| ua.org | The United Association of Plumbers and Pipefitters (UA) |
| sfbctc.org | San Francisco Building And Construction Trades Council |
| ca.gov | Contractors State License Board |
| calaborfed.org | California Labor Federation, AFL-CIO |
| buildingtrades.org | Building And Construction Trades Department, Afl-cio |
| aflcio.org | Afl-cio |
| unionyes.org | San Diego - Imperial Counties Labor Council |
| njatc.org | National Joint Apprenticeship and Training Committee |
| necanet.org | NECA - National Electrical Contractors Association |
| ibewninthdistrict.org | IBEW Ninth District |
United States , ,