Alcoa Wenatchee

We regulate the air, water, and hazardous waste activities at Alcoa's closed 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 order requires it to:

  • Prepare and submit a Four-Factor Analysis at least 180 days before restarting any potlines.
  • Install and put in place reasonable air pollution reduction measures identified in the analysis within 3 years of Ecology's approval.

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.

Learn more about the Regional Haze plan.

Updated Jan. 27, 2021

Facility information

Alcoa announced permanent closure of this facility in Dec. 2021. At full production, it was able to produce about 220,000 tons of aluminum each year. Recycling of aluminum did not take place at this location.

Wastewater is still sent (discharged) to the Columbia River. 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