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Sonoma County, California

Plumbing in Sonoma County, California

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Browse 502 verified plumbing contractors registered across Sonoma County, California (including Santa Rosa, Petaluma, Rohnert Park, Windsor). 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: Santa Rosa

Municipalities in Sonoma County (24)

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

Santa Rosa 117Novato 52San Rafael 44Napa 38Petaluma 34Windsor 27Rohnert Park 26Sebastopol 24Sonoma 19Ukiah 11Willits 10American Canyon 8Cloverdale 8Fairfax 7Healdsburg 7Cotati 6Fort Bragg 6Hidden Valley Lake 6Lakeport 6Mill Valley 6Corte Madera 5Kelseyville 4Sausalito 4Guerneville 3

502 plumbing records · Sonoma County, CA

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

Plumbing directory — Sonoma County

502 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)20 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 954012ZIP 949492ZIP 954052ZIP 949452ZIP 945581ZIP 954701ZIP 954071ZIP 949301ZIP 954041ZIP 954921ZIP 949281ZIP 949031ZIP 954361ZIP 949471ZIP 945591ZIP 954901ZIP 949521ZIP 94931Approximate postal/city centroid schematic (20 areas)

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Frequently Asked Questions — Sonoma County, CA

How are plumbing credentials verified in Sonoma County, California?

Records across Sonoma 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 Sonoma County directory?

Sonoma County coverage includes Santa Rosa, Petaluma, Rohnert Park, Windsor, Healdsburg, Sonoma, Sebastopol, Cloverdale, Cotati, Occidental, with County Seat in Santa Rosa.

Are licensed contractors in Sonoma 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 CountyAlameda CountyRiverside CountySan Bernardino CountyContra Costa CountySan Mateo CountyVentura CountyFresno CountyKern 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.