Alcoa Wenatchee

We regulate the air, water, and hazardous waste activities at Alcoa's Wenatchee aluminum smelter in Malaga.


Air quality

We issued final air quality Agreed Order 18100 (response to comments) for the Alcoa Wenatchee aluminum smelter on Jan. 22, 2021.

This facility temporarily closed (curtailed) in 2015. The proposed order requires it to:

  • Prepare and submit a Four-Factor Analysis.
  • Install and put in place reasonable air pollution reduction measures approved by Ecology before restarting its potlines.

A Four-Factor Analysis assesses and compares potential air pollution (emissions) control technologies for cost, time needed to install the control, energy and non-air quality impacts, and remaining useful life of equipment. The controls selected will reduce sulfur dioxide emissions and become part of Washington’s air quality plan to improve air quality by reducing regional haze — the human-caused particles in the air from activities such as industrial operations and burning of fuel — to improve visibility.

The air pollution reductions expected will be reported in the Regional Haze plan that will be available for public review and comment this year.

Updated Jan. 27, 2021

Facility information

This facility is temporarily shut down. When running, it turns alumina ore into aluminum metal. Recycling of aluminum does not take place at this location.

  • At full production, the facility is able to produce about 220,000 tons of aluminum each year.
  • Wastewater is sent to the Columbia River. Though the smelter is currently closed, Alcoa continues to monitor pollutants in their treated sanitary wastewater, non-contact cooling water, and stormwater.

Permit information

Alcoa Wenatchee contacts

Company website
Facility phone: 509-663-9246
Location: 6200 Malaga Highway, Malaga, Wash.