Septic companies in Shelton, WA
Two septic companies on record in Shelton, Mason County. About 97% of mapped ground here is rated Very limited for septic drain fields, with filtering capacity the limiting feature.
Septic Permits in Mason County
Mason County Public Health, Environmental Health - On-Site Sewage System Program opens in a new tab
What the ground in Shelton is like
The USDA soil survey rates mapped ground in Shelton for septic drain-field suitability across roughly 6.5 square miles. About 97% of the rated ground is classed "Very limited", meaning the soil has one or more features unfavorable for a conventional drain field, and the limits generally cannot be overcome without major soil reclamation, special design or expensive installation.
In Shelton, the leading limit is filtering capacity: the soil does not clean effluent thoroughly enough on its way through. A drain field is a treatment system as well as a disposal path; when the ground cannot filter well, pathogens and nutrients travel farther than the survey allows. The survey flags that limit on about 69% of the rated ground here.
The limiting features the survey records most often here:
This is survey data for mapped areas, not a substitute for a site evaluation on your own lot. Conditions on a single parcel can differ from the map.
USDA NRCS SSURGO, ENG Septic Tank Absorption Fields · 96.5% Very limited · Filtering capacity · 20 map units · 6.47 sq mi · read 2026-08-30
The two companies
- 35B-Line Construction, Inc.Register not checked(360) 426-4221
- 30AAA Septic LLCRegister not checked(360) 427-6110