Dennison
Minnesota — Community Water System — PWSID: MN1250021
System Information
| PWSID | MN1250021 |
| System Name | Dennison |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 05 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Feb 7, 1983 |
| Last Reported | Feb 25, 2026 |
Location & Contact
| State | Minnesota |
| City | Dennison |
| ZIP Code | 55018 |
| Address | Dennison City Hall |
| Organization | Dennison City Council |
| Phone | 5076457732 |
Population & Service
| Population Served | 220 |
| Service Connections | 93 |
Drinking Water Violations (37)
This water system has 37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 1, 2025 | Dec 31, 2025 | MCL | Yes | No | 10.7 PCI/L | 15 pCi/L | — | Archived | Dec 31, 2025 | — | |
| Oct 1, 2025 | Dec 31, 2025 | MCL | Yes | No | 10.7 PCI/L | 15 pCi/L | — | Archived | Dec 31, 2025 | — | |
| Oct 1, 2025 | Dec 31, 2025 | MCL | Yes | No | 10.7 PCI/L | 15 pCi/L | — | Archived | Dec 31, 2025 | — | |
| Oct 1, 2025 | Dec 31, 2025 | MCL | Yes | No | 10.7 PCI/L | 15 pCi/L | — | Archived | Dec 31, 2025 | — | |
| Oct 1, 2025 | Dec 31, 2025 | MCL | Yes | No | 10.7 PCI/L | 15 pCi/L | — | Archived | Dec 31, 2025 | — | |
| Jul 1, 2025 | Sep 30, 2025 | MCL | Yes | No | 9.5 PCI/L | 15 pCi/L | — | Archived | Sep 30, 2025 | — | |
| Jul 1, 2025 | Sep 30, 2025 | MCL | Yes | No | 9.5 PCI/L | 15 pCi/L | — | Archived | Sep 30, 2025 | — | |
| Jul 1, 2025 | Sep 30, 2025 | MCL | Yes | No | 9.5 PCI/L | 15 pCi/L | — | Archived | Sep 30, 2025 | — | |
| Jul 1, 2025 | Sep 30, 2025 | MCL | Yes | No | 9.5 PCI/L | 15 pCi/L | — | Archived | Sep 30, 2025 | — | |
| Apr 1, 2025 | Jun 30, 2025 | MCL | Yes | No | 15.7 PCI/L | 15 pCi/L | — | Archived | Jun 30, 2025 | — | |
| Apr 1, 2025 | Jun 30, 2025 | MCL | Yes | No | 15.7 PCI/L | 15 pCi/L | — | Archived | Jun 30, 2025 | — | |
| Apr 1, 2025 | Jun 30, 2025 | MCL | Yes | No | 15.7 PCI/L | 15 pCi/L | — | Archived | Jun 30, 2025 | — | |
| Apr 1, 2025 | Jun 30, 2025 | MCL | Yes | No | 15.7 PCI/L | 15 pCi/L | — | Archived | Jun 30, 2025 | — | |
| Apr 1, 2025 | Jun 30, 2025 | MCL | Yes | No | 15.7 PCI/L | 15 pCi/L | — | Archived | Jun 30, 2025 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MON | No | Yes | — | — | — | Resolved | Dec 31, 2022 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MON | No | Yes | — | — | — | Resolved | Dec 31, 2022 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MON | No | Yes | — | — | — | Resolved | Dec 31, 2022 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MON | No | Yes | — | — | — | Resolved | Dec 31, 2022 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MON | No | Yes | — | — | — | Resolved | Dec 31, 2022 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 4.0 mg/L | — | Archived | Dec 31, 2022 | — | |
| Oct 1, 2022 | Dec 31, 2022 | MR | No | Yes | — | 4.0 mg/L | — | Archived | Dec 31, 2022 | — | |
| Oct 1, 2000 | Dec 31, 2000 | MCL | Yes | No | 18.6 | 15 pCi/L | — | Resolved | Dec 31, 2000 | — | |
| Oct 1, 2000 | Dec 31, 2000 | MCL | Yes | No | 18.6 | 15 pCi/L | — | Resolved | Dec 31, 2000 | — | |
| Oct 1, 2000 | Dec 31, 2000 | MCL | Yes | No | 18.6 | 15 pCi/L | — | Resolved | Dec 31, 2000 | — | |
| Oct 1, 2000 | Dec 31, 2000 | MCL | Yes | No | 18.6 | 15 pCi/L | — | Resolved | Dec 31, 2000 | — | |
| Oct 1, 2000 | Dec 31, 2000 | MCL | Yes | No | 18.6 | 15 pCi/L | — | Resolved | Dec 31, 2000 | — | |
| Oct 1, 2000 | Dec 31, 2000 | MCL | Yes | No | 18.6 | 15 pCi/L | — | Resolved | Dec 31, 2000 | — | |
| Oct 1, 2000 | Dec 31, 2000 | MCL | Yes | No | 18.6 | 15 pCi/L | — | Resolved | Dec 31, 2000 | — | |
| Oct 1, 2000 | Dec 31, 2000 | MCL | Yes | No | 18.6 | 15 pCi/L | — | Resolved | Dec 31, 2000 | — | |
| Jan 1, 1994 | Dec 31, 1994 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 1994 | — | |
| Jan 1, 1994 | Dec 31, 1994 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 1994 | — | |
| Jan 1, 1994 | Dec 31, 1994 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 1994 | — | |
| Jan 1, 1994 | Dec 31, 1994 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 1994 | — | |
| Jan 1, 1994 | Dec 31, 1994 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 1994 | — | |
| — | — | — | No | No | — | — | — | — | — | — | |
| — | — | — | No | No | — | — | — | — | — | — | |
| — | — | — | No | No | — | — | — | — | — | — |
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.