The producer plant is still in situ and open to the public; however it suffered at least two explosions over the years, evidence of which is still clearly visible, and it is no longer operational.
The steam and gas engines were superseded by a set of electrically powered centrifugal pumps installed in 1926 and which ran until 1980.
A machine tool workshop has survived, complete with the belt-driven line shafting, as has the on-site blacksmith's forge, which is often fired up and demonstrated on open days.
(The site is still owned by Northumbrian Water, which continues to supply Darlington from its Broken Scar works, just across the A67 road from Tees Cottage).
Tees Cottage is one of 2 sites in Britain (the other being Kew Bridge) which shows all 3 forms of water pumping (steam, internal combustion, electric).