Perc tests and stamped septic designs for the acreage, horse property, and foothill lots the Apache Junction sewer mains never reached. Permit-ready reports in 48 hours from a firm that only designs, never installs.
Start Your ProjectApache Junction counted 45,672 residents on July 1, 2025, up 18.6 percent from its April 2020 census base of 38,508. That pace puts it among the fastest-growing cities in Arizona, and the biggest driver is Superstition Vistas, the roughly 275-square-mile block of state trust land south of town where Blossom Rock and Radiance are open and selling homes on the first 2,783-acre parcel. Add US 60 commuter access to Mesa and the East Valley, plus horse property that stays comparatively affordable next to Maricopa County, and the growth is easy to explain. But the new masterplans are built on sewer from day one. A lot of the rest of Apache Junction is not.
Sewer here is not a city department. It belongs to the Superstition Mountains Community Facilities District No. 1, a community facilities district the City Council formed in July 1992, now doing business as the Apache Junction Sewer District. The district connected its first 1,000 customers in January 1996 and has grown to more than 170 miles of pipe, 2,800 manholes, three lift stations, and over 9,600 customers feeding a 3.0 million gallon per day water reclamation facility. And still the district states it plainly: not all properties can be connected, even with more than 170 miles of pipe in the ground. Availability gets decided parcel by parcel through the district's Sewer Service Inquiry. Water, for the record, is a different outfit entirely, split by address between the Apache Junction Water District and Arizona Water Company.
That leaves a wide septic belt around and inside the city. The 85119 grid between Lost Dutchman Boulevard and the Tonto National Forest boundary, along corridors like N Tomahawk Rd and N Morningside Rd, is horse country that commonly runs on private wells and septic. So do acreage lots off E 2nd Ave, parts of the northwest 85120 fringe, and the unincorporated pockets toward Goldfield Ghost Town and Lost Dutchman State Park. If you are building, replacing, or repairing a system out there, Pinal County wants a perc test and a stamped design before it issues a permit. Perc Test AZ handles the testing and the design and nothing else. We never bid installations, so nobody here profits from oversizing your system. Reports leave our desk permit-ready within 48 hours of field work. Call (602) 584-7430.
Pull the USDA soil survey for central Apache Junction and two names come back: Pinamt and Tremant, mapped together across the valley floor with Ebon, Carefree, and Antho units nearby. Pinamt is very deep fan alluvium, well drained, carrying 35 to 90 percent rock fragments and calcareous from top to bottom. Tremant is the one that changes designs. It holds a clay-enriched subsoil running 18 to 35 percent clay and a calcic horizon, the lime-cemented layer Arizonans call caliche, starting just 14 to 30 inches down with 15 to 60 percent calcium carbonate equivalent. Both series perc, but neither percs fast. The survey rates their permeability moderately slow.
The ground changes character on the northern fringe. Toward the Goldfield Mountains side of town, SSURGO maps a Gran-Wickenburg complex: shallow soils formed over decomposed granite, with the crumbly weathered rock geologists call grus showing up at 8 to 20 inches in Gran soils and 10 to 20 inches in Wickenburg, and harder rock below that. Wickenburg soil actually percs at a moderately rapid rate. The problem on a foothill lot is not the rate. It is that usable soil can run out two feet below grade, which pushes designs toward shallow trenches or alternative systems.
Testing is how you find out which lot you have before you spend design money on the wrong system. Arizona Administrative Code R18-9-A310 spells out the site investigation: soil profile evaluation at the depths the system will actually use, plus percolation measurement. On a Tremant flat, that means logging where the caliche starts and proving the rate around it, which sets your trench depth and disposal field square footage. On a Gran slope, it means backhoe pits deep enough to show the county exactly where the grus begins. We run the tests, log the profiles, and hand Pinal County numbers it can approve.
Percolation tests and backhoe pit soil evaluations under R18-9-A310, run on Apache Junction acreage from the 85119 horse-property grid to the Goldfield foothill fringe.
Stamped conventional and alternative system designs packaged for Pinal County Aquifer Protection review, sized to the perc rates your lot actually produced.
Builders and installers: we test and design only. Your client stays your client, and the installation bid stays yours.
Septic permits for Apache Junction do not come from City Hall or from the sewer district. On the Pinal County side of the city, which holds all but a few hundred residents, they come from the county's Aquifer Protection Program, operating under a delegation agreement with ADEQ out of 85 N Florence Street in Florence. The program permits conventional systems up to 24,000 gallons per day and alternative systems up to 3,000 gallons per day, inspects construction before anything gets buried, and answers at 520-509-3555. It is the same office we submit to for parcels across the rest of Pinal County, week after week.
The sequence is consistent: site investigation and percolation test first, then a design built on the measured rates, then submittal, county review, and the construction authorization your installer builds against. Most delays trace back to thin soil data, which a proper R18-9-A310 investigation prevents. If you want every form and fee laid out before you start, our step-by-step Pinal County septic permit guide walks the whole process. One wrinkle unique to this city: a small Maricopa County sliver of Apache Junction, about 383 residents by the latest census estimates, permits through Maricopa County instead, so confirm your parcel's county before you file.
Connection is voluntary while your septic system is working. Once it fails or needs repair, the district requires connection if sewer is actually available to your parcel. Availability is the catch: the district itself says not every property can be connected, even with more than 170 miles of pipe in the ground.
File a Sewer Service Inquiry with the district first. If your parcel cannot connect, you will need a Pinal County repair permit backed by a design, which is exactly the work we do.
It rarely kills a project, but it does reshape the design. On the valley floor, Tremant soils carry a lime-cemented calcic layer starting 14 to 30 inches down that slows perc rates and can force deeper excavation or a larger disposal field. On foothill lots, Gran and Wickenburg soils hit weathered granite at 8 to 20 inches, so depth, not perc rate, becomes the constraint.
Either way the answer is engineering, not luck. We test at the depths Pinal County requires and design to what the ground actually does.
Yes. Any new onsite wastewater system in Pinal County requires a site investigation under Arizona Administrative Code R18-9-A310, including soil evaluation and percolation testing, before the county will issue a construction authorization.
That holds whether you are building new up N Tomahawk Rd or replacing a worn-out system off E 2nd Ave. The test data drives the disposal field sizing on your permit.
Forty-eight hours from field work to a permit-ready report. That includes the soil logs, the perc data, and the documentation Pinal County's Aquifer Protection Program expects in a submittal.
Because we only test and design, nothing waits in line behind an install crew. Call (602) 584-7430 to get on the schedule.
Call (602) 584-7430 or tell us about your parcel online. We schedule fieldwork fast and deliver permit-ready reports in 48 hours.
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