A89/100
SIOUX RURAL WATER SYSTEM — Water Quality Report 2026
Serving 4,012 people · South Dakota
Water Source
Groundwater
County
—
System ID
SD4600866
Violations
4
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
3
Violations (last 5yr)
0
Unresolved
0
Health-Related
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
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
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
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 SIOUX RURAL WATER SYSTEM
Is SIOUX RURAL WATER SYSTEM water safe to drink?
SIOUX RURAL WATER SYSTEM water receives a grade of A (89/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has SIOUX RURAL WATER SYSTEM detected?
31 contaminants were tested in SIOUX RURAL WATER SYSTEM's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does SIOUX RURAL WATER SYSTEM have any EPA violations?
Yes, SIOUX RURAL WATER SYSTEM has 4 EPA violation(s) on record, with the most recent in 2022. Violation types include MR, MCL. 1 are health-based violations.
How many people does SIOUX RURAL WATER SYSTEM serve?
SIOUX RURAL WATER SYSTEM serves approximately 4,012 people, South Dakota. The system provides water to 2 communities: Watertown, Goodwin.
What type of water does SIOUX RURAL WATER SYSTEM provide?
SIOUX RURAL WATER SYSTEM sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is SD4600866.
How does SIOUX RURAL WATER SYSTEM compare to other utilities in South Dakota?
SIOUX RURAL WATER SYSTEM scores 89/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our South Dakota state page for a full comparison of water systems.