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RAU SCHOOL DISTRICT NO 21

Montana — Non-Transient Non-Community — PWSID: MT0003089

System Information

PWSIDMT0003089
System NameRAU SCHOOL DISTRICT NO 21
System TypeNon-Transient Non-Community
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region08
Serves SchoolYes
WholesalerNo
First ReportedFeb 7, 1986
Last ReportedJan 5, 2026

Location & Contact

StateMontana
CitySIDNEY
ZIP Code59270
Address12138 CTY RD 350
OrganizationMERRITT, LEIGH
Phone406-482-1088

Population & Service

Population Served80
Service Connections1

Drinking Water Violations (1,091)

This water system has 1,091 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 — Lead and Copper Rule MR No No — TT — Resolved Jun 2, 2025 Lead and Copper Rule
Apr 1, 2025 — Lead and Copper Rule MR No No — TT — Resolved Jun 2, 2025 Lead and Copper Rule
Apr 1, 2025 — Lead and Copper Rule MR No No — TT — Resolved Jun 2, 2025 Lead and Copper Rule
Jul 1, 2024 — Lead and Copper Rule MR No No — TT — Resolved Jul 29, 2024 Lead and Copper Rule
Jul 1, 2024 — Lead and Copper Rule MR No No — TT — Resolved Jul 29, 2024 Lead and Copper Rule
Jul 1, 2024 — Lead and Copper Rule MR No No — TT — Resolved Jul 29, 2024 Lead and Copper Rule
Nov 29, 2023 — Lead and Copper Rule MR No No — TT — Resolved Dec 12, 2023 Lead and Copper Rule
Nov 29, 2023 — Lead and Copper Rule MR No No — TT — Resolved Dec 12, 2023 Lead and Copper Rule
Nov 29, 2023 — Lead and Copper Rule MR No No — TT — Resolved Dec 12, 2023 Lead and Copper 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
Oct 1, 2022 Oct 31, 2022 Revised Total Coliform Rule MON No Yes — — — Resolved Oct 31, 2022 Revised Total Coliform Rule
Jul 1, 2022 — Lead and Copper Rule MR No No — TT — Resolved Jul 25, 2022 Lead and Copper Rule
Jul 1, 2022 — Lead and Copper Rule MR No No — TT — Resolved Jul 25, 2022 Lead and Copper Rule
Jul 1, 2022 — Lead and Copper Rule MR No No — TT — Resolved Jul 25, 2022 Lead and Copper Rule
Sep 2, 2021 — Revised Total Coliform Rule RPT No No — — — Resolved Oct 12, 2021 Revised Total Coliform Rule
Sep 2, 2021 — Revised Total Coliform Rule RPT No No — — — Resolved Oct 12, 2021 Revised Total Coliform Rule
Sep 2, 2021 — Revised Total Coliform Rule RPT No No — — — Resolved Oct 12, 2021 Revised Total Coliform Rule
Sep 1, 2021 Sep 30, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Sep 30, 2021 Revised Total Coliform Rule
Sep 1, 2021 Sep 30, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Sep 30, 2021 Revised Total Coliform Rule
Sep 1, 2021 Sep 30, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Sep 30, 2021 Revised Total Coliform Rule
Feb 1, 2021 Feb 28, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Feb 28, 2021 Revised Total Coliform Rule
Feb 1, 2021 Feb 28, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Feb 28, 2021 Revised Total Coliform Rule
Feb 1, 2021 Feb 28, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Feb 28, 2021 Revised Total Coliform Rule
Jan 1, 2021 Dec 31, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Oct 18, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Dec 31, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Oct 18, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Dec 31, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Oct 18, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Dec 31, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Oct 18, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Dec 31, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Oct 18, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Dec 31, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Oct 18, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Toxaphene MR No Yes — 0.003 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Toxaphene MR No Yes — 0.003 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Methoxychlor MR No Yes — 0.04 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 Endrin MR No Yes — 0.002 mg/L — Resolved Dec 31, 2022 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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