Yamhill County, Oregon
11 ZIP codes · Avg score 72/100 · Grade B · Updated 2026-06-03
Spanning 11 ZIP codes, Yamhill County posts strong drinking water compliance — most systems have never triggered a health-based notice.
How Yamhill County Compares
How Yamhill County Compares
Yamhill County scores 6 points below the Oregon state average (78/100) and 4 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Yamhill County, Oregon
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.8 (asthma 11.9%, diabetes 11.4%)
Estimated additional annual cost per homeowner: $817, driven primarily by flood
Infrastructure: 0.343% avg pipe failure probability, 10% of ZIPs at high risk
48.5% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Yamhill County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 8 violations. Past 5 years: 16 total (16 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: $817
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
39,418 housing units in Yamhill 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 Yamhill County
Remediation costs are relatively manageable for most homeowners in Yamhill 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 Yamhill 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 Yamhill County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Perrydale Domestic Wtr Assn | 2,655 | 66 |
| 2 | City of Dallas, | 17,911 | 66 |
| 3 | City of Lafayette, | 4,423 | 62 |
| 4 | Buell-red Prairie Water District | 800 | 51 |
| 5 | Luckiamute Domestic Water Coop | 2,738 | 51 |
28 total water systems serve Yamhill County.
All ZIP Codes in Yamhill County
11 ZIP codes tracked in Yamhill County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 97111 | Carlton | 82 | B | 7 (1 health) | $473K |
| 2 | 97114 | Dayton | 80 | B | 1 | $455K |
| 3 | 97115 | Dundee | 79 | B | 3 | $498K |
| 4 | 97128 | Mcminnville | 75 | B | 6 | $419K |
| 5 | 97101 | Amity | 73 | B | 15 | $484K |
| 6 | 97127 | Lafayette | 72 | B | 33 (3 health) | $383K |
| 7 | 97148 | Yamhill | 72 | B | 16 | $532K |
| 8 | 97378 | Sheridan | 72 | B | 51 (1 health) | $341K |
| 9 | 97132 | Newberg | 69 | C | 18 | $499K |
| 10 | 97137 | Saint Paul | 63 | C | 0 | $585K |
| 11 | 97313 | State Farm Ins | 53 | D | 0 | — |
Recommended Buyer Guides for Yamhill County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Yamhill County, Oregon
Overview
Yamhill County in Oregon covers 11 ZIP codes with an average Home Safety Score of B (72/100).
9 of 11 ZIP codes have recorded EPA violations. 5 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.