Grant County, Oregon
12 ZIP codes · Avg score 72/100 · Grade B · Updated 2026-06-03
Recent water monitoring in Grant County shows 12 ZIP codes with consistently safe results.
How Grant County Compares
How Grant County Compares
Grant 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: Grant County, Oregon
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.3 (asthma 12.1%, diabetes 14.5%)
Estimated additional annual cost per homeowner: $1,197, driven primarily by energy_code_gap
Infrastructure: 0.383% avg pipe failure probability, 33% of ZIPs at high risk
69.6% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Grant County water systems. Health-based shown in red, total in blue.
Peak year: 2021 with 2 violations. Past 5 years: 5 total (5 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: $1,197
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
4,128 housing units in Grant 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 Grant County
Remediation costs are relatively manageable for most homeowners in Grant 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 Grant 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 Grant County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | MONUMENT, CITY OF | 115 | 24 |
| 2 | Canyon City Water Department | 666 | 9 |
| 3 | City of Seneca, | 200 | 5 |
| 4 | PRAIRIE CITY | 841 | 4 |
| 5 | City of John Day, | 1,617 | 3 |
8 total water systems serve Grant County.
All ZIP Codes in Grant County
12 ZIP codes tracked in Grant County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 97825 | Dayville | 83 | B | 0 | $235K |
| 2 | 97856 | Long Creek | 83 | B | 0 | $254K |
| 3 | 97865 | Mount Vernon | 83 | B | 1 | $191K |
| 4 | 97845 | John Day | 82 | B | 3 | $272K |
| 5 | 97873 | Seneca | 81 | B | 5 | $157K |
| 6 | 97869 | Prairie City | 80 | B | 4 | $191K |
| 7 | 97820 | Canyon City | 78 | B | 9 (1 health) | $218K |
| 8 | 97864 | Monument | 77 | B | 24 (2 health) | $508K |
| 9 | 97848 | Kimberly | 63 | C | 0 | $400K |
| 10 | 97751 | Paulina | 53 | D | 0 | — |
| 11 | 97817 | Bates | 53 | D | 0 | — |
| 12 | 97904 | Drewsey | 53 | D | 0 | $596K |
Recommended Buyer Guides for Grant County
Below: editorial picks, no sponsored placements.
- Best Water Filters for PFAS — PFAS detected in 1 ZIP code
- Best Lead Paint Test Kits — 69.6% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Grant County, Oregon
Overview
Grant County in Oregon covers 12 ZIP codes with an average Home Safety Score of B (72/100).
6 of 12 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.