Rusting rivers and huge rainfall have complicated pollution control at Northwest Alaska’s massive zinc mine.

Elevated lead levels were found in drinking water fixtures at Mildred Hall School in Yellowknife, the fourth Yellowknife school to test positive this year. The N.W.T. government will fund alternate drinking water for any territorial school while testing and remediation continue.

The 81-foot tender F/V Pavlof sank Thursday morning while moored in Haines Harbor, prompting an oil-containment response and salvage efforts. Harbor staff, divers, and local vessels worked through low tide to free the vessel and limit contamination.

Gratangen municipality orders a farmer to stop an alleged illegal discharge of manure effluent. The farmer says the releases have ceased, but the municipality disagrees.

Two separate fuel spills occurred at the Kangaatsiaq power plant within a week, releasing an estimated total of up to 27,000 liters into the building, surrounding ground, and the sea. Authorities say the extent of the marine spill is unknown and could not be contained due to wind, waves, darkness, and lack of equipment.