In order to maintain quality treated wastewater, ONAS conducts such actions as:

Controlling industrial effluent from network connected industrial facilities 
Controlling industrial wastewater and primary wastewater treatment plants based in industrial facilities, and this by conducting periodical laboratory analyses at ONAS laboratories (which comprise 6 fixed and 4 mobile laboratories)
Monitoring any violations related to disposals of pollutants in the network
Monitoring the works of construction of primary treatment plants
Assisting and coaching industrialists.