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Division of Environmental Services
River Surveys

River Surveys

The Division of Environmental Services samples rivers in Greenwich periodically to monitor the water quality. The samples are tested in the Department of Health's Laboratory.

Byram River Sample Site Map (pdf)

Mianus River Sample Site Map (pdf)

CT DEEP Water Quality Classification Map for Greenwich

Water Quality Classifications Information (UCONN)

CT Water Quality Standards (Regulations of CT State Agencies)

Byram River - Class B surface water

March 2023	June 2023	October 2023
March 2022	June 2022	September 2022	December 2022

Mianus River Survey - Class A surface water

August 2023	September 2023	October 2023
February 2023	March 2023	May 2023	June 2023	July 2023

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Greenwich, CT 06830

Phone: 203-622-7700

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