Public CSLB records

R H Hydronics, C-4 Boiler, Hot Water Heating and Steam Fitting Contractor in San Rafael, CA

License #951610·Sole Owner·San Rafael, Marin County
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Summary

R H Hydronics operating as a sole owner holds California contractor license #951610, which is currently expired (lapsed Aug 31, 2026) and not valid to contract until it is renewed. First issued in 2010, the license has been on the CSLB roster for 16 years. It carries a single CSLB classification: C-4 — Boiler, Hot Water Heating and Steam Fitting Contractor. Records show an active surety bond on file with North River Insurance Company (the) and a previously-filed workers' compensation policy with Norguard Insurance Company that is no longer active. The business is based in San Rafael, in Marin County, California.

Business Information
Address
35 A Mark Drive
San Rafael, CA 94903
License Details & Classifications
License Number
951610
Issued
Aug 25, 2010
Status
CLEAR
Expires
Aug 31, 2026
Entity
Sole Owner
Financial & Insurance Coverage
Contractor Bond
Surety
North River Insurance Company (the)
Bond Number
04CF621047
Effective
Aug 15, 2023
Status
Active
Workers' Compensation
Coverage
Workers' Compensation Insurance
Carrier
Norguard Insurance Company
Policy Number
ROWC651155
Effective
Sep 8, 2025
Expires
Sep 8, 2026
Alert

This contractor has a compliance issue in its public CSLB record:

  • License expired
  • No active workers' comp on file
License StatusInactive / Expired
Contractor BondOn file
Workers' CompensationInactive

An automated summary of public CSLB data, not a credit score, rating, or endorsement. How we determine this

Frequently asked questions
Is R H Hydronics licensed in California?

R H Hydronics previously held California Contractors State License Board license number 951610, but the license expired on August 31, 2026 and is not currently valid. It was first issued on August 25, 2010.

What does R H Hydronics specialize in?

R H Hydronics is licensed for one CSLB classification: C-4 Boiler, Hot Water Heating and Steam Fitting Contractor.

Where is R H Hydronics headquartered?

R H Hydronics is headquartered at 35 A Mark Drive, San Rafael, CA 94903, in Marin County, California.

Does R H Hydronics have an active surety bond on file with CSLB?

Yes. R H Hydronics has an active California contractor surety bond filed with North River Insurance Company (the).

Does R H Hydronics carry workers' compensation coverage?

R H Hydronics has a previously-filed workers' compensation policy with Norguard Insurance Company that is no longer active.

How do I verify R H Hydronics's contractor license?

You can verify R H Hydronics's license directly with the California Contractors State License Board at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=951610.

Activity Timeline
  1. License issuedAug 25, 2010
  2. Bond activeAug 15, 2023
  3. WC coverage startsSep 8, 2025
  4. License expiredAug 31, 2026
  5. WC expiredSep 8, 2026
Other contractors in Marin County
California lien & payment resources

Working a California job with R H Hydronics, or chasing an unpaid invoice? These free tools track your mechanics lien deadlines and rights under California Civil Code §§8200–8848.

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