The Peconic River located in the eastern end of Long Island plays a big role in the lives of many different species as it is full of different habitats that provide a stable ecosystem. However humans have caused harm to the Peconic River. One of the human consequences to the Peconic is the nitrogen pollution. It contributes to algae blooms, hypoxia, and fish kills. There are also many sources of water pollution like water waste, pesticides, stormwater runoff, and domestic animal waste. Secondly, the rising population of humans living around the Peconic River has caused degraded water quality, habitat loss and fragmentation. A wide variety of invertebrates were carefully removed and observed from the Peconic River. The pictures of the species were taken in October of 2019 and were then preserved in ethanol for future use. These invertebrates may be indicators of water quality and will provide a better understanding of the biodiversity of the Peconic River. Comparing data from the last f