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

Design Develop Construct Journal article: Cleaning Up Connecticut

November 28, 2017 - Learn More >

WNPR story on the MDC's Tunnel Project

November 7, 2017 - Learn More >

Tunnel Business Magazine article on MDC Tunnel Projects

October 25, 2017 - Learn More >

YouTube Video: South Hartford Conveyance and Storage Tunnel Construction October 2017

October 18, 2017 - Learn More >

New England Real Estate Journal article: Tunneling to Success

August 21, 2017 - Learn More >

Construction Equipment Guide article: Complex South Hartford Conveyance and Storage Tunnel Under Way

August 4, 2017 - Learn More >

YouTube: South Hartford Tunnel construction animated clip

August 1, 2017 - Learn More >

Video of MDC's Susan Negrelli discussing Tunnel Project

July 18, 2017 - Learn More >

Hartford Courant: Work On Massive Hartford Sewage Tunnel Underway

July 10, 2017 - Learn More >

Hartford Courant: MDC Announces Name of Tunnel Boring Machine

June 19, 2017 - Learn More >

Featured Videos

South Hartford Conveyance and Storage Tunnel Construction October 2017

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.