Washington County, Idaho
3 ZIP codes · Avg score 80/100 · Grade B · Updated 2026-06-03
Based on current EPA data, Washington County's 3 ZIP codes maintain an above-average drinking water safety record.
How Washington County Compares
How Washington County Compares
Washington County scores 14 points above the Idaho state average (66/100) and 12 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
Key Risk Factors
Health risk index: 14.7 (asthma 11.1%, diabetes 14.5%)
Estimated additional annual cost per homeowner: $1,257, driven primarily by energy_code_gap
Infrastructure: 0.373% avg pipe failure probability
61.3% of homes built before 1978 (lead paint era)
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: $1,257
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
4,551 housing units in Washington 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 Washington County
Remediation costs are relatively manageable for most homeowners in Washington 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 Washington County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
All ZIP Codes in Washington County
3 ZIP codes tracked in Washington County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 83610 | Cambridge | 88 | A | 7 | $262K |
| 2 | 83672 | Weiser | 80 | B | 1 | $244K |
| 3 | 83645 | Midvale | 73 | B | 0 | $297K |
Recommended Buyer Guides for Washington County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 61.3% of homes built before 1978
Overview
Washington County in Idaho covers 3 ZIP codes with an average Home Safety Score of B (80/100).
2 of 3 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.