There’s next to none in all water, when measured by volume.

But things concentrate, so the 0.00005% adds up over time.

This is a “parts per million billion” sort of thing.

Think of it like PFAS or some other harmful chemical (which, you know, it basically is): the layperson would be categorically unable to get a meaningful measurement from a glass of water, but it can still fuck you (and everyone else) up real bad in the long run.

The micro plastic is in the dirt. Most commenters here think microplastic means a bit of plastic that broke off packaging.

Microplastic are plastic pieces that you need a strong microscope to see. They can be as small as bacteria.

https://www.sciencedirect.com/science/article/pii/S2215016121003095

Why don’t you tell me how you think you’re gonna clean literally microscopic plastic fragments out of said dirt?

I don’t think you understand how small the particles are. You can’t filter micro plastics out of soil because the micro plastics are the same size as the soil particles. Take a bucket of sand and dye half red. How are you going to filter it?

There are methods to destroy micro plastics like raising the temp. But that will kill the bacteria in the soil making it sterile.