A99/100
Cottage Grove — Water Quality Report 2026
Serving 39,712 people · Minnesota
Water Source
Groundwater
County
—
System ID
MN1820004
Violations
0
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
cobalt | 11.10 µg/L | — | Above Goal |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
This system has a clean compliance history.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About Cottage Grove
Is Cottage Grove water safe to drink?
Cottage Grove water receives a grade of A (99/100), which is considered excellent. Out of 66 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has Cottage Grove detected?
66 contaminants were tested in Cottage Grove's water. Notable contaminants include Lead (90th percentile), cobalt. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does Cottage Grove have any EPA violations?
No, Cottage Grove has zero EPA violations on record. This indicates consistent compliance with federal drinking water standards.
How many people does Cottage Grove serve?
Cottage Grove serves approximately 39,712 people, Minnesota.
What type of water does Cottage Grove provide?
Cottage Grove sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MN1820004.
How does Cottage Grove compare to other utilities in Minnesota?
Cottage Grove scores 99/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Minnesota state page for a full comparison of water systems.