CONTRACTORS have started work on a pipeline to supply drinking water to Minyip residents.
GWMWater revealed plans for pipelines to supply Minyip, Donald, Rupanyup, Jeparit and Wycheproof with filtered water in July.
Floods in 2011 contaminated the towns' water supplies.
The towns will be connected to neighbouring water treatment plants.
GWMWater customer relations manager Helen Friend said the
authority was preparing for air
scouring in each town and calling for quotes from contractors.
She said Mitchell Water had started work on pipeline works between Minyip and Murtoa and work had also started on a new pump station.
"There is a new tank at Murtoa which will supply both Minyip and Rupanyup and that is complete and ready for testing," she said.
Mrs Friend said a slab for a tank at Donald had been poured and tank construction was continuing.
"An existing chlorinator has been upgraded and is ready to go," she said.
"A chlorinator upgrade at Rupanyup is also complete."
Mrs Friend said works for Jeparit were also under way.
"Tanks have been completed at existing storages and will be tested soon," she said.
"Work has started on installing new pumps which will transfer water from Rainbow to Jeparit.
"There will be no direct impact on customers until towns are air scoured and drinking quality water starts being delivered into the towns.
"This remains on track to occur by June 30."
Some Horsham residents lost water pressure on Tuesday night because of a problem at the Mount Zero water plant.
Mrs Friend said there were some technical issues at the plant and as a result the authority switched supply to the Morson plant temporarily.