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MNIHNAPA WATER SYSTEM

Montana — Community Water System — PWSID: 083090047

System Information

PWSID083090047
System NameMNIHNAPA WATER SYSTEM
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeNative American
EPA Region08
Serves SchoolNo
WholesalerNo
First ReportedJun 24, 1991
Last ReportedNov 17, 2025

Location & Contact

StateMontana
CityHARLEM
ZIP Code59526
Address164 Agency Main Street
OrganizationRAMONE, KASEY
Phone406-353-8313

Population & Service

Population Served220
Service Connections51

Drinking Water Violations (166)

This water system has 166 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, 2021 Mar 31, 2021 Radium-228 MR No Yes — — — Resolved Mar 31, 2021 Radionuclides and Revised Rad Rule
Jan 1, 2021 Mar 31, 2021 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Mar 31, 2021 Radionuclides and Revised Rad Rule
Jan 1, 2021 Mar 31, 2021 Radium-226 MR No Yes — — — Resolved Mar 31, 2021 Radionuclides and Revised Rad Rule
Jan 1, 2021 Mar 31, 2021 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Mar 31, 2021 Radionuclides and Revised Rad Rule
Jan 1, 2021 Mar 31, 2021 Combined Uranium MR No Yes — 30 ug/L — Resolved Mar 31, 2021 Radionuclides and Revised Rad Rule
Oct 1, 2020 Dec 31, 2020 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Dec 31, 2020 Radionuclides and Revised Rad Rule
Oct 1, 2020 Dec 31, 2020 Radium-228 MR No Yes — — — Resolved Dec 31, 2020 Radionuclides and Revised Rad Rule
Oct 1, 2020 Dec 31, 2020 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Dec 31, 2020 Radionuclides and Revised Rad Rule
Oct 1, 2020 Dec 31, 2020 Radium-226 MR No Yes — — — Resolved Dec 31, 2020 Radionuclides and Revised Rad Rule
Oct 1, 2020 Dec 31, 2020 Combined Uranium MR No Yes — 30 ug/L — Resolved Dec 31, 2020 Radionuclides and Revised Rad Rule
Aug 27, 2020 — E. COLI MR No Yes — — — Resolved Sep 14, 2020 Ground Water Rule
Aug 1, 2020 Aug 31, 2020 Revised Total Coliform Rule MCL Yes No — — — Archived Aug 31, 2020 Revised Total Coliform Rule
Aug 1, 2020 Aug 31, 2020 Revised Total Coliform Rule MCL Yes No — — — Archived Aug 31, 2020 Revised Total Coliform Rule
Aug 1, 2020 Aug 31, 2020 Revised Total Coliform Rule MCL Yes No — — — Archived Aug 31, 2020 Revised Total Coliform Rule
Jul 1, 2020 — Lead and Copper Rule MR No No — TT — Resolved Dec 15, 2021 Lead and Copper Rule
Apr 1, 2020 Jun 30, 2020 2,4-D MR No Yes — 0.07 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 Picloram MR No Yes — 0.5 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 Pentachlorophenol MR No Yes — 0.001 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 Radium-228 MR No Yes — — — Resolved Feb 27, 2020 Radionuclides and Revised Rad Rule
Apr 1, 2020 Jun 30, 2020 Dalapon MR No Yes — 0.2 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 Carbofuran MR No Yes — 0.04 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 Radium-226 MR No Yes — — — Resolved Feb 27, 2020 Radionuclides and Revised Rad Rule
Apr 1, 2020 Jun 30, 2020 ETHYLENE DIBROMIDE MR No Yes — 0.00005 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 Diquat MR No Yes — 0.02 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 Dinoseb MR No Yes — 0.007 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 2,4,5-TP MR No Yes — 0.05 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 OXAMYL MR No Yes — 0.2 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 Endothall MR No Yes — 0.1 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 Gross Alpha, Excl. Radon and U MR No Yes — 15 pCi/L — Resolved Feb 27, 2020 Radionuclides and Revised Rad Rule
Apr 1, 2020 Jun 30, 2020 1,2-DIBROMO-3-CHLOROPROPANE MR No Yes — 0.0002 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 Glyphosate MR No Yes — 0.7 mg/L — Resolved Jun 30, 2020 Synthetic Organic Chemicals
Apr 1, 2020 Jun 30, 2020 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Feb 27, 2020 Radionuclides and Revised Rad Rule
Apr 1, 2020 Jun 30, 2020 Combined Uranium MR No Yes — 30 ug/L — Resolved Feb 27, 2020 Radionuclides and Revised Rad Rule
Jul 1, 2019 Sep 30, 2019 Heptachlor MR No Yes — 0.0004 mg/L — Resolved Sep 30, 2019 Synthetic Organic Chemicals
Jul 1, 2019 Sep 30, 2019 Cadmium MR No Yes — 0.005 mg/L — Resolved Sep 30, 2019 Inorganic Chemicals
Jul 1, 2019 Sep 30, 2019 Chromium MR No Yes — 0.1 mg/L — Resolved Sep 30, 2019 Inorganic Chemicals
Jul 1, 2019 Sep 30, 2019 Diquat MR No Yes — 0.02 mg/L — Resolved Sep 30, 2019 Synthetic Organic Chemicals
Jul 1, 2019 Sep 30, 2019 Barium MR No Yes — 2 mg/L — Resolved Sep 30, 2019 Inorganic Chemicals
Jul 1, 2019 Sep 30, 2019 Dalapon MR No Yes — 0.2 mg/L — Resolved Sep 30, 2019 Synthetic Organic Chemicals
Jul 1, 2019 Sep 30, 2019 Asbestos MR No Yes — 7 MFL — Resolved Sep 30, 2019 Inorganic Chemicals
Jul 1, 2019 Sep 30, 2019 Mercury MR No Yes — 0.002 mg/L — Resolved Sep 30, 2019 Inorganic Chemicals
Jul 1, 2019 Sep 30, 2019 Nickel MR No Yes — — — Resolved Sep 30, 2019 Inorganic Chemicals
Jul 1, 2019 Sep 30, 2019 Antimony, Total MR No Yes — 0.006 mg/L — Resolved Sep 30, 2019 Inorganic Chemicals
Jul 1, 2019 Sep 30, 2019 Heptachlor epoxide MR No Yes — 0.0002 mg/L — Resolved Sep 30, 2019 Synthetic Organic Chemicals
Jul 1, 2019 Sep 30, 2019 Endrin MR No Yes — 0.002 mg/L — Resolved Sep 30, 2019 Synthetic Organic Chemicals
Jul 1, 2019 Sep 30, 2019 Total Polychlorinated Biphenyls (PCB) MR No Yes — 0.0005 mg/L — Resolved Sep 30, 2019 Synthetic Organic Chemicals
Jul 1, 2019 Sep 30, 2019 ETHYLENE DIBROMIDE MR No Yes — 0.00005 mg/L — Resolved Sep 30, 2019 Synthetic Organic Chemicals
Jul 1, 2019 Sep 30, 2019 Di(2-ethylhexyl) adipate MR No Yes — 0.4 mg/L — Resolved Sep 30, 2019 Synthetic Organic Chemicals
Jul 1, 2019 Sep 30, 2019 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Sep 30, 2019 Synthetic Organic Chemicals
Jul 1, 2019 Sep 30, 2019 Atrazine MR No Yes — 0.003 mg/L — Resolved Sep 30, 2019 Synthetic Organic 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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