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Learn about:
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Sewer Division:
Private Inflow Source Removal Program
Program History
The Town of Greenwich is under orders from the U.S. Department of Justice, the U.S. Environmental
Protection Agency (USEPA), and the Connecticut Department of Environmental Protection (CTDEP) to
remove inflow sources from the Town's sanitary sewer collection system.
How is this being addressed? This program is ongoing, with the remainder of Greenwich
under investigation in our second investigation phase. The letters going out to residents
include those for:
- Confirmed illegal connection: where the physical connection of an illegal sources to the sanitary collection system was documented during an inspection. This letter mandates disconnection.
- Flexible connection: where the sump pump discharge is flexibly connected to its discharge point, even if the current discharge point is acceptable. This letter mandates installation of hard piping, to prevent future connection to an inappropriate location.
- Suspected connection: where preliminary investigation in the area strongly indicates an illegal connection. This letter mandates an inspection to perform testing which will either negate or confirm the connection.
- Request for inspection: where initial attempts to schedule an inspection were not successful, for whatever reason. This letter mandates that the property owner schedule an inspection.
What is inflow? Inflow is ground or storm water discharged by connection to the sanitary
sewer through basement sump pumps, floor drains, roof leaders, foundation and yard drains, and
catch basins. These types of connections to the sanitary sewer are illegal
as dictated by the Town Sewer Code. Inflow sources
contribute to high flows in the system, resulting in sanitary sewer overflows. Such overflows
can have a detrimental effect on the ecology of the Long Island Sound, reduce water quality for
recreation, and create unhealthy environmental conditions for Town residents.
How is it Found? To help identify inflow sources, the Town of Greenwich embarked on a major
investigation of its collection system. In the first phase, flow monitoring was conducted in
several neighborhoods including Belle Haven, Byram, Old Greenwich, and Riverside. As a result
of this monitoring, particular areas were targeted for more specific investigation in the form
of smoke testing and building inspections.
How much was found?: From these inflow investigations, we found a total of 181 sump pumps
and 30 drains directly connected to the sewer. Another ? sump pumps have the potential to be
connected to the sewer because of an unknown discharge location or flexible discharge pipe.
The confirmed illegal connections have the potential to discharge 1.55 million gallons of inflow
during a storm, approximately 15% of the Grass Island Wastewater Treatment Plant's average daily
flow. This is clearly a significant issue for our collection system and treatment plant facilities.
Program History · Types of Illegal Discharges ·
How to Comply · Program Contacts ·
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