Altaterra Consulting LLC.....

Erin Nelson, PE, LG, Founder & Owner 

We are based in Seattle, WA and provide services throughout western Washington and Oregon. Erin is also a licensed engineer in Alaska.

Entering our 9th year in business! Thank you to all of our valued clients and partners!

​​​Altaterra Consulting LLC is a specialty environmental consulting firm that partners with clients to effectively achieve their surface water management goals. We are experienced basin and surface water planning practitioners, with geologic and geomorphic expertise that is critical to characterizing and understanding watershed processes.

We assist clients with NPDES permit compliance and stormwater engineering support for municipal clients and have offered creative solutions to several happy clients.

Altaterra Consulting is a women-owned and operated business enterprise and is registered as a Washington State Office of Minority and Women's Business Enterprise (OMWBE).

  • Basin Planning
  • Stormwater Comprehensive Plans
  • Geomorphic Stream Surveys
  • NPDES Permit Compliance
  • Stormwater Facility Assessments
  • Stormwater Retrofit Planning
  • Stormwater Pollution Prevention Control Plans
  • Facility Stormwater Operation and Maintenance Plans
  • Conceptual Stormwater Facility Design