Engineering studies were undertaken and in 1978 the United States Environmental Protection Agency (EPA) and the Pennsylvania Department of Environmental Resources (DER) were in agreement with the Borough's engineering firm. Construction was started on a completely new treatment facility with the capability of treating 4 million gallons per day, but at the time was only approved for treating an average 2-1/2 million gallons per day. Construction of new pumping stations at Pennbrook, Whites Road Park and an upgrading of the Ridge Street pumping station were included.
After a plant rerate study and Act 537 Plan Review, the plant was rerated by PADEP to 4.5 (MGD) million gallons per day in December 1996.
Lansdale's Treatment Plant is an advanced wastewater treatment facility. In addition to secondary treatment, it is designed to remove ammonia and nitrates in the nitrification and denitrification processes respectively. Phosphorus removal is provided by the PhoStrip System. The effluent from the treatment plant is discharged to the Neshaminy Creek.
The collection system includes approximately forty five miles of sanitary sewers, three major pumping stations, one pneumatic ejector station, and one submersible pumping station.
The Wastewater Treatment Plant is rated at a monthly average flow of 4.5 million gallons per day. The plant services Lansdale Borough and small portions of the bordering townships. Lansdale Borough has a population of approximately 16,500 residents.