Whitman County, Washington
24 ZIP codes · Avg score 69/100 · Grade C · Updated 2026-06-03
Covering 24 ZIP codes, Whitman County falls in the average tier for tap water safety — violations appear in a meaningful share of areas, and the data suggests quality depends heavily on which specific part of the county a household sits in.
How Whitman County Compares
How Whitman County Compares
Whitman County scores 9 points below the Washington state average (78/100) and 1 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Whitman County, Washington
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.1 (asthma 11.9%, diabetes 7.6%)
Estimated additional annual cost per homeowner: $1,258, driven primarily by energy_code_gap
Infrastructure: 0.431% avg pipe failure probability, 78% of ZIPs at high risk
80.2% 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: $1,258
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
21,091 housing units in Whitman 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 Whitman County
Remediation costs are relatively manageable for most homeowners in Whitman 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 Whitman 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 Whitman County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Pullman Water Department | 29,690 | 17 |
| 2 | Washington State University | 21,506 | 12 |
| 3 | City of Tekoa | 1,076 | 6 |
| 4 | Fairfield Town of | 643 | 6 |
| 5 | Williams Lake Beach Club | 45 | 6 |
19 total water systems serve Whitman County.
All ZIP Codes in Whitman County
24 ZIP codes tracked in Whitman County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 99113 | Colton | 83 | B | 0 | $356K |
| 2 | 99125 | Endicott | 83 | B | 0 | $172K |
| 3 | 99128 | Farmington | 82 | B | 2 | $300K |
| 4 | 99170 | Rosalia | 82 | B | 3 | $216K |
| 5 | 99017 | Lamont | 81 | B | 5 | $106K |
| 6 | 99102 | Albion | 81 | B | 1 | $171K |
| 7 | 99161 | Palouse | 81 | B | 1 | $286K |
| 8 | 99179 | Uniontown | 81 | B | 1 | $324K |
| 9 | 99033 | Tekoa | 79 | B | 6 | $272K |
| 10 | 99111 | Colfax | 78 | B | 5 | $264K |
| 11 | 99164 | Pullman | 78 | B | 4 | — |
| 12 | 99165 | Pullman | 78 | B | 4 | — |
| 13 | 99163 | Pullman | 73 | B | 4 | $413K |
| 14 | 99143 | Lacrosse | 72 | B | 3 | $120K |
| 15 | 99130 | Garfield | 63 | C | 0 | $211K |
| 16 | 99158 | Oakesdale | 63 | C | 0 | $242K |
| 17 | 99104 | Belmont | 53 | D | 0 | — |
| 18 | 99105 | Benge | 53 | D | 0 | — |
| 19 | 99136 | Hay | 53 | D | 0 | $119K |
| 20 | 99149 | Malden | 53 | D | 0 | $74K |
| 21 | 99171 | Saint John | 53 | D | 0 | $210K |
| 22 | 99174 | Steptoe | 53 | D | 0 | $225K |
| 23 | 99176 | Thornton | 53 | D | 0 | $258K |
| 24 | 99333 | Hooper | 53 | D | 0 | $557K |
Recommended Buyer Guides for Whitman 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 Lead Paint Test Kits — 80.2% of homes built before 1978
Deep Dive Reports
Detailed analysis for Whitman County, Washington
Overview
Whitman County in Washington covers 24 ZIP codes with an average Home Safety Score of C (69/100).
12 of 24 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.