S. Steel agreed Monday to pay nearly $900,000 to settle a complaint filed after one of the company’s plants spilled toxic chromium into a Lake Michigan tributary last year.

The Pittsburgh-based company also will begin testing daily for the most toxic form of chromium in water near its Midwest Plant in northwest Indiana, embark on a preventive maintenance program and upgrade other types of pollution monitoring in response to legal action taken by the U.S. Environmental Protection Agency and the Indiana Department of Environmental Management.