Water Supply and Irrigation Systems, Sewage Treatment Facilities, New Multifamily Housing Construction (except Operative Builders), New Housing Operative Builders, Residential Remodelers

Water Supply and Irrigation Systems, Sewage Treatment Facilities, Water and Sewer Line and Related Structures Construction

Sewage Treatment Facilities, Water and Sewer Line and Related Structures Construction, Structural Steel and Precast Concrete Contractors

Hydroelectric Power Generation, Fossil Fuel Electric Power Generation, Nuclear Electric Power Generation, Electric Bulk Power Transmission and Control, Electric Power Distribution

Beef Cattle Ranching and Farming, Logging, Water Supply and Irrigation Systems, Sewage Treatment Facilities, Water and Sewer Line and Related Structures Construction

Sewage Treatment Facilities, Industrial Building Construction, Commercial and Institutional Building Construction, Other Heavy and Civil Engineering Construction, Site Preparation Contractors

Natural Gas Distribution, Water Supply and Irrigation Systems, Sewage Treatment Facilities, Steam and Air-Conditioning Supply, New Single-Family Housing Construction (except Operative Builders)

Logging, Dimension Stone Mining and Quarrying, Crushed and Broken Limestone Mining and Quarrying, Crushed and Broken Granite Mining and Quarrying, Construction Sand and Gravel Mining

Sewage Treatment Facilities, Industrial Machinery and Equipment Merchant Wholesalers, Industrial Supplies Merchant Wholesalers

Water Supply and Irrigation Systems, Sewage Treatment Facilities, Water and Sewer Line and Related Structures Construction, Land Subdivision, Highway, Street, and Bridge Construction

Water Supply and Irrigation Systems, Sewage Treatment Facilities, All Other Specialty Trade Contractors, Facilities Support Services

Timber Tract Operations, Sewage Treatment Facilities, Water and Sewer Line and Related Structures Construction, Highway, Street, and Bridge Construction, Site Preparation Contractors

Fossil Fuel Electric Power Generation, Nuclear Electric Power Generation, Other Electric Power Generation, Electric Power Distribution, Natural Gas Distribution

Water Supply and Irrigation Systems, Sewage Treatment Facilities, Engineering Services, Drafting Services, Surveying and Mapping (except Geophysical) Services

Water Supply and Irrigation Systems, Sewage Treatment Facilities, New Multifamily Housing Construction (except Operative Builders), New Housing Operative Builders, Industrial Building Construction

Water Supply and Irrigation Systems, Sewage Treatment Facilities, Water and Sewer Line and Related Structures Construction, Poured Concrete Foundation and Structure Contractors, Framing Contractors

Logging, Construction Sand and Gravel Mining, Water Supply and Irrigation Systems, Sewage Treatment Facilities, New Single-Family Housing Construction (except Operative Builders)

Water Supply and Irrigation Systems, Sewage Treatment Facilities, Steam and Air-Conditioning Supply, Iron and Steel Forging, Motor Vehicle Supplies and New Parts Merchant Wholesalers

Hydroelectric Power Generation, Fossil Fuel Electric Power Generation, Natural Gas Distribution, Water Supply and Irrigation Systems, Sewage Treatment Facilities

Hydroelectric Power Generation, Sewage Treatment Facilities, Industrial Building Construction, Commercial and Institutional Building Construction, Water and Sewer Line and Related Structures Construction

Water Supply and Irrigation Systems, Sewage Treatment Facilities, Industrial Building Construction, Water and Sewer Line and Related Structures Construction, Electrical Contractors

Boiler

Water Supply and Irrigation Systems, Sewage Treatment Facilities, Water and Sewer Line and Related Structures Construction, Land Subdivision, Highway, Street, and Bridge Construction

Natural Gas Distribution, Water Supply and Irrigation Systems, Sewage Treatment Facilities, Steam and Air-Conditioning Supply, Water and Sewer Line and Related Structures Construction

Sewage Treatment Facilities, Water and Sewer Line and Related Structures Construction, Highway, Street, and Bridge Construction, Site Preparation Contractors, All Other Specialty Trade Contractors