GroundRosterEdward J FerroLicensed
| Name | Edward J Ferro |
| License number | 5100334 |
| License type | On-Site Wastewater Designer |
| License status | Active — Washington DOH credential |
| Based in | Arlington, Washington |
"Based in" is the city on the business's state license record. That can be a mailing address; it doesn't tell you where the business works.
Request a quote from Edward J Ferro
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 Washington's official licensing records; we do not vouch for the business itself. Before hiring, look up license #5100334 directly with the state, 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. Verify at the official source.
Are you Edward J Ferro? Claim this listing to show your business name on it. It's free, and we confirm every claim before anything changes.