Frequently asked questions: On-site wastewater treatment

What type of experience do I need to become a license on-site wastewater treatment system designer?

You must have at least 4 years of experience showing increased responsibility for the design of on-site wastewater treatment systems, including:

• Site soil assessment
• Hydraulics
• Topographic delineations
• Use of specialized treatment processes and devices
• Microbiology
• Construction practices

Can I design systems anywhere in Washington when I get my license?

Yes. However, if you perform services in an area where you are not familiar with local codes, regulations, and guidelines, please contact the authorities in that jurisdiction for information about requirements and practices.

Why do I have to submit my application 3 months before the exam?

The time is needed to process applications, correspond with applicants, set up exam facilities, and print examinations.