Rice is easy to solve by just buying California grown. They have the lowest regional levels in the world and I expect the variance amongst those growers to not have significant impact.

How do you find California grown in other states? Often it just says US

Some brands tell you. I think Nishiki is one of the big ones. There are family farms that sell online too.

If you are concerned about heavy metals, look at herbs: https://www.consumerreports.org/health/food-safety/your-herb...

BTW I love Consumer Reports.

Are there any tests like this for rices imported from abroad?

IIRC, This was previously (recently) discussed wrt rice sold (or given) to Haiti. Because that rice came from the Confederate States, it has more arsenic.

IIRC2, don't buy rice from land formerly used to grow cotton. Because calcium arsenate was used to kill the boll weevil.

https://en.wikipedia.org/wiki/Boll_Weevil_Eradication_Progra...

Thanks! I would like to expand testing into other areas beyond plastic chemicals (like heavy metals) if and when the project grows.