Alcoa Intalco

We regulate the air, water, hazardous waste, and cleanup activities at the Alcoa Intalco aluminum smelter in Ferndale.


Air quality

We issued final air quality Agreed Order 18216 (response to comments) for the Intalco aluminum smelter on Jan. 22. 2021.

This facility temporarily closed (curtailed) in Aug. 2020. 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 approval by Ecology.

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.

Updated Apr. 26, 2021

Sulfur dioxide non-attainment

From 2017-2019, we worked with the Northwest Clean Air Agency to evaluate air quality data from Whatcom County. Data from monitors near Intalco showed sulfur dioxide levels that exceeded the National Ambient Air Quality Standard.

In Dec. 2020, the U.S. Environmental Protection Agency (EPA) made designated part of Whatcom County near the smelter to be in non-attainment for this standard. 

Join our sulfur dioxide attainment email list to learn more about our efforts to monitor and evaluate SO2 levels in Washington.

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, Intalco is capable of making approximately 307,000 tons of aluminum metal each year.
  • Wastewater is sent to the Strait of Georgia. Though the smelter is currently closed, Intalco continues to monitor pollutants in its treated sanitary wastewater and stormwater.

Permit information

Intalco Contacts

Company website
Facility phone: 360-384-6061
Location: 4050 Mountain View Road, Ferndale, Wash.