Benton County, Oregon
6 ZIP codes · Avg score 90/100 · Grade A · Updated 2026-06-03
Recent water monitoring in Benton County shows 6 ZIP codes with consistently safe results.
How Benton County Compares
How Benton County Compares
Benton County scores 12 points above the Oregon state average (78/100) and 22 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Benton County, Oregon
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.6 (asthma 11.6%, diabetes 9.3%)
Estimated additional annual cost per homeowner: $1,123, driven primarily by sea_level
Infrastructure: 0.36% avg pipe failure probability, 33% of ZIPs at high risk
65% 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: $1,123
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
24,941 housing units in Benton 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 Benton County
Remediation costs are relatively manageable for most homeowners in Benton 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 Benton 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 Benton County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Corvallis, | 61,468 | 20 |
| 2 | Vineyard Mountain Water | 325 | 18 |
| 3 | Knoll Terrace Park | 452 | 18 |
| 4 | Alsea County Service District | 202 | 18 |
| 5 | Cascade View Estates | 113 | 18 |
9 total water systems serve Benton County.
All ZIP Codes in Benton County
6 ZIP codes tracked in Benton County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 97331 | Corvallis | 98 | A | 6 (1 health) | — |
| 2 | 97339 | Corvallis | 98 | A | 6 (1 health) | — |
| 3 | 97324 | Alsea | 90 | A | 4 | $325K |
| 4 | 97330 | Corvallis | 89 | A | 6 (1 health) | $496K |
| 5 | 97370 | Philomath | 89 | A | 2 | $425K |
| 6 | 97326 | Blodgett | 73 | B | 0 | $334K |
Recommended Buyer Guides for Benton 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 — 65% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Benton County, Oregon
Overview
Benton County in Oregon covers 6 ZIP codes with an average Home Safety Score of A (90/100).
5 of 6 ZIP codes have recorded EPA violations. 3 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.