SECTION 1. As used in this Act, the following terms shall have the following meanings:

"Combined Sewer System" is a wastewater collection system of a municipality or of a Publicly Owned Treatment Works that conveys sanitary wastewater (domestic, commercial, and industrial wastewaters) and stormwater through a single-pipe system to a treatment plant.

“Combined Sewer Overflow” is a discharge or release from a Combined Sewer System directly or indirectly to a water of the commonwealth at a point prior to a Publicly Owned Treatment Works Treatment Plant.

"EEA" is the Executive Office of Energy and Environmental Affairs.

SECTION 2. Any entity, public or private that owns or operates a combined sewer system that discharges combined sewage into a Massachusetts waterway shall eliminate all combined sewer overflows into Massachusetts waterways by December 31, 2050.

SECTION 3. The EEA shall, within six months of the effective date of this Act, establish interim metrics and benchmarks to monitor progress toward the elimination of combined sewer overflows. These metrics shall include, but not be limited to:

(a)  Interim reduction targets for combined sewer system discharges discharges;

(b) Reporting requirements for entities owning or operating combined sewer systems.

SECTION 4. The EEA shall report annually to the General Court and the public on progress toward eliminating combined sewer overflows, including compliance with interim metrics and any barriers to implementation.