The U.S. is teeming with unmarked, unregulated and abandoned oil and gas wells, which pose a potentially serious threat to communities that have grown up around the forgotten holes.
According to a report by ProPublica, some 12 million wells have been drilled in the past 150 years in the U.S., and a huge number of these were promptly forgotten about after they stopped producing, without being properly plugged. As a result, oil and gas can seep into surrounding areas, causing such hazards as groundwater contamination. Such incidents have been documented in Ohio, Kentucky, Michigan and several other states where drilling has been widespread over the years.
If the gas builds up enough, it also can lead to deadly explosions. A 2008 blast in Pennsylvania, one of the states with the longest history of oil and gas drilling, was sparked when someone lit a candle in a home bathroom, unaware that gas from an abandoned well nearby had leaked into the septic system. The resident was killed.
The exact number of unplugged wells in the U.S. is uncertain. But a 2008 survey from the Interstate Oil and Gas Compact Commission, which is composed of state regulators and industry officials from around the country, located 60,000 wells that need to be closed, and estimated that there may be up to a million more.
States facing grim budget outlooks have struggled to come up with the money to find and plug abandoned wells. Typically, the work costs tens of thousands of dollars, and, for more complicated wells, the tab can exceed $100,000.


