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F0/100

FORT THOMPSON WATER SYSTEM — Water Quality Report 2026

Serving 1,357 people · South Dakota

Water Source
Surface Water
County
—
System ID
084690440
Violations
152

Contaminant Test Results

1 contaminant above EPA health goals
ContaminantDetectedLimit (MCL)Status
Lead (90th percentile)
< 0.001 mg/L0.015 mg/LAbove Goal

EPA Violation History

5

Violations (last 5yr)

0

Unresolved

1

Health-Related

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: April 1, 2024 – June 30, 2024Rule: Stage 2 DBPREnforcement: 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: April 1, 2024 – June 30, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 2Resolved

Violation related to Lead and Copper Rule

When: September 8, 2022 – March 17, 2023Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

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

When: January 1, 2022 – December 31, 2022Enforcement: 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: June 1, 2021 – June 30, 2021Rule: 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 FORT THOMPSON WATER SYSTEM

Is FORT THOMPSON WATER SYSTEM water safe to drink?

FORT THOMPSON WATER SYSTEM water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 152 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has FORT THOMPSON WATER SYSTEM detected?

1 contaminants were tested in FORT THOMPSON WATER SYSTEM's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).

Does FORT THOMPSON WATER SYSTEM have any EPA violations?

Yes, FORT THOMPSON WATER SYSTEM has 152 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, TT, MON. 14 are health-based violations.

How many people does FORT THOMPSON WATER SYSTEM serve?

FORT THOMPSON WATER SYSTEM serves approximately 1,357 people, South Dakota.

What type of water does FORT THOMPSON WATER SYSTEM provide?

FORT THOMPSON WATER SYSTEM sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is 084690440.

How does FORT THOMPSON WATER SYSTEM compare to other utilities in South Dakota?

FORT THOMPSON WATER SYSTEM scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our South Dakota state page for a full comparison of water systems.