Connecticut Department of Energy & Environmental Protection

Summer 2021 Hypoxia Monitoring

Map of August 2021 water quality conditions in Long Island Sound.

Hypoxia Monitoring Overview

The 2021 sampling schedule includes routine water quality surveys as well as summer-only hypoxia surveys.

Routine water quality surveys are conducted year-round, including during the summer months.  During these surveys water samples are collected for from 17 stations and analyzed for nutrients and other water quality parameters.  In addition, phytoplankton and zooplankton samples are collected from 6 stations in the Sound.

Hypoxia surveys are conducted during the months of June through September at an additional 30 stations.  During hypoxia surveys, stations are sampled for dissolved oxygen to get a more accurate understanding of the extent of summer hypoxia conditions in Long Island Sound bottom waters.

DEEP's Long Island Sound Water Quality Monitoring Program utilizes data from both surveys to  monitor the extent of low dissolved oxygen in Long Island Sound bottom waters, or 'summertime hypoxia'.  Hypoxia condition maps are posted as soon as possible after each survey.   Biweekly newsletters, summarizing the results of each survey, are also distributed to interested parties.

2021 Monitoring Results

Select a sampling date below to view the progression of hypoxia in the western Sound throughout the summer of 2021.

June 2021:

July 2021:
August 2021:
September 2021:

LIS Hypoxia Monitoring Distribution List

Interested in receiving future biweekly survey summary newsletters?  Email Katie O'Brien-Clayton at Katie.Obrien-Clayton@ct.gov to be added to the distribution list.

    

LIS Monitoring Results and Annual Reports

 

   

Content last updated December 4, 2024