But environmental groups and many government scientists say the chemicals have harmed wildlife and pose a threat to humans.

Polluted stormwater runoff can harm or kill fish and other wildlife.

A perimeter was established around the affected area, and none of the oil had harmed local wildlife.

"They also carry ticks which can harm other wildlife and birds."

Such substances can harm water quality and wildlife, as well as damage municipal sewage treatment plants.

Dan Markowski of the department's mosquito control group said the insecticide does not harm other wildlife.

However, some pesticides may cause cancer and other health problems, as well as harming wildlife.

Poor fishing practices can also harm other wildlife and even destroy entire habitats.

Environmentalists opposed construction on the 575-acre parcel, saying it would harm wildlife.

Government scientists contend that the chemicals have harmed wildlife along the Hudson and are a serious health risk to humans.