When a Standard Septic System Will Not Work

You had your property evaluated and got news you were not expecting: a conventional septic system will not work on your lot. Maybe the soil failed a perc test, maybe the ground is too rocky, the slope too steep, or the water table too high. It is a frustrating place to be, especially in the middle of a building project, but it is not a dead end. It usually just means your property needs a different kind of system.

An alternative septic system is engineered to do what a standard system cannot: safely treat and disperse wastewater on sites where ordinary soil absorption is not enough on its own. These systems use added treatment or specialized distribution to handle conditions that would defeat a conventional setup. Advanced Septic Service designs and installs alternative systems across the Verde Valley and both sides of Mingus Mountain, on exactly the kinds of difficult lots this region is full of.

If your property can support a standard system, you may not need an alternative one at all, and a conventional septic installation is usually the simpler and less expensive route. But when the land rules that out, an alternative system is what makes the property buildable. The first step either way is finding out what your site can actually support.

How Alternative Systems Work

A conventional septic system relies on the soil to do most of the final treatment. Liquid leaves the tank and filters down through the drain field, where the soil naturally cleans it. That works well when the soil drains at the right rate and there is enough suitable ground to work with. An alternative system steps in when the soil or the site cannot carry that load on its own.

Alternative systems make up the difference in one of two ways. Some add a treatment step, cleaning the wastewater more thoroughly before it ever reaches the soil, so the ground has far less work to do. Others change how and where the liquid is distributed, spreading it in a way the site can handle even when a standard drain field cannot. Many systems combine both approaches. The result is a system matched to the property’s real conditions rather than one that assumes ideal ground.

Because these systems are engineered for specific conditions, the design step matters even more than it does with a conventional system. The right alternative system for a steep, rocky lot is not the same as the right one for a parcel with a high water table, which is why the process starts with understanding your site in detail.

Types of Alternative Septic Systems

There is no single alternative system. The right one depends on your soil, your site, and what your property needs. These are the most common types we design and install.

Aerobic Treatment Units (ATUs)

An aerobic treatment unit introduces oxygen into the treatment process, supporting bacteria that break down waste much more thoroughly than a standard tank. The result is cleaner effluent that the soil can handle even when conditions are poor. ATUs are a strong option for difficult sites, though they include mechanical components that require regular maintenance to keep running properly.

Mound Systems

A mound system raises the drain field above the natural ground in an engineered bed of sand and soil. This is a solution for sites where the natural soil is too shallow, too dense, or too close to the water table for a conventional buried field. The mound provides the filtering depth the natural ground lacks.

Drip Distribution Systems

A drip distribution system releases treated effluent slowly and evenly through a network of small tubing placed near the surface. By distributing the liquid gradually over a wider area, it works on sites that cannot absorb a concentrated flow, including shallow soils and irregular lots.

Choosing the Right System

No type is automatically best. The right choice comes out of the site evaluation and perc test, which reveal what your land can support. We design the system around those results rather than fitting your property to a system we prefer, and we explain why a given type suits your site before any work begins.

System Type	Best Suited For	Key Consideration
Aerobic Treatment Unit	Poor soil, sites needing higher treatment	Mechanical parts need regular maintenance
Mound System	Shallow soil, high water table, dense ground	Raised bed requires suitable space
Drip Distribution	Shallow soils, irregular or limited lots	Even, gradual dispersal over a wider area

Signs Your Property Needs an Alternative System

You usually do not go looking for an alternative system. You arrive at one because something about your property rules out a conventional setup. These are the most common situations where an alternative system becomes the answer.

Your Soil Failed or Struggled With a Perc Test

If a percolation test shows your soil drains too slowly or too quickly, a conventional drain field will not function properly. An alternative system is designed to work with the soil you have rather than the soil a standard system requires.

Rocky, Shallow, or Dense Ground

Much of Northern Arizona sits on ground that is rocky, shallow over bedrock, or dense and slow-draining. When there is not enough workable soil for a conventional field, an alternative system provides the treatment or distribution the ground cannot.

High Water Table

When groundwater sits close to the surface, a conventional drain field cannot safely filter effluent before it reaches that water. Alternative systems are built to treat wastewater more thoroughly or distribute it differently to protect the water table.

Steep, Small, or Difficult Lots

A steep slope, a small parcel, or an irregularly shaped lot can leave too little usable space for a standard field. Alternative systems can often fit and function where a conventional layout simply will not.

Both Kinds of Septic Expertise, Under One Roof

Alternative systems are not something every septic company is equipped to handle well. They require design knowledge, the right permitting experience, and familiarity with engineered components that a conventional-only outfit may not have. Because we design and install both conventional and alternative systems, we can look at your property and recommend what actually fits it, instead of pushing the only kind of system we know how to build.

That matters most at the start, when the question is which path your property even belongs on. A company that only installs conventional systems has a reason to call your site conventional. A company that handles both can give you a straight read on what your land needs, because either answer is one we can carry out.

It is also worth noting that we are recognized by the Arizona Department of Environmental Quality with the ADEQ Award for Environmental Excellence. Alternative systems exist largely to protect soil and groundwater on sensitive sites, so working with a company that takes environmental performance seriously is not a small thing when your system is the barrier between wastewater and the water beneath your property.

What Our Customers Say

Alternative Septic System FAQs

What is an alternative septic system?

It is a septic system engineered for properties where a conventional system will not work. Instead of relying on the soil alone to treat wastewater, an alternative system adds a treatment step, a different method of distributing the liquid, or both. Common types include aerobic treatment units, mound systems, and drip distribution. The goal is the same as any septic system: to treat wastewater safely, on a site that cannot do it the standard way.

Do alternative septic systems cost more than conventional ones?

Generally, yes. Alternative systems involve more engineering and, in some cases, mechanical components, so both installation and long-term upkeep tend to cost more than a conventional system. The honest way to think about it is that an alternative system is the cost of making a difficult property usable, and for many lots it is the only path to a working system. We provide a free quote based on your specific site so the number reflects your property rather than an estimate.

Do alternative systems need more maintenance?

Often, yes, particularly systems with mechanical parts like aerobic treatment units, which need regular servicing to keep working correctly. This is a real difference from a conventional system and worth planning for. Many owners of these systems keep up with service through our maintenance services, which handle the regular upkeep these systems depend on.

How do I know if I need an alternative system?

It comes down to what your property can support, which a site evaluation and perc test will tell you. If your soil, water table, slope, or lot size rules out a conventional system, an alternative one is the solution. We assess the site first and explain clearly which type fits and why before any work begins.