Maricopa County, AZ
Septic systems and home sales in Maricopa County
Updated · Editorial team; not yet technically reviewed
Short answer
When a Maricopa County property on septic is sold, the seller must have a qualified inspector inspect the system within six months before the transfer, have the tanks pumped of any significant waste, and give the buyer the inspection report before closing. The buyer then files a Notice of Transfer within 15 days.
What Maricopa County handles
Anyone selling or transferring a property served by a septic or alternative on-site system must have a qualified inspector inspect it within six months before the transfer. [1]
The inspector completes a Report of Inspection for the seller, and any significant amount of waste must be pumped from each tank. [1]
Before closing, the seller gives the buyer the inspection report and any permit or maintenance documents they hold. [1]
Within 15 calendar days after transfer, the buyer submits a Notice of Transfer for the change of ownership; the six-month inspection rule comes from Arizona rule and overrides conflicting contract terms. [1]
Where septic is common in the county
Most homes in Phoenix, Mesa and the other large cities are on sewer. Septic systems are common on larger lots and in unincorporated areas on the edges of the valley. A listing on septic should say so; if you're unsure, county records or a camera inspection can confirm where the house drain goes.
What a buyer should read in the report
- Tank condition and baffles, and whether pumping was done.
- Drain field condition and any signs of saturation.
- Whether the system is conventional or an alternative system with its own maintenance needs.
- Any repairs the inspector says are needed before the system is reliable.
Hard water and septic
Valley water is hard, and many homes add softeners. Ask a plumber where the softener discharges; the Phoenix city page covers local hardness, and water softener installation covers sizing.
City-specific guides in Maricopa County
Common questions
When must a Maricopa County septic system be inspected before a sale?
Within six months before the property transfers.
Who pays for the Maricopa County septic transfer inspection?
The rule puts the duty on the seller to retain a qualified inspector.
Does the septic tank have to be pumped before a Maricopa County sale?
Any significant amount of waste must be pumped from each tank as part of the inspection.
What does a Maricopa County buyer receive about the septic system?
The Report of Inspection and any permit or maintenance documents the seller has, before closing.
What does a Maricopa County buyer file after closing?
A Notice of Transfer within 15 calendar days.
Can a purchase contract waive the Maricopa County septic inspection?
No. The six-month inspection is an Arizona rule that overrides conflicting contract terms.
Which Arizona rule sets qualifications for transfer inspectors?
A.A.C. R18-9-A316.
Are alternative septic systems covered by the transfer rule?
Yes. The rule covers conventional and alternative on-site systems.
How do I know if a Valley home is on septic?
Check the listing and county records; a camera inspection of the house drain also shows where it goes.
Can a water softener affect a septic system?
Its discharge adds water and salt to the system, so ask a plumber where yours drains.
Cities and services in Maricopa County
- Plumbing services in PhoenixHard water runs through most Phoenix plumbing calls. Scale shortens water heater life and clogs tankless heat exchangers and aerators, and slab homes …
- Plumbing services in MesaMesa's water source depends on the zone: central Mesa gets Salt and Verde River water, and the fast-growing east and south get Colorado River water. M…
- Plumbing services in ChandlerChandler's water is some of the hardest in the Valley by the city's own numbers, averaging 16.5 grains per gallon. Most homes date from the 1990s and …
- Plumbing services in GilbertGilbert is one of the youngest large towns in the country by housing: the median home was built in 2004 and fewer than one in twenty predates 1980. It…
- Plumbing services in GlendaleGlendale, on the west side of the Phoenix metro, leans heavily on the Colorado River, which supplies about 40% of its water. Its neighborhoods are mos…
- Plumbing services in ScottsdaleScottsdale's water gets harder the farther south you live: 16 to 18 grains per gallon in the north and up to 25 in the south. About two-thirds of it c…
- Plumbing services in TempeTempe is older than its East Valley neighbors: the median home dates to 1986, and over a third of homes predate 1980. Combined with hard Valley water …
- Plumbing services in PeoriaPeoria stretches from older neighborhoods near Grand Avenue to master-planned communities in the north, and its water changes with it: different treat…
- Plumbing in ArizonaStatewide code, licensing and climate for Arizona.
Sources (1)
- Maricopa County Environmental Services, Onsite Wastewater Ownership Transfer · checked 2026-10-03