RYAN DAM WATER SYSTEM
Montana - Community Water System - PWSID: MT0000046
System Information
| PWSID | MT0000046 |
| System Name | RYAN DAM WATER SYSTEM |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 13, 1979 |
| Last Reported | Mar 26, 2026 |
Location & Contact
| State | Montana |
| City | HELENA |
| ZIP Code | 59620-0901 |
| Address | 208 N MONTANA AVE STE 200 |
| Organization | TOLLEFSON, JORDAN |
| Phone | 406-443-8907 |
Population & Service
| Population Served | 230 |
| Service Connections | 14 |
Drinking Water Violations (189)
This water system has 189 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| May 24, 2023 | - | TT | Yes | No | - | - | - | Resolved | Jun 5, 2023 | - | |
| May 24, 2023 | - | TT | Yes | No | - | - | - | Resolved | Jun 5, 2023 | - | |
| May 24, 2023 | - | TT | Yes | No | - | - | - | Resolved | Jun 5, 2023 | - | |
| Apr 20, 2023 | - | MR | No | Yes | - | - | - | Resolved | Apr 25, 2023 | - | |
| Apr 20, 2023 | - | MR | No | Yes | - | - | - | Resolved | Apr 25, 2023 | - | |
| Apr 20, 2023 | - | MR | No | Yes | - | - | - | Resolved | Apr 25, 2023 | - | |
| Apr 20, 2023 | - | MR | No | Yes | - | - | - | Resolved | Apr 25, 2023 | - | |
| Jan 1, 2023 | Dec 31, 2025 | MR | No | Yes | - | 0.060 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2023 | Dec 31, 2025 | MR | No | Yes | - | 0.060 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2023 | Dec 31, 2025 | MR | No | Yes | - | 0.060 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2023 | Dec 31, 2025 | MR | No | Yes | - | 0.080 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2023 | Dec 31, 2025 | MR | No | Yes | - | 0.080 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jan 1, 2023 | Dec 31, 2025 | MR | No | Yes | - | 0.080 mg/L | - | Archived | Dec 31, 2025 | - | |
| Jul 1, 2019 | - | Other | No | No | - | - | - | Resolved | Jul 19, 2019 | - | |
| Jul 1, 2019 | - | Other | No | No | - | - | - | Resolved | Jul 19, 2019 | - | |
| Jul 1, 2019 | Jul 31, 2019 | MR | No | Yes | - | - | - | Resolved | Jul 31, 2019 | - | |
| Jul 1, 2019 | Jul 31, 2019 | MR | No | Yes | - | - | - | Resolved | Jul 31, 2019 | - | |
| Jul 1, 2019 | Jul 31, 2019 | MR | No | Yes | - | - | - | Resolved | Jul 31, 2019 | - | |
| Jul 1, 2019 | Jul 31, 2019 | MR | No | Yes | - | - | - | Resolved | Jul 31, 2019 | - | |
| Jul 1, 2018 | Jul 31, 2018 | MR | No | Yes | - | - | - | Resolved | Jul 31, 2018 | - | |
| Jul 1, 2018 | Jul 31, 2018 | MR | No | Yes | - | - | - | Resolved | Jul 31, 2018 | - | |
| Jul 1, 2018 | Jul 31, 2018 | MR | No | Yes | - | - | - | Resolved | Jul 31, 2018 | - | |
| Jul 1, 2018 | Jul 31, 2018 | MR | No | Yes | - | - | - | Resolved | Jul 31, 2018 | - | |
| Oct 1, 2012 | - | MR | No | No | - | TT | - | Resolved | Oct 15, 2012 | - | |
| Oct 1, 2012 | - | MR | No | No | - | TT | - | Resolved | Oct 15, 2012 | - | |
| Jan 1, 2011 | Jun 30, 2011 | MR | No | No | - | TT | - | Resolved | Feb 28, 2011 | - | |
| Jan 1, 2011 | Jun 30, 2011 | MR | No | No | - | TT | - | Resolved | Feb 28, 2011 | - | |
| Jan 1, 2011 | Jun 30, 2011 | MR | No | No | - | TT | - | Resolved | Feb 28, 2011 | - | |
| Jan 1, 2011 | Jun 30, 2011 | MR | No | No | - | TT | - | Resolved | Feb 28, 2011 | - | |
| Jan 1, 2011 | Dec 31, 2013 | MR | No | Yes | - | 7 MFL | - | Resolved | Jul 24, 2013 | - | |
| Jan 1, 2011 | Dec 31, 2013 | MR | No | Yes | - | 7 MFL | - | Resolved | Jul 24, 2013 | - | |
| Jan 1, 2011 | Dec 31, 2013 | MR | No | Yes | - | 7 MFL | - | Resolved | Jul 24, 2013 | - | |
| Jan 1, 2011 | Jun 30, 2011 | MR | No | No | - | TT | - | Resolved | Feb 28, 2011 | - | |
| Jan 1, 2011 | Jun 30, 2011 | MR | No | No | - | TT | - | Resolved | Feb 28, 2011 | - | |
| Dec 1, 2008 | Dec 31, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Dec 31, 2008 | - | |
| Dec 1, 2008 | Dec 31, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Dec 31, 2008 | - | |
| Dec 1, 2008 | Dec 31, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Dec 31, 2008 | - | |
| Dec 1, 2008 | Dec 31, 2008 | MR | No | No | - | 5% of samples | - | Resolved | Dec 31, 2008 | - | |
| Jul 1, 2008 | Jul 31, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2008 | - | |
| Jul 1, 2008 | Jul 31, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2008 | - | |
| Jul 1, 2008 | - | Other | No | No | - | - | - | Resolved | Aug 15, 2008 | - | |
| Jul 1, 2008 | - | Other | No | No | - | - | - | Resolved | Aug 15, 2008 | - | |
| Jul 1, 2008 | Jul 31, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2008 | - | |
| Jul 1, 2008 | Jul 31, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2008 | - | |
| Jul 1, 2008 | - | Other | No | No | - | - | - | Resolved | Aug 15, 2008 | - | |
| Jul 1, 2008 | Jul 31, 2008 | MCL | Yes | No | - | 5% of samples | - | Resolved | Jul 31, 2008 | - | |
| Jan 1, 2008 | Dec 31, 2016 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Dec 31, 2016 | - | |
| Jan 1, 2008 | Dec 31, 2016 | MR | No | Yes | - | 15 pCi/L | - | Resolved | Dec 31, 2016 | - | |
| Jan 1, 2008 | Dec 31, 2016 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Dec 31, 2016 | - | |
| Jan 1, 2008 | Dec 31, 2016 | MR | No | Yes | - | 5 pCi/L | - | Resolved | Dec 31, 2016 | - |
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.