Alcoa Intalco

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


Air quality: Sulfur dioxide

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.

The U.S. Environmental Protection Agency (EPA) held a comment period Aug. 21 - Sept. 21, 2020 on the proposal to designate part of Whatcom County near the smelter to be in non-attainment for this standard. 

The next step is for the EPA to review comments received and make a final decison on non-attainment.

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 started to curtail operations in May 2020 and has 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.