C50/100
CUSTER — Water Quality Report 2026
Serving 1,919 people · South Dakota
Water Source
Groundwater
County
—
System ID
SD4600101
Violations
39
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.50 mg/L | 1.30 mg/L | Over Limit |
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 1998.
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 CUSTER
Is CUSTER water safe to drink?
CUSTER water receives a grade of C (50/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 39 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CUSTER detected?
2 contaminants were tested in CUSTER's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does CUSTER have any EPA violations?
Yes, CUSTER has 39 EPA violation(s) on record, with the most recent in 1998. Violation types include MR.
How many people does CUSTER serve?
CUSTER serves approximately 1,919 people, South Dakota. The system provides water to 1 community: Custer.
What type of water does CUSTER provide?
CUSTER sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is SD4600101.
How does CUSTER compare to other utilities in South Dakota?
CUSTER scores 50/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our South Dakota state page for a full comparison of water systems.