C55/100
GREGORY — Water Quality Report 2026
Serving 1,221 people · South Dakota
Water Source
Groundwater
County
—
System ID
SD4600145
Violations
34
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
No violations in the past 5 years
Full EPA compliance since 2019.
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 GREGORY
Is GREGORY water safe to drink?
GREGORY water receives a grade of C (55/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 34 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has GREGORY detected?
27 contaminants were tested in GREGORY's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does GREGORY have any EPA violations?
Yes, GREGORY has 34 EPA violation(s) on record, with the most recent in 2019. Violation types include TT, MR, Other. 2 are health-based violations.
How many people does GREGORY serve?
GREGORY serves approximately 1,221 people, South Dakota. The system provides water to 1 community: Gregory.
What type of water does GREGORY provide?
GREGORY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is SD4600145.
How does GREGORY compare to other utilities in South Dakota?
GREGORY scores 55/100 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.