The discharge of drilling waste into streams that supply drinking water for millions of people has come under national scrutiny. (pennlive.com)
Other areas have suffered damage from poor land - use practices, such as creating pits to store oil drilling waste. (trustedchoice.com)
A short distance away from the murky pond, an oil services company had begun pumping millions of gallons of drilling waste into an injection well. (scientificamerican.com)