CASTLE ROCK FAS 420
Montana - Transient Non-Community - PWSID: MT0042443
System Information
| PWSID | MT0042443 |
| System Name | CASTLE ROCK FAS 420 |
| System Type | Transient Non-Community |
| Water Source | Ground Water |
| Activity Status | Non-Inventory |
| Owner Type | State |
| EPA Region | 08 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Jul 1, 1987 |
| Last Reported | Mar 26, 2026 |
Location & Contact
| State | Montana |
| City | BILLINGS |
| ZIP Code | 59105 |
| Address | FISH WILDLIFE AND PARKS |
| Organization | - |
| Phone | 406-247-2966 |
Population & Service
| Population Served | 25 |
| Service Connections | 1 |
Drinking Water Violations (5)
This water system has 5 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, 2001 | Jun 30, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Jun 30, 2001 | - | |
| Apr 1, 2001 | Jun 30, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Jun 30, 2001 | - | |
| Apr 1, 2001 | Jun 30, 2001 | MR | No | No | - | 5% of samples | - | Resolved | Jun 30, 2001 | - | |
| Jul 1, 1999 | Sep 30, 1999 | MR | No | No | - | 5% of samples | - | Archived | Sep 30, 1999 | - | |
| Aug 1, 1995 | Aug 31, 1995 | MR | No | No | - | 5% of samples | - | Archived | Aug 31, 1995 | - |
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.