Barton said the water treatment works, which was installed at the end of 2024, had led to improvements.
“What’s brought the figures down is the bad publicity that we kept giving them and they actually had to do something,” she said.
“It’s better but we’ve always got to be on our toes,” she said. “People power works.”
United Utilities said the mini wastewater treatment works had cut spills at the site and could treat double the amount of water each second compared to previously.
“The solution in place means we’re now able to biologically treat wastewater to the highest of standards in Cark before returning it safely to the environment,” a spokesperson said.