Owyhee County, Idaho
5 ZIP codes · Avg score 77/100 · Grade B · Updated 2026-06-03
Covering 5 ZIP codes, Owyhee County earns a high grade for tap water — most systems report zero health-based violations, and the overall compliance rate comfortably exceeds federal benchmarks.
How Owyhee County Compares
How Owyhee County Compares
Owyhee County scores 11 points above the Idaho state average (66/100) and 9 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Owyhee County, Idaho
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.9 (asthma 11%, diabetes 13.4%)
Estimated additional annual cost per homeowner: $852, driven primarily by energy_code_gap
Infrastructure: 0.362% avg pipe failure probability
53.8% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Owyhee County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 2 violations. Past 5 years: 5 total (5 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
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $852
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
4,271 housing units in Owyhee 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 Owyhee County
Remediation costs are relatively manageable for most homeowners in Owyhee 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 Owyhee 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 Owyhee County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Marsing | 1,300 | 28 |
| 2 | East Lizard Butte Water Corporation | 95 | 21 |
| 3 | Hope House (owyhee) | 78 | 21 |
| 4 | City of Grand View, | 352 | 13 |
| 5 | Simplot Livestock Company Grandview | 100 | 13 |
9 total water systems serve Owyhee County.
All ZIP Codes in Owyhee County
5 ZIP codes tracked in Owyhee County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 83650 | Murphy | 83 | B | 0 | $308K |
| 2 | 83604 | Bruneau | 82 | B | 2 (1 health) | $250K |
| 3 | 83624 | Grand View | 79 | B | 13 (1 health) | $269K |
| 4 | 83639 | Marsing | 79 | B | 21 (3 health) | $397K |
| 5 | 83628 | Homedale | 64 | C | 7 | $233K |
Recommended Buyer Guides for Owyhee County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 53.8% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Owyhee County, Idaho
Overview
Owyhee County in Idaho covers 5 ZIP codes with an average Home Safety Score of B (77/100).
4 of 5 ZIP codes have recorded EPA violations. 5 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.