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UNALASKA WATER SYSTEM

Alaska — Community Water System — PWSID: AK2260309

System Information

PWSIDAK2260309
System NameUNALASKA WATER SYSTEM
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region10
Serves SchoolNo
WholesalerNo
First ReportedFeb 7, 1981
Last ReportedDec 19, 2025

Location & Contact

StateAlaska
CityUNALASKA
ZIP Code99685
AddressP.O. BOX 610
OrganizationHERNANDEZ, ERIK_OP2
Phone907-581-1260

Population & Service

Population Served9,400
Service Connections603

Drinking Water Violations (377)

This water system has 377 violations recorded in the EPA SDWIS database.

Begin Date End Date Contaminant Category Health-Based Major Measured Federal MCL State MCL Status Return to Compliance Rule
May 1, 2024 May 31, 2024 Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2024 Surface Water Treatment Rule
May 1, 2024 May 31, 2024 Revised Total Coliform Rule MON No No — — — Resolved May 31, 2024 Revised Total Coliform Rule
May 1, 2024 May 31, 2024 Chlorine MR No Yes — 4.0 mg/L — Resolved May 31, 2024 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2024 Dec 31, 2024 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 23, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2024 Dec 31, 2024 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 23, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2024 Dec 31, 2024 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2024 Nitrate Rule
Oct 1, 2023 Dec 31, 2023 CARBON, TOTAL MR No Yes — TT — Resolved Dec 31, 2023 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2023 Sep 30, 2023 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2023 Stage 1 Disinfectants and Disinfection Byproducts Rule
May 1, 2022 May 31, 2022 Revised Total Coliform Rule MON No No — — — Resolved May 31, 2022 Revised Total Coliform Rule
May 1, 2022 May 31, 2022 Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2022 Surface Water Treatment Rule
Apr 1, 2022 Jun 30, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Jun 1, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Nov 1, 2021 Nov 30, 2021 Revised Total Coliform Rule MON No No — — — Resolved Nov 30, 2021 Revised Total Coliform Rule
May 1, 2018 May 31, 2018 Surface Water Treatment Rule MR No Yes — — — Resolved May 31, 2018 Surface Water Treatment Rule
May 1, 2018 May 31, 2018 Revised Total Coliform Rule MON No No — — — Resolved May 31, 2018 Revised Total Coliform Rule
Apr 1, 2018 Jun 30, 2018 Chlorine MR No Yes — 4.0 mg/L — Resolved Jun 1, 2018 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2015 Apr 30, 2015 Surface Water Treatment Rule MR No Yes — — — Resolved Apr 30, 2015 Surface Water Treatment Rule
Apr 1, 2015 Apr 30, 2015 Coliform (TCR) MR No No — 5% of samples — Resolved Apr 30, 2015 Total Coliform Rule
Mar 1, 2015 Mar 31, 2015 Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2015 Surface Water Treatment Rule
Jan 1, 2015 Mar 31, 2015 Chlorine MR No Yes — 4.0 mg/L — Resolved Mar 31, 2015 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2014 Dec 31, 2014 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2014 Stage 1 Disinfectants and Disinfection Byproducts Rule
Aug 1, 2014 Aug 31, 2014 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2014 Total Coliform Rule
Aug 1, 2014 Aug 31, 2014 Surface Water Treatment Rule MR No No — — — Resolved Aug 31, 2014 Surface Water Treatment Rule
Jul 1, 2014 Sep 30, 2014 Chlorine MR No No — 4.0 mg/L — Resolved Sep 30, 2014 Stage 1 Disinfectants and Disinfection Byproducts Rule
Dec 1, 2012 Dec 31, 2012 Surface Water Treatment Rule MR No Yes — — — Resolved Dec 31, 2012 Surface Water Treatment Rule
Oct 1, 2012 Dec 31, 2012 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Dec 1, 2011 Dec 31, 2011 Surface Water Treatment Rule MR No Yes — — — Resolved Dec 31, 2011 Surface Water Treatment Rule
Jul 1, 2010 Jul 31, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 31, 2010 Total Coliform Rule
Jul 1, 2010 Sep 30, 2010 Chlorine MR No No — 4.0 mg/L — Resolved Sep 30, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2010 Jul 31, 2010 Surface Water Treatment Rule MR No No — — — Resolved Jul 31, 2010 Surface Water Treatment Rule
Apr 1, 2010 Apr 30, 2010 Surface Water Treatment Rule MR No Yes — — — Resolved Apr 30, 2010 Surface Water Treatment Rule
Feb 1, 2010 Feb 28, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Feb 28, 2010 Total Coliform Rule
Jan 1, 2010 Jan 31, 2010 Coliform (TCR) MR No No — 5% of samples — Resolved Jan 31, 2010 Total Coliform Rule
Dec 1, 2009 Dec 31, 2009 Surface Water Treatment Rule MR No Yes — — — Resolved Dec 31, 2009 Surface Water Treatment Rule
Dec 1, 2009 Dec 31, 2009 Coliform (TCR) MR No No — 5% of samples — Resolved Dec 31, 2009 Total Coliform Rule
Jan 1, 2009 Dec 31, 2009 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2009 Nitrate Rule
Jan 1, 2009 Dec 31, 2009 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2009 Nitrate Rule
Aug 1, 2007 Aug 31, 2007 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2007 Total Coliform Rule
Aug 1, 2007 Aug 31, 2007 Surface Water Treatment Rule MR No Yes — — — Resolved Aug 31, 2007 Surface Water Treatment Rule
Jan 1, 2004 Jan 31, 2004 Surface Water Treatment Rule TT Yes No — — — Resolved Jan 31, 2004 Surface Water Treatment Rule
Mar 1, 2003 Mar 31, 2003 Surface Water Treatment Rule TT Yes No — — — Resolved Mar 31, 2003 Surface Water Treatment Rule
Jan 1, 2003 Dec 31, 2003 Arsenic MR No Yes — 0.010 mg/L — Resolved Dec 31, 2003 Arsenic Rule
Jan 1, 2003 Jan 31, 2003 Surface Water Treatment Rule TT Yes No — — — Resolved Jan 31, 2003 Surface Water Treatment Rule
Sep 1, 2001 Sep 30, 2001 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2001 Total Coliform Rule
Jul 1, 2001 Sep 30, 2001 Simazine MR No Yes — 0.004 mg/L — Resolved Sep 30, 2001 Synthetic Organic Chemicals
Jul 1, 2001 Sep 30, 2001 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Sep 30, 2001 Synthetic Organic Chemicals
Jul 1, 2001 Sep 30, 2001 2,3,7,8-TCDD MR No Yes — 0.00000003 mg/L — Resolved Sep 30, 2001 Synthetic Organic Chemicals
Jul 1, 2001 Sep 30, 2001 Di(2-ethylhexyl) adipate MR No Yes — 0.4 mg/L — Resolved Sep 30, 2001 Synthetic Organic Chemicals
Jul 1, 2001 Sep 30, 2001 Diquat MR No Yes — 0.02 mg/L — Resolved Sep 30, 2001 Synthetic Organic Chemicals
Jul 1, 2001 Sep 30, 2001 Heptachlor epoxide MR No Yes — 0.0002 mg/L — Resolved Sep 30, 2001 Synthetic Organic Chemicals
Jul 1, 2001 Sep 30, 2001 Endothall MR No Yes — 0.1 mg/L — Resolved Sep 30, 2001 Synthetic Organic Chemicals

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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