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

Press Release:Green Infrastructure Improvement Project Completed at MDC Headquarters

June 28, 2019 - Learn More >

Press Release: MDC Receives National Recognition for Supplier Diversity Efforts on the Clean Water Project from U.S. EPA

May 13, 2019 - Learn More >

2018 Integrated Plan Long Term Control Plan Information

January 4, 2019 - Learn More >

Hartford Courant:Tunnel Ahead (article and video)

August 2, 2018 - Learn More >

Wethersfield LIFE article on Goff Brook Microtunnel Project

July 10, 2018 - Learn More >

YouTube Video: MDC South Hartford Conveyance and Storage Tunnel Blasting

June 27, 2018 - Learn More >

MDC's Clean Water Project featured on New England Public Radio

June 26, 2018 - Learn More >

NBC CT story on MDC's South Hartford Conveyance and Storage Tunnel

May 23, 2018 - Learn More >

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 >

Featured Videos

Ride on the "loki" Train 200 feet underground

Tunnel Boring Machine construction update August 2018

Time Lapse Construction Video of Tunnel

South Hartford Tunnel Pump Station Blasting

South Hartford Conveyance and Storage Tunnel Blasting

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.