 They may perform water flow analysis, then select designs and equipment based on government and industry standards.Some are involved with a specific area of concern such as waste collection or the maintenance of waste water facilities and stormwater drainage systems within an area.Others cover a broader scope of activities that might include maintenance of the public water supply, collection of residential yard waste program, disposal of hazardous waste, recycling strategies and even community programs where individuals or businesses "adopt" an area and either maintain it themselves or donate funds for doing so.