Showing California county sites. All U.S. county sites
B 85
Average security score of 40 fully scanned California county sites
9th
of 49 states, ranked by average security score
40 of 57
Sites fully scanned. We couldn't fully scan 17, so they're listed without grades
B 83
U.S. county average security score, 2467 fully scanned sites
California's state site, ca.gov, ranks 1st of 51 state sites with an A. State rankings.
How California county security scores are distributed
Smoothed distribution of the 40 fully scanned California county sites, score 0 to 100. Height shows how many sites score near each value.
Distribution of 40 scores. The data table lists counts by score range.
- California average
- U.S. county average
View the data table
| Score range | Sites |
|---|---|
| 0 to 9 | 0 |
| 10 to 19 | 0 |
| 20 to 29 | 0 |
| 30 to 39 | 0 |
| 40 to 49 | 0 |
| 50 to 59 | 0 |
| 60 to 69 | 3 |
| 70 to 79 | 15 |
| 80 to 89 | 9 |
| 90 to 100 | 13 |
California counties by security grade
Each county with a site on our list is colored by that site's grade. Select a county to open its report. The table lists every site.
- A (90 to 100)
- B to C (70 to 89)
- D to F (below 70)
- Not fully scanned
- No site on our list
3 of the 57 sites on our list could not be matched to a county boundary and appear only in the table.
California counties by security grade, compared with all U.S. counties
Share of fully scanned sites in each grade band. California: 40 sites. U.S.: 2467 sites.
- A (90 to 100)
- B to C (70 to 89)
- D to F (below 70)
View the data table
| Group | A (90 to 100) | B to C (70 to 89) | D to F (below 70) |
|---|---|---|---|
| California | 33% (13) | 60% (24) | 8% (3) |
| All U.S. counties | 21% (530) | 67% (1,642) | 12% (295) |
Top 3 California county sites by security score
#1 in California · U.S. rank 1
Alpine County, CA
A 100 security
- Accessibility A
- Botability B
- Security A
- Usability F
- Readability A
#1 in California · U.S. rank 1
County of Solano, CA
A 100 security
- Accessibility A
- Botability B
- Security A
- Usability C
- Readability F
#1 in California · U.S. rank 1
Fresno County, CA
A 100 security
- Accessibility A
- Botability A
- Security A
- Usability F
- Readability A
What each check means
- Errors in the console. The page loads without JavaScript or network errors. Site may have hidden bugs that break features.
- Sponsored top-level domain (sTLD). The site uses a government-issued domain (.gov, .edu, or .mil). People cannot tell if your site is real government.
- X-Content-Type-Options. The site tells browsers not to guess the type of files it serves. Browsers might run dangerous files by mistake.
- Security.txt. The site has a security.txt file so researchers know how to report issues. Security researchers cannot report problems to you.
All California county sites by security score
| Rank | Site | Checks passed | Grade |
|---|---|---|---|
| 1 |
alpinecountyca.gov
Alpine County, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
solanocounty.gov
County of Solano, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
fresnocountyca.gov
Fresno County, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
lakecountyca.gov
Lake County, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
lassencounty.gov
Lassen County, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
mariposacounty.gov
Mariposa County, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
mendocinocounty.gov
Mendocino County, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
countyofmodoc.gov
Modoc County, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
monocounty.ca.gov
Mono County, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
nevadacountyca.gov
Nevada County, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
saccounty.gov
Sacramento County, CA U.S. rank 1 |
7 of 7 checks pass | A |
| 1 |
sierracounty.ca.gov
Sierra County, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 1 |
tehama.gov
Tehama County, CA U.S. rank 1 |
8 of 8 checks pass | A |
| 2 |
rivco.gov
Riverside County, CA U.S. rank 2 |
8 of 9 checks pass | B |
| 3 |
countyofcolusaca.gov
Colusa County, CA U.S. rank 3 |
7 of 8 checks pass | B |
| 3 |
eldoradocounty.ca.gov
El Dorado County, CA U.S. rank 3 |
7 of 8 checks pass | B |
| 3 |
humboldtgov.org
Humboldt County, CA U.S. rank 3 |
7 of 8 checks pass | B |
| 3 |
parks.marincounty.gov
Marin County Parks, CA U.S. rank 3 |
7 of 8 checks pass | B |
| 3 |
placer.ca.gov
Placer County, CA U.S. rank 3 |
7 of 8 checks pass | B |
| 3 |
plumascounty.us
Plumas County, CA U.S. rank 3 |
7 of 8 checks pass | B |
| 3 |
santacruzcountyca.gov
Santa Cruz County, CA U.S. rank 3 |
7 of 8 checks pass | B |
| 3 |
trinitycounty.org
Trinity County, CA U.S. rank 3 |
7 of 8 checks pass | B |
| 4 |
inyocounty.us
Inyo County, CA U.S. rank 5 |
7 of 9 checks pass | C |
| 4 |
venturacounty.gov
Ventura County, CA U.S. rank 5 |
7 of 9 checks pass | C |
| 5 |
buttecounty.net
Butte County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
calaverasgov.us
Calaveras County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
imperialcounty.org
