[ggm]

Economic use of post-treated sewage includes both greywater and sludge. Both are therefore presented to plants either in the root system or over green leaf material.

I would argue its tiny amounts, and far less likely to be concentrated the way mercury is in apex predator fish (tuna, swordfish) -But it would be wrong to assume veg-heavy diet automatically removes some risk of ingested plastics, if they are micro sized, soluable, and can be taken up in transpiration or by absorption due to contact.

I'm not wanting to oversell this: I think the plastics risk in food has been overstated for many people. Its a warning story about a risk side issue which has some extreme outliers. One survey I reviewed here after another HN story discussed Indian veg around a plastics factory which had a fire. I can assure you thats not normal agriculture practice, we don't routinely worldwide burn BPA containing plastic feedstock over our plants.