By Andrew Grossman and Thomas Gryta 

Sprint Corp. overcharged the Federal Bureau of Investigation, the Drug Enforcement Administration and other law-enforcement agencies by more than 50% to facilitate eavesdropping on phone calls, the U.S. Justice Department alleged in a lawsuit filed Monday.

The suit accuses Sprint of inflating the bills it submitted to federal law-enforcement agencies for wiretaps and other surveillance services to cover capital expenditures necessary to respond to the requests--something prohibited by federal law and Federal Communications Commission rules, according to the complaint filed in federal court in San Francisco.

Sprint covered up the fact that the extra charges were included in the bills paid by the FBI and others by disguising them as regular surveillance costs, the suit alleges. As a result, the federal government overpaid Sprint by $21 million over a period of three and a half years.

Sprint said it didn't break the law and will fight the charges.

"Under the law, the government is required to reimburse Sprint for its reasonable costs incurred when assisting law enforcement agencies with electronic surveillance," Sprint spokesman John Taylor said. "The invoices Sprint has submitted to the government fully comply with the law. We have fully cooperated with this investigation and intend to defend this matter vigorously."

Telecommunications companies are allowed to charge law enforcement for wiretaps, but must go through a separate process to recoup some of the cost of setting up the systems needed to respond to government requests.

During the period when the Justice Department said Sprint was overbilling, the DEA racked up the largest surveillance bill: $21 million. The FBI came in second, paying $10.6 million.

The law was filed under the False Claims Act, which allows courts to award up to three times the amount overpaid by the government.

The bills covered wiretaps and the installation of so-called "pen registers," which record data about incoming and outgoing calls but not the content of the calls themselves.

In 2006, the FCC ruled that telecom carriers can't pass on the cost of complying with requirements to have their operations capable of government inception. Sprint revised its fees at that time, the government alleges, but didn't lower them enough.

In 2010, the company again revised its fees to remove the allegedly inappropriate extra costs, the government claims. Sprint's Mr. Taylor said the change in fees came after a "periodic routine review of rates."

The claims in the Justice Department's lawsuit echo those made by John Prather, a former New York City prosecutor, in a whistle-blower suit filed in 2009 against Sprint, AT&T Inc., Verizon Communications Inc. and other telecom companies.

Mr. Prather alleged the companies were "massively overcharging" local, state and federal law-enforcement agencies for wiretaps. The high charges were hard to detect, because the companies didn't itemize their bills, he said. Agencies went ahead and overpaid, because they were more concerned about investigations than their phone bills, Mr. Prather said in his lawsuit. Others found themselves strapped for cash and didn't do all the surveillance they needed, he said.

A federal judge threw out Mr. Prather's suit in November, saying he didn't have standing to sue. AT&T and Verizon declined to comment.

Write to Andrew Grossman at andrew.grossman@wsj.com and Thomas Gryta at thomas.gryta@wsj.com

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