D26/100
MADISON — Water Quality Report 2026
Serving 6,191 people · South Dakota
Water Source
Groundwater
County
—
System ID
SD4600199
Violations
35
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2013.
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 MADISON
Is MADISON water safe to drink?
MADISON water receives a grade of D (26/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 35 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has MADISON detected?
31 contaminants were tested in MADISON's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does MADISON have any EPA violations?
Yes, MADISON has 35 EPA violation(s) on record, with the most recent in 2013. Violation types include Other, MCL, MR. 9 are health-based violations.
How many people does MADISON serve?
MADISON serves approximately 6,191 people, South Dakota. The system provides water to 1 community: Madison.
What type of water does MADISON provide?
MADISON sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is SD4600199.
How does MADISON compare to other utilities in South Dakota?
MADISON scores 26/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our South Dakota state page for a full comparison of water systems.