Last updated: November 5, 2026
Short answer: When you buy a home with a septic system in Avondale, AZ, or anywhere in Arizona, state rules require a transfer of ownership inspection. The seller hires a qualified inspector within six months before closing and gives you the Report of Inspection. After closing, the buyer files a Notice of Transfer within 15 calendar days.
Key takeaways
- Arizona rule A.A.C. R18-9-A316 requires a septic inspection before a home changes owners.
- The seller hires the inspector, within six months before the transfer, and gives you the report before closing.
- The buyer files a Notice of Transfer within 15 calendar days after closing. In Maricopa County the fee is $60 per parcel.
- The rule takes precedence over any contract terms that conflict with it.
Want to talk it through? Book a time to chat with me (30 minutes, 9 AM–7 PM Arizona time).
¡Qué tal! I'm Rosie Armenta. If you're moving to the West Valley and looking at homes on bigger lots, you may see "septic" in a listing for the first time. It's not a reason to walk away. It's a reason to know the rules, because Arizona has a specific inspection for it, and you'll want the report in hand before you close.
How do I know if a home has septic instead of city sewer?
Start with the listing and the seller's disclosures, but don't stop there. The Arizona Department of Real Estate's Buyer Advisory says that if a home isn't connected to a public sewer, it's probably served by an on-site wastewater treatment facility, which is a conventional septic system or an alternative system. It also says that even when a listing says "sewer," a plumber, home inspector or other professional should verify it.
Maricopa County Environmental Services has a septic system search on its website, so you can look up county records for the property. Ask your home inspector to confirm what they see, too.
Who has to order the septic inspection in Arizona?
The seller. Under A.A.C. R18-9-A316, the person transferring the property must hire a qualified inspector within six months before the transfer. Maricopa County says this requirement is part of Arizona rule and takes precedence over any conflicting terms in a contract.
| Step | Who does it | When |
|---|---|---|
| Transfer of ownership inspection | Seller hires a qualified inspector | Within six months before closing |
| Report of Inspection to the buyer | Seller | Before closing |
| Permit and maintenance papers to the buyer | Seller (the ones they have) | Before closing |
| Notice of Transfer and fee | Buyer (escrow often files it) | Within 15 calendar days after closing |
The ADEQ Notice of Transfer FAQ says the rule applies to any transfer of ownership, not just a sale. It also notes that in many transactions, the escrow officer files the Notice of Transfer and fee for the buyer as part of closing. Ask your escrow officer whether they'll file it.
What does the septic inspector check?
The inspector fills out a Report of Inspection on a form approved by ADEQ. Under the rule, the report covers:
- The physical and operational condition of the system, plus any deficiencies the inspector sees and any repairs completed.
- Whether each septic tank was pumped or serviced. The rule allows only a few reasons to skip it, such as a tank with no waste buildup.
- The date of the inspection.
If a property has more than one system, Maricopa County says the inspector completes a report for each one. The rule also lists who can be an inspector, such as an Arizona-registered engineer or sanitarian, or a contractor with certain Registrar of Contractors licenses, along with a recognized training certificate.
What papers should I get before closing?
Before closing, the seller gives you the Report of Inspection and any documents they have about the system's permits, operation and maintenance. Read them with your inspector. Look at:
- The inspection date, so you know it's within six months of your closing date.
- Deficiencies and whether repairs were done.
- Whether the tank was pumped, or why it wasn't.
- Any alternative system that may need a maintenance contract. Ask the seller for those papers.
A septic system is one more thing to look at during your inspection period. My post on what happens at an Arizona home inspection explains how that period works.
What if the septic report shows a problem?
You and the seller can talk about it like any other inspection item. Here's a made-up example to show the options.
Example only: made-up round numbers, not real Avondale prices.
| Example only | Option A | Option B | Option C |
|---|---|---|---|
| Septic repair quote | $5,000 | $5,000 | $5,000 |
| What happens | Seller fixes it before closing | Seller gives a $5,000 credit, if your lender allows it | Price drops by $5,000 |
| What to ask for | Paid invoice from a licensed contractor | Credit written into the contract | New price written into the contract |
Every deal is different, and the contract sets your deadlines. If the issue is bigger than you're comfortable with, talk with me about your options during the inspection period.
