Sioux Falls, SD: 20 Health Violations — 61/100 (2026)
20 ZIP codes · 10 water systems · Updated 2026-06-03
Across water systems in Sioux Falls, safety results are uneven — a portion carry active or recent violations, while others meet federal standards without incident, placing the city in the middle tier for SD.
How Sioux Falls Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Sioux Falls, SD
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
How ZIP codes in Sioux Falls score across all safety grades.
What You Should Know About Sioux Falls Water
- Your city's water systems recorded 40 violations in the past 5 years.
- Average lead level: 0.003 mg/L.
- Estimated remediation: $2,145 per household.
- CDC health risk index: 12.12 — above typical levels.
Who Supplies Your Water in Sioux Falls
Water delivery in Sioux Falls, SD is handled by 3 utilities rather than a single system — drawn from 10 providers in federal records, each filing its own compliance reports and setting its own rates.
Overview
We track water quality and home safety data for 20 ZIP codes in Sioux Falls, South Dakota, covering 10 community water systems serving approximately 204,373 people.
20 of 20 ZIP codes (100%) have recorded EPA violations. 20 health-based violations documented.
Home Safety Score
Average Home Safety Score for Sioux Falls: C (61/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Sioux Falls water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0030 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
- Zone 1 (High): 20 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Revised Total Coliform Rule | Microbiological | 21 | 20 |
| Chlorine residual | Disinfectant | 21 | 20 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 57101 | C | 2 | 1 | Sioux Falls |
| 57103 | C | 2 | 1 | Sioux Falls |
| 57104 | C | 2 | 1 | Sioux Falls |
| 57105 | C | 2 | 1 | Sioux Falls |
| 57106 | C | 2 | 1 | Sioux Falls |
| 57107 | C | 2 | 1 | Sioux Falls |
| 57108 | C | 2 | 1 | Sioux Falls |
| 57109 | C | 2 | 1 | Sioux Falls |
| 57110 | C | 2 | 1 | Sioux Falls |
| 57117 | C | 2 | 1 | Sioux Falls |
All ZIP Codes in Sioux Falls
- 57101 [C] — 2 violations ⚠
- 57103 [C] — 2 violations ⚠
- 57104 [C] — 2 violations ⚠
- 57105 [C] — 2 violations ⚠
- 57106 [C] — 2 violations ⚠
- 57107 [C] — 2 violations ⚠
- 57108 [C] — 2 violations ⚠
- 57109 [C] — 2 violations ⚠
- 57110 [C] — 2 violations ⚠
- 57117 [C] — 2 violations ⚠
- 57118 [C] — 2 violations ⚠
- 57186 [C] — 2 violations ⚠
- 57189 [C] — 2 violations ⚠
- 57192 [C] — 2 violations ⚠
- 57193 [C] — 2 violations ⚠
- 57194 [C] — 2 violations ⚠
- 57195 [C] — 2 violations ⚠
- 57196 [C] — 2 violations ⚠
- 57197 [C] — 2 violations ⚠
- 57198 [C] — 2 violations ⚠
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Health Outcomes in Sioux Falls
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Top Contaminants in Sioux Falls Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Cost Context: What Remediation Means for Sioux Falls Homeowners
Because property values in Sioux Falls comfortably exceed estimated remediation costs, the equity impact here is proportionally small.
Remediation costs in Sioux Falls are relatively low compared to home values. The $1,375–$3,045 estimated range is a small fraction of median property value. Home values are 44% above the South Dakota average.
Lead Exposure Risk for Children in Sioux Falls
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Lead risk in Sioux Falls appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Sioux Falls
Flood risk in Sioux Falls occupies the middle ground: 284 NFIP claims and 40% of local ZIP codes within FEMA flood zones. At that level, the risk pathways connecting flooding to water quality — treatment system stress, well infiltration, distribution backflow — become relevant considerations during significant flood events, even if day-to-day water quality is unaffected by flood history.
Sioux Falls has a moderate flood history with 284 FEMA claims averaging $17,024 per payout. 40% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,145</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Sioux Falls
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Revised Total Coliform Rule can reduce the most common contaminant found in Sioux Falls's water.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
Deep Dive Reports
Detailed analysis for Sioux Falls, SD