North American Industry Classification Codes (NAICS)
221310 - Water Supply and Irrigation Systems
237110 - Water and Sewer Line and Related Structures
237210 - Land Subdivision
237310 - Highway, Street and Bridge Construction
237990 - Heavy Civil Engineering Construction
238910 - Site Preparation Construction
238990 - All other Specialty Trade Contractors
Standard Industrial Classifications
1611 - Highway and Street Construction
1623 - Water, Sewer Line aned Related Structures Construction
1629 - Heavy Construction, NEC
1771 - Concrete Work
1794 - Excavation Work
4941 - Water Supply
6552 - Subdividers and Developers, NEC