Mark R CollierLicensed

License details

"Based in" is the city and county of the address on the business's license record.

What this license covers

• Design: licensed to size and lay out a septic system for a specific site and soil condition.

How to verify this license

We publish the license details exactly as they appear in the public licensing records of the agency that issued the license; we do not vouch for the business itself. Before hiring, look up license #5100165 directly with the agency that issued it, confirm it is still active, and ask for a current certificate of insurance.

Source: Washington State Dept. of Health - Credential Search, last checked 2026-08-17. Look it up at the issuing agency.