WASHINGTON — A common pesticide used on citrus fruits, almonds and other crops would be banned under a proposal announced Friday by the Environmental Protection Agency.

The proposal would prohibit use of chlorpyrifos, a widely used insecticide that is sprayed on a variety of crops including oranges, apples, cherries, grapes, broccoli and asparagus.

The pesticide, in use since 1965, has sickened dozens of farmworkers in recent years. Traces have been found in waterways, threatening fish, and regulators say overuse could make targeted insects immune to the pesticide.

U.S. farms use more than 6 million pounds of the chemical each year – about 25 percent of it in California.

The EPA said it will take public comments on the proposal for at least two months, with a final rule expected in December 2016. The rule would not take effect until 2017 at the earliest.

The EPA said in a written statement that its current analysis does not suggest risks from exposure to chlorpyrifos in food. But when those exposures are combined with estimated exposure from drinking water in certain watersheds, “EPA cannot conclude that the risk from aggregate exposure meets the Federal Food, Drug and Cosmetic Act safety standard,” the statement said.

The EPA banned home use of chlorpyrifos in 2000 and placed “no-spray” buffer zones around sensitive sites, such as schools, in 2012.

But environmental and public health groups say those proposals don’t go far enough.

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