An Act relative to combined sewer overflows

HD 2758 requires Massachusetts municipalities and the Massachusetts Water Resources Authority to eliminate untreated sewage discharges during storms up to a 25-year frequency by January 1, 2035. It mandates that all combined sewer overflows must include at least solid removal and bacterial deactivation treatment. The Department of Environmental Protection must create regulations defining storm event sizes and treatment standards, updating them as climate science and technology evolve. This directly affects cities with combined sewer systems that currently discharge untreated sewage during heavy rain.