IC 037. US 100 103 106. G & S: Construction of buildings; building construction supervision; construction consultancy services; construction of water treatment facilities; repair and maintenance of water treatment facilities and water treatment apparatus; repair and maintenance of waterworks facilities and sewage facilities; repair and maintenance of wastewater treatment apparatus; repair and maintenance of sludge disposal facilities and sludge disposal equipment; repair and maintenance of waste disposal facilities and waste disposal machines
IC 040. US 100 103 106. G & S: Water treating; water treatment and purification; destruction of waste and trash; waste management
IC 042. US 100 101. G & S: construction drafting; architectural consultation; engineering; design and engineering of water treatment facilities; design and engineering of waterworks facilities and sewage plants; design and engineering of sludge disposal facilities; design and engineering of waste disposal facilities; designing of water treatment apparatus; designing of wastewater treatment apparatus; designing of sludge disposal equipment; designing of waste disposal machines; designing of machines, apparatus, instruments and parts thereof, or system composed of such machines, apparatus and instruments; environmental assessment services
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