Well if you actually looked at the document, and then actually look at the CAS number of the chemical they’re reporting on, you’d find this:
Permethrin, with the Chemical Abstracts Service (CAS) registry number 52645-53-1, is typically sold with a purity of at least 95% or 96%. It’s a synthetic pyrethroid insecticide that’s also used as a pesticide and voltage-gated sodium channel modulator.
That information is for nearly 100% purity permethrin. Not <1%.
our misting system uses a pyrethrin base which is found in chrysanthemums, not permethrin which is a man made chemical
The EPA link above that recommends hazardous waste disposal makes no qualifiers on “it’s okay to pour anything less than -x- on the ground.”
Of course there are risks to the environment dumping it. You think those are negligible. Someone who doesn’t can dispose of it with their municipality as hazardous waste. I’m sorry that bothers you.
Kudos to you for wanting to dispose of it properly. Our county has free chemical/pesticide disposal at a couple of their facilities. Every couple of years I gather up my old fly spray/weed killer/etc. and take it in.
If your local county doesn’t have a hazardous waste/pesticide disposal resource, try your state’s environmental agency. Some companies like Waste Management will accept them (there might be a fee): https://www.wm.com/us/en/home/common-hazardous-waste
Note that permethrin/pyrethrum is highly toxic to cats, so if you have any outdoor cats make sure to wipe up/dry any spills. Not that cats are likely to walk through anything wet, but you never know with cats! 
I don’t like the assumption that I am some kind of environmental tyrant for suggesting that dumping this concentration of this chemical is a negligible risk.
Along with completely incorrect link to hazard statements with concentrations FAR beyond what we’re talking here.
If someone wants to bring it in to a haz facility fine, that’s great. But it’s a shame to waste their resources on 99% water.
I put it in a 5 gallon bucket and took it to my counties free hazardous household waste location that takes all sorts of things including pesticides
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