TACOMA, Wash. -

 The owner of a Longview septic tank pumping business has been sentenced to more than two years in prison for dumping more than 2 million gallons of minimally treated waste into the public sewer system.

Federal, state and local law required Longview's All-Out Sewer and Drain Service to discharge the waste it collected into approved approved treatment facilities.

Instead, prosecutors said that for more than 10 years, owner Ray Caldwell and his company secretly pumped most of the waste into the sewer system, typically doing it before dawn when people wouldn't notice.

Seattle U.S. Attorney Jenny Durkan says the company stole hundreds of thousands of dollars worth of public services, and that Caldwell continued even after the U.S. Environmental Protection Agency raided the business in August 2012.

He was sentenced to 27 months in prison and a $250,000 fine for Clean Water Act violations, mail fraud and making false statements. The company shares in the fine.