HARRISBURG, Pa. (AP) The Pennsylvania Supreme Court on Dec. 19 struck down portions of a law that stripped some of the powers municipalities have to decide where the booming natural gas industry can operate — portions that the industry had sought from Gov. Tom Corbett and lawmakers.

The justices ruled the 2012 law unconstitutionally restricted the power of municipalities, although the 4-to-2 majority disagreed as to why it was unconstitutional.

Seven municipalities challenged a law known as Act 13, which grew out of the state’s need to modernize 20-year-old drilling laws to account for a Marcellus Shale drilling boom made possible by innovations in drilling and technology.

The law restricted local municipalities’ ability to control where companies may place rigs, waste pits, pipelines and compressor and processing stations.

Among the objectionable provisions cited by the lawsuit are requirements that drilling, waste pits and pipelines be allowed in every zoning district, including residential districts, as long as certain buffers are observed.

“It’s a tremendous victory for local governments, for local democracy, for public health and for the environment,’’ said Jordan Yeager, one of the plaintiffs’ lawyers. “It’s a huge, huge victory for the people of Pennsylvania.’’

The municipalities said the zoning restrictions run counter to objectives of protecting the environment, health and safety of people who live there, and three of the six justices agreed. A fourth justice ruled that the law violated the municipalities’ constitutional rights to due process to carry out community planning.

Although the law passed last year, the new zoning rules had never gone into effect by court order. A narrowly divided lower court struck them down in 2012, but Corbett appealed, saying lawmakers have clear authority to override local zoning.

A lawyer of Senate President Pro Tempore Joe Scarnati, R-Jefferson, said the high court decision is a setback that will reopen the door to legal fights between municipalities and the drilling industry that the Legislature had sought to settle.

The drilling industry flocked to Pennsylvania in 2008 to tap into the Marcellus Shale natural gas formation and had sought the changes as a top priority, complaining of a complicated patchwork of municipal rules and some municipalities that had effectively tried to use zoning rules to ban drilling.

As part of a sprawling law that also toughened safety regulations over drilling and slapped a drilling fee on the industry, Corbett and Republican lawmakers approved the limitations over the objections of Democrats, who called them “corporate eminent domain.’’

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