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WILLOW LAKE

South Dakota — Community Water System — PWSID: SD4600370

System Information

PWSIDSD4600370
System NameWILLOW LAKE
System TypeCommunity Water System
Water SourceGround Water Purchased
Activity StatusActive
Owner TypeLocal
EPA Region08
Serves SchoolNo
WholesalerNo
First ReportedFeb 13, 1979
Last ReportedDec 9, 2025

Location & Contact

StateSouth Dakota
CityWILLOW LAKE
ZIP Code57278
AddressPO BOX 317
OrganizationWILLOW LAKE
Phone6056253631

Population & Service

Population Served255
Service Connections163

Drinking Water Violations (24)

This water system has 24 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
Nov 23, 2020 — Stage 1 Disinfectants and Disinfection Byproducts Rule TT Yes No — — — Resolved Feb 9, 2023 Stage 1 Disinfectants and Disinfection Byproducts Rule
Nov 23, 2020 — Stage 1 Disinfectants and Disinfection Byproducts Rule TT Yes No — — — Resolved Feb 9, 2023 Stage 1 Disinfectants and Disinfection Byproducts Rule
Feb 1, 2015 — Stage 1 Disinfectants and Disinfection Byproducts Rule TT Yes No — — — Resolved Apr 14, 2016 Stage 1 Disinfectants and Disinfection Byproducts Rule
Feb 1, 2015 — Stage 1 Disinfectants and Disinfection Byproducts Rule TT Yes No — — — Resolved Apr 14, 2016 Stage 1 Disinfectants and Disinfection Byproducts Rule
Feb 1, 2011 — Stage 1 Disinfectants and Disinfection Byproducts Rule TT Yes No — — — Resolved Mar 14, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Feb 1, 2011 — Stage 1 Disinfectants and Disinfection Byproducts Rule TT Yes No — — — Resolved Mar 14, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Feb 23, 2006 — Stage 1 Disinfectants and Disinfection Byproducts Rule TT Yes No — — — Resolved Aug 16, 2007 Stage 1 Disinfectants and Disinfection Byproducts Rule
Feb 23, 2006 — Stage 1 Disinfectants and Disinfection Byproducts Rule TT Yes No — — — Resolved Aug 16, 2007 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2001 Jul 31, 2001 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jul 31, 2001 Total Coliform Rule
Jul 1, 2001 Jul 31, 2001 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jul 31, 2001 Total Coliform Rule
Jul 1, 2001 Jul 31, 2001 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jul 31, 2001 Total Coliform Rule
Dec 1, 1999 Dec 31, 1999 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Dec 31, 1999 Total Coliform Rule
Dec 1, 1999 Dec 31, 1999 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Dec 31, 1999 Total Coliform Rule
Sep 1, 1997 Sep 30, 1997 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Sep 30, 1997 Total Coliform Rule
Aug 1, 1994 Aug 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1994 Total Coliform Rule
Aug 1, 1994 Aug 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1994 Total Coliform Rule
Nov 1, 1993 Nov 30, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Nov 30, 1993 Total Coliform Rule
Nov 1, 1993 Nov 30, 1993 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Nov 30, 1993 Total Coliform Rule
Aug 1, 1992 Aug 31, 1992 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 1992 Total Coliform Rule
Dec 1, 1991 Dec 31, 1991 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Dec 31, 1991 Total Coliform Rule
Oct 1, 1991 Oct 31, 1991 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 1991 Total Coliform Rule
Oct 1, 1991 Oct 31, 1991 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 1991 Total Coliform Rule
Jul 1, 1976 Jun 30, 1980 Combined Radium (-226 and -228) MR No No — 5 pCi/L — Archived Jun 30, 1980 Radionuclides and Revised Rad Rule
Jul 1, 1976 Jun 30, 1980 Gross Alpha, Excl. Radon and U MR No No — 15 pCi/L — Archived Jun 30, 1980 Radionuclides and Revised Rad Rule

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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