Two new water treatment plants at Goldsborough, Tobago and Santa Cruz, will cost about $48.7 million and $80.7 million respectively.
The Water and Sewage Authority will commence work in June on the projects.
It will facilitate the treatment of an additional 6.5 million gallons a water a day.
2.0 million gallons per day at Goldsborough and 4.5 million at Santa Cruz.
The move is part of the National Water Sector Transformation Programme.
Both projects are scheduled to be completed within 18 months.
They are being funded under a loan agreement with the Inter- American Development Bank.
The utility explains when fully operational, the Goldsborough Treatment plant will benefit more than 17,000 residents across communities in Tobago while the new treatment plant in Santa Cruz will benefit more than 14,000 residents.