCR Tap M/R

    Lead and Copper Rule

    July 1, 2024 – June 30, 2025

    Resolved
  • Monitoring, Regular

    Nitrate

    April 1, 2024 – June 30, 2024

    Archived
  • Monitoring, Regular

    Nitrate

    January 1, 2024 – March 31, 2024

    Archived
  • Monitoring, Regular

    Nitrate

    October 1, 2023 – December 31, 2023

    Archived
  • Monitoring, Regular

    Selenium

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Arsenic

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Barium

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Cadmium

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Chromium

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    CYANIDE

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Fluoride

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Mercury

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Thallium, Total

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2023 – March 31, 2023

    Resolved
  • Monitoring, Regular

    Beryllium, Total

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Antimony, Total

    January 1, 2023 – December 31, 2023

    Resolved
  • Monitoring, Regular

    Nitrate

    October 1, 2022 – December 31, 2022

    Archived
  • Report Sample Result/Fail Monitor (RTCR)

    Revised Total Coliform Rule

    May 1, 2022 – August 15, 2022

    Resolved
  • Monitoring, Regular

    Nitrate

    April 1, 2022 – June 30, 2022

    Archived
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    February 1, 2020 – February 29, 2020

    Resolved
  • Follow-up Or Routine LCR Tap M/R

    Lead and Copper Rule

    July 1, 2019 – February 24, 2020

    Resolved
  • Report Sample Result/Fail Monitor (RTCR)

    Revised Total Coliform Rule

    July 1, 2019 – August 15, 2020

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2019 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Total Polychlorinated Biphenyls (PCB)

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Endrin

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    BHC-GAMMA

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Methoxychlor

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Toxaphene

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Dalapon

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) adipate

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    OXAMYL

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Simazine

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) phthalate

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Picloram

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Dinoseb

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Hexachlorocyclopentadiene

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Carbofuran

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Atrazine

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    LASSO

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Heptachlor

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Heptachlor epoxide

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    2,4-D

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    2,4,5-TP

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    HEXACHLOROBENZENE

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Benzo(a)pyrene

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Pentachlorophenol

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    ETHYLENE DIBROMIDE

    January 1, 2017 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Chlordane

    January 1, 2017 – December 31, 2019

    Resolved
  • Follow-up Or Routine LCR Tap M/R

    Lead and Copper Rule

    June 1, 2016 – October 21, 2016

    Resolved
  • Monitoring, Source Water (GWR)

    E. COLI

    June 1, 2016

    Unaddressed
  • Monitoring, Source Water (GWR)

    E. COLI

    December 1, 2015

    Unaddressed
  • Monitoring, Regular

    Nitrate

    January 1, 2015 – December 31, 2015

    Archived
  • Follow-up Or Routine LCR Tap M/R

    Lead and Copper Rule

    January 1, 2015 – October 22, 2015

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    August 1, 2014 – August 31, 2014

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    January 1, 2014 – February 13, 2014

    Resolved
  • Follow-up Or Routine LCR Tap M/R

    Lead and Copper Rule

    January 1, 2014 – August 15, 2014

    Resolved
  • Monitoring, Routine Minor (TCR)

    Coliform (TCR)

    August 1, 2011 – August 31, 2011

    Resolved
  • Monitoring, Repeat Minor (TCR)

    Coliform (TCR)

    July 1, 2011 – July 13, 2011

    Resolved
  • Maximum Contaminant Level Violation, Acute (TCR)

    Health-based

    Coliform (TCR)

    July 1, 2011 – July 31, 2011

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    February 1, 2011 – February 28, 2011

    Resolved
  • Monitoring, Regular

    Cadmium

    January 1, 2011 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Arsenic

    January 1, 2011 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Antimony, Total

    January 1, 2011 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Selenium

    January 1, 2011 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Beryllium, Total

    January 1, 2011 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Thallium, Total

    January 1, 2011 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Mercury

    January 1, 2011 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Fluoride

    January 1, 2011 – December 31, 2019

    Resolved
  • Monitoring, Regular

    CYANIDE

    January 1, 2011 – December 31, 2019

    Resolved
  • Monitoring, Regular

    Chromium

    January 1, 2011 – December 31, 2019

    Resolved
  • Follow-up Or Routine LCR Tap M/R

    Lead and Copper Rule

    January 1, 2011 – August 18, 2011

    Resolved
  • Monitoring, Regular

    Barium

    January 1, 2011 – December 31, 2019

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    October 1, 2010 – October 31, 2010

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    August 1, 2010 – August 31, 2010

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    July 1, 2010 – July 31, 2010

    Resolved
  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    June 29, 2010 – June 25, 2013

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    March 1, 2010 – March 31, 2010

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    August 1, 2009 – August 31, 2009

    Resolved
  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    July 1, 2009 – November 5, 2009

    Resolved
  • Monitoring, Regular

    Nitrate

    April 1, 2009 – June 30, 2009

    Resolved
  • WQP Entry Point/Tap Treatment Technique Non-Compliance

    Health-based

    Lead and Copper Rule

    January 1, 2009 – June 30, 2009

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    October 1, 2008 – October 31, 2008

    Resolved
  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    September 1, 2007 – September 30, 2007

    Resolved
  • Water Quality Parameter M/R

    Lead and Copper Rule

    July 1, 2007 – December 31, 2007

    Archived
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 1, 2006 – July 12, 2006

    Resolved
  • Maximum Contaminant Level Violation, Acute (TCR)

    Health-based

    Coliform (TCR)

    July 1, 2006 – July 31, 2006

    Resolved
  • Follow-up Or Routine LCR Tap M/R

    Lead and Copper Rule

    July 1, 2005 – June 19, 2006

    Resolved

Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the stateUnaddressed no corrective action on record yet

Enforcement actions

Contact

Aquinnah Wampanoag Tribal Housing Authority

5086452711

Chilmark, MA 02535