Every septic system starts as a design, and that design decides almost everything that follows: whether the system fits your property, whether it passes inspection, and whether it runs reliably for decades or causes problems from the start. Get the design right and the rest of the project has a solid foundation. Get it wrong and you are building on a mistake.

Septic system design is the engineering that matches a system to your specific property: your soil, your lot, your water table, and how the property will be used. It is especially important when you are building new, developing a parcel, or dealing with a site where a standard system will not simply drop in. Advanced Septic Service designs systems across the Verde Valley and both sides of Mingus Mountain, accounting for the real conditions of Northern Arizona properties rather than a generic template.

A good design also keeps a project moving. When the system is engineered correctly and documented properly the first time, permitting goes smoother and you avoid the costly delays that come from a plan that does not hold up to review.

What Goes Into a Septic System Design

A septic system design is more than a drawing. It is a plan built from real measurements of your property, engineered to handle your household’s needs and to satisfy the regulations that govern septic systems in Arizona. The design specifies the type of system, its size, where it goes on the lot, and how it will function given your particular soil and site.

The work centers on a few key questions. How much wastewater will the property generate, based on the number of bedrooms and intended use? How well does the soil absorb water, which determines what kind of drain field is feasible? Where on the property can a system legally and safely be placed, accounting for wells, property lines, slopes, and setbacks? The answers shape a design that fits your land rather than forcing your land to fit a standard plan.

A complete design also produces the documentation needed for permitting. In Arizona, septic systems must be approved by the county and the Arizona Department of Environmental Quality, and a properly prepared design is what moves that approval forward without back-and-forth.

The Septic System Design Process

Designing a system follows a logical sequence, where each step informs the next.

1. Site Investigation

We start by evaluating the property itself: the soil, the topography, the location of any well, and the space available for a system and its drain field. This site investigation is the foundation of the whole design, because everything else depends on what the land can support.

2. Perc Testing

A percolation test, or perc test, measures how quickly the soil absorbs water. The results determine whether the property can support a conventional drain field, needs an alternative approach, and how large the field must be. Soil that drains slowly needs a different design than soil that drains well, and the perc test is how we know which you have.

3. System Sizing and Selection

With the site and soil understood, we determine the right size and type of system. Sizing is driven largely by the number of bedrooms, which regulations use to estimate daily water use. This is also the stage where it becomes clear whether your property calls for a conventional system or an alternative septic system built for difficult conditions.

4. Design Documentation and Permitting Support

Finally, we prepare the design and the documentation needed for county and ADEQ approval. A design that is complete and correct the first time is what keeps permitting from stalling, so your project stays on schedule.

Local Knowledge Built Into Every Design

A septic design is only as good as its understanding of the ground it is drawn for, and ground is exactly what varies most from one property to the next in this region. A design that works on a flat lot with good soil near Cottonwood may be entirely wrong for a sloped parcel with rocky or slow-draining soil on the Prescott side. Designing well here means knowing the territory.

That regional knowledge is built into how we work, because this area is the only place we design for. We have seen the range of soils, slopes, and site challenges that Northern Arizona properties present, from the Verde Valley floor to the higher ground on the other side of Mingus Mountain. That experience shows up in designs that account for real local conditions instead of assuming ideal ones.

There is also a practical advantage in having the same company design and build the system. When the team that engineers your design is the team that installs it, nothing gets lost in translation between a designer who will never see the site and an installer working from someone else’s plan. The design is made to be built, by the people who will build it.

What Our Customers Say

Septic System Design FAQs

It varies with the property and the season. The site investigation and perc test are usually quick to perform, but the full timeline depends on soil conditions, the complexity of the site, and county and ADEQ review times. We give you a realistic timeframe up front so you can plan your project around it.