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Toxic chemicals in compost?

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Toxic chemicals in compost?

Post  tomperrin on 2/5/2012, 11:32 am

This article is from

Whatcom County Extension Service:


"(considerations before choosing a compost method)

pesticides and herbicides

Is it safe to use compost from yard wastes that have come in contact with pesticides, or other toxic chemicals? The major route of breakdown of pesticides is through microbial degradation, which is the process of decomposition. Any pesticide a homeowner can buy without a license will be broken down in the compost pile before the end of the process. The one exception to this is clopyralid, which is contained in certain Dow products. Confront is the product that homeowners might use. This is a long lasting herbicide, and vegetation that has been treated with this should NOT be composted, since the resulting compost can cause serious injury to sensitive crops.

Some typical home yard chemicals, and their reaction to composting:

Slug bait: Most commercial slug baits contain metaldehyde which, when exposed to water, quickly breaks down to a harmless alcohol. (Fresh metaldehyde is toxic to slugs, snails, birds, cats, dogs, raccoons, rabbits, and humans).

Herbicides: Some herbicides become harmless in a very short time in the soil and compost piles (such as Diquat, Paraquat). Others (such as 2,4-D and propanil) break down in compost piles, but only after thorough composting. Still others (such as arsenic, borate, picloram, simazine, sodium chlorate) are extremely long-lived and will probably survive most composting processes. Do not use organic matter in your compost pile if it was treated with long-lived herbicides, such as CONFRONT.

Insecticides: All contemporary insecticides will break down during the decomposition process. Old chlorinated hydrocarbon insecticides such as DDT (which has been banned for a long time) may survive.

Fungicides: Vegetation that has been just sprayed with a fungicide may suppress the development of decomposing fungi if it is added to the compost pile. A few weeks will degrade the fungicide enough so that it will not effect the decomposition process. Currently, one turf fungicide, PMA, contains mercury and may only be used by commercial pesticide operators. This should not be used.

Do not use pressure treated wood to construct compost bins. It is now well demonstrated that chemical components of the pesticide do leach from treated lumber. The compost may retain a good share of those chemicals, and some would be carried with water into the soil or drains below. This could affect the compost’s quality, as well as safety and performance."


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Re: Toxic chemicals in compost?

Post  Lavender Debs on 2/5/2012, 11:55 am

Thank you! I've had this problem with bagged compost myself. Dead zone gardens are not fun...grow your own!

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What's not mentioned.....

Post  tomperrin on 2/5/2012, 12:07 pm

What's not mentioned in the article above is the presence or absence of hormones in composted cow manure. Horse manure should be free of all additives, especially if from a racing stable I would think. Bottom line and personal opinion, we should make our own compost whenever we can. It does take time tho.

Last edited by tomperrin on 2/5/2012, 12:08 pm; edited 1 time in total (Reason for editing : clarified first sentence)


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Re: Toxic chemicals in compost?

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