Pressure and urgency
A stranger at the door, a deal that expires today, or a push to decide before you can get other bids or check the license.
Homeowner guide
How to check a plumber's license in California
Every plumber you hire in Fountain Valley should hold an active California C-36 Plumbing license, and you can check one for free on the Contractors State License Board website in under a minute.
Call (657) 669-4766Request service
Written and fact-checked by John, editor, MBA in marketing
Updated against City, utility and state sources
Quick answer
Ask for the license number, then look it up at cslb.ca.gov or call the CSLB at 800-321-CSLB (2752). Confirm the status is active, the classification includes C-36 Plumbing, the $25,000 contractor's bond is on file, and workers' compensation is listed. In California, a home improvement down payment cannot exceed $1,000 or 10 percent of the price, whichever is less.
- License type
- C-36 Plumbing
- Lookup
- cslb.ca.gov or 800-321-2752
- Contractor's bond
- $25,000
- Down payment cap
- 10% or $1,000, whichever is less
How to check a California plumbing license in five steps
Get the license number from the plumber, enter it on the CSLB website, and read four fields: status, classification, bond and workers' compensation.
Ask for the license number
Any licensed contractor can give it to you on the phone. The CSLB also suggests asking to see the contractor's pocket license and a current photo ID when they arrive. Hesitation at this step is a warning sign on its own.
Look it up at cslb.ca.gov
The Contractors State License Board is the California agency that licenses contractors. Its website has a free license lookup. You can also call the CSLB at 800-321-CSLB (2752). CSLB materials also point to CheckTheLicenseFirst.com.
Confirm the license is current and active
The CSLB says to make sure the license is current, active and unrestricted, and that it covers the specific type of work you are hiring for. For plumbing, that means the C-36 Plumbing classification.
Check the bond and workers' compensation
The license detail page shows the contractor's bond, any bond of qualifying individual, and the workers' compensation status. More on what each means below.
Match the details
The business name and address on the license should match the name on the truck, the estimate and the contract. A different name can mean the license belongs to someone else.
What a C-36 plumbing license covers
The C-36 Plumbing Contractor license covers safe water supply, waste removal, gas piping and appliances, water heating equipment and the safety devices on those systems.
The CSLB's classification, from Title 16 of the California Code of Regulations, says a plumbing contractor provides a means for a supply of safe water, ample in volume and of suitable temperature, and the proper disposal of fluid waste from the premises. The classification includes, but is not limited to:
- complete removal of waste from the premises, including on-site waste disposal systems
- piping, storage tanks and venting for gases and liquids, including vacuum, compressed air and gases for medical, dental, commercial and industrial uses
- all gas appliances, flues and gas connections, not including forced warm air units
- water and gas piping from the property owner's side of the utility meter to the structure
- installation of any equipment to heat water, including solar water heating
- maintenance and replacement of these items and health and safety devices such as gas earthquake valves, gas control valves, backflow preventers, water conditioning equipment and regulating valves
| Job | Covered by C-36 language | Our page |
|---|---|---|
| Water heater replacement | Equipment to heat water; gas connections | Water heater repair |
| Gas leak repair, new gas line | Gas piping from the owner's side of the meter | Gas line plumber |
| Repiping a 1960s slab home | Supply of safe water | Whole-house repiping |
| Sewer lateral repair | Removal of waste from the premises | Sewer line repair |
| Water softener install | Water conditioning equipment | Water softeners |
| Earthquake gas valve, backflow preventer | Health and safety devices | Commercial plumbing for backflow |
A general building contractor or a handyman is not the same thing. If the job is plumbing or gas work, look for C-36 on the license. The CSLB also notes that California does not recognize contractor licenses from other states, so an out-of-state license number does not count here.
How to read the CSLB license detail page
The license detail page lists the business, the license dates and status, the classifications, the bonds, workers' compensation and liability insurance information.
| Field | What to look for |
|---|---|
| Data current as of | The date the record was pulled. Recent is good. |
| Business information | Name, address and phone. These should match the estimate and the contract. |
| Entity | The type of business that holds the license. The contract should be with this business. |
| Issue date and expire date | An expire date in the past is a problem. |
| License status | You want active and in good standing, without restrictions or suspensions noted. |
| Classifications | C-36 Plumbing for plumbing and gas work. |
| Bonding information | The contractor's bond, plus an LLC worker bond or bond of qualifying individual where they apply. |
| Workers' compensation | A policy on file, or an exemption statement if the contractor has no employees. |
| Liability insurance information | Shown when reported. Ask about it either way. |
| Other | Additional notes or actions, if any. |
The detail page also notes that CSLB complaint disclosure is restricted by law, so the absence of a listed complaint is not proof there were none. The CSLB says its lookup includes information on pending or prior disciplinary actions. For a fuller legal action history, the CSLB lists a disclosure line for its Southern Region at (562) 345-7656.
