35
Management and operation of municipal waterworks and other water supply and distribution plants and municipal, government, commercial, and industrial wastewater treatment plants for others
37
Construction of municipal waterworks and other water supply and distribution plants and municipal, government, commercial, and industrial wastewater treatment plants for others; waste collection and disposal, cleaning of tanks for the storage of residuals, dewatering of residuals, and underwater dredging, all provided at municipal, governmental, commercial, and industrial facilities and residential developments; rehabilitation, repair, and cleaning of subsurface water and wastewater pipelines, manholes, and sewers
39
Utility services, namely, providing water and sewer services; providing information in the field of water supply and distribution
40
Water and wastewater treatment services, provided at municipal, governmental, commercial and industrial facilities; carbon treatment services, namely, regenerating spent carbon for use in water systems; water and wastewater treatment services provided to residential developments; providing information in the field of wastewater treatment
42
Design and engineering of municipal waterworks and other water supply and distribution plants and municipal, government, commercial, and industrial wastewater treatment plants for others; design, engineering, monitoring, and inspection of subsurface water and wastewater pipelines, manholes, and sewers for others
45
Consulting services related to the regulatory aspects of water supply and distribution and wastewater treatment