combined sewer overflow project

Courtesy of Narragansett Bay Commission

The board of the Narragansett Bay Commission has voted to move forward with the final phase of a water quality project designed to overhaul its old sewer systems. The wastewater agency is struggling with how much it will cost to complete the project, aimed at further improving water quality in Narragansett Bay.

The Narragansett Bay Commission’s third and final phase of a multi-year water quality project will cost about $815 million, if state and federal regulators approve the plan. This final phase could bring the project's total cost to about $1.5 billion.

The project, known as the combined sewer overflow (CSO) project, involves installing a large tunnel that would run through Pawtucket, Central Falls and the northern part of East Providence. The tunnel would stop untreated sewage and stormwater from overflowing into Narragansett Bay during heavy rainstorms.

The Narragansett Bay Commission has started to re-evaluate the third and final phase of the combined sewer overflow project. The project aims to reduce the amount of untreated sewage and polluted runoff overflows entering Narragansett Bay and its tributaries. Federal officials ordered the overhaul to meet the federal Clean Water Act.