Den Dulk Poultry Farms, Ripon, Calif., is voluntarily recalling its organic brown eggs as a precaution because the eggs have the potential to be contaminated with salmonella, according to a Lake County News story.

The recalled eggs were distributed to Costco and Safeway in Northern California, as far south as Fresno and in western Nevada.

The eggs are sold at Costco as Kirkland Organic Brown Eggs and at 71 Safeway and Pack n' Save stores as O Organic Grade-A Large Brown Eggs.

The recall was initiated after it was determined that the eggs in question tested positive for salmonella during an internal investigation by den Dulk Poultry Farms.