The lawsuit sought to force the builders of the Rover Pipeline to pay fines for what Ohio regulators said were numerous water pollution violations during the pipeline's construction.
A county judge in Canton ruled earlier this week that the Ohio Environmental Protection Agency had waived its right to regulate construction under the Clean Water Act.
Dallas-based Energy Transfer Partners argued it was up to the Federal Energy Regulatory Commission to enforce environmental laws during construction.
A spokesman for the Ohio attorney general's office tells The Repository in Canton the state is reviewing the decision and is considering its next step.
Information from: The Repository, http://www.cantonrep.com
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