Grant County, Washington
16 ZIP codes · Avg score 71/100 · Grade B · Updated
ZipCheckup grade for Grant County: B.
This ZIP looks solid, with a few items worth a quick check.
Although county size varies, Grant County's 16 ZIP codes share reliably safe tap water records and above-average compliance scores.
How Grant County Compares
How Grant County Compares
Grant County scores 15 points below the Washington state average (86/100) and 2 points below the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
ZIP Code Risk Map
Water Quality Map: Grant County, Washington
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.6 (asthma 10.8%, diabetes 11.5%)
Estimated additional annual cost per homeowner: $1,043, driven primarily by energy_code_gap
60.1% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across Grant County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 1 violation. Past 5 years: 2 total (2 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
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,043
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
38,490 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 serving Grant County
8 community water systems serving Grant County.
- D
- C
- C
- C
- B
Show all 8 water systems
- B
15 total water systems serve Grant County.
Systems with the most violations in Grant County
5 water systems with recorded EPA violations.
- C
- D
- C
- D
All ZIP Codes in Grant County
16 ZIP codes tracked in Grant County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 98857 | Warden | 83 | B | 0 | $194K |
| 2 | 99349 | Mattawa | 82 | B | 2 (1 health) | $409K |
| 3 | 98848 | Quincy | 67 | C | 132 (2 health) | $309K |
| 4 | 98837 | Moses Lake | 50 | D | 57 | $290K |
| 5 | 98823 | Ephrata | — | — | 48 | $256K |
| 6 | 98824 | George | — | — | $180K | |
| 7 | 98832 | Marlin | — | — | $259K | |
| 8 | 98851 | Soap Lake | — | — | 1 | $241K |
| 9 | 98853 | Stratford | — | — | — | |
| 10 | 98860 | Wilson Creek | — | — | $184K | |
| 11 | 99115 | Coulee City | — | — | $208K | |
| 12 | 99123 | Electric City | — | — | $248K | |
| 13 | 99133 | Grand Coulee | — | — | $221K | |
| 14 | 99135 | Hartline | — | — | $198K | |
| 15 | 99321 | Beverly | — | — | — | |
| 16 | 99357 | Royal City | — | — | $307K |
Recommended Buyer Guides for Grant County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations - federal data drives the order, not retailer arrangements.
- Best Water Filters for PFAS — PFAS detected in 3 ZIP codes
- Best Lead Paint Test Kits — 60.1% 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, Washington
Overview
Grant County in Washington covers 16 tracked ZIP records with an average Home Safety Score of B (71/100) across 4 scored records.
5 of 6 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 3 health-based violations appear in the available health breakdown.
← Back to Washington Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.