How are pressure-treated woods toxic to my yard?

How are pressure-treated woods toxic to my yard?

Gary Ginsberg (Toxicologist) gives expert video advice on: What are the sources of toxins in my yard and garden?; How do persistent pesticides collect around my home?; How can my outdoor deck contain arsenic? and more...

Arsenical-based pesticide was always believed to stay in the wood. The reason it is called "pressure-treated" wood is because it was injected into the wood at the factory, under high pressure. The dogma was that it stayed in the wood, and it is true that most of it does stay in the wood. Otherwise, it wouldn't work to preserve the wood. However, enough leaches out during every rain event to create a hazard.