Goldenfields Water has proposed investigating options for "treating, removing and minimising discoloured water issues" in the Mt Arthur scheme that includes the townships of Coolamon, Ganmain and Matong.

The water authority's draft 2019/20 operational plan, released for public comment this month, forecast nearly $23.4 million in revenue.

Goldenfields anticipated about $6.3 million in residential charges from Bland, Coolamon, Junee, Temora, and parts of Cootamundra-Gundagai, Hilltops and Narrandera council areas.

Goldfields Water said its three per cent increase in fees across the board would equate "to an average residential account increase of only $6 per quarter".

The authority will develop a 30-year plan for the treatment works and major pump stations in the Jugiong scheme, which currently accounts for 42 per cent of Goldenfields' total water production.

The draft operational plan aimed for a renewal of high voltage works and further investigation into future assets required at the Oura treatment plant.

The authority will raise its residential and high-volume user service fees with the starting 20 millimetre connection lifting from $194 to $200.

Residential charges for each kilolitre used will increase by 2.94 per cent.

The draft also proposed the to start design work for 40 kilometres of pipeline renewal between Temora and Ariah Park.

Goldenfields Water has invited public submissions on it draft operational plan until June 7.