Since 1990, more than 5,600 incidents were reported involving land-based hazardous liquid pipelines, releasing a total of more than 110 million gallons of mostly crude and petroleum products, according to analysis of federal data. The pipeline safety agency considered more than half — at least 100 spills each year — to be “significant,” meaning they caused a fire, serious injury or fatality or released at least 2,100 gallons, among other factors.
Pipeline operators reported recovering less than half of all hazardous liquids spilled over the last two decades, according to federal records. And the ratio is not improving: after recovering more than 60 percent of liquids spilled in 2005 and 2006, operators recovered less than a third between 2007 and 2010.