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Fact Sheets

Frequency of Hypoxia

                          The map above illustrates the areas of the Long Island Sound that are most frequently affected by hypoxia.  The colors on the map represent the percentage of years in which hypoxic conditions have occurred in bottom waters of Long Island Sound since […] Continue Reading

Partners in Protecting the Sound

This fact sheet, available as a pdf download, describes highlights of LISS-funded projects and initiatives in 2009. Partners in Protecting the Sound 2009 Highlights Continue Reading

Water Conservation and Marine Water Quality

Clean water is a resource that is taken for granted. Pure water is necessary for growing food, manufacturing goods, disposing of wastes, and for our own consumption. Water conservation is most frequently thought of as a measure to protect against water shortages. While protecting water supplies is an excellent reason to practice conservation, there is […] Continue Reading

The Impact of Septic Systems on the Environment

Nearly half of the homes and businesses in the Long Island Sound watershed have septic tank waste disposal systems. When properly sited and maintained on a routine basis, septic systems are an excellent waste management alternative. However, when not properly sited or maintained, they can cause contamination of surface and groundwater resources, which leads to […] Continue Reading


Long Island Sound is as famous for its fish and shellfish as it is for boating, swimming, and scuba diving. The Sounds sheltered embayments are the most desirable areas for many recreational and commercial activities. Yet, it is on the shorelines of these embayments that developments are concentrated. Pathogen contamination, caused poor land use and […] Continue Reading

Nutrient Reduction: New Solutions to Old Problems

Over the past three years, the Long Island Sound Study (LISS) has been investigating the nature of the hypoxia (low dissolved oxygen) problem in Long Island Sound. There is a growing consensus among researchers that excess nutrients are the primary cause of the reduced oxygen levels observed in the Sound (see Fact Sheet #I). Measures […] Continue Reading

Toxic Contamination in Long Island Sound

Of the 55,000 chemicals in use today, many are poisonous or toxic. The effect of toxic contaminants on the health of Long Island Sound, and on those who use It. IS a major concern of the Long island Sound Study (LISS). What is Being Done About Toxic Contamination? LISS Investigators are evaluating information that identifies […] Continue Reading

Seafood Issues

Should I Continue to Eat Seafood? Yes! If you select a variety of products from reputable establishments or use recreationally harvested fish in ways consistent with the health advisories and handle them properly, you can feel confident that potential safety concerns associated with seafood are minimized. Consumers have been receiving mixed messages about the quality […] Continue Reading

Floatable Debris

In the summer of 1988, debris washing up on Northeastern shores marred the beauty of our beaches and raised the specter of threats to public health caused by pollution. In the wake of these washups, the public in the Long Island Sound area began asking questions: what is this debris, where does it come from, […] Continue Reading

Nonpoint Source Pollution in Long Island Sound

What is Nonpoint Source Pollution? Most people think of a rusty pipe spewing sewage when pollution is mentioned, but there are many unseen sources as well. For example, every time it rains or snows, pollutants are added to Long Island Sound. As the rain forms and falls, it picks up pollutants from the atmosphere during […] Continue Reading

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