Answer 6 questions about your site and situation. The tool uses the same decision framework used by engineers and county health departments to determine whether an ATU is required — or whether a conventional system will work.
Decision logic based on: Florida DEP requirements for ATU use cases (county ordinance, drainfield reduction in limited soils, drip irrigation, proximity to water); LSU AgCenter ATU guidance; Santa Cruz County enhanced treatment regulations; NSF/ANSI Standard 40 Class I performance criteria. Local rules govern all system selection decisions — verify with your county health department before committing to any system type.