What is the Notice of Transfer, and what does it cost?
The Notice of Transfer tells the county that the septic system has a new owner. Under the rule, the buyer must file it within 15 calendar days after the transfer. Maricopa County Environmental Services says the fee is $60 per parcel, and you can file online through its Permit Center. One notice per parcel can cover more than one system on that parcel.
Are there homes where the septic inspection isn't needed?
One exception: if ADEQ issued a Discharge Authorization but the system was never put into service before the transfer, the rule says no inspection is needed. The ADEQ FAQ says this usually happens when a builder sells a new home to its first owner. The buyer still files the Notice of Transfer.
Also know that Maricopa County says cesspools can't be used for sewage disposal under Arizona rule, and its transfer form isn't for them. If anyone mentions a cesspool, ask the inspector and the county before you go further.
How do I check a septic system before I buy, step by step?
- Confirm sewer or septic. Check the listing and disclosures, search Maricopa County's septic records, and ask your inspector to verify.
- Ask for the Report of Inspection early. Check that it's dated within six months of your closing date.
- Ask for the system's papers. Permits, pumping records and any maintenance contract the seller has.
- Review it during your inspection period. Go over deficiencies with your home inspector.
- Negotiate any repairs. Put what you agree on in writing.
- Make sure the Notice of Transfer is filed. Ask escrow if they're filing it, and keep a copy.
Moving from out of state? My post on buying a home in Avondale from out of state covers how that works from a distance. I also do live video tours, so you can see the yard and the home in real time.
Save this for when you start looking at homes on bigger lots.
Related questions I get a lot: what closing costs to expect when buying in Arizona and the hidden costs of buying a home in Avondale.
Looking at a home with septic? Book a time to chat with me (30 minutes, 9 AM–7 PM Arizona time), or call or text me at 623-295-5770.
Frequently Asked Questions
Is a septic inspection required to sell a house in Arizona?
Yes. Arizona rule A.A.C. R18-9-A316 requires a transfer of ownership inspection of a septic or alternative system within six months before the property is transferred.
Who pays for the septic inspection in Arizona?
The rule says the seller hires the inspector. Who pays can still come up in negotiations, so check your contract.
How long is a septic inspection good for in Arizona?
The inspection has to happen within six months before the transfer of ownership. Check the date on the Report of Inspection against your closing date.
Does the septic tank have to be pumped for the inspection?
Usually, yes. The rule allows only a few exceptions, such as a tank with no buildup of floating or settled waste.
What is a Notice of Transfer for a septic system?
It's a form the buyer files within 15 calendar days after closing to show the system has a new owner. In Maricopa County the fee is $60 per parcel.
Can escrow file the septic Notice of Transfer for me?
Often, yes. The ADEQ FAQ says escrow officers file it for the buyer in many transactions. Ask your escrow officer to confirm.
Do new homes with septic need a transfer inspection?
If the system was never put into service before the transfer, the rule says no inspection is needed. The buyer still files the Notice of Transfer.
How do I find out if a house is on septic in Maricopa County?
Check the listing and disclosures, search Maricopa County Environmental Services' septic records, and ask your home inspector or a plumber to verify.
I'm a real estate agent, not a septic inspector, an engineer or an attorney. I can't tell you whether a specific septic system is in good condition or meets the rules. Please rely on a qualified inspector, Maricopa County Environmental Services or ADEQ for that.
This article is general information, not legal, tax, or financial advice. Please talk with a licensed attorney, CPA, or lender about your situation.
About the author
Rosie Armenta | West USA Realty. Avondale (85392) is her home base, and she helps buyers and sellers across the West Valley in English and Spanish. Book a time to chat with me (30 minutes), or call or text 623-295-5770. Selling? Get a home value report.
Rosie Armenta | West USA Realty | Equal Housing Opportunity
Information was checked on November 5, 2026, from Arizona Administrative Code R18-9-A316, the Maricopa County Environmental Services onsite wastewater ownership transfer page, the ADEQ Notice of Transfer FAQ and the Arizona Department of Real Estate Buyer Advisory (January 2025). Rules and fees can change, so please confirm current requirements with Maricopa County Environmental Services or ADEQ.