A91/100
RAPID CITY — Water Quality Report 2026
Serving 72,009 people · South Dakota
Water Source
Surface Water
County
—
System ID
SD4600406
Violations
6
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.006 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2002.
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 RAPID CITY
Is RAPID CITY water safe to drink?
RAPID CITY water receives a grade of A (91/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has RAPID CITY detected?
69 contaminants were tested in RAPID CITY's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does RAPID CITY have any EPA violations?
Yes, RAPID CITY has 6 EPA violation(s) on record, with the most recent in 2002. Violation types include MR.
How many people does RAPID CITY serve?
RAPID CITY serves approximately 72,009 people, South Dakota. The system provides water to 1 community: Rapid City.
What type of water does RAPID CITY provide?
RAPID CITY 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 SD4600406.
How does RAPID CITY compare to other utilities in South Dakota?
RAPID CITY scores 91/100 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.