It was formed in 1965 by an Act of Parliament to manage the Hollis, Caroni–Arena and Navet dams in Trinidad.
In Tobago, WASA maintains the Hillsborough Reservoir along with other freshwater wells to provide municipal drinking water for the country.
[1] This Act brought together several agencies that were formerly charged with the responsibility of providing water and sewerage facilities to the nation: The authority is the largest public utility in the country.
It serves over 92% of the population with pipeborne water through private house connections and standpipes.
With respect to wastewater, 30%–40% of the population is served by a central sewerage collection and treatment system.