Isabel, SD Water Safety: 83/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
Public water monitoring in Isabel shows a safety record well above the SD median — health-based violations are isolated exceptions rather than recurring patterns, the city's systems have stayed compliant across recent reporting cycles, and no cluster of recurring exceedances appears in any single service area.
How Isabel Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Isabel Water
- Average lead level: 0.002 mg/L.
- Homes built before 1986: 83% — older plumbing may contain lead solder.
- Estimated remediation: $400 per household.
- CDC health risk index: 16.91 — above typical levels.
Who Supplies Your Water in Isabel
Across Isabel, SD, residential water comes from 2 primary utilities rather than a single consolidated provider. Each system operates independently — managing its own distribution infrastructure, rate schedules, and EPA compliance filings. Federal records track 2 water systems in the area, with these top providers accounting for the majority of residential connections.
Overview
We track water quality and home safety data for 1 ZIP code in Isabel, South Dakota (population ~421), covering 2 community water systems serving approximately 2,335 people region-wide.
No EPA violations recorded across any ZIP codes in Isabel — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Isabel: B (83/100)
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
Isabel water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0020 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 57633 | B | Tri-county Rural Water System | 2,190 |
All ZIP Codes in Isabel
- 57633 [B]
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 Isabel
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
Housing & Infrastructure in Isabel
With 83% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Pre-1986 plumbing is not a rare legacy case in Isabel — it's the dominant profile. The median build year of 1963 indicates a housing stock where lead-soldered copper joints are a common structural feature of residences across the city.
Over half of homes in Isabel were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Isabel Homeowners
The household financial picture for Isabel homeowners is proportionally favorable — addressing documented issues claims a small slice of equity, and the cost-to-value ratio puts this area well within the manageable tier.
Remediation costs in Isabel are relatively low compared to home values. The $0–$800 estimated range is a small fraction of median property value. Home values are 64% below the South Dakota average.
Lead Exposure Risk for Children in Isabel
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.
Older interior plumbing shapes the local picture: 83% of Isabel homes predate the federal solder ban, and aggregate sampling either approaches or crosses the action benchmark. That mix makes a single-home draw a standard pre-purchase or pre-occupancy step.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Deep Dive Reports
Detailed analysis for Isabel, SD