In July 2009, the city completed the first phase of a $185 million Combined Sewer Overflow Project, consisting of a  diameter deep rock tunnel designed to capture wet weather sewer overflows which previously entered the Quequechan River and Mount Hope Bay and divert these flows toward the city's sewer treatment plant instead.
In July 2009, the city finished the initial phase of a $185 million project designed to address combined sewer overflows by diverting wet weather overflows from the Quequechan River and Mount Hope Bay into the city's sewage treatment plant via a deep rock tunnel.