10/19/2026
Tommy’s Pond has been one of Metuchen’s most recognizable and valued public spaces for generations, which is why the Borough took action last week to address an unusual problem there.
Residents are used to seeing some plant growth on the surface of Tommy’s Pond from time to time, including duckweed. What we saw this summer was different. An invasive aquatic plant known as common salvinia spread rapidly across the pond, forming dense mats on the water’s surface.
Left unchecked, common salvinia can block sunlight, reduce oxygen levels, harm fish and native vegetation, worsen water quality and create additional mosquito habitat.
Last week, the Borough completed a skimming project to remove as much of the salvinia as possible before winter. Doing so also reduces the amount of plant material that will decompose in the pond, which can contribute to low oxygen levels, fish kills and unpleasant odors.
This is an unusual case. According to the New Jersey Department of Environmental Protection, Tommy’s Pond was one of the first reported locations in New Jersey. As part of the Borough’s ongoing maintenance of the pond, we’ll continue to monitor conditions over the coming months. We are not exactly certain how the salvinia was introduced, but invasive aquatic species can spread in a number of ways.
Tommy’s Pond has been part of this community for well over a century, and the surrounding park was formally donated to the Borough by the Thomas family in 1929. Caring for it means understanding its natural cycles while also addressing threats like invasive species when necessary so this special part of Metuchen can be enjoyed for generations to come.