HAMILTON CITY OF
Montana — Community Water System — PWSID: MT0000234
System Information
| PWSID | MT0000234 |
| System Name | HAMILTON CITY OF |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 13, 1979 |
| Last Reported | Jan 5, 2026 |
Location & Contact
| State | Montana |
| City | HAMILTON |
| ZIP Code | 59840 |
| Address | 920 NEW YORK AVE |
| Organization | LEWIS, STEPHANIE |
| Phone | 406-363-6717 |
Population & Service
| Population Served | 5,585 |
| Service Connections | 2,443 |
Drinking Water Violations (17)
This water system has 17 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec 30, 2017 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Oct 19, 2020 | Lead and Copper Rule |
| Dec 30, 2017 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Oct 19, 2020 | Lead and Copper Rule |
| Jan 1, 2012 | Dec 31, 2012 | Nitrate-Nitrite | MR | No | Yes | — | — | — | Resolved | Mar 12, 2012 | Nitrate Rule |
| Jan 1, 2012 | Dec 31, 2012 | Nitrate-Nitrite | MR | No | Yes | — | — | — | Resolved | Mar 12, 2012 | Nitrate Rule |
| Jan 1, 2012 | Dec 31, 2012 | Nitrate-Nitrite | MR | No | Yes | — | — | — | Resolved | Mar 12, 2012 | Nitrate Rule |
| Dec 1, 2011 | Dec 31, 2011 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2011 | Total Coliform Rule |
| Dec 1, 2011 | Dec 31, 2011 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2011 | Total Coliform Rule |
| Dec 1, 2011 | Dec 31, 2011 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2011 | Total Coliform Rule |
| Jul 1, 2006 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Feb 15, 2007 | Consumer Confidence Rule |
| Jul 1, 2006 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Feb 15, 2007 | Consumer Confidence Rule |
| Oct 1, 2001 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Feb 4, 2004 | Lead and Copper Rule |
| Jul 1, 2001 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Feb 4, 2004 | Lead and Copper Rule |
| Jan 1, 1996 | Dec 31, 1996 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 1996 | Nitrate Rule |
| Jan 1, 1994 | Dec 31, 1994 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 1994 | Nitrate Rule |
| Jul 1, 1993 | Dec 31, 1993 | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Dec 31, 1993 | Lead and Copper Rule |
| Jul 1, 1993 | Dec 31, 1993 | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Dec 31, 1993 | Lead and Copper Rule |
| Jan 1, 1993 | Dec 31, 1993 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 1993 | Nitrate 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.