Malheur County, Oregon
9 ZIP codes · Avg score 65/100 · Grade C · Updated 2026-06-03
Covering 9 ZIP codes, Malheur County falls in the average tier for tap water safety — violations appear in a meaningful share of areas, and the data suggests quality depends heavily on which specific part of the county a household sits in.
How Malheur County Compares
How Malheur County Compares
Malheur County scores 13 points below the Oregon state average (78/100) and 3 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Malheur County, Oregon
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.6 (asthma 11.8%, diabetes 14%)
Estimated additional annual cost per homeowner: $1,273, driven primarily by energy_code_gap
Infrastructure: 0.407% avg pipe failure probability, 44% of ZIPs at high risk
70.8% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Malheur County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 7 violations. Past 5 years: 11 total (11 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: $1,273
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
11,535 housing units in Malheur 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 Malheur County
Remediation costs are relatively manageable for most homeowners in Malheur 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 Malheur 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 Malheur County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Adrian, | 159 | 28 |
| 2 | City of Nyssa, | 3,285 | 12 |
| 3 | City of Ontario, | 14,465 | 12 |
| 4 | JORDAN VALLEY, CITY OF | 175 | 6 |
| 5 | VALE, CITY OF | 1,837 | 6 |
6 total water systems serve Malheur County.
All ZIP Codes in Malheur County
9 ZIP codes tracked in Malheur County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 97910 | Jordan Valley | 80 | B | 6 | $190K |
| 2 | 97913 | Nyssa | 79 | B | 6 | $197K |
| 3 | 97914 | Ontario | 72 | B | 6 | $221K |
| 4 | 97918 | Vale | 68 | C | 6 | $241K |
| 5 | 97906 | Harper | 63 | C | 0 | $288K |
| 6 | 97920 | Westfall | 63 | C | 0 | — |
| 7 | 97710 | Fields | 53 | D | 0 | $241K |
| 8 | 97902 | Arock | 53 | D | 0 | — |
| 9 | 97901 | Adrian | 50 | D | 28 (11 health) | $443K |
Recommended Buyer Guides for Malheur County
Editorial-only picks, screened against the EPA detections on file.
- Best Lead Paint Test Kits — 70.8% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Malheur County, Oregon
Overview
Malheur County in Oregon covers 9 ZIP codes with an average Home Safety Score of C (65/100).
5 of 9 ZIP codes have recorded EPA violations. 11 health-based violations have been documented.
← Back to Oregon 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.