Spokane County, Washington
51 ZIP codes · Avg score 64/100 · Grade C · Updated 2026-06-03
Spanning 51 ZIP codes, Spokane County lands near the national median for water safety — compliance results are mixed, and the county's middle-grade standing reflects genuine variability rather than a single systemic problem.
How Spokane County Compares
How Spokane County Compares
Spokane County scores 14 points below the Washington state average (78/100) and 4 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Spokane County, Washington
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.1 (asthma 11.5%, diabetes 10.3%)
Estimated additional annual cost per homeowner: $790, driven primarily by wildfire
Infrastructure: 0.301% avg pipe failure probability, 14% of ZIPs at high risk
54.1% 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: $790
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
226,238 housing units in Spokane 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 Spokane County
Remediation costs are relatively manageable for most homeowners in Spokane 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 Spokane 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 Spokane County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Wilbur Town of | 1,040 | 15 |
| 2 | Hangman Hills Water District 15 | 827 | 15 |
| 3 | Pioneer Water Company | 443 | 15 |
| 4 | Seven Bays Estates Unlimited | 431 | 15 |
| 5 | Vel View Water District 13 | 77 | 15 |
39 total water systems serve Spokane County.
All ZIP Codes in Spokane County
51 ZIP codes tracked in Spokane County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 99005 | Colbert | 70 | B | 0 | $488K |
| 2 | 99019 | Liberty Lake | 70 | B | 0 | $558K |
| 3 | 99022 | Medical Lake | 70 | B | 1 | $346K |
| 4 | 99025 | Newman Lake | 70 | B | 0 | $458K |
| 5 | 99030 | Rockford | 70 | B | 1 | $284K |
| 6 | 99201 | Spokane | 70 | B | 0 | $260K |
| 7 | 99202 | Spokane | 70 | B | 0 | $269K |
| 8 | 99203 | Spokane | 70 | B | 0 | $449K |
| 9 | 99204 | Spokane | 70 | B | 0 | $356K |
| 10 | 99206 | Spokane | 70 | B | 0 | $362K |
| 11 | 99207 | Spokane | 70 | B | 0 | $247K |
| 12 | 99208 | Spokane | 70 | B | 0 | $414K |
| 13 | 99210 | Spokane | 70 | B | 0 | — |
| 14 | 99212 | Spokane | 70 | B | 0 | $314K |
| 15 | 99217 | Spokane | 70 | B | 0 | $329K |
| 16 | 99218 | Spokane | 70 | B | 0 | $405K |
| 17 | 99223 | Spokane | 70 | B | 0 | $457K |
| 18 | 99224 | Spokane | 70 | B | 0 | $440K |
| 19 | 99003 | Chattaroy | 69 | C | 7 (1 health) | $411K |
| 20 | 99031 | Spangle | 67 | C | 4 | $330K |
| 21 | 99006 | Deer Park | 66 | C | 1 | $367K |
| 22 | 99014 | Four Lakes | 66 | C | 1 | — |
| 23 | 99016 | Greenacres | 66 | C | 5 | $450K |
| 24 | 99205 | Spokane | 66 | C | 0 | $286K |
| 25 | 99209 | Spokane | 66 | C | 0 | — |
| 26 | 99211 | Spokane | 66 | C | 0 | — |
| 27 | 99213 | Spokane | 66 | C | 0 | — |
| 28 | 99214 | Spokane | 66 | C | 0 | — |
| 29 | 99215 | Spokane | 66 | C | 0 | — |
| 30 | 99216 | Spokane | 66 | C | 0 | $337K |
| 31 | 99219 | Spokane | 66 | C | 0 | — |
| 32 | 99220 | Spokane | 66 | C | 0 | — |
| 33 | 99228 | Spokane | 66 | C | 0 | — |
| 34 | 99251 | Spokane | 66 | C | 0 | — |
| 35 | 99252 | Spokane | 66 | C | 0 | — |
| 36 | 99256 | Spokane | 66 | C | 0 | — |
| 37 | 99258 | Spokane | 66 | C | 0 | — |
| 38 | 99260 | Spokane | 66 | C | 0 | — |
| 39 | 99299 | Spokane | 66 | C | 0 | — |
| 40 | 99039 | Waverly | 64 | C | 4 | $192K |
| 41 | 99021 | Mead | 62 | C | 5 | $418K |
| 42 | 99004 | Cheney | 61 | C | 4 | $369K |
| 43 | 99020 | Marshall | 54 | D | 15 | — |
| 44 | 99026 | Nine Mile Falls | 53 | D | 0 | $477K |
| 45 | 99027 | Otis Orchards | 53 | D | 0 | $368K |
| 46 | 99036 | Valleyford | 53 | D | 0 | $581K |
| 47 | 99037 | Veradale | 53 | D | 0 | $447K |
| 48 | 99001 | Airway Heights | 40 | D | 0 | $281K |
| 49 | 99011 | Fairchild Air Force Base | 40 | D | 0 | — |
| 50 | 99023 | Mica | 40 | D | 0 | $700K |
| 51 | 99110 | Clayton | 40 | D | 0 | $445K |
Recommended Buyer Guides for Spokane County
Designed to find the guide that fits the county, not the other way around — the system reads EPA detections, FEMA hazard layers, and CDC lead-exposure markers, then outputs the categories that resolve those specific risks for households here, with NSF-certified products surfaced when the matching contaminant appears in the local monitoring data.
- Best Lead Paint Test Kits — 54.1% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best HEPA Air Purifiers for Wildfire Smoke — Wildfire is the top compound risk factor
Deep Dive Reports
Detailed analysis for Spokane County, Washington
Overview
Spokane County in Washington covers 51 ZIP codes with an average Home Safety Score of C (64/100).
11 of 51 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← Back to Washington 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.