New documents released by an environmental advocacy group are showing that Seneca Lake has been polluted multiple times over the past decade.

They show a salt mine owned by Crestwood LP discharged pollutants into the lake without permission, as recently as February of this year.

The DEC fined the company $57,000 for the violations.

Pollutants include chloride, brine, and hydraulic oil.

"More than 100,000 people drink water from this incredibly important and historic lake," said Walter Hang, Toxics Targeting President. "So it's absolutely imperative that this lake be protected from the toxic discharges."

Crestwood LP did not immediately return a request for comment.