Re: NANFA-- Above ground pond

Scott Davis (
Fri, 26 Mar 2004 09:26:25 -0600

A lot of these pressurized timbers are treated with either CCA (chromated
copper arsenate), followed by ACZA (ammoniacal copper zinc arsenate) and ACQ
(ammoniacal copper quat). All three preservatives are waterborne
preservatives. These timbers shed their contents very slowly and have been
applauded for limiting cutting of forest products since they last a lot
longer than untreated timbers. Some gardeners are cautious about using them
around food producing plants.

As of January 1, 2004, EPA will not allow CCA products to be used to treat
wood intended for any residential uses such as play-structures, decks,
picnic tables, landscaping timbers, residential fencing, patios and

Should we use them where they might bleed into a pond? I also wonder if we
should be tossing them into compost piles. :)

I'm probably at greater risk standing near bus exhaust. Is concern about
pressure treated timbers unnecessarilly alarmist when considering their
impact on ponds or streams?

Thanks and all the best!

> I have a friend who's grandfather built a swingset using pressure treated
> 2x4s. When he got a little old for the swingset, it was broken down and
> tossed behind the shed, where it eventually became buried in compost,
> leaves, etc. etc.
> My friend is now old enough to have grandkids of his own (he doesn't, but
> that's not the point. :) He recently decided that the 50 year old shed
> to go, to be replaced with a new one. When digging out the soil behind
> old shed... he found the pressure treated 2x4s, still in usable, good
> condition.
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