A88/100
Rock County Rural Water System — Water Quality Report 2026
Serving 2,919 people · Minnesota
Water Source
Purchased Surface Water
County
—
System ID
MN1670007
Violations
4
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.61 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2015.
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 Rock County Rural Water System
Is Rock County Rural Water System water safe to drink?
Rock County Rural Water System water receives a grade of A (88/100), which is considered excellent. Out of 2 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has Rock County Rural Water System detected?
2 contaminants were tested in Rock County Rural Water System's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does Rock County Rural Water System have any EPA violations?
Yes, Rock County Rural Water System has 4 EPA violation(s) on record, with the most recent in 2015. Violation types include MR.
How many people does Rock County Rural Water System serve?
Rock County Rural Water System serves approximately 2,919 people, Minnesota.
What type of water does Rock County Rural Water System provide?
Rock County Rural Water System sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is MN1670007.
How does Rock County Rural Water System compare to other utilities in Minnesota?
Rock County Rural Water System scores 88/100 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.