Imperial County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
lacounty.gov
Los Angeles County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
countyofmerced.com
Merced County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
ocgov.com
Orange County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
main.sbcounty.gov
San Bernardino County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
sf.gov
San Francisco, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
slocounty.ca.gov
San Luis Obispo County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
countyofsb.org
Santa Barbara County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
siskiyoucounty.gov
Siskiyou County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
stancounty.com
Stanislaus County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 5 |
yuba.gov
Yuba County, CA U.S. rank 6 |
6 of 8 checks pass | C |
| 6 |
acgov.org
Alameda County, CA U.S. rank 9 |
5 of 8 checks pass | D |
| 6 |
co.del-norte.ca.us
Del Norte County, CA U.S. rank 9 |
5 of 8 checks pass | D |
| 6 |
sjgov.org
San Joaquin County, CA U.S. rank 9 |
5 of 8 checks pass | D |
|
amadorgov.org
Amador County, CA |
Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 | - | |
|
contracosta.ca.gov
Contra Costa County, CA |
Not fully scanned, so not graded. We weren't able to fully scan your site. Status 999 | - | |
|
sdparks.org
County of San Diego, CA |
Not fully scanned, so not graded. We couldn't scan your site because the page never finished loading in our browser. Status 994 | - | |
|
sddac.com
County of San Diego, CA |
Not fully scanned, so not graded. We couldn't scan your site because the page never finished loading in our browser. Status 994 | - | |
|
sandiegocounty.gov
County of San Diego, CA |
Not fully scanned, so not graded. We weren't able to fully scan your site. Status 999 | - | |
|
countyofglenn.net
Glenn County, CA |
Not fully scanned, so not graded. We couldn't scan your site because it showed our bot a captcha or browser check instead of the page. Status 996 | - | |
|
kerncounty.com
Kern County, CA |
Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 | - | |
|
countyofkingsca.gov
Kings County, CA |
Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 | - | |
|
maderacounty.com
Madera County, CA |
Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 | - | |
|
marincounty.gov
Marin County, CA |
Not fully scanned, so not graded. We couldn't scan your site because it showed our bot a captcha or browser check instead of the page. Status 996 | - | |
|
countyofmonterey.gov
Monterey County, CA |
Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 | - | |
|
napacounty.gov
Napa County, CA |
Not fully scanned, so not graded. We couldn't fully scan your site because it responded without any page content. Status 995 | - | |
|
sanbenitocountyca.gov
San Benito County, CA |
Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 | - | |
|
shastacounty.gov
Shasta County, CA |
Not fully scanned, so not graded. We couldn't scan your site because it showed our bot a captcha or browser check instead of the page. Status 996 | - | |
|
suttercounty.org
Sutter County, CA |
Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 | - | |
|
tuolumnecounty.ca.gov
Tuolumne County, CA |
Not fully scanned, so not graded. We couldn't scan your site because it showed our bot a captcha or browser check instead of the page. Status 996 | - | |
|
yolocounty.gov
Yolo County, CA |
Not fully scanned, so not graded. We weren't able to fully scan your site. Status 403 | - |
About security
Secure your site and protect users with proper security practices.
Why it's important
Strong defenses prevent hackers from stealing personal information and other confidential data.
Risks
- Hackers can steal private information from your site.
Guidance
What we use to grade security:
- CISA Website Security
- 21st Century Integrated Digital Experience Act (IDEA)
- CISA Cybersecurity Performance Goals
- RFC 9116
- OWASP Top 10
- U.S. Federal Website Standards
Standards
- Content security policy (CSP)
- HTTP Strict Transport Security (HSTS)
- security.txt
- X-Content-Type-Options
- Errors in the console
- Clickjacking mitigation
- Paste preventing inputs
- Hypertext Transfer Protocol Secure (HTTPS)
- Sponsored top-level domain (sTLD)
Grades/scores
ScanGov
About this ranking
About this data
ScanGov scans the homepage of each county site on our county list in California. Scores come from the checks in the ScanGov standards. Sites were scanned between 9/30/2026 and 11/6/2026. Each site's report shows its own scan date. A site counts as fully scanned when its homepage loaded and sent us its page content. Averages, grade shares, failure rates, and ranks use fully scanned sites only. We could not fully scan 17 sites. They did not respond, blocked the scanner, or sent no page content. They appear in the table without grades, with their scan status, and are left out of every figure. Grades follow the ScanGov grade scale. Rank follows the ScanGov ranking method. The full dataset, with every county's raw results, is in the ScanGov data repository.