ZipCheckup grade for 57703: C.
A mixed picture - some signals here are worth your attention.
Your top priority: match a filter's certification to the violations (9 health-based violations). Check your ZIP → NSF certified filters
Rapid City, SD (57703): PFAS Detected in Mapped Water Systems - 62/100
EPA data combined for 6 water systems mapped to this ZIP (largest mapped system: Rapid Valley Sanitary District)
Health-based violation records by water system:
- Box Elder (9)
EPA records for the water systems mapped to 57703 in Rapid City, SD contain 10 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 9 are marked health-based.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water EPA records for water systems mapped to this ZIP show 9 health-based violations and 1 non-health-based (since 2021).
- Lead The reported 90th-percentile lead result of 0.003 mg/L is below the EPA action level for water systems; EPA's health goal for lead is zero.
- PFAS At least one PFAS result is above an EPA MCL value (UCMR5 sampling; MCL compliance required from 2029).
- Radon EPA Zone 2 - county-level radon potential, not a home measurement.
- Flood 19 cumulative NFIP claim records. Claim evidence is historical, not current map coverage.
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Safety records for Rapid City (57703) contain exactly one critical finding.
Score Breakdown
Overall Home Safety Score: 62/100
This is the published model score. Component and domain values are shown independently; they are not added together on this page.
Canonical components
Required domains
Coverage: 4 of 4 components and 3 of 3 domains observed.
Model 4.0.0; series home-safety-v4-cross-vertical.
Safety & Health (8) CRITICAL
Your Water System
ZIP code 57703 in Rapid City, South Dakota is mapped to the water system Rapid Valley Sanitary District (EPA ID: SD4600274). This system provides water to approximately 11,408 people from surface water sources.
There are 6 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| Rapid Valley Sanitary District | SD4600274 | 11,408 | Surface water |
| Rapid City | SD4600406 | 72,009 | Surface water |
| Box Elder | SD4600046 | 14,000 | Groundwater |
| Valley Heights Estates Inc. | SD4602361 | 320 | Groundwater |
| Southern Black Hills Water | SD4602309 | 947 | Groundwater |
Other Water Quality Reports in South Dakota
- 57001 (Alcester) - 2 violations recorded for mapped water systems
- 57002 (Aurora)
- 57003 (Baltic)
- 57004 (Beresford) - 2 violations recorded for mapped water systems
- 57005 (Brandon) - 3 violations recorded for mapped water systems
- 57006 (Brookings) - 3 violations recorded for mapped water systems
- 57007 (Brookings)
- 57010 (Burbank)
- 57012 (Canistota)
- 57013 (Canton) - 3 violations recorded for mapped water systems
- 57014 (Centerville) - 2 violations recorded for mapped water systems
- 57015 (Chancellor) - 2 violations recorded for mapped water systems
- 57016 (Chester) - 1 violation recorded for mapped water systems
- 57017 (Colman) - 1 violation recorded for mapped water systems
- 57018 (Colton)
- 57020 (Crooks)
- 57021 (Davis)
- 57022 (Dell Rapids) - 1 violation recorded for mapped water systems
- 57024 (Egan) - 3 violations recorded for mapped water systems
- 57025 (Elk Point)
Nearby Water Quality Reports
- 57701 (Rapid City) - 7 mi - 2 violations recorded for mapped water systems
- 57709 (Rapid City) - 7 mi
- 57719 (Box Elder) - 7 mi - 12 violations recorded for mapped water systems
- 57706 (Ellsworth Afb) - 8 mi - 9 violations recorded for mapped water systems
- 57702 (Rapid City) - 10 mi - 2 violations recorded for mapped water systems
- 57718 (Black Hawk) - 11 mi - 2 violations recorded for mapped water systems
- 57769 (Piedmont) - 16 mi - 2 violations recorded for mapped water systems
- 57751 (Keystone) - 16 mi
- 57744 (Hermosa) - 16 mi
- 57761 (New Underwood) - 18 mi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Rapid Valley Sanitary District (SD4600274) on EPA.gov.
4 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.
