The Brazilian company seeks to improve sanitation in the industrial area of Foz do Iguaçu.
The Brazilian company will use the proceeds to repay existing debts, reinforce working capital, and finance future investments.
The concessionaire is concerned that the short distance between Tancredo Neves and Pampulha airports in Brazil's Minas Gerais state will lead to less demand, thus threatening investments.
With 80% of works completed, conclusion is expected for March 2018.
The two contracts are worth US$130mn, and works are expected to begin in February.
The measure is expected to attract foreign investors to future auctions.
The meeting takes place on November 9 in São Paulo and will evaluate the hiring of legal and financial advisers.
Brazilian state water agency will implement an online system to significantly shorten processing times.
Investments will materialize in 20 cities across Paraná state.