SHANGHAI, China – China said on Wednesday that nearly a fifth of the food and consumer products that it checked in a nationwide survey this year were found to be substandard or tainted, underscoring the risk faced by its own consumers even as the country’s exports come under greater scrutiny overseas. Regulators said the broad survey of foods, agricultural tools, clothing, women and children’s products and other types of goods turned up sizable quality and safety failure rates for products that are sold domestically. The government said, for instance, that canned and preserved fruit and dried fish contained excessive bacteria; that 20 percent of the fruit and vegetable juice surveyed was deemed substandard, and that some children’s products were defective or laced with harmful chemicals. The announcement came amid a growing scandal over the quality and safety of Chinese-made exports and follows a series of international recalls involving everything from contaminated pet food ingredients and counterfeit toothpaste to toxic toys, defective tires and contaminated seafood. 160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! The General Administration of Quality Supervision, Inspection and Quarantine said the survey, conducted in the first half of this year, showed quality and safety improvements compared with conditions in the period a year earlier. But the announcement also suggested that Chinese consumers are at serious risk of being harmed by purchasing tainted foods, substandard goods and suspect or defective equipment. Regulators said, in effect, that goods sold in China are far more hazardous than the exports that are driving the country’s economic growth and now are partly the subject of safety and quality debates. Li Yuanping, a regulatory official, told the state-run Xinhua News Agency that “99 percent of the food exported to the United States was up to safety standards over the past two years, which is a high percentage.” But regulators in the United States, Europe and other countries are growing increasingly worried about safety failures involving Chinese-made goods.