Workers were potentially exposed to the hazards of drawning at the effluent tank and other tanks of wastewater treatment plant. There was opening of stairs to enter the effluent tank e.g. for maintenance purpose, and there was no limitation of access to prevent hazards and risks. There was no warning signage about the depth of the tank and its hazards to make people aware. Noted that the tanks have been provided with standard railings however still there were points as mentioned above that have not been included to control.