An acreage property in San Tan Valley offers something increasingly rare in the East Valley: real space, room for horses or a workshop, and privacy that a standard subdivision lot cannot match. It also comes with a different set of systems to understand before you buy, since many of these properties run on a private well, a septic system, and sometimes an unpaved, privately maintained road rather than city utilities and a paved street.
None of this should discourage a buyer who wants acreage. It simply means asking different questions than you would for a typical subdivision home, and budgeting for a different set of ongoing costs. Here is what to understand about wells, septic systems, and dirt roads before you make an offer on acreage in San Tan Valley.
Private Wells: What to Know
Most acreage properties outside municipal water service areas rely on a private well. An individual domestic well, known as an exempt well, generally has a pump capacity under 35 gallons per minute and is permitted through a Notice of Intent to Drill filed with the Arizona Department of Water Resources, with a filing fee of $100 to $150 depending on location. Well depth is the biggest driver of cost and varies by the local aquifer, so two properties a few miles apart can have very different drilling costs.
When buying a home with an existing well, the upfront drilling cost is already behind you, but it is worth understanding the age and condition of the pump, the pressure tank, and any storage cistern, along with recent water quality test results. All-in costs to drill a new well, including the pump, pressure tank, electrical hookup, and storage cistern where needed, generally run about $14,000 to $36,000, which is useful context if an existing well needs significant work or replacement.
San Tan Valley sits across parts of both the Pinal and Phoenix Active Management Areas, where Arizona has paused approval of new 100-year assured water supply certificates for large subdivisions relying solely on groundwater. This restriction targets new large-scale development, not an individual homeowner’s exempt well on an existing parcel, but it is a reason to confirm a property’s specific water situation carefully, especially if you have any plans involving further development or splitting the land.
Ask for the well’s depth, age, and most recent water quality and flow test results before removing your inspection contingency. A well that produces plenty of water in one season can still run low during peak summer demand, so recent data matters more than a single point-in-time test.
Septic Systems: Permits, Costs, and Upkeep
Most acreage properties without access to a sewer line rely on an onsite septic system, regulated primarily by the Arizona Department of Environmental Quality at the state level, with permitting and inspections handled by county health departments. A conventional septic system, which uses a buried tank and gravity-fed leach field on parcels with good soil percolation, typically costs about $8,000 to $15,000 to install. An alternative or engineered system, needed for poor soil, steep slope, or a high water table, typically costs more, in the range of $18,000 to $40,000.
| Requirement | Detail |
|---|---|
| Well setback | Minimum 100 feet from a private well in most unincorporated areas |
| Minimum lot size | Generally 1 acre for a conventional system in most unincorporated areas |
| Permit requirement | Installation permit required before construction, issued after a passing perc test |
| Recommended pumping | Every 3 to 5 years, per EPA guidance |
Arizona has no statewide requirement for a septic inspection at the time of sale, but it is highly recommended and often required by lenders. A pre-purchase septic inspection, separate from a standard home inspection, is the clearest way to understand the age and condition of an existing system, and the modest cost of an inspection is small compared to the cost of discovering a failing system after closing.
Dirt Roads: Jurisdiction and Maintenance
Not every road serving an acreage property is maintained by the county. Pinal County Public Works can confirm whether a specific road falls under county jurisdiction, a municipality, or private ownership, and the county makes an effort to grade dirt roads under its jurisdiction periodically, factoring in weather conditions and safety concerns rather than working from a fixed schedule.
Roads that are privately owned are generally the responsibility of the property owners who use them, often formalized through a private road maintenance agreement that spells out cost sharing and how upkeep decisions get made. Without such an agreement in place, maintenance responsibility can become a point of dispute among neighboring owners, so confirming whether one exists, and reviewing its terms, is worth doing before you buy.
Call Pinal County Public Works Road Maintenance directly to confirm whether the road serving a specific property is county-maintained, and ask your title company to check for any recorded private road maintenance agreement. This single call can save significant frustration after closing.