Bonds, workers' compensation and insurance, explained
A license bond is a $25,000 bond the CSLB requires of every contractor; workers' compensation is required when the contractor has employees; liability insurance is something you should ask about separately.
The contractor's bond
The CSLB requires a contractor's bond of $25,000. It protects consumers for defective construction and other license law violations, and protects employees for unpaid wages. Licenses qualified by a responsible managing employee, or by a responsible managing officer who owns less than 10 percent of the voting stock, also need a $25,000 bond of qualifying individual.
The bond is not insurance for your house. It is a limited fund tied to license law violations, so treat it as a minimum, not full protection.
Workers' compensation and liability
The CSLB says contractors with employees must carry workers' compensation. Contractors without employees generally are not required to, though some classifications must carry it regardless. If an uninsured worker is hurt on your property, that is a problem you do not want. The license detail page notes that a certificate or exemption may have been received but not yet processed, so ask if what you see looks wrong.
The CSLB also suggests asking whether the contractor has general liability insurance in case of accidental damage during the job.
California home improvement contract rules and the down payment limit
In California, a home improvement down payment cannot exceed $1,000 or 10 percent of the contract price, whichever is less, and projects over $500 must be in a written contract.
These rules come from the CSLB's consumer guides. They are the ones homeowners in Fountain Valley most often ask about:
- Written contract
- Required for home improvement projects over $500, labor and materials combined
- Down payment
- No more than $1,000 or 10 percent of the contract price, whichever is less, excluding finance charges
- Exception
- Contractors with a blanket performance and payment bond on file with the CSLB, which shows on the license detail page
- Progress payments
- Payments cannot exceed the value of the work performed
- Right to cancel
- 3 business days, or 5 business days if the buyer is 65 or older, by written notice; money paid must be returned within 10 days
- Contract contents
- License number, address and phone, a payment schedule, start and completion dates, and a Mechanics Lien Warning
- License threshold
- Home improvement work valued at $1,000 or more, labor and materials combined, must be done by a licensed contractor (CSLB guide for seniors, January 2025 edition)
Service and repair contracts are different
Many plumbing calls are repairs, not projects. The CSLB explains that for a service and repair contract, such as an emergency or short-notice repair, the right to cancel is voided once the contract is signed and the contractor begins work. That is fair for a burst pipe at midnight, but it is also why you should read the price before you sign. On our emergency calls, you get a written price before work starts.
For a larger planned job, like a repipe or sewer replacement, the CSLB suggests not letting the contractor begin work or pull permits during the cancellation period, tying each payment to a completed phase, holding the final payment until the job meets the contract, and keeping a job file with photos, papers and payment records.
Red flags when hiring a plumber
The CSLB's biggest warning signs are door-to-door or high-pressure sales, cash-only payment, large down payments and no written contract.
Cash only
The CSLB warns about contractors who insist on cash, sometimes even offering to drive you to the bank.
Big money up front
A request for more than 10 percent or $1,000 down, whichever is less, unless the contractor has a blanket bond on file.
No written contract
A suggestion that you do not need one. For home improvement projects over $500, the CSLB says you do.
The free inspection that finds a disaster
The CSLB describes a scam where a free water pressure check is staged by secretly shutting off the water. A real problem can be shown to you, photographed and priced in writing.
License that does not match
No license, a license not in good standing, the wrong classification, or a name that differs from the estimate.
The CSLB closes one of its scam guides with a simple rule: if it sounds too good to be true, it probably is. It also notes that new contractors have had to pass a criminal background check since 2005, and that qualifying for a license requires four years of journey-level experience. Those are real hurdles, which is why checking the license tells you something.
Licenses and City of Fountain Valley permits
A licensed plumber pulls the City permit for work that needs one; the license and the permit together are what protect you at inspection and at sale.
The City of Fountain Valley requires a permit to install, alter, repair or replace plumbing and gas systems. The Building Division is at City Hall, 10200 Slater Ave, phone 714-593-4429, open Monday to Thursday, 7 a.m. to 6 p.m., closed Fridays, and it also takes applications through its online Permit Center. The City's permit forms include a Sub-Contractors Form and an Owner-Builder Form.
