South Hartford Conveyance and Storage Tunnel

South Hartford Conveyance and Storage Tunnel

The SHCST is a four mile long deep rock tunnel designed to store excess combined wastewater and storm water during rain events, and then convey the flows to the Hartford Water Pollution Control Facility (HWPCF) for treatment.
Wet Weather Expansion

Wet Weather Expansion

MDC is expanding the capacity of the Hartford Water Pollution Control Facility to provide treatment of wet weather flows, up to 200 million gallons a day.
About the Project

About the Project

When stormwater overwhelms the MDC’s sewer system, it causes combined sewer overflows into local waterways and backups into neighborhoods and basements.

News & Events

YouTube video: Construction of the South Hartford Conveyance and Storage Tunnel

May 19, 2017 - Learn More >

Goff Brook Presentation

May 12, 2017 - Learn More >

MDC's Clean Water Project featured in North American Society for Trenchless Technology Journal

April 3, 2017 - Learn More >

Long Term Control Plan Update Presentation

January 9, 2017 - Learn More >

MDC South Hartford Conveyance and Storage Tunnel Groundbreaking Video

November 1, 2016 - Learn More >

MDC to Hold Groundbreaking Ceremony for South Hartford Tunnel

October 19, 2016 - Learn More >

MDC Holds Ribbon Cutting for Marcus Garvey Place

September 23, 2016 - Learn More >

Engineering News-Record Article: Connecticut Combined Sewer Overflow Tunnel Moves Forward

August 11, 2016 - Learn More >

Hartford Business Journal: MDC awards $279.4M tunnel project

July 1, 2016 - Learn More >

Press Release: MDC Awards Contract to Build South Hartford Tunnel

June 30, 2016 - Learn More >

Featured Videos

South Hartford Conveyance and Storage Tunnel Construction

South Hartford Conveyance and Storage Tunnel Groundbreaking

MDC Wastewater Treatment

MDC Wastewater Documentary

Complexity Under Control - The Clean Water Project - CDM SMith Project Stories

The Clean Water Project

The Metropolitan District (MDC) manages the Hartford region's drinking water and wastewater systems.  The Clean Water Project is a program that upgrades the MDC's wastewater infrastructure with more than $2 billion of improvements designed to protect the health and safety of citizens during storm events and formally addresses a federal consent decree and a Connecticut DEEP consent order to achieve Federal Clean Water Act goals.