Compliance History
PFAS Contamination Detected
PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 57703. One or more compound results are above the level of a federal PFAS MCL with compliance required from 2029.
Detected compounds: PFHxS, PFOS.
Highest measured level: 0.0058 µg/L
Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.
Health Risks from Detected Contaminants
Gross Alpha Particle Activity
High RiskEPA reference value: pCi/L · 5 violations on record
Increased cancer risk from radioactive particles
At-risk groups: long-term residents in areas with uranium or radium-rich geology, people on private wells in western US
Treatment options (verify a product is certified to reduce this contaminant): reverse osmosis, ion exchange, lime softening · Find a filter →
Environmental Hazards (11) MODERATE
Home & Infrastructure (6) MODERATE
Cost & Community (9) HIGH
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Protect Your Home in Rapid City
Based on local data for ZIP 57703, these services may benefit homeowners in your area.
Based on local data for your area. Use the tools below to explore your options.
Home & Flood Insurance
The ZIP code for this report in Rapid City has 19 FEMA flood claims on record. Standard homeowner policies don't cover flood damage - make sure you're protected.
Typical cost: Flood insurance: premiums vary by property and flood zone; request a quote
Check Your Flood Zone (Free)FEMA flood map lookup - see if your property is in a flood zone
Free tip: Check your FEMA flood zone at msc.fema.gov (free lookup)
Service recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.
Frequently Asked Questions
Is the tap water in 57703 safe to drink?
EPA SDWIS records 10 violations since 2021 across the water systems mapped to ZIP 57703 (primary system: Rapid Valley Sanitary District), including 9 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.
Where does 57703's water come from?
The recorded water source for Rapid Valley Sanitary District, a system mapped to ZIP code 57703, is Surface water. This system serves approximately 11,408 people.
How does Rapid City water compare to the national average?
Rapid City's Home Safety Score ranks lower than 80% of U.S. ZIP codes, and lower than 98% of ZIP codes within South Dakota.
How can I get my water tested in Rapid City?
If Rapid Valley Sanitary District supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.
Is lead a concern in 57703 tap water?
The Lead and Copper Rule record selected for 57703 reports a 90th-percentile lead result of 0.003 mg/L for a water system mapped to this ZIP (record date 2024-12-31). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.
What is the radon risk for 57703?
57703 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in Pennington County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.
Are there PFAS (forever chemicals) in 57703's water?
Yes, PFAS have been detected in samples from water systems mapped to 57703. One or more PFAS results are above the level of a federal PFAS MCL with compliance required from 2029. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.
What does the NFIP claim history show for ZIP 57703?
FEMA records contain 19 flood insurance claims filed in ZIP code 57703; the recorded rated-zone value (the most frequent one if there are several claims) is AE, which is claims evidence and may differ from the current FEMA map zone for a property. Claim records do not establish current property risk. Review FEMA's map for the specific property.
How to cite this page
ZipCheckup. (2026). Rapid City, SD (57703): PFAS Detected in Mapped Water Systems - 62/100. https://zipcheckup.com/report/57703/
@misc{zipcheckup-report-57703,
author = {{ZipCheckup}},
title = {{Rapid City, SD (57703): PFAS Detected in Mapped Water Systems - 62/100}},
year = {2026},
url = {https://zipcheckup.com/report/57703/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 57703
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 57701 | Rapid City, SD | 6.6 mi | B | 2 |
| 57709 | Rapid City, SD | 7.3 mi | N/A | 0 |
| 57719 | Box Elder, SD | 7.3 mi | B | 12 |
| 57706 | Ellsworth Afb, SD | 8.3 mi | B | 9 |
| 57702 | Rapid City, SD | 9.6 mi | B | 2 |
| 57718 | Black Hawk, SD | 11.1 mi | B | 2 |
| 57769 | Piedmont, SD | 15.7 mi | B | 2 |
| 57751 | Keystone, SD | 15.8 mi | C | 0 |
| 57744 | Hermosa, SD | 15.9 mi | N/A | 0 |
| 57761 | New Underwood, SD | 18.2 mi | N/A | 0 |
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