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NEW UNDERWOOD

South Dakota — Community Water System — PWSID: SD4600224

System Information

PWSIDSD4600224
System NameNEW UNDERWOOD
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region08
Serves SchoolNo
WholesalerNo
First ReportedFeb 13, 1979
Last ReportedDec 9, 2025

Location & Contact

StateSouth Dakota
CityNEW UNDERWOOD
ZIP Code57761
AddressPO BOX 278
OrganizationNEW UNDERWOOD
Phone6057546777

Population & Service

Population Served679
Service Connections269

Drinking Water Violations (125)

This water system has 125 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
Oct 1, 2022 Dec 31, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2022 Dec 31, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2022 Dec 31, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2022 Oct 31, 2022 Revised Total Coliform Rule MON No Yes — — — Resolved Oct 31, 2022 Revised Total Coliform Rule
Oct 1, 2022 Oct 31, 2022 Revised Total Coliform Rule MON No Yes — — — Resolved Oct 31, 2022 Revised Total Coliform Rule
May 26, 2013 — Other No No — — — Resolved Aug 24, 2015 Ground Water Rule
May 26, 2013 — Other No No — — — Resolved Aug 24, 2015 Ground Water Rule
Apr 1, 2010 Jun 30, 2010 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Gross Alpha, Excl. Radon and U MCL Yes No 20 PCI/L 15 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Gross Alpha, Excl. Radon and U MCL Yes No 20 PCI/L 15 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Gross Alpha, Excl. Radon and U MCL Yes No 20 PCI/L 15 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Gross Alpha, Excl. Radon and U MCL Yes No 20 PCI/L 15 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Gross Alpha, Excl. Radon and U MCL Yes No 20 PCI/L 15 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2010 Mar 31, 2010 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Mar 31, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2010 Mar 31, 2010 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Mar 31, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2010 Mar 31, 2010 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Mar 31, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2010 Mar 31, 2010 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Mar 31, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2010 Mar 31, 2010 Gross Alpha, Excl. Radon and U MCL Yes No 32 PCI/L 15 pCi/L — Resolved Mar 31, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2010 Mar 31, 2010 Gross Alpha, Excl. Radon and U MCL Yes No 32 PCI/L 15 pCi/L — Resolved Mar 31, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2010 Mar 31, 2010 Gross Alpha, Excl. Radon and U MCL Yes No 32 PCI/L 15 pCi/L — Resolved Mar 31, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2010 Mar 31, 2010 Gross Alpha, Excl. Radon and U MCL Yes No 32 PCI/L 15 pCi/L — Resolved Mar 31, 2010 Radionuclides and Revised Rad Rule
Oct 1, 2009 Dec 31, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 29 PCI/L 15 pCi/L — Resolved Dec 31, 2009 Radionuclides and Revised Rad Rule
Oct 1, 2009 Dec 31, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 29 PCI/L 15 pCi/L — Resolved Dec 31, 2009 Radionuclides and Revised Rad Rule
Oct 1, 2009 Dec 31, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 29 PCI/L 15 pCi/L — Resolved Dec 31, 2009 Radionuclides and Revised Rad Rule
Oct 1, 2009 Dec 31, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 29 PCI/L 15 pCi/L — Resolved Dec 31, 2009 Radionuclides and Revised Rad Rule
Oct 1, 2009 Dec 31, 2009 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Dec 31, 2009 Radionuclides and Revised Rad Rule
Oct 1, 2009 Dec 31, 2009 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Dec 31, 2009 Radionuclides and Revised Rad Rule
Oct 1, 2009 Dec 31, 2009 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Dec 31, 2009 Radionuclides and Revised Rad Rule
Oct 1, 2009 Dec 31, 2009 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Dec 31, 2009 Radionuclides and Revised Rad Rule
Jul 1, 2009 Sep 30, 2009 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Sep 30, 2009 Radionuclides and Revised Rad Rule
Jul 1, 2009 Sep 30, 2009 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Sep 30, 2009 Radionuclides and Revised Rad Rule
Jul 1, 2009 Sep 30, 2009 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Sep 30, 2009 Radionuclides and Revised Rad Rule
Jul 1, 2009 Sep 30, 2009 Combined Radium (-226 and -228) MCL Yes No 10 PCI/L 5 pCi/L — Resolved Sep 30, 2009 Radionuclides and Revised Rad Rule
Jul 1, 2009 Sep 30, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 28 PCI/L 15 pCi/L — Resolved Sep 30, 2009 Radionuclides and Revised Rad Rule
Jul 1, 2009 Sep 30, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 28 PCI/L 15 pCi/L — Resolved Sep 30, 2009 Radionuclides and Revised Rad Rule
Jul 1, 2009 Sep 30, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 28 PCI/L 15 pCi/L — Resolved Sep 30, 2009 Radionuclides and Revised Rad Rule
Jul 1, 2009 Sep 30, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 28 PCI/L 15 pCi/L — Resolved Sep 30, 2009 Radionuclides and Revised Rad Rule
Apr 1, 2009 Jun 30, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 25 PCI/L 15 pCi/L — Resolved Jun 30, 2009 Radionuclides and Revised Rad Rule
Apr 1, 2009 Jun 30, 2009 Combined Radium (-226 and -228) MCL Yes No 8 PCI/L 5 pCi/L — Resolved Jun 30, 2009 Radionuclides and Revised Rad Rule
Apr 1, 2009 Jun 30, 2009 Combined Radium (-226 and -228) MCL Yes No 8 PCI/L 5 pCi/L — Resolved Jun 30, 2009 Radionuclides and Revised Rad Rule
Apr 1, 2009 Jun 30, 2009 Combined Radium (-226 and -228) MCL Yes No 8 PCI/L 5 pCi/L — Resolved Jun 30, 2009 Radionuclides and Revised Rad Rule
Apr 1, 2009 Jun 30, 2009 Combined Radium (-226 and -228) MCL Yes No 8 PCI/L 5 pCi/L — Resolved Jun 30, 2009 Radionuclides and Revised Rad Rule
Apr 1, 2009 Jun 30, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 25 PCI/L 15 pCi/L — Resolved Jun 30, 2009 Radionuclides and Revised Rad Rule
Apr 1, 2009 Jun 30, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 25 PCI/L 15 pCi/L — Resolved Jun 30, 2009 Radionuclides and Revised Rad Rule
Apr 1, 2009 Jun 30, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 25 PCI/L 15 pCi/L — Resolved Jun 30, 2009 Radionuclides and Revised Rad Rule
Jan 1, 2009 Mar 31, 2009 Gross Alpha, Excl. Radon and U MCL Yes No 16 PCI/L 15 pCi/L — Resolved Mar 31, 2009 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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