Blaine County, Idaho
7 ZIP codes · Avg score 60/100 · Grade C · Updated 2026-06-03
Water monitoring across Blaine County's 7 ZIP codes paints a mid-range picture — solid compliance in some zones, documented concerns in others; most violations on record are concentrated in specific prior years rather than spread evenly across the full compliance history, and the overall county grade has held steady in the middle tier without major shifts in either direction.
How Blaine County Compares
How Blaine County Compares
Blaine County scores 6 points below the Idaho state average (66/100) and 8 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Blaine County, Idaho
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11 (asthma 9.9%, diabetes 10.2%)
Estimated additional annual cost per homeowner: $1,836, driven primarily by flood
Infrastructure: 0.376% avg pipe failure probability, 14% of ZIPs at high risk
62.7% of homes built before 1978 (lead paint era)
Violation History (2023–2025)
→ Stable trendEPA violation counts by year across Blaine County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 3 violations. Past 5 years: 5 total (5 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: $1,836
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
15,415 housing units in Blaine 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 Blaine County
Remediation costs are relatively manageable for most homeowners in Blaine 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 Blaine 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 Blaine County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Sun Valley Water and Sewer District | 3,400 | 28 |
| 2 | Aspen Hollow Homeowners Assoc | 75 | 22 |
| 3 | City of Ketchum | 3,555 | 14 |
| 4 | Cold Springs Subd | 300 | 14 |
| 5 | City of Bellevue | 2,747 | 6 |
14 total water systems serve Blaine County.
All ZIP Codes in Blaine County
7 ZIP codes tracked in Blaine County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 83354 | Sun Valley | 65 | C | 11 (1 health) | — |
| 2 | 83320 | Carey | 64 | C | 1 | $242K |
| 3 | 83353 | Sun Valley | 64 | C | 11 (1 health) | $829K |
| 4 | 83313 | Bellevue | 62 | C | 6 (2 health) | $513K |
| 5 | 83348 | Picabo | 62 | C | 3 | $282K |
| 6 | 83333 | Hailey | 56 | C | 3 | $688K |
| 7 | 83340 | Ketchum | 44 | D | 3 | $860K |
Recommended Buyer Guides for Blaine County
Editorial methodology pairs each documented risk in this county with the buyer category that addresses it, drawing on water-quality detections, housing-stock lead exposure, EPA Radon Zone designation, and FEMA flood and wildfire ratings. NSF-certified options surface where applicable, and products that match the specific contaminant take priority.
- Best Lead Paint Test Kits — 62.7% 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 Blaine County, Idaho
Overview
Blaine County in Idaho covers 7 ZIP codes with an average Home Safety Score of C (60/100).
7 of 7 ZIP codes have recorded EPA violations. 4 health-based violations have been documented.
← Back to Idaho 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.