Alternative & Engineered Septic Systems for Difficult Lots

An alternative system is typically required when your percolation test shows poor soil absorption, your lot has a high water table, steep slopes, shallow bedrock, or insufficient space for a conventional drainfield. Arizona counties will specify whether an alternative (Type 4.03+) system is needed based on your site and soil evaluation results.

Alternative systems generally cost more than conventional systems due to advanced treatment components, engineering requirements, and ongoing maintenance contracts. The exact cost depends on the technology selected (ATU, drip, sand filter, etc.) and site conditions. We always design the simplest system your soil allows to minimize your investment.

Arizona law requires an annual maintenance contract for alternative septic systems. This typically includes inspection of mechanical components, monitoring of effluent quality, and verifying proper operation. Maintenance requirements vary by technology — aerobic units need more attention than passive systems like Eljen sand filters.

The right system depends entirely on your soil test results and lot conditions. If your perc test shows adequate absorption rates and you have sufficient space, a conventional system will be the most cost-effective choice. If soil, slope, space, or groundwater conditions prevent a conventional layout, an alternative system provides a path to permitting. We evaluate every project and recommend the simplest, most affordable option that meets code.