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HERMOSA-OLD SYSTEM

South Dakota — Community Water System — PWSID: SD4600154

System Information

PWSIDSD4600154
System NameHERMOSA-OLD SYSTEM
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
CityHERMOSA
ZIP Code57744
AddressPO BOX 298
OrganizationHERMOSA-OLD SYSTEM
Phone6052554291

Population & Service

Population Served420
Service Connections277

Drinking Water Violations (18)

This water system has 18 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
Apr 1, 2025 Apr 30, 2025 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2025 Revised Total Coliform Rule
Apr 1, 2025 Apr 30, 2025 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2025 Revised Total Coliform Rule
Oct 1, 2021 Dec 31, 2021 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Dec 31, 2021 Radionuclides and Revised Rad Rule
Oct 1, 2021 Dec 31, 2021 Combined Uranium MR No Yes — 30 ug/L — Resolved Dec 31, 2021 Radionuclides and Revised Rad Rule
Oct 1, 2021 Dec 31, 2021 Combined Uranium MR No Yes — 30 ug/L — Resolved Dec 31, 2021 Radionuclides and Revised Rad Rule
Oct 1, 2021 Dec 31, 2021 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Dec 31, 2021 Radionuclides and Revised Rad Rule
Oct 1, 2021 Dec 31, 2021 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Dec 31, 2021 Radionuclides and Revised Rad Rule
Feb 1, 2010 — Stage 1 Disinfectants and Disinfection Byproducts Rule TT Yes No — — — Resolved Mar 24, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Feb 1, 2010 — Stage 1 Disinfectants and Disinfection Byproducts Rule TT Yes No — — — Resolved Mar 24, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2006 Mar 31, 2006 Chlorine MR No Yes — 4.0 mg/L — Resolved Mar 31, 2006 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2006 Mar 31, 2006 Chlorine MR No Yes — 4.0 mg/L — Resolved Mar 31, 2006 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2005 Dec 31, 2005 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2005 Dec 31, 2005 Chlorine MR No Yes — 4.0 mg/L — Resolved Dec 31, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2005 Sep 30, 2005 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2005 Sep 30, 2005 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 1995 Jul 31, 1995 Coliform (TCR) MR No Yes — 5% of samples — Archived Jul 31, 1995 Total Coliform 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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