COUNTY REPORT WA

Walla Walla County, Washington

Name: Home Safety Data for Walla Walla County, Washington
Creator: ZipCheckup
License: https://creativecommons.org/licenses/by/4.0/

9 ZIP codes · Avg score 66/100 · Grade C

ZipCheckup grade for Walla Walla County: C.

A mixed picture - some signals here are worth your attention.

Walla Walla County earns a C, tracked across 9 ZIP codes.

How Walla Walla County Compares

Walla Walla County66/100

Washington avg86/100

National avg73/100

How Walla Walla County Compares

County Grade

66/100

Avg Safety Score

ZIP Codes

Water Systems

Walla Walla County scores 20 points below the Washington state average (86/100) and 7 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

County Grade

Avg Safety Score

ZIP Codes

College Place

Best ZIP: 99324 (67/100)

Kennewick

Lowest ZIP: 99337 (64/100)

$339K

Median Home Value

$900

Avg Remediation (0.27% of home value)

ZIP Code Risk Map

Water Quality Map: Walla Walla County, Washington

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Key Risk Factors

Health risk index: 12.1 (asthma 11%, diabetes 10.6%)

Modeled additional annual cost estimate per homeowner: $1,186, largest modeled factor: Flood

56% of homes built before 1980 (lead paint was banned for residential use in 1978)

County Health Indicators vs National Average

Asthma 11% (national: 8.9%)

Diabetes 10.6% (national: 10.5%)

Obesity 34.1% (national: 32.4%)

Black markers indicate national averages. Source: CDC PLACES, Census ACS.

Infrastructure Overview

1977

Median Build Year

56%

Pre-1980 Housing

43/100

Infrastructure Stress Indicator

56%

ZIPs with High Infrastructure Stress

Low

Lead Pipe Risk

Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINSA infrastructure needs, EPA SDWIS violations, and EPA lead indicators.

Compound Risk Breakdown

Estimated additional annual cost per homeowner: $1,186

Flood $543/yr

Energy Code Gap $430/yr

Wildfire $300/yr

Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).

Housing Age Distribution

36,635 housing units in Walla Walla County

Pre-1940 15%

1940–1959 15%

1960–1979 26%

1980–1999 22%

2000+ 23%

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 Walla Walla County

$339K

Median Home Value

$900

Est. Remediation Cost

0.3%

of Home Value

Remediation as % of home value low burden

Modeled remediation costs in Walla Walla County can be compared with the median property value; actual costs vary by property.

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 Walla Walla County residents

Asthma 11% (US avg: 8.9%)

Diabetes 10.6% (US avg: 11%)

Obesity 34.1% (US avg: 32.4%)

Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.

Water systems mapped to Walla Walla County ZIP codes

8 community water systems mapped to Walla Walla County ZIP codes; EPA may list more systems serving the county.

City of Kennewick
Serves ~118,164 people 2 violations

C
Walla Walla Water Division
Serves ~42,959 people 18 violations

C
College Place Water Department
Serves ~8,147 people 100 violations

C
Consolidated Irrigation District 14
Serves ~1,555 people

C
Walla Walla University
Serves ~1,273 people 3 violations

C
Veterans Affair Med Ctr Department of
Serves ~785 people 1 violation

C

Show all 8 water systems

Green Tank Irr District 11
Serves ~553 people

C
Artesian Water District 8
Serves ~302 people 3 violations

C

11 water systems mapped to Walla Walla County ZIP codes in our data; EPA may list more systems serving the county.

Systems with the most violations in Walla Walla County

5 water systems with violations in EPA records.

College Place Water Department
Serves ~8,147 people 100 violations

C
Walla Walla Water Division
Serves ~42,959 people 18 violations

C
Good Neighbors Water Assn
Serves ~40 people 4 violations

C
Walla Walla University
Serves ~1,273 people 3 violations

C
Artesian Water District 8
Serves ~302 people 3 violations

C

All ZIP Codes in Walla Walla County

9 ZIP codes tracked in Walla Walla County.

#	ZIP Code	City	Safety Score	Grade	Violations	Home Value
1	99324	College Place	67	C	106	$339K
2	99362	Walla Walla	67	C	119	$398K
3	99337	Kennewick	64	C	8 (1 health)	$357K
4	99323	Burbank	—	—		$359K
5	99329	Dixie	—	—		$278K
6	99348	Prescott	—	—		$204K
7	99360	Touchet	—	—		$492K
8	99361	Waitsburg	—	—		$291K
9	99363	Wallula	—	—		$207K

Recommended Buyer Guides for Walla Walla County

The mix of guides changes from county to county.

Water Filters Certified for PFAS Reduction — PFAS detected in 2 ZIP codes
Best Lead Paint Test Kits — 56% of homes built before 1980
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 Walla Walla County, Washington

💧

Water Quality

EPA violations, contaminant trends, and enforcement actions across the county

🏠

Home Affordability

Remediation costs vs. home values, equity trap analysis by ZIP

$900 avg remediation

🌊

Flood Risk

NFIP claim history and recorded rated-zone context across the county, plus FEMA property-map guidance

Overview

Walla Walla County in Washington covers 9 tracked ZIP records with an average Home Safety Score of C (66/100) across 3 scored records.

3 of 3 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 1 health-based violation 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.

Frequently Asked Questions

Is water safe in Walla Walla County?

Walla Walla County receives a grade of C. Some ZIP codes have recorded violations and residents in affected areas may want to test their water.

How many water systems serve Walla Walla County?

We map 11 public water systems to 9 ZIP codes in our data for Walla Walla County. EPA may list more systems serving the county, so this is not a full count.

What is the biggest environmental risk in Walla Walla County?

In ZipCheckup's cost model, the factor with the largest estimated average annual cost in Walla Walla County is flood. Across all modeled risk factors, the estimated average additional annual cost is $1,186 per homeowner; actual costs vary by home.

How old are homes in Walla Walla County?

The median home build year in Walla Walla County is 1977. 56% of homes were built before 1980; homes built before 1978 may contain lead-based paint, and older homes may have older plumbing materials.

How does Walla Walla County compare to Washington?

Walla Walla County has an average Home Safety Score of 66/100 under model 4.0.0, which is below the Washington state average of 86/100.

Explore More

Flood Risk Rankings 2026 Lead Risk Rankings 2026 Water Safety Rankings 2026 Home Safety Rankings 2026 Water Filter Matcher Find the right filter for your water Home Safety Score Full safety breakdown by ZIP

Washington State Overview →