Bulahdelah water supply

Crawford River weir


Bulahdelah's water supply system was originally developed in the 1950s. The current water treatment plant was built in 1988 and upgraded in 1995.

MidCoast Water Services provides water to approximately 560 homes and businesses in Bulahdelah.

Water is pumped directly to a treatment plant from a weir on the Crawford River, just near the old Pacific Highway bridge at Bulahdelah. The plant is able to treat two million litres of water each day. Prior to entering the water treatment plant, chemicals are added to the raw water. The coagulant ACH (aluminium chlorohydrate) is added to assist particles to bind together and settle. Sodium hypochlorite (liquid chlorine) is added to assist the removal of soluble metals which can be removed in the filters further down the process. Sodium carbonate (soda ash) can be added to adjust pH and assist in water stabilisation. There is provision for activated carbon to be added to remove taste and odour issues, however this is rarely needed.

Water passes through a clarifier where the processes of coagulation and flocculation take place. Clear water is drawn from the top of the clarifier and particles sink to the bottom and are removed.

Clear water then travels through sand filters where smaller particles are removed. Chlorine is added for disinfection and fluoride is added for dental hygiene before the clean water is pumped to the reservoirs and reticulation system.

More information is available on the chemicals used in the Bulahdelah water treatment process