South Carolina Electric & Gas is denying claims it illegally discharged arsenic and other contaminants into the Wateree River near Columbia.
And the utility wants a federal judge to dismiss a lawsuit filed in January by the Catawba Riverkeeper Foundation.
That lawsuit charges that SCE&G stores wet coal ash in earthen lagoons near its Eastover plant in lower Richland County and that monitoring wells near the lagoons show five times the legal limit of arsenic. The suit adds that sometimes the material leaks into the river.
In a response Thursday, SCE&G denies it is illegally discharging pollutants. The company also says the plaintiff and its members have not been harmed and lack standing to bring a lawsuit.
The foundation says its members fear using the river because of pollution.
Gov. Nikki Haley signed a bill this month banning citizen pollution suits. The Legislature last year allowed broad-based suits that give standing to all citizens, not just those who can show they have been harmed.