The lawsuit was filed by 295 people and asks for about $75 million to cover lost crops and other damages.
Gold King Mine
The EPA said this week it is making progress on reviewing about 380 claims for lost income, fallen property values and other losses.
The 2015 spill sent a yellow-orange plume of toxic heavy metals into rivers in Colorado, New Mexico, Utah and on Native American lands.
The driver was not seriously injured, but about 9 cubic yards of sludge spilled into the water, officials said.
The EPA chose 26 mining sites for interim work to reduce human and environmental risks while a long-term solution is studied.
Pruitt has been under close scrutiny for his spending and relationships with industry representatives.
Jonathan Thompson places the Gold King Mine spill within the long history of mining and pollution in Southwest Colorado.
A mining company accused the agency of letting untreated mine wastewater get into the Animas River.
The allegation was made by Sunnyside Gold Corp., which is fighting the EPA over who should pay for a potentially costly groundwater study.