countyscore

Best Soil Quality Counties in California

Soil composition, pH, drainage, and organic matter content Compare rankings across all 58 counties.

Average Soil Quality Score
13/100
Top County
Contra Costa County
Counties Ranked
58

Top 10

#1
Contra Costa County
CA
65/100
#2
Santa Cruz County
CA
65/100
#3
San Joaquin County
CA
63/100
#4
Napa County
CA
57/100
#5
San Benito County
CA
57/100
#6
Lake County
CA
53/100
#7
Monterey County
CA
53/100
#8
Sonoma County
CA
52/100
#9
Solano County
CA
51/100
#10
Yolo County
CA
49/100

All California Counties Ranked

#CountySoil Quality ScoreOverall Score
1Contra Costa County, CA
65.1
40.1
2Santa Cruz County, CA
65
41.6
3San Joaquin County, CA
62.6
33.1
4Napa County, CA
56.9
43.6
5San Benito County, CA
56.6
43.3
6Lake County, CA
52.9
31.6
7Monterey County, CA
52.5
39
8Sonoma County, CA
52.4
44.8
9Solano County, CA
51.3
36.4
10Yolo County, CA
49.3
38
11Marin County, CA
46.1
47.4
12Colusa County, CA
45.2
41.8
13Glenn County, CA
39.7
41.8
14Sutter County, CA
37.4
35
15Sacramento County, CA
26.6
38.3
16Kings County, CA
17.7
38.2
17Alameda County, CA
40.6
18Alpine County, CA
51.2
19Amador County, CA
41.8
20Butte County, CA
39.3
21Calaveras County, CA
43
22Del Norte County, CA
39.9
23El Dorado County, CA
49.8
24Fresno County, CA
33
25Humboldt County, CA
40
26Imperial County, CA
33.7
27Inyo County, CA
41.1
28Kern County, CA
27.8
29Lassen County, CA
40.4
30Los Angeles County, CA
36.9
31Madera County, CA
35.5
32Mariposa County, CA
43.9
33Mendocino County, CA
44.1
34Merced County, CA
35.3
35Modoc County, CA
49.7
36Mono County, CA
38.5
37Nevada County, CA
45.2
38Orange County, CA
44.3
39Placer County, CA
46.5
40Plumas County, CA
41
41Riverside County, CA
37.2
42San Bernardino County, CA
33.7
43San Diego County, CA
42.3
44San Francisco County, CA
43.6
45San Luis Obispo County, CA
42.9
46San Mateo County, CA
47.6
47Santa Barbara County, CA
43
48Santa Clara County, CA
42.2
49Shasta County, CA
52.3
50Sierra County, CA
52.4
51Siskiyou County, CA
37.9
52Stanislaus County, CA
35.6
53Tehama County, CA
36.7
54Trinity County, CA
48.3
55Tulare County, CA
35.2
56Tuolumne County, CA
41.7
57Ventura County, CA
44.3
58Yuba County, CA
37.7

Data Source

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