Ban paraquat in residential areas.
Some almond growers use the most highly toxic herbicide called paraquat. For example, the almond orchard on Morehead in Chico uses paraquat, no warning signs, with houses with kids and animals across the street. The half-life of paraquat in the soil is up to 20 years.
Many food producers use non-toxic herbicides: "There are numerous design, management, mechanical, and cultivational practices, as well as some plant extracts, that can be used instead of paraquat, depending on the weed species and the situation."
http://wssroc.agron.ntu.edu.tw/note/Paraquat.pdf
