Lawrence County, South Dakota
6 ZIP codes · Avg score 75/100 · Grade B · Updated 2026-06-04
Compared to state averages, Lawrence County scores well — its 6 ZIP codes sit above the baseline for tap water quality.
How Lawrence County Compares
How Lawrence County Compares
Lawrence County scores 15 points above the South Dakota state average (60/100) and 7 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Lawrence 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: 13 (asthma 10%, diabetes 11.4%)
Estimated additional annual cost per homeowner: $913, driven primarily by flood
Infrastructure: 0.355% avg pipe failure probability, 17% of ZIPs at high risk
59.6% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across Lawrence County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 2 violations. Past 5 years: 4 total (4 health-based).
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
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $913
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
13,674 housing units in Lawrence 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 Lawrence County
Remediation costs are relatively manageable for most homeowners in Lawrence 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 Lawrence County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Lawrence County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Spearfish | 12,193 | 8 |
| 2 | Mountain Plains 2 Homeowners Assoc | 268 | 8 |
| 3 | Saint Onge Sewer & Water Company | 255 | 8 |
| 4 | Lantern Estates | 192 | 8 |
| 5 | Walnut Park | 180 | 8 |
15 total water systems serve Lawrence County.
All ZIP Codes in Lawrence County
6 ZIP codes tracked in Lawrence County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 57732 | Deadwood | 83 | B | 0 | $279K |
| 2 | 57754 | Lead | 83 | B | 0 | $220K |
| 3 | 57793 | Whitewood | 79 | B | 2 | $293K |
| 4 | 57799 | Spearfish | 78 | B | 4 (1 health) | — |
| 5 | 57783 | Spearfish | 74 | B | 4 (1 health) | $332K |
| 6 | 57779 | Saint Onge | 53 | D | 0 | $241K |
Recommended Buyer Guides for Lawrence County
Editorial-only picks, screened against the EPA detections on file.
- Best Lead Paint Test Kits — 59.6% of homes built before 1978
- 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 Lawrence County, South Dakota
Overview
Lawrence County in South Dakota covers 6 ZIP codes with an average Home Safety Score of B (75/100).
3 of 6 ZIP codes have recorded EPA violations. 2 health-based violations have been documented.
← Back to South Dakota water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.