An environmental group blasted the new recommendations as toothless and said California should be taking the pesticide off the market after scientists for three state agencies found it was toxic and couldn't be safely used at any levels.
"Unfortunately, these are voluntary recommendations for local officials that have no weight of law behind them," said Paul Towers of the Pesticide Action Network. "Instead of taking this brain-harming pesticide off the market, California officials are again passing the buck."
The California action comes as the state considers long-term regulations to restrict the use of chlorpyrifos and designate it as a "toxic air contaminant" that poses a risk of serious illness or death.
Farmworkers in the nation's leading agricultural state have been sickened several times in recent years when the pesticide drifted.
More than three dozen workers harvesting cabbage in Kern County last year were affected when the pesticide drifted from neighboring farms, causing some to become nauseous and vomit and sending some for medical treatment, the department said.
At least 13 people were affected in four incidents this year, including 10 workers in Solano County where the pesticide was applied to an almond orchard in July.
The pesticide is in a class of organophosphates chemically similar to a nerve gas developed by Nazi Germany before World War II. Its heavy use has often left traces in drinking water sources. A University of California at Berkeley study in 2012 found that 87 percent of umbilical-cord blood samples tested from newborn babies contained detectable levels of the pesticide.
Under pressure from federal regulators, Dow voluntarily withdrew chlorpyrifos for use as a home insecticide in 2000. EPA also placed "no-spray" buffer zones around sensitive sites, such as schools, in 2012.
Dow did not immediately respond to a request for comment.
The action by California comes as the state proposes designating chlorpyrifos as a "toxic air contaminant" that poses a risk of serious illness or death.
In the meantime, the department is recommending county agriculture commissioners, who issue pesticide application permits, adopt the restrictions in January so they can protect health.
"This is like our short-term fix," said department spokeswoman Charlotte Fadipe. "We've already started down a longer road to a permanent fix."
Other recommendations include creating a 150-foot setback from homes, businesses and schools where the pesticide is applied. During applications, there would have to be a quarter-mile buffer zone for 24 hours around any field where the pesticide is applied and the only people allowed inside the area would be authorized applicators.