# Superior Underground LLC

Superior Underground LLC is a septic service company with an address in Portland, OR, United States.

Superior Underground LLC appears on the Oregon Department of Environmental Quality register (Onsite installer certification (associated practitioner)), with an address in Portland, OR. Services named in the source: septic installation.

## Details

- Address: 6400 SE 101st Ave Ste 3, Portland, OR, 97294, United States
- Phone: [15037500020](<tel:15037500020>)
- Website: [www.superiorunderground.net/](<https://www.superiorunderground.net/>)
- Issuing agency: Oregon Department of Environmental Quality
- Source: Oregon Department of Environmental Quality, https://www.oregon.gov/deq/Residential/Documents/Onsite-INSTALLERs.xlsx, fetched 2026-11-10. Website, street address, map pin from Overture Maps Places (CDLA-Permissive-2.0, release 2026-10-21.0).

## Questions

### Where is Superior Underground LLC?

Superior Underground LLC is at 6400 SE 101st Ave Ste 3, Portland, OR, 97294, United States.

### How do I contact Superior Underground LLC?

To contact Superior Underground LLC, call 15037500020 or visit https://www.superiorunderground.net/.

## Source

From [Public licence registers and member directories](https://www.oregon.gov/deq/Residential/Documents/Onsite-INSTALLERs.xlsx), license Public registers and member directories; no reuse licence stated. Association copyright applies., checked 2026-11-10.

Last updated November 10, 2026.

## Links

- This septic service company on the [web page](<https://septics.fyi/us/or/portland/superior-underground-llc>)
- [Septic installation in Portland](<https://septics.fyi/us/or/portland/category/septic-installation.md>)
- [More septic service companies in Portland](<https://septics.fyi/us/or/portland.md>)