Public water system record
Dennison
Serves Dennison, Goodhue County, MN · 220 people served
Federal records show 3 health-based violations and 2 monitoring/reporting issues for Dennison in the last ten years. The most serious issue in this window was a Gross Alpha, Excl. Radon and U violation that EPA lists as archived, not resolved.
System profile
- Health-based violations, last 10 years
- 3
- Resolved
- 0
- Unresolved
- 0
- Archived by EPA
- 3
- Any acute record
- No
- Monitoring issues, last 10 years
- 2
Key facts
- Dennison draws water from 1 well.
- Highest measured level in the last 10 years: Gross Alpha, Excl. Radon and U, 15.7 pCi/L, federal limit 15 pCi/L (at or just above the limit), 2025.
- Most recent formal enforcement: compliance order (no penalty) by Minnesota, January 2026.
- Record on file since 1994, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 97 service lines.
Check whether Dennison serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
340 | Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
340 | Jul 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 15.7 pCi/L, federal limit 15 pCi/L (at or just above the limit)
|
340 | Apr 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Chlorine
Monitoring and reporting
|
Oct 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Revised Total Coliform Rule
Monitoring violation
|
Oct 1, 2022 | Resolved |
Full record since 1994
EPA's records for Dennison go back to 1994. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 1 monitoring or reporting violation.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 1 |
| 2000s | 1 | 0 |
| 2020s | 3 | 2 |
Most recent health-based violation before October 19, 2016: Gross Alpha, Excl. Radon and U, began October 2000, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Oct 1, 2000 | Resolved |
Enforcement actions
Minnesota regulators took 1 formal enforcement action against Dennison in 2026, filed as 3 records in EPA's data. The most recent was a compliance order (no penalty) in January 2026.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Jan 2, 2026 | Minnesota | Compliance order (no penalty) | 3 violations (3 health-based): Gross Alpha, Excl. Radon and U |
What the violations mean
Gross Alpha, Excl. Radon and U
3 incidentsTest results for Gross Alpha, Excl. Radon and U were above the federal limit (a maximum contaminant level violation).
The utility had to notify customers about each of these violations.
Where the water comes from
Dennison draws water from 1 well.
Annual water quality report
Dennison must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Dennison for a copy.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Minnesota.
Certified drinking water labs by state EPA guidance for private wells