Brown County, South Dakota
15 ZIP codes · Avg score 66/100 · Grade C · Updated
ZipCheckup grade for Brown County: C.
A mixed picture - some signals here are worth your attention.
For most households in Brown County, the 15 tracked ZIP codes show adequate but uneven water quality.
How Brown County Compares
How Brown County Compares
Brown County scores 3 points below the South Dakota state average (69/100) and 7 points below the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
ZIP Code Risk Map
Water Quality Map: Brown County, South Dakota
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.5 (asthma 9.7%, diabetes 11.2%)
Estimated additional annual cost per homeowner: $1,058, driven primarily by flood
71.4% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Brown County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 6 violations. Past 5 years: 13 total (13 health-based). Health-based violations are rising versus the prior 2-year window - worth closer monitoring.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,058
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
18,118 housing units in Brown County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Brown County
Remediation costs are relatively manageable for most homeowners in Brown County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Brown County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Brown County
6 community water systems serving Brown County.
- C
- C
- C
- C
- C
- C
Systems with the most violations in Brown County
4 water systems with recorded EPA violations.
- C
- C
- C
- C
All ZIP Codes in Brown County
15 ZIP codes tracked in Brown County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 57427 | Bath | 67 | C | 0 | $384K |
| 2 | 57433 | Columbia | 67 | C | 0 | — |
| 3 | 57434 | Conde | 67 | C | 0 | — |
| 4 | 57441 | Frederick | 67 | C | 0 | $116K |
| 5 | 57445 | Groton | 67 | C | 0 | $185K |
| 6 | 57446 | Hecla | 67 | C | 0 | — |
| 7 | 57449 | Houghton | 67 | C | 0 | — |
| 8 | 57460 | Mansfield | 67 | C | 0 | $272K |
| 9 | 57474 | Stratford | 67 | C | 0 | $216K |
| 10 | 57479 | Warner | 67 | C | 0 | $230K |
| 11 | 57481 | Westport | 67 | C | 0 | $201K |
| 12 | 57401 | Aberdeen | 55 | C | 20 (10 health) | $216K |
| 13 | 57402 | Aberdeen | — | — | — | |
| 14 | 57426 | Barnard | — | — | $257K | |
| 15 | 57439 | Ferney | — | — | — |
Recommended Buyer Guides for Brown County
While many sites publish identical guide lists across every county they cover, the selection here changes by location - driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Lead Paint Test Kits — 71.4% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Brown County, South Dakota
Overview
Brown County in South Dakota covers 15 tracked ZIP records with an average Home Safety Score of C (66/100) across 12 scored records.
1 of 12 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 10 health-based violations appear in the available health breakdown.
← Back to South Dakota Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.