Yes, many of the veggies and fruit in the market are imported and have a high risk of chemicals.
SO DO meats and fish.
I worked as a consultant in farming here for 10 years and 6 years before that on a bi-monthly basis so I know what gets to eat what.
Example, you have a fish pond under a chicken or duck house, the animals are given feed with "additives" or pharmaceutical products for prevention or treatment because they become sick, the animals in the house poo and that goes through the slatted floor in to the fish pond. And so it goes !!!
If one is concerned about chemicals take time to look around the market or talk with people about where there is chemical free food.
If there is a Sante Asoke shop then go there.