Dollyroux, Thanks for your contribution.

I don't think acute arsenic or chromium poisoning is the worry with ACC treated timber. That is more the case if the sawdust is inhaled or the timber eaten (like when children chew play equipment). But the accumulation of these substances might be causing other health issues. This would be close to impossible to prove.

I have talked to a couple of doctors with an interest in these sorts of things. One of them is my father and he's a bit of a skeptic (as in he likes to research things and he's a bit of a science buff and can actually read studies and understand them). But both still strongly advised me against using CCA treated timber in my yard. Especially not for growing veggies in.

So while I don't agree with your DH's position on CCA being safe, I would be interested to hear his reasoning for not trusting ACQ.

To be honest, I don't trust either...