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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 ReportedMar 2, 2026

Location & Contact

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

Population & Service

Population Served255
Service Connections163

Drinking Water Violations (59)

This water system has 59 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 — TT Yes No — — — Resolved Feb 9, 2023 —
Nov 23, 2020 — TT Yes No — — — Resolved Feb 9, 2023 —
Feb 1, 2015 — TT Yes No — — — Resolved Apr 14, 2016 —
Feb 1, 2015 — TT Yes No — — — Resolved Apr 14, 2016 —
Feb 1, 2011 — TT Yes No — — — Resolved Mar 14, 2011 —
Feb 1, 2011 — TT Yes No — — — Resolved Mar 14, 2011 —
Feb 23, 2006 — TT Yes No — — — Resolved Aug 16, 2007 —
Feb 23, 2006 — TT Yes No — — — Resolved Aug 16, 2007 —
Jul 1, 2001 Jul 31, 2001 MCL Yes No — 5% of samples — Resolved Jul 31, 2001 —
Jul 1, 2001 Jul 31, 2001 MCL Yes No — 5% of samples — Resolved Jul 31, 2001 —
Jul 1, 2001 Jul 31, 2001 MCL Yes No — 5% of samples — Resolved Jul 31, 2001 —
Dec 1, 1999 Dec 31, 1999 MCL Yes No — 5% of samples — Resolved Dec 31, 1999 —
Dec 1, 1999 Dec 31, 1999 MCL Yes No — 5% of samples — Resolved Dec 31, 1999 —
Dec 1, 1999 Dec 31, 1999 MCL Yes No — 5% of samples — Resolved Dec 31, 1999 —
Sep 1, 1997 Sep 30, 1997 MCL Yes No — 5% of samples — Resolved Sep 30, 1997 —
Sep 1, 1997 Sep 30, 1997 MCL Yes No — 5% of samples — Resolved Sep 30, 1997 —
Sep 1, 1997 Sep 30, 1997 MCL Yes No — 5% of samples — Resolved Sep 30, 1997 —
Aug 1, 1994 Aug 31, 1994 MCL Yes No — 5% of samples — Resolved Aug 31, 1994 —
Aug 1, 1994 Aug 31, 1994 MCL Yes No — 5% of samples — Resolved Aug 31, 1994 —
Aug 1, 1994 Aug 31, 1994 MCL Yes No — 5% of samples — Resolved Aug 31, 1994 —
Nov 1, 1993 Nov 30, 1993 MCL Yes No — 5% of samples — Resolved Nov 30, 1993 —
Nov 1, 1993 Nov 30, 1993 MCL Yes No — 5% of samples — Resolved Nov 30, 1993 —
Nov 1, 1993 Nov 30, 1993 MCL Yes No — 5% of samples — Resolved Nov 30, 1993 —
Sep 1, 1993 Sep 30, 1993 MR No No — 5% of samples — Archived Sep 30, 1993 —
Sep 1, 1993 Sep 30, 1993 MR No No — 5% of samples — Archived Sep 30, 1993 —
Aug 1, 1992 Aug 31, 1992 MR No No — 5% of samples — Archived Aug 31, 1992 —
Aug 1, 1992 Aug 31, 1992 MCL Yes No — 5% of samples — Resolved Aug 31, 1992 —
Aug 1, 1992 Aug 31, 1992 MR No No — 5% of samples — Archived Aug 31, 1992 —
Aug 1, 1992 Aug 31, 1992 MCL Yes No — 5% of samples — Resolved Aug 31, 1992 —
Aug 1, 1992 Aug 31, 1992 MCL Yes No — 5% of samples — Resolved Aug 31, 1992 —
Feb 13, 1992 Mar 12, 1992 Other No No — — — Archived Mar 12, 1992 —
Dec 16, 1991 Jan 15, 1992 Other No No — — — Archived Jan 15, 1992 —
Dec 1, 1991 Dec 31, 1991 MCL Yes No — 5% of samples — Resolved Dec 31, 1991 —
Dec 1, 1991 Dec 31, 1991 MCL Yes No — 5% of samples — Resolved Dec 31, 1991 —
Dec 1, 1991 Dec 31, 1991 MCL Yes No — 5% of samples — Resolved Dec 31, 1991 —
Dec 1, 1991 Dec 31, 1991 MCL Yes No — 5% of samples — Resolved Dec 31, 1991 —
Oct 1, 1991 Oct 31, 1991 MCL Yes No — 5% of samples — Resolved Oct 31, 1991 —
Oct 1, 1991 Oct 31, 1991 MCL Yes No — 5% of samples — Resolved Oct 31, 1991 —
Oct 1, 1991 Oct 31, 1991 MCL Yes No — 5% of samples — Resolved Oct 31, 1991 —
Aug 1, 1991 Aug 31, 1991 MR No Yes — 5% of samples — Archived Aug 31, 1991 —
Oct 4, 1990 Nov 3, 1990 Other No No — — — Archived Nov 3, 1990 —
Jul 1, 1976 Jun 30, 1980 MR No No — 5 pCi/L — Archived Jun 30, 1980 —
Jul 1, 1976 Jun 30, 1980 MR No No — 15 pCi/L — Archived Jun 30, 1980 —
— — — No No — — — — — —
— — — No No — — — — — —
— — — No No — — — — — —
— — — No No — — — — — —
— — — No No — — — — — —
— — — No No — — — — — —
— — — No No — — — — — —

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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