The CSLB suggests confirming that your contractor will get all the necessary permits from your local building department. If a plumber offers a lower price to skip the permit, or asks you to pull the permit in your own name, ask why. Unpermitted water heaters, gas lines and repipes tend to come up later, at an insurance claim or when you sell. Our Fountain Valley plumbing permit guide lists which jobs need a permit.
Checklist before you hire a plumber in Fountain Valley
Run through this list on any plumbing job bigger than a quick repair.
- License number checked at cslb.ca.gov: active, C-36 Plumbing, name and address match
- $25,000 contractor's bond on file
- Workers' compensation on file, or an exemption that makes sense for a one-person business
- Liability insurance confirmed
- Written price before work starts, with the scope spelled out
- Down payment no more than $1,000 or 10 percent, whichever is less
- Payment schedule tied to completed work
- City permit included when the job needs one
- For larger jobs, at least three bids and references, as the CSLB recommends
- A job file with the contract, photos, payments and the final permit sign-off
Published price ranges help you spot an estimate that is far out of line. Our Fountain Valley plumbing costs guide collects them in one place.
What to do if something goes wrong
Talk to the contractor first, in writing; if that fails, you can file a complaint with the CSLB online or by phone.
Put it in writing
Describe the problem, attach photos, and reference the contract. Keep a copy in your job file.
Give the contractor a chance to fix it
Many problems are honest mistakes that a licensed contractor will correct, especially with a permit and inspection still open.
File with the CSLB
The CSLB takes complaints through cslb.ca.gov, by a printed form from the site, or by calling 800-321-CSLB (2752) to request a form and its complaint guide.
Talk to the City about permit issues
If work that needed a permit was done without one, the Building Division at 714-593-4429 can explain how to get it inspected.
Have a question about a plumber we scheduled? Contact us with the job address and date, and ask for the license number of the contractor who did the work.
Water where it shouldn't be? Call now.
A real person answers 24 hours a day. You get an honest arrival window and a written price before any work starts.
Questions Fountain Valley homeowners ask
How do I check if a plumber is licensed in California?
Ask for the license number and look it up free at cslb.ca.gov, or call the Contractors State License Board at 800-321-CSLB (2752). Confirm the license is active, includes the C-36 Plumbing classification, and shows a contractor's bond and workers' compensation status.
What license does a plumber need in California?
A plumbing contractor needs a C-36 Plumbing Contractor license from the CSLB. It covers water supply, waste removal, gas piping from the owner's side of the meter, water heaters and safety devices like gas earthquake valves and backflow preventers.
How much can a contractor ask for as a down payment in California?
No more than $1,000 or 10 percent of the contract price, whichever is less, on a home improvement contract. The exception is a contractor with a blanket performance and payment bond on file with the CSLB, which the license detail page shows.
Does a plumber have to have workers' comp in California?
If the plumber has employees, yes. The CSLB says contractors with employees must carry workers' compensation, while those without employees generally are not required to. The license detail page shows a policy or an exemption on file.
How much is a California contractor's bond?
The CSLB requires a $25,000 contractor's bond. It protects consumers for defective construction and other license law violations and protects employees for unpaid wages. It is not insurance for your home, so ask about liability insurance too.
Can I cancel a contract with a plumber?
For a home improvement contract, you have 3 business days to cancel in writing, or 5 if you are 65 or older. For a service and repair contract, like an emergency repair, the CSLB says that right is voided once you sign and the work begins.
Does the CSLB show complaints against a contractor?
Partly. The CSLB lookup shows pending or prior disciplinary actions, but the license page notes that complaint disclosure is restricted by law. For more history, the CSLB lists a legal action disclosure line for its Southern Region at (562) 345-7656.
Is Fountain Valley Plumber a licensed contractor?
Fountain Valley Plumber is a local plumbing service and scheduling line. Work is done by independent CSLB-licensed C-36 plumbing contractors. Ask for the license number on any job and check it at cslb.ca.gov before work starts.
Sources
Facts on this page come from these public sources, checked October 31, 2026.
- CSLB, C-36 Plumbing Contractor classification
- CSLB, Home Improvement Contracts consumer guide
- CSLB, What Seniors Should Know (January 2025)
- CSLB, What You Should Know Before You Hire a Contractor
- CSLB, Don't Be Fooled by Contractor Scams
- CSLB, bond requirements
- CSLB, sample contractor's license detail page (field labels)
- City of Fountain Valley Building Division
- City of Fountain Valley, Permits and Handouts