QCA chairman Professor Roy Green said bulk water charges accounted for about 30 per cent of an average household's water and sewerage bill.
Under the first proposed option,the current bulk water price for eight councils paying the common price - Brisbane,Gold Coast,Ipswich,Lockyer Valley,Logan,Moreton Bay,Scenic Rim and Somerset - of $2.82 per kilolitre,or 1000 litres,would rise by 5.2 per cent in 2018-19 and 2.5 per cent in each of the next two years.
That would mean the bulk water component of the bill of an average household,using 160 kilolitres per year,in those council areas would rise by $23.20 in 2018-19 and $12 in each of the next two years.
The price for Sunshine Coast and Noosa would increase by 8 per cent in 2018-19,7.4 per cent in 2019-20 and 2.5 per cent in 2020-21,while the price for Redland City would rise by 9.3 per cent,8.5 per cent and 2.5 per cent.
Under that option,the bulk water component of an average household's bill in the Sunshine Coast and Noosa would increase by $33.60 in 2018-19,$33.76 the following year and $12 in 2020-21.
In Redland City,the increases would be $38.08 for each of the first two years and $12 in 2020-21.
Under the second option,the common price applying to the group of eight councils would rise by 3.5 per cent in each of the three years,resulting in increases of $16 to $17 each year.