NAICS Codes

221310....... Water Supply and Irrigation Systems

221320....... Sewage Treatment Facilities

234910....... Water, Sewer, and Pipeline Construction

234990....... All Other Heavy Construction

235810....... Water Well Drilling Contractors

235930....... Excavation Contractors

236220....... Commercial and Institutional Building Construction

238910....... Site Preparation Contractors

238990....... Other Specialty Trade Contractors

541310....... Architectural Services

541330....... Engineering Services

541360....... Geophysical Surveying & Mapping Services

541370....... Surveying and Mapping Services

541380....... Testing Laboratories (except Medical and Veterinary)

541511....... Custom Computer Programming Services

541611....... Administrative Management and

                  General Management Consulting Services

541620....... Environmental Consulting Services

541690....... Other Scientific and Technical Consulting Services

561210....... Facilities Support Services

561990....... All Other Support Services

562112....... Hazardous Waste Collection

562119....... Other Waste Collection

562211....... Hazardous Waste Treatment and Disposal

562219....... Other Non-Hazardous Waste Treatment and Disposal

562910....... Remediation Services