How This Affects Financing
Lenders generally require more documentation for a home on a well, septic, or private road than for a home on full municipal utilities and a paved, county-maintained street. Expect requests for water quality and quantity testing, a septic inspection, and, for a private road, documentation showing the property has legal and adequate access, which can include a recorded maintenance agreement or reliance on a state statute governing private road upkeep. Not every lender treats these details the same way, so working with a lender experienced in rural and acreage financing can help avoid surprises midway through a transaction.
The well’s depth, age, pump condition, and recent water quality and flow test results
The septic system’s age, last pumping date, and whether a pre-purchase inspection has been done
Whether the access road is county-maintained, and if not, whether a maintenance agreement exists
Whether the lender you are working with has experience financing acreage properties
Eventual well pump or pressure tank replacement
Septic pumping roughly every 3 to 5 years, plus eventual system replacement
A share of private road grading or repair costs if no county maintenance applies
Water quality treatment, such as a softener or reverse osmosis system, if testing shows a need
Acreage living in San Tan Valley offers a lifestyle that is genuinely hard to find elsewhere in the East Valley, and most of the systems that come with it are manageable once you understand how they work. If you are considering an acreage property, I would be glad to help you evaluate a specific home’s well, septic, and road situation as part of your search.
Frequently Asked Questions
How much does a private well cost in San Tan Valley?
All-in costs for drilling a well, including the pump, pressure tank, electrical hookup, and any needed storage cistern, generally run about 14,000 to 36,000 dollars, with depth as the biggest driver of cost. Buying a home with an existing well avoids this upfront cost, but budgeting for pump age, water quality testing, and eventual replacement is still worthwhile.
How much does a septic system cost in Arizona?
A conventional septic system, which uses a buried tank and gravity-fed leach field on parcels with good soil percolation, typically costs about 8,000 to 15,000 dollars. An alternative or engineered system, needed for poor soil, steep slope, or a high water table, typically costs about 18,000 to 40,000 dollars. A passing percolation test is required before a county health department will issue a permit.
Who is responsible for maintaining a dirt road in San Tan Valley?
It depends on whether the road falls under county, municipal, or private jurisdiction. Pinal County Public Works can confirm a road’s status, and dirt roads under county jurisdiction are graded periodically depending on weather and safety conditions. Private roads are generally the responsibility of the property owners who use them, often through a formal private road maintenance agreement that outlines cost sharing and upkeep.
Can I still drill a private well in San Tan Valley given Arizona’s groundwater restrictions?
Individual domestic wells, known as exempt wells, with a pump capacity under 35 gallons per minute, generally remain available through a standard Notice of Intent to Drill filed with the Arizona Department of Water Resources. The restrictions that paused new approvals apply to large-scale subdivisions that need to prove a 100-year assured water supply for groundwater-only developments, not to an individual homeowner drilling a single domestic well on an existing parcel. Confirming a property’s specific water situation with a knowledgeable professional is still worthwhile given how the rules can affect development plans.
Do lenders treat homes with wells, septic, or private roads differently?
Often, yes. Lenders commonly require water quality and quantity testing for private wells, a septic inspection, and documentation showing the property has legal, adequate access, which can include a recorded private road maintenance agreement if the home sits on a private road. Expect more documentation and potentially a longer closing timeline than a typical home on public utilities and a paved, county-maintained street.
How often does a septic system need to be pumped?
The EPA generally recommends pumping a septic tank every 3 to 5 years, though the right interval depends on household size, tank size, and water usage. A pre-purchase septic inspection, separate from a standard home inspection, is the best way to understand the condition of an existing system before buying.
👉 You can also check out this helpful video for a closer look at what San Tan Valley, AZ has to offer:
Considering an acreage property in San Tan Valley? I can help you evaluate the well, septic, and road situation for a specific home before you write an offer.
