Maine pesticides regulators are asking homeowners and farmers to sign up to have containers of old pesticides they may have around their properties collected.

The Pesticides Control Board said it will dispose of banned pesticides or pesticides that have become caked, frozen or otherwise rendered unusable, at no cost to homeowners.

Old chemicals like DDT, lead arsenate and chlordane are often discovered in barns, basements, sheds and garages. Collected chemicals go to out-of-state disposal facilities licensed by the federal government, where they are incinerated or reprocessed.

Preregistration is required by Sept. 30. To register and get details, go to the pesticide board website at www.thinkfirstspraylast.org or call the board at 287-2731.