The Mamaroneck Sanitary Sewer District Wastewater Treatment Plant discharged 13.8 million gallons of partially treated sewage Sunday morning, nearly tripling the original estimate.
An updated NY Alert sent around 1 p.m. Monday said 13,862,820 gallons of disinfected, but only partially treated, discharge was pumped into Long Island Sound during a five-hour span Sunday. A previous NY Alert sent around 9:30 a.m. Sunday estimated 5 million gallons.
Rainfall accumulation surpassed 4 inches Sunday, the most precipitation the city has experienced in a summer of frequent rainstorms. An estimated 5 million gallons of partially treated sewage was also discharged on Aug. 20, and an estimated 4 million gallons came from the plant on Aug. 3.
The facility at 199 West Boston Post Road is undergoing construction, which is expected to continue for the next five years. Westchester County’s Department of Environmental Facilities (DEF) previously told The Record that when the plant flow exceeds 28 million gallons per day, portions of the flow bypass the facility’s secondary treatment process.
During this construction phase, the county agreed to issue a NY Alert and a report of noncompliance when wastewater receives only partial treatment.
