countyscore

Best Soil Quality Counties in Washington

Soil composition, pH, drainage, and organic matter content Compare rankings across all 39 counties.

Average Soil Quality Score
18/100
Top County
Whitman County
Counties Ranked
39

Top 10

#1
Whitman County
WA
79/100
#2
Island County
WA
76/100
#3
Stevens County
WA
75/100
#4
San Juan County
WA
72/100
#5
Lincoln County
WA
70/100
#6
Spokane County
WA
68/100
#7
Clark County
WA
54/100
#8
Cowlitz County
WA
53/100
#9
Douglas County
WA
52/100
#10
Adams County
WA
34/100

All Washington Counties Ranked

#CountySoil Quality ScoreOverall Score
1Whitman County, WA
79
49.8
2Island County, WA
76.1
50.7
3Stevens County, WA
74.5
55.1
4San Juan County, WA
72.1
55.5
5Lincoln County, WA
69.5
60.9
6Spokane County, WA
67.7
36.8
7Clark County, WA
54
38.2
8Cowlitz County, WA
52.5
36
9Douglas County, WA
52
45.1
10Adams County, WA
34.3
37.4
11Franklin County, WA
33.1
34.4
12Grant County, WA
32.5
32.8
13Asotin County, WA
45
14Benton County, WA
36.8
15Chelan County, WA
42
16Clallam County, WA
40.4
17Columbia County, WA
44.8
18Ferry County, WA
58
19Garfield County, WA
54.4
20Grays Harbor County, WA
36.2
21Jefferson County, WA
48.6
22King County, WA
39.5
23Kitsap County, WA
40.1
24Kittitas County, WA
41.8
25Klickitat County, WA
52.7
26Lewis County, WA
37.2
27Mason County, WA
40.1
28Okanogan County, WA
45.9
29Pacific County, WA
45.7
30Pend Oreille County, WA
54.7
31Pierce County, WA
33.7
32Skagit County, WA
37.3
33Skamania County, WA
57.8
34Snohomish County, WA
41.7
35Thurston County, WA
37.7
36Wahkiakum County, WA
69.1
37Walla Walla County, WA
37
38Whatcom County, WA
38
39Yakima County, WA
30.4

Data Source

Soil Quality data from SoilByCounty. See full details at SoilByCounty. Data updated February 2026.