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OACOMA

South Dakota — Community Water System — PWSID: SD4600229

System Information

PWSIDSD4600229
System NameOACOMA
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region08
Serves SchoolNo
WholesalerNo
First ReportedFeb 13, 1979
Last ReportedDec 9, 2025

Location & Contact

StateSouth Dakota
CityOACOMA
ZIP Code57365
AddressPO BOX 129
OrganizationOACOMA
Phone6057344455

Population & Service

Population Served386
Service Connections190

Drinking Water Violations (44)

This water system has 44 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
Jun 14, 2014 — Other No No — — — Resolved Aug 24, 2015 Ground Water Rule
Jun 14, 2014 — Other No No — — — Resolved Aug 24, 2015 Ground Water Rule
Apr 1, 2013 Jun 30, 2013 TTHM MCL Yes No .093 MG/L 0.080 mg/L — Resolved Jun 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2013 Jun 30, 2013 TTHM MCL Yes No .093 MG/L 0.080 mg/L — Resolved Jun 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2013 Jun 30, 2013 TTHM MCL Yes No .093 MG/L 0.080 mg/L — Resolved Jun 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2013 Mar 31, 2013 TTHM MCL Yes No .089 MG/L 0.080 mg/L — Resolved Mar 31, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2013 Mar 31, 2013 TTHM MCL Yes No .089 MG/L 0.080 mg/L — Resolved Mar 31, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2013 Mar 31, 2013 TTHM MCL Yes No .089 MG/L 0.080 mg/L — Resolved Mar 31, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 TTHM MCL Yes No .091 MG/L 0.080 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 TTHM MCL Yes No .091 MG/L 0.080 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 TTHM MCL Yes No .091 MG/L 0.080 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 TTHM MCL Yes No .091 MG/L 0.080 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 Total Haloacetic Acids (HAA5) MCL Yes No .062 MG/L 0.060 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 Total Haloacetic Acids (HAA5) MCL Yes No .062 MG/L 0.060 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 Total Haloacetic Acids (HAA5) MCL Yes No .062 MG/L 0.060 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2012 Dec 31, 2012 Total Haloacetic Acids (HAA5) MCL Yes No .062 MG/L 0.060 mg/L — Resolved Dec 31, 2012 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2012 Sep 30, 2012 TTHM MCL Yes No .093 MG/L 0.080 mg/L — Resolved Sep 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2012 Sep 30, 2012 TTHM MCL Yes No .093 MG/L 0.080 mg/L — Resolved Sep 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2012 Sep 30, 2012 TTHM MCL Yes No .093 MG/L 0.080 mg/L — Resolved Sep 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2012 Sep 30, 2012 TTHM MCL Yes No .093 MG/L 0.080 mg/L — Resolved Sep 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2012 Jun 30, 2012 CARBON, TOTAL TT Yes No — TT — Resolved Jun 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2012 Jun 30, 2012 CARBON, TOTAL TT Yes No — TT — Resolved Jun 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2012 Jun 30, 2012 CARBON, TOTAL TT Yes No — TT — Resolved Jun 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2012 Jun 30, 2012 CARBON, TOTAL TT Yes No — TT — Resolved Jun 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2012 Jun 30, 2012 TTHM MCL Yes No .087 MG/L 0.080 mg/L — Resolved Jun 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2012 Jun 30, 2012 TTHM MCL Yes No .087 MG/L 0.080 mg/L — Resolved Jun 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2012 Jun 30, 2012 TTHM MCL Yes No .087 MG/L 0.080 mg/L — Resolved Jun 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2012 Jun 30, 2012 TTHM MCL Yes No .087 MG/L 0.080 mg/L — Resolved Jun 30, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Mar 31, 2012 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Mar 31, 2012 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Mar 31, 2012 TTHM MCL Yes No .083 MG/L 0.080 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Mar 31, 2012 TTHM MCL Yes No .083 MG/L 0.080 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Mar 31, 2012 TTHM MCL Yes No .083 MG/L 0.080 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Mar 31, 2012 TTHM MCL Yes No .083 MG/L 0.080 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2012 Mar 31, 2012 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L — Resolved Mar 31, 2012 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jun 25, 2011 — Other No No — — — Resolved Apr 4, 2012 Ground Water Rule
Jun 25, 2011 — Other No No — — — Resolved Apr 4, 2012 Ground Water Rule
Oct 1, 2004 Dec 31, 2004 CARBON, TOTAL TT Yes No — TT — Resolved Dec 31, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2004 Dec 31, 2004 CARBON, TOTAL TT Yes No — TT — Resolved Dec 31, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jun 1, 1996 Jun 30, 1996 Coliform (TCR) MR No Yes — 5% of samples — Archived Jun 30, 1996 Total Coliform Rule
Jan 1, 1993 Mar 31, 1993 Nitrate MR No Yes — 10 mg/L — Resolved Mar 31, 1993 Nitrate Rule
Jan 1, 1993 Mar 31, 1993 Nitrate MR No Yes — 10 mg/L — Resolved Mar 31, 1993 Nitrate 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
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

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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