St. George has agreed to pay a $75,000 fine for water pollution from its old sewage treatment plant, the U.S. Justice Department announced Tuesday.

It published a notice in the Federal Register that the fine is part of a proposed consent decree to settle a federal lawsuit. Public comment about the proposed decree will be taken for 30 days before it is made final.The Justice Department charged that St. George violated the Clean Water Act by discharging pollutants from its sewage treatment plant in excess of what was allowed, and by failing to comply with schedules for building a new, more efficient regional wastewater treatment plant.

The federal suit against St. George sought an injunction and civil penalties of up to $25,000 per day of violation. The suit also says the state of Utah is liable for any judgment against St. George to the extent that state laws prevented it from raising money needed to comply with environmental laws.

St. George has agreed to pay a $75,000 civil penalty for past violations, complete its new wastewater treatment plant by March 1, 1990, and have it operational no later than April 1, 1990, according to the Justice Department's notice.

Those wanting to comment on the proposed decree should write to the acting assistant attorney general, Land and Natural Resources Division, Department of Justice, Washington, D.C. 20530. Note should be made that it is in reference to United States vs. City of St. George and the state of Utah, case 88-C-910G.

Copies of the decree may be inspected in the office of the U.S. attorney for Utah, 350 S. Main, Salt Lake City.