Clark John A, C-61/D-21 Machinery and Pumps Contractor in Windsor, CA
Clark John A operating as a sole owner holds an active California contractor license (CSLB #1063307), valid through Feb 29, 2028. First issued in 2020, the license has been on the CSLB roster for 6 years. It carries a single CSLB classification: C-61/D-21 — Machinery and Pumps Contractor. Records show an active surety bond on file with Atlantic Specialty Insurance Company and an exempt workers' compensation status (no employees on payroll). The business is based in Windsor, in Sonoma County, California.
- License Number
- 1063307
- Issued
- Feb 13, 2020
- Status
- CLEAR
- Expires
- Feb 29, 2028
- Entity
- Sole Owner
- Surety
- Atlantic Specialty Insurance Company
- Bond Number
- 810025858
- Effective
- Jun 17, 2025
- Status
- Active
- Coverage
- Exempt
- Carrier
- —
- Policy Number
- —
- Effective
- Feb 1, 2026
- Expires
- —
This contractor warrants a closer look before contracting:
- Workers' comp listed as exempt
An automated summary of public CSLB data, not a credit score, rating, or endorsement. How we determine this
Is Clark John A licensed in California?
Yes. Clark John A holds California Contractors State License Board license number 1063307, which is active and in good standing. The license was first issued on February 13, 2020. It is valid through February 29, 2028.
What does Clark John A specialize in?
Clark John A is licensed for one CSLB classification: C-61/D-21 Machinery and Pumps Contractor.
Where is Clark John A headquartered?
Clark John A is headquartered at 9592 Vancouver Lane, Windsor, CA 95492, in Sonoma County, California.
Does Clark John A have an active surety bond on file with CSLB?
Yes. Clark John A has an active California contractor surety bond filed with Atlantic Specialty Insurance Company.
Does Clark John A carry workers' compensation coverage?
Clark John A reports an exempt workers' compensation status, meaning the business has no employees on payroll.
How do I verify Clark John A's contractor license?
You can verify Clark John A's license directly with the California Contractors State License Board at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=1063307.
- License issuedFeb 13, 2020
- Bond activeJun 17, 2025
- WC coverage startsFeb 1, 2026
- License expiresFeb 29, 2028
- Nor-Cal Pumpworks LLC#1116645Petaluma·C-12 Earthwork and Paving Contractor
- Weeks Drilling and Pump CO#177681Sebastopol·C-36 Plumbing Contractor
- Ongaro & Sons#215233Petaluma·C-4 Boiler, Hot Water Heating and Steam Fitting Contractor
- Petersen Les Drilling & Pump INC#261084Santa Rosa·A General Engineering Contractor
- Sissel Jack Pump Service LLC#331736Graton·C-61/D-21 Machinery and Pumps Contractor
- Larbre Well Drilling and Pumps INC#348203Sonoma·C-57 Well Drilling Contractor
- Sonoma County Pump#414579Sebastopol·C-61/D-21 Machinery and Pumps Contractor
- Miller Manufacturing Incorporated#500553Rohnert Park·C-61/D-21 Machinery and Pumps Contractor
Working a California job with Clark John A, or chasing an unpaid invoice? These free tools track your mechanics lien deadlines and rights under California Civil Code §§8200–8848.
- California preliminary notice deadline calculatorFind your 20-day deadline and the lien rights at risk.
- Do I need a preliminary notice in California?Answer a few questions to see if the 20-day notice applies.
- Did I lose my California lien rights?Check whether your mechanics lien window has passed.
- Unpaid construction invoice in CaliforniaYour options and deadlines for collecting on a California job.
Own Clark John A? Claim or correct this profile