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Inland Wetlands & Watercourses

Director: Patricia M. P. Sesto
Telephone: (203) 622-7736
Fax: (203) 622-7764
Location: Town Hall, Second Floor
Office Hours: Mon.-Fri. 8:00 a.m.-3:30 p.m.
Counter Hours: Professional staff is available to answer questions Mon.-Fri. 8:00 a.m.-1:00 p.m. Appointments can be made at other times with individual professionals.

Amended IWWA Regulations for 2015
IWWA Regulations amended October 26, 2015. Here are the amended regulations
Greenwich Inland Wetlands and Watercourses Agency Appoints New Director
Greenwich, CT - Tuesday, April 28, 2015 – Last night, the Greenwich Inlands Wetlands and Watercourses Agency voted unanimously to appoint Patricia Sesto as their new Agency Director, effective June 1, 2015. Ms. Sesto was selected after a thorough search process that included several highly qualified candidates. ... Read more
RBV: The Treasure Hunt for CT's Healthiest Streams!
RBV: The Treasure Hunt for CT's Healthiest Streams!
The Connecticut Department of Energy and Environmental Protection River Bioassessment by Volunteers Program is an annual assessment of the water quality of local streams performed by volunteers. This years results from samples collected by IWWA staff from a segment of the East Branch Byram River found the water quality to be among the healthiest. Read the...
Basic Intro to The Greenwich Inland Wetlands and Watercourses Agency
This presentation offers a basic introduction to the Greenwich Inland Wetlands and Watercourses Agency. Wetlands Agency staff would be happy to meet with your local organization or school group to give this presentation and discuss the operations of the Agency in more detail.
A Look at the Policies and Science of Managing Aquatic Invasives
A Look at the Policies and Science of Managing Aquatic Invasives
Click on the flyer and links to view the power point presentations from our February 4, 2015 workshop as well as the 2008 memo from CT DEEP regarding pesticide permitting. ... Read more
IWWA Intern Studies Invasive Species in Town
Lindsay Tomaszewski, intern with the Greenwich Inland Wetlands & Watercourses Agency, has been labeling and studying the invasive species in the town-owned plot of land in the midcountry. Read the full article here.
Restoration of a Suburban Wetland
Restoration of a Suburban Wetland
Read this presentation about the management of aggressive invasive plant species.
The IWWA Names a New Chairman
Greenwich, CT, July 29, 2014 – The Inland Wetlands & Watercourses Agency, Town of Greenwich, is pleased to announce that Brian Harris has been named as its new Agency Chairman. Mr. Harris has served as a committed member of the Agency since June 2009, when he joined as an Alternate member of the Board. Read more.
Greenwich Watershed Presentation
Common aquatic nuisance species and chemicals applied to deter pond algal blooms and potential impacts on aquatic systems. Read more
IWWA Applications Become Available Online
Greenwich, CT, July 31, 2013 – The Inland Wetlands & Watercourses Agency, Town of Greenwich, is pleased to announce that it has launched a new web portal, available to the general public and accessible through the Town of Greenwich website: http://documents.greenwichct.org/publicaccess/ ... Read more
Annual Report for Fiscal Year 2013
Read more.
Do We Owe You a Refund?
The Inland Wetlands & Watercourses Agency is currently looking to return refundable deposits
... Read more
Native Landscapes Seminar
Native Landscapes Seminar
Wednesday, October 17, 2012: 6pm-8:30pm. Free! Read more.
IWWA Greensheet Review Fees
The Inland Wetlands & Watercourses Agency will begin assessing a fee of $30.00 for Greensheets reviewed in the office and $65.00 for Greensheets requiring a visit to the field or further analysis in the office effective 5/1/2012.
The Water Connection
March 29, 2012 Meeting Presentations
Expanded Public Counter Hours
Public counter hours (9:00 a.m.-1:00 p.m.) have been expanded from Monday through Friday.
Permit Transfer Letter/Assignment of Permit
Upon the sale of your property, complete this form to request a transfer of your existing Wetlands permit to a new owner. ... Read more
The inland wetlands and watercourses of the State of Connecticut are an indispensable, irreplaceable, and fragile natural resource with which the citizens of the State have been endowed.

The wetlands and watercourses are an interrelated web of nature essential to:

  • An adequate supply of surface and underground water
  • Hydrological stability and control of flooding and erosion
  • Recharging and purification of groundwater
  • The existence of many forms of animal, aquatic and plant life

The preservation and protection of the wetlands and watercourses from random, unnecessary and unregulated uses, disturbance or destruction is in the public interest and is essential to the health, welfare and safety of the citizens of the state.

It is, therefore, the purpose of the Greenwich Inland Wetlands and Watercourses Agency to protect the citizens of the State of Connecticut and Town of Greenwich by making provision for the protection, preservation, maintenance and use of the inland wetlands and watercourses.

Forms Required for Review
If there are wetlands/watercourse areas or drainage systems on a property, all proposed activities must be reviewed by the Inland Wetlands Agency staff. See forms below for more information.


Department Information
· General Information
· Forms and Other Information
· IWWA Public Web Portal
· Town Hall Only: IWWA Public Web Portal
· IWWA Application # Index by Street
· Public Web Portal Tip Sheet                   
· Frequently Asked Questions
Agency Information
· Agency Members and Staff
· Meeting Schedule & Agendas
· Meeting Archive
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Town Hall - 101 Field Point Road, Greenwich, CT 06830. Phone: (203) 622-7700. Copyright © , Town of Greenwich. All rights reserved.