BEIJING—Regulators in northern China shut down production at a beverage plant owned by Coca-Cola Co. after finding chlorine in a batch of drinks made in February.

The food-safety regulator in Shanxi province said Saturday that during an April inspection it found that a batch of drinks produced by Coca-Cola (Shanxi) Beverage Ltd. was made with water containing chlorine. The statement, from the Shanxi Provincial Bureau of Quality and Technical Supervision, refers to the suspension as a penalty for the chlorine levels.

The statement didn't detail the findings and didn't say when the plant will resume production.

A Coca-Cola spokeswoman said the Atlanta-based company found only trace levels of chlorine in a batch made between Feb. 4 and Feb. 8. The levels were just below the national standard of purified water in China of 0.005 milligrams per liter, the spokeswoman said, adding that the chlorine level was below World Health Organization limits for drinking water.

The company said it is working to resolve quality and production issues at the plant, she said. "At no time did these issues affect the safety of our products in the market," she said. The plant's suspension won't affect the company's business in China, the spokeswoman said.