Not every lot in Huntsville qualifies for a standard septic system. Here’s when Alabama law requires an Engineered OSS:
| Trigger | Example in Huntsville Area |
|---|---|
| Lot < 15,000 sq ft | New subdivisions in Madison |
| Slope > 25% | Hills in Owens Cross Roads |
| Rock within 26″ | Limestone bedrock in Hampton Cove |
| High water table | Low-lying areas near Flint River |
| Flow > 1,800 GPD | Large homes or duplexes |
Conventional vs. Engineered
- Conventional ($–$$ ): Gravity-fed field lines in natural soil
- Engineered ( $$$+): Mound, drip irrigation, low-pressure pipe (LPP), or advanced treatment
Unsure if your lot needs an engineered system? Get a free site evaluation from Trey Mann, P.E. — call (256) 426-0235.