About a third of the current project portfolio is focused on transport, with potable water and sewerage accounting for another 20%.
The Criciúma municipality may suspend its sanitation contract with the Santa Catarina state utility due to a tariff-related dispute.
The company will invest around US$40mn to extend the dock in Brazil and South America's busiest port.
The studies put the investment required at US$128mn, local paper El Periódico reported.
Potential buyers must express interest by April 19.
The São Paulo state water utility will use the upcoming bond proceeds to pay existing debts that are coming due this year and also to reinforce its cash position.