B70/100
RAPID VALLEY SANITARY DISTRICT — Water Quality Report 2026
Serving 11,408 people · South Dakota
Water Source
Surface Water
County
—
System ID
SD4600274
Violations
7
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOS | 0.006 µg/L | 0.004 µg/L | Over Limit |
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 2007.
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 VALLEY SANITARY DISTRICT
Is RAPID VALLEY SANITARY DISTRICT water safe to drink?
RAPID VALLEY SANITARY DISTRICT water receives a grade of B (70/100), which is considered good. Out of 51 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has RAPID VALLEY SANITARY DISTRICT detected?
51 contaminants were tested in RAPID VALLEY SANITARY DISTRICT's water. Notable contaminants include PFOS, Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does RAPID VALLEY SANITARY DISTRICT have any EPA violations?
Yes, RAPID VALLEY SANITARY DISTRICT has 7 EPA violation(s) on record, with the most recent in 2007. Violation types include MCL, TT, MR. 3 are health-based violations.
How many people does RAPID VALLEY SANITARY DISTRICT serve?
RAPID VALLEY SANITARY DISTRICT serves approximately 11,408 people, South Dakota. The system provides water to 1 community: Rapid City.
What type of water does RAPID VALLEY SANITARY DISTRICT provide?
RAPID VALLEY SANITARY DISTRICT 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 SD4600274.
How does RAPID VALLEY SANITARY DISTRICT compare to other utilities in South Dakota?
RAPID VALLEY SANITARY DISTRICT scores 70/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our South Dakota state page for a full comparison of water systems.