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Alameda County, California

Plumbing in Alameda County, California

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Browse 560 verified plumbing contractors registered across Alameda County, California (including Oakland, Fremont, Hayward, Berkeley). Every record is compiled from California Contractors State License Board (CA CSLB) public credential files under California Business and Professions Code Division 3, Chapter 9 (Contractors License Law: Class A, Class B General Building, and Class C Specialty Classifications with $25,000 Bond Requirement).

Official State Authority: California Contractors State License Board (CA CSLB) Official Registry · County Seat: Oakland

Municipalities in Alameda County (24)

Select a city or town in Alameda County to view local permit guidance and registered plumbing records:

Oakland 110Hayward 69San Leandro 56Livermore 47Fairfield 35Vallejo 28Fremont 27Alameda 21Castro Valley 20Pleasanton 20Berkeley 18Dublin 13Newark 12San Lorenzo 10Rio Vista 9Bay Point 8Benicia 8Union City 8Discovery Bay 6Rodeo 6Clayton 5Pacheco 5Emeryville 4Suisun City 4

560 plumbing records · Alameda County, CA

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Public Directory Quality: Official CA CSLB license records across Alameda County · Zero sponsored order · Never sold as a lead · How our data works →

Plumbing directory — Alameda County

560 matching records across 24 open municipalities · 25 on this page · Contactable records first, then alphabetical.

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Show registered-address map (25 records on this page)21 approximate areas

Shaded areas mark approximate postal or city locations, not premises or service areas. Circle sizes are illustrative, not postal boundaries. Some records share the same area. Private addresses are excluded.

2ZIP 945362ZIP 945772ZIP 945332ZIP 945681ZIP 946011ZIP 945021ZIP 945531ZIP 945341ZIP 946191ZIP 945601ZIP 945801ZIP 947101ZIP 946211ZIP 947091ZIP 946061ZIP 945111ZIP 945441ZIP 94517Approximate postal/city centroid schematic (21 areas)

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Frequently Asked Questions — Alameda County, CA

How are plumbing credentials verified in Alameda County, California?

Records across Alameda County are sourced directly from the California Contractors State License Board (CA CSLB). California Business and Professions Code Division 3, Chapter 9 (Contractors License Law: Class A, Class B General Building, and Class C Specialty Classifications with $25,000 Bond Requirement)

Which municipalities are covered in the Alameda County directory?

Alameda County coverage includes Oakland, Fremont, Hayward, Berkeley, San Leandro, Livermore, Pleasanton, Alameda, Union City, Dublin, with County Seat in Oakland.

Are licensed contractors in Alameda County, CA required to carry insurance and surety bonds?

Yes. Under California licensing authority regulations, licensed plumbing contractors typically must maintain active Commercial General Liability insurance, appropriate surety bonds, and state Workers' Compensation coverage before pulling municipal permits.

Other Counties in California

Los Angeles CountySan Diego CountyOrange CountySanta Clara CountySan Francisco CountySacramento CountyRiverside CountySan Bernardino CountyContra Costa CountySan Mateo CountyVentura CountyFresno CountyKern CountySonoma CountyStanislaus CountyMonterey CountySanta Barbara CountyButte CountyShasta CountyHumboldt County

Before the first call

  • Describe the job and ask whether it is within their scope and service area.
  • Check the credential with its issuing authority and ask what applies where the work will happen.
  • Ask about insurance, availability, who will do the work, and a written scope.
  • Ask about callout fees, labor or fixed rates, materials, cancellation and any estimate charge.
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Verification Overview & Key Takeaways: How to Check Official Credentials

HomeCrafto displays source records with different scopes, including licenses, registrations, municipal permits and community records. A source entry is not proof of qualification for your job. Before signing a work order or paying a deposit, homeowners should confirm that the contractor’s credential number is active, verify that the license classification covers the specific trade scope required for the job, and request a current Certificate of Insurance (COI) directly from the issuing insurance carrier. Independent verification protects your property and ensures compliance with local building codes.

How do you verify a contractor license number and insurance on official portals (FAQ)?

You can verify active license standing and consumer protection rules directly through official government portals, including Washington L&I Contractor Verify, the California Contractors State License Board (CSLB), the Connecticut eLicense Portal, USA.gov State Consumer Protection Offices, and FTC Home Improvement Consumer Guidance. Always confirm municipal permit requirements with your local building department before work begins.