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KEYSTONE

South Dakota — Community Water System — PWSID: SD4601082

System Information

PWSIDSD4601082
System NameKEYSTONE
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region08
Serves SchoolNo
WholesalerNo
First ReportedDec 7, 1987
Last ReportedDec 9, 2025

Location & Contact

StateSouth Dakota
CityKEYSTONE
ZIP Code57751
AddressPO BOX 689
OrganizationKEYSTONE
Phone6056664827

Population & Service

Population Served349
Service Connections249

Drinking Water Violations (30)

This water system has 30 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
Jan 1, 2019 Mar 31, 2019 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Mar 31, 2019 Radionuclides and Revised Rad Rule
Jan 1, 2019 Mar 31, 2019 Combined Uranium MR No Yes — 30 ug/L — Resolved Mar 31, 2019 Radionuclides and Revised Rad Rule
Jan 1, 2019 Mar 31, 2019 Combined Uranium MR No Yes — 30 ug/L — Resolved Mar 31, 2019 Radionuclides and Revised Rad Rule
Jan 1, 2019 Mar 31, 2019 Combined Uranium MR No Yes — 30 ug/L — Resolved Mar 31, 2019 Radionuclides and Revised Rad Rule
Jan 1, 2019 Mar 31, 2019 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Mar 31, 2019 Radionuclides and Revised Rad Rule
Jan 1, 2019 Mar 31, 2019 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Mar 31, 2019 Radionuclides and Revised Rad Rule
Jan 1, 2019 Mar 31, 2019 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Mar 31, 2019 Radionuclides and Revised Rad Rule
Jan 1, 2019 Mar 31, 2019 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Mar 31, 2019 Radionuclides and Revised Rad Rule
Jan 1, 2019 Mar 31, 2019 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Mar 31, 2019 Radionuclides and Revised Rad Rule
Oct 1, 2015 Oct 31, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2015 Total Coliform Rule
Oct 1, 2015 Oct 31, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2015 Total Coliform Rule
Oct 1, 2015 Oct 31, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2015 Total Coliform Rule
Sep 1, 2015 Sep 30, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Sep 30, 2015 Total Coliform Rule
Sep 1, 2015 Sep 30, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Sep 30, 2015 Total Coliform Rule
Sep 1, 2015 Sep 30, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Sep 30, 2015 Total Coliform Rule
Sep 1, 2015 Sep 30, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Sep 30, 2015 Total Coliform Rule
Jun 1, 2015 Jun 30, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jun 30, 2015 Total Coliform Rule
Jun 1, 2015 Jun 30, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jun 30, 2015 Total Coliform Rule
Jun 1, 2015 Jun 30, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jun 30, 2015 Total Coliform Rule
Jun 1, 2015 Jun 30, 2015 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jun 30, 2015 Total Coliform Rule
Oct 1, 2010 — Lead and Copper Rule MR No No — TT — Resolved Sep 7, 2011 Lead and Copper Rule
Oct 1, 2010 — Lead and Copper Rule MR No No — TT — Resolved Sep 7, 2011 Lead and Copper Rule
Oct 1, 2010 — Lead and Copper Rule MR No No — TT — Resolved Sep 7, 2011 Lead and Copper Rule
Jul 1, 2000 Aug 9, 2000 Consumer Confidence Rule Other No Yes — — — Resolved Aug 9, 2000 Consumer Confidence Rule
Sep 1, 1995 Sep 30, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Sep 30, 1995 Total Coliform Rule
Sep 1, 1995 Sep 30, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Sep 30, 1995 Total Coliform Rule
Nov 8, 1989 Nov 7, 1992 Arsenic MR No Yes — 0.010 mg/L — Resolved Nov 7, 1992 Arsenic Rule
Nov 8, 1989 Nov 7, 1992 Arsenic MR No Yes — 0.010 mg/L — Resolved Nov 7, 1992 Arsenic Rule
Nov 8, 1989 Nov 7, 1992 Arsenic MR No Yes — 0.010 mg/L — Resolved Nov 7, 1992 Arsenic Rule
Nov 8, 1989 Nov 7, 1992 Barium MR No Yes — 2 mg/L — Resolved Nov 7, 1992 Inorganic 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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