When Is a New Septic System Required?
New construction outside Mobile's sewer service area requires a permitted septic system before CO issuance. Existing systems with failed drainfields or structural tank failure often require full replacement. Mobile's coastal plain soils — ranging from sandy to clay-heavy — determine what system type is permittable on your specific lot.
System Types in Mobile County
Conventional gravity systems work well on sandy soils with adequate percolation. Low-pressure pipe (LPP) systems are used where soils are too tight for conventional systems. Aerobic treatment units handle the highest density and most challenging soil conditions. We conduct soil testing to determine what Alabama ADPH will approve for your site.
Alabama Septic Permit Process
Septic permits in Alabama are issued through the county health department. The process requires a site survey, soil percolation test, and engineered system design — typically 3–8 weeks depending on backlog. We coordinate the entire permitting process.
New System Cost in Mobile
Conventional systems run $8,000–$15,000. LPP and aerobic systems run $12,000–$22,000. Complex coastal sites, flood zone properties, or large commercial installations may exceed these ranges. Written estimates provided after site evaluation.