Washington state utility regulators have levied their largest fine ever against Qwest Corp.

The $7.8 million fine was brought against the communications company for its failure to file contracts with rival carriers that use Qwest’s network. Qwest was also found to be in violation of state anti-discrimination laws by offering discounts and extra services to some companies and not others.

The company must pay the fine by Thursday, April 14. The money will not come from rates charged to customers. The $7.8 million represents just 0.04 percent of the company’s operating revenues in Washington state.

Qwest is also paying fines for similar violations in other states, according to Washington state Utilities and Transportation Commission spokesperson, Marilyn Meehan.

Qwest is the largest telephone provider in the state, serving 2.3 million customers.