I also posted a question regarding the effects , if any, from the use of the cca treated timber used in my pier some 14 years ago. This was soon after the announcement that the industry would stop using the arsenic in treated timber. I got several good responses. The concensus was it shouldn't be a problem. Not sure there is any actual data available. I was advised by someone on this forum not to let the timber rot in the pond. I had the water tested and it was safe for drinking by the standards set for public water consumption. The pond bottom soil near the timber had arsenic content but I was told soil has a certain amount of arsenic anyway. I decided the pier was there and I wouldn't worry about it.
