DEEP: Water Diversion Program

Water Diversion Program

New! CT DEEP is proposing a change to the Water Diversion Regulations in order to better protect critical water resources.

View the proposed Water Diversion Amendment and supporting documentation on the CT eRegulation website.    Hearing Report

Public Water Supply Management Area (PWSMA) maps showing Exclusive Service Areas (ESAs) referenced in the proposed regulation change under Section 22a-377(b)-1(b)(C):
Updated March 2017 - Fact sheet: 'Proposed Diversion Regulation Change Fact Sheet'.


What is a diversion?

Diversion means any activity which causes, allows or results in the withdrawal from or the alteration, modification or diminution of the instantaneous flow of the waters of the state.

The diversions that are the focus of the proposed regulation change are those that withdraw water from rivers, streams, or lakes (surface waters) or from the ground. Examples include:
  • wells withdrawing water from the ground to supply public drinking water,
  • pumping water from a pond for golf course irrigation, or
  • withdrawing water from a stream to cool industrial machinery.

{Irrigation Pump}
Irrigation Pump
{CT Stream}
Connecticut Stream
{Reservoir Intake}
 Reservoir Intake

The Water Diversion Program regulates activities that cause, allow or result in the withdrawal from, or the alteration, modification or diminution of, the instantaneous flow of the waters of the state through individual and general permits. The Water Diversion Policy Act is codified in Section 22a-365 through 22a-379 of the Connecticut General StatutesSections 22a-372-122a-377(b)-1  and 22a-377(c)-1 to 22a-377(c)-2  of the Regulations of Connecticut State Agencies clarify and expand upon certain provisions of the Statute.

In general, any person proposing a diversion which was not previously registered with the Department and, which is not exempt, must apply for a permit. You must apply for a permit if, among other things, you propose to

  • withdraw groundwater or surface water in excess of 50,000 gallons of per day;
  • collect and discharge runoff, including storm water drainage, from a watershed area greater than 100 acres;
  • relocate, retain, detain, bypass, channelize, pipe, culvert, ditch, drain, fill, excavate, dredge, dam, impound, dike, or enlarge waters of the state with a contributing watershed area greater than 100 acres;
  • transfer water from one water supply distribution system to another in excess of 50,000 gallons per day;
  • or modify a registered diversion.

Failure to obtain a permit for an unauthorized diversion may result in the initiation of enforcement actions with injunctions and penalties.


Permit Application Information


Related Guidance

For more information regarding the Water Diversion Policy Act, please contact the Water Planning and Management Division at (860) 424-3020.

Water Quantity

Content Last Updated April 2017