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State files updated Oct 31, 2026
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California contractor license

Optimized Plumbing & Piping Inc

Optimized Plumbing & Piping Inc of Sonora holds California license 982621 (C4 Boiler, Hot Water Heating and Steam Fitting, C20 Warm-Air Heating, Ventilating and Air-Conditioning, C36 Plumbing). The CSLB file dated Oct 31, 2026 lists it as active.1 It expires Sep 30, 2027.

Licensed 13 years, longer than 56% of 9,636 active California plumbing contractors.

Active

Optimized Plumbing & Piping Inc, Sonora

License
982621
Class
C4 Boiler, Hot Water Heating and Steam Fitting; C20 Warm-Air Heating, Ventilating and Air-Conditioning; C36 Plumbing
Expires
Sep 30, 2027
Bond
$25,000
Workers' comp
Insured to Jun 8, 2027

CSLB file dated Oct 31, 2026

From the CSLB file dated Oct 31, 2026. Not a consumer report; check the board before you hire.

Has the board taken action on this license?

None in the CSLB file dated Oct 31, 2026. Confirm with the board: CSLB license check

What bond, insurance and workers' comp are on file?

Bond
$25,000Western Surety Company, from Jan 11, 2024, continuous
Liability insurance
Not in the CSLB fileCheck with the board
Workers' comp
InsuredState Compensation Insurance Fund, from Jun 8, 2023, to Jun 8, 2027

Who is on this license?

Officer
Danielle C. McQuinnSince Sep 26, 2013
Responsible managing officer, CEO and president
Curtis A. McQuinnSince Apr 10, 2013
Responsible managing officer
Ralph T. McQuinnSince Sep 26, 2013

What work does this license cover?

Issued Apr 10, 2013. Reissued Sep 26, 2013.

Which other Sonora businesses hold C4 Boiler, Hot Water Heating and Steam Fitting?

California plumbing contractorsCalifornia HVAC contractors

What should you check before hiring?

What to ask before you hire

  1. Get the license number in writing. The name on the license should match the name on your contract and invoice.
  2. Check the class covers the job. A license for one trade doesn't cover another. California license classes
  3. Ask for a certificate of insurance sent to you by the insurance agent, not handed over by the contractor. How to read a COI
  4. Ask who will be on site. If a crew works on your property, ask for proof of workers' comp. An exemption on file means the contractor told the CSLB it has no employees.
  5. Put it in a written contract: license number, price, start date and payment schedule. Check the license again on the day you sign.

If the license is lapsed

  1. Don't sign or pay a deposit until the CSLB shows the license active again.
  2. Ask the contractor why. For a bond or insurance lapse, ask for proof that the new bond or policy was filed with the CSLB, then check again.
  3. If work has started, hold further payments, keep the contract, receipts and photos, and file a complaint with Contractors State License Board (CSLB).
  4. Check another contractor. California license lookup

Sources

  1. CSLB License Master (cslb.ca.gov, Oct 31, 2026)
  2. Contractors State License Board (CSLB)