US Water Score: A
| Contaminant | Detected Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| Lead |
7.0
|
15 ppb | 1 ppb | Warning |
UCMR5 occurrence results are screening information, not a finding of regulatory compliance or noncompliance. PFAS rules and compliance dates are evolving.
| Compound | Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| PFHxS | 5.6 ppt | 10 ppt | 10 ppt | Below comparison value |
Water Quality Summary
Tap water quality in Rapid City, South Dakota (57701) receives an overall grade of A (Lower record-based concern) with a score of 85 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 8 points below the South Dakota state average of 93. The area is served by 11 water systems providing water to approximately 72,009 people, using surface water and groundwater sources. Testing has found elevated levels of Lead that warrant attention. PFAS testing detected 1 compound, all below the EPA final MCL values used for comparison. Over the past 5 years, water systems here have accumulated 18 violations, including 10 health-based violations.
A score of 85/100 means public water-system records for Rapid City, SD show relatively few concerns in the US Water Score model. This is an internal score, not an EPA safety rating, and it does not guarantee conditions at any specific tap.
Health Information
Lead is a toxic metal that can leach from aging pipes and plumbing fixtures.
Even low levels of lead exposure can cause developmental delays in children, kidney damage, and cardiovascular effects in adults. The EPA action level is 15 ppb, but health experts recommend no safe level of lead in drinking water.
Lead enters water primarily through corrosion of lead service lines, lead solder, and brass fixtures — especially in homes built before 1986.
If lead is detected above 1 ppb, consider using a certified lead-removal filter (NSF/ANSI 53) for drinking and cooking water. Run cold water for 30 seconds before use if water has been sitting in pipes.
Common Questions
Based on public water-system records, Rapid City, South Dakota receives an internal US Water Score grade of A (Lower record-based concern) with a score of 85/100. This indicates relatively few system-level concerns in our model, but it is not an EPA safety rating and does not guarantee tap conditions inside individual homes.
ZIP code 57701 is served by 11 water systems using surface water, groundwater sources, providing water to approximately 72,009 people. Multiple source types mean your water may come from a blend of surface and underground sources.
Lead was reported at 7.0 ppb in public-system records for Rapid City, South Dakota. This is below the currently applicable EPA action level of 15 ppb, but may be above more protective health guidance; EPA's future LCRI action level is 10 ppb. Household plumbing can materially change tap-level exposure, so consider certified filtration and individual tap testing, especially where children are present.
1 PFAS compound were detected in water serving Rapid City, South Dakota, with reported values below the EPA final MCL values used by this site. This comparison is informational: federal compliance timelines and the status of some PFAS standards are still evolving. Activated carbon or reverse osmosis filters can reduce some PFAS when appropriately certified and maintained.
Water systems serving Rapid City, South Dakota have received 18 violations in the last 5 years, including 10 health-based violations. Violations can range from paperwork issues (monitoring & reporting) to serious health-based violations where contaminant levels exceeded safe limits. Review the violation details above for specifics.
Based on detected contaminants (lead, PFAS), residents in Rapid City, South Dakota should consider: Reverse osmosis (RO) system — most effective for PFAS, lead, and other contaminants. Always look for filters with NSF/ANSI certification for the specific contaminants you want to remove.
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