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RONAN CITY OF

Montana — Community Water System — PWSID: MT0000318

System Information

PWSIDMT0000318
System NameRONAN CITY OF
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region08
Serves SchoolNo
WholesalerNo
First ReportedFeb 13, 1979
Last ReportedJan 5, 2026

Location & Contact

StateMontana
CityRONAN
ZIP Code59864
Address207 MAIN STREET SW
OrganizationCITY OF RONAN
Phone406-676-4231

Population & Service

Population Served2,483
Service Connections1,004

Drinking Water Violations (257)

This water system has 257 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 Surface Water Treatment Rule MR No Yes — — — Resolved Apr 30, 2025 Surface Water Treatment Rule
Apr 1, 2025 Apr 30, 2025 Surface Water Treatment Rule MR No Yes — — — Resolved Apr 30, 2025 Surface Water Treatment Rule
Apr 1, 2025 Apr 30, 2025 Surface Water Treatment Rule MR No Yes — — — Resolved Apr 30, 2025 Surface Water Treatment Rule
Mar 1, 2024 Mar 31, 2024 Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2024 Surface Water Treatment Rule
Mar 1, 2024 Mar 31, 2024 Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2024 Surface Water Treatment Rule
Mar 1, 2024 Mar 31, 2024 Surface Water Treatment Rule MR No Yes — — — Resolved Mar 31, 2024 Surface Water Treatment Rule
Dec 1, 2023 Dec 31, 2023 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2023 Revised Total Coliform Rule
Dec 1, 2023 Dec 31, 2023 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2023 Revised Total Coliform Rule
Dec 1, 2023 Dec 31, 2023 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2023 Revised Total Coliform Rule
Jan 1, 2023 Dec 31, 2023 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,1,2-Trichloroethane MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Xylenes, Total MR No Yes — 10 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Xylenes, Total MR No Yes — 10 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Benzene MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 CHLOROBENZENE MR No Yes — 0.1 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Toluene MR No Yes — 1 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 CHLOROBENZENE MR No Yes — 0.1 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 p-Dichlorobenzene MR No Yes — 0.075 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Styrene MR No Yes — 0.1 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Styrene MR No Yes — 0.1 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 CHLOROBENZENE MR No Yes — 0.1 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,1,2-Trichloroethane MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Benzene MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Benzene MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Toluene MR No Yes — 1 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 p-Dichlorobenzene MR No Yes — 0.075 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Xylenes, Total MR No Yes — 10 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 1,1,2-Trichloroethane MR No Yes — 0.005 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 Styrene MR No Yes — 0.1 mg/L — Resolved Nov 30, 2023 Volatile Organic Chemicals
Jan 1, 2023 Dec 31, 2023 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Resolved Nov 30, 2023 Volatile 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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