Perc Tests and Soil Evaluations in Alabama

Called here: Percolation Test or Soil Evaluation (PE, PG, PLS, PSC, or PBESS)

Every Alabama county's Local Health Department (LHD) is the permitting authority, although counties can adopt stricter rules. First, get the site evaluated by a qualified PSC, PE, PG, or PLS, or ask whether the county offers a PBESS morphology evaluation. Ask which authorized method fits the site and what records the LHD expects. Submit the evaluation, application, and county fee for a Permit to Install. Do not treat the application as permission to begin. No part of the installation may be covered or used until the LHD can inspect it and required corrections are made; work covered early must be uncovered at the LHD's direction. The installer coordinates inspection and confirms readiness by 9 a.m. on inspection day. The system cannot be used until the LHD issues Approval for Use. No statewide end-to-end turnaround was established, so ask the LHD about current timing.

Alabama has no blanket acreage exemption from individual onsite sewage permitting. Its three-acres-or-greater provision is a narrower exception to large-flow-development planning rules, not an exemption from a single-family home's Permit to Install. A home still needs that permit regardless of acreage, so verify any contrary claim with the county health department. Alabama recognizes percolation testing, unified soils classification, soil morphology, and detailed soil mapping as separate methods tied to different credentials and site conditions. A high-intensity map is the minimum intensity described in the researched rule text as able to substitute for percolation or morphology testing on an individual lot, but that detail predates the 2023 recodification. Confirm current mapping requirements with the evaluator and ask the LHD which method and records it expects.

Alabama-specific evaluator-price evidence is thin. Three operating soil classifier and land surveying firms were checked, and none published a price; available pricing was quote-only. Get quotes from two or three licensed professionals and ask what fieldwork, report, and delivery timing each quote includes. The county permit fee is separate. Mobile publishes a $200 residential permit fee plus a separate $30 initial intake fee. Jefferson publishes $1,023 for a new system, repair, or addition. Baldwin confirms that a fee applies but does not publish the amount. These limited examples show county variation, not a statewide range or average. Generic national perc-test estimates are not calibrated to Alabama's licensed-professional and county-fee structure, so call the property's LHD for its current charge.

Alabama defines its wet season as December 1 through April 30, generally the period with the highest rainfall and the most unfavorable conditions for septic-system operation because of soil characteristics such as shrink-swell potential and perched or apparent high water tables. The rule says the period can vary by location, so it is a general guide rather than a hard boundary. Separately, soils with high shrink-swell potential require at least 24 hours of constant saturation before a percolation test, compared with the standard minimum four-hour saturation for other soils. That is a soil-type trigger, not a calendar rule. No sourced statewide turnaround was found for evaluation, reporting, permit review, inspection, or the complete process. Ask the evaluator when fieldwork and the report can be completed, and ask the LHD about review and inspection timing.

Alabama ties each of four evaluation methods to specific credentials. A Professional Engineer (PE), Professional Geologist (PG), Professional Land Surveyor (PLS), or Professional Soil Classifier (PSC) may perform a percolation test. A PE or PG may perform the unified soils classification method. A PSC, or an eligible ADPH-employed Public Health Environmental Site Specialist (PBESS) in an approved county for a conventional small-flow system, may perform soil morphology. Only a PSC may perform detailed soil mapping. ADPH and county health departments administer septic permitting, while the Alabama Soil & Water Conservation Committee (ALSWCC) administers the PSC credential. Ask for the relevant license number or confirmation of PBESS employment, and check PSCs against ALSWCC's current roster or other professionals with their own state licensing board.

Alabama Department of Public Health (ADPH), Onsite Sewage Program · Verify a license