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F0/100

LOWER SIOUX — Water Quality Report 2026

Serving 4,000 people · Minnesota

Water Source
Groundwater
County
—
System ID
055294503
Violations
134

Contaminant Test Results

2 contaminants above EPA health goals
ContaminantDetectedLimit (MCL)Status
Copper (90th percentile)
2.55 mg/L1.30 mg/LOver Limit
Lead (90th percentile)
0.001 mg/L0.015 mg/LAbove Goal

EPA Violation History

6

Violations (last 5yr)

0

Unresolved

0

Health-Related

TIER 3Resolved

Disinfection byproduct treatment technique failure

When: June 26, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Surface water treatment technique failure

When: July 2, 2024 – September 27, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: May 1, 2024 – June 11, 2024Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: May 1, 2024 – May 31, 2024Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2023 – November 15, 2023Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: August 1, 2023 – September 22, 2023Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway

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 LOWER SIOUX

Is LOWER SIOUX water safe to drink?

LOWER SIOUX water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 134 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has LOWER SIOUX detected?

32 contaminants were tested in LOWER SIOUX's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).

Does LOWER SIOUX have any EPA violations?

Yes, LOWER SIOUX has 134 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, RPT, MR.

How many people does LOWER SIOUX serve?

LOWER SIOUX serves approximately 4,000 people, Minnesota.

What type of water does LOWER SIOUX provide?

LOWER SIOUX sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is 055294503.

How does LOWER SIOUX compare to other utilities in Minnesota?

LOWER SIOUX scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Minnesota state page for a full comparison of water systems.