Online Resources

Labor and Union related

United Association of Plumbers and Steamfitters
AFL-CIO
Yahoo Labor Index

California Labor Code

Contractor related

Mechanical Contractors Association of America (MCAA) 
National Association of Plumbing, Heating and Cooling Contractors (PHCC)
International Association of Plumbing and Mechanical Officials (IAPMO)
Contractors State Licensing Board

California Public Contract Code

Government Related

Bureau of Labor Statistics
OSHA
OSHA Compliance History Information Service

California Department of Industrial Relations
California Employment Development Department
California Government Web Resources

Association of Bay Area Governments
Solano Economic Development Corporation