| Environment

PolyMet mine faces new obstacle after judge recommends rejecting its permit

Administrative Law Judge James E. LaFave wrote that PolyMet's plan to block tailings seepage with bentonite clay would not meet state rules for reactive mine waste.

Residents confront officials over health issues linked to Mpls. foundry

In a draft list of violations released in August, the EPA said Smith Foundry had been polluting its neighborhood's air and breaking air quality limits for five years.

Minneapolis cuts off 'dead leg' pipe that tainted one street's water with orange filth

The city fixed the problem after Jim Hagen's years of complaints. Now he wants others to get the same relief.

What is Minnesota's deepest lake?

Humans created many of the state's deepest water bodies.

MPCA: We have no evidence Smith Foundry polluted Minneapolis neighborhood

The Environmental Protection Agency made a surprise visit to the iron foundry in May, and said it found a raft of problems. But Minnesota regulators insist they don't have the data to show Smith released excess soot.

Lake that flows to Boundary Waters placed on state's list of polluted waters

Already impaired by taconite mine pollution, Birch Lake could face new threats from a proposed copper-nickel mine, environmentalists say.

Twin Metals gets go-ahead for drill plan in BWCA watershed

The mining company will be allowed to sink six holes to explore state minerals near Birch Lake in St. Louis County.

Pentagon investigating six sites in Minnesota for PFAS contamination of drinking water

At least two sites — Duluth airport and the National Guard's Camp Ripley — are already suspects for contamination.

With mine stalled, Twin Metals wants to drill exploratory holes in Boundary Waters watershed

Twin Metals asked to sink six new holes in northeastern Minnesota as it searches for copper, nickel and platinum group metals.

New research seeks solutions to clean drinking water without creating harmful chemicals

Scientists have known for years that treating water with chlorine or other chemicals can create toxic compounds; now, four teams will use EPA grants to find alternatives.