According to the 2021 end of year aquatic plant treatment survey of Lake Zoar, performed by North East Aquatic Research, the weed treatment was successful. Over 82 acres were treated, resulting in weeds being greatly reduced or completely gone after chemical application. No water chestnut was found despite its presence upstream in Lake Lillinonah.
Invasive aquatic plants in designated management areas in Lake Zoar were treated with the herbicide in August.
Eurasian milfoil was reduced in abundance or gone completely in 6 of the management areas, two had unchanged abundance, and the three areas where milfoil was not present had scattered new growth in September. Curly-leaf pondweed was the most abundant invasive species in May, occurring at 50-100% surface coverage in 8 of the 11 management areas. It was not found in any of the management areas in September.