Rochester, NY Deck Contractor  //  Pressure Treated Wood Deck
Jan. 1, 2004 The EPA  banned chromated copper arsenate (CCA) as a preservative for wood intended for residential use (except for the lumber that is used in permanent wood foundations). CCA-treated lumber will still be available for industrial and agricultural use. There's no need to panic about existing CCA-treated structures. The EPA says that they're fine. To reduce the chance of  leaching chromium and arsenic, you can paint it with an oil-based penetrating stain every couple of years.

click for additional photos: