Arizona is one of the highest-risk termite states in the entire country. Maricopa County — home to Phoenix, Scottsdale, Chandler, Gilbert, Mesa, and every other city in the valley — is classified as Termite Infestation Probability Zone 1, the most severe category in the US building code framework. This is not a borderline classification: the warm climate, sandy soils, and year-round activity of Arizona termites make them a persistent threat that every homebuyer, seller, and owner needs to understand.
Unlike cold-climate states where termites go dormant in winter, Arizona termites remain active all twelve months of the year. They do not stop feeding, tunneling, or reproducing just because it is December. A Phoenix-area home that is not protected and inspected annually is an undefended target.
This guide covers everything from termite species identification to WDO inspection requirements, treatment options and costs, Arizona SPDS disclosure law, BINSR negotiation strategies, and prevention. Whether you are buying a home in Scottsdale, selling a 1985 Chandler ranch house, or simply trying to protect the home you already own, this is the resource you need.
I tell every buyer I work with: termites in Arizona are not a scandal — they are a weather condition. The question is never "has this house had termites?" The question is "has this house been properly treated and maintained?" A home with a documented, transferable Termidor warranty and annual inspection history is in better shape than a home with no treatment history at all. Let's talk through what the WDO report actually means before you make any decisions.
The Scale of Arizona's Termite Problem
Arizona's termite problem is not exaggerated. The data is striking:
- 4 of the 9 most destructive termite species in the United States are found in Arizona
- Maricopa County sits in Termite Infestation Probability Zone 1 — the highest risk category under International Residential Code (IRC) guidelines, on a scale of 1 to 4 where 1 is most severe
- The Arizona Department of Agriculture (AZDA) classifies Arizona as a "very heavy" termite-pressure region
- Annual termite damage statewide is estimated at $400 million or more in structural damage
- Termites consume wood 24 hours a day, 7 days a week, 365 days a year in Arizona — there is no cold season to give structures a break
Why is Arizona so termite-prone? Three factors converge:
- Warm temperatures: Termites are cold-blooded; warm soil means year-round activity and faster colony growth
- Sandy soils: Arizona's desert soils are easy for subterranean termites to tunnel through; clay-heavy soils in some areas can slow them, but not stop them
- Wood construction: The vast majority of Arizona homes built since the 1950s use wood-framed construction, which provides exactly what termites need
The Arizona Department of Agriculture regulates all pest control companies operating in the state under ARS Title 3, Chapter 20 (the Structural Pest Control Act). Pest control operators (PCOs) must be licensed through the AZDA, and the WDO inspection report form used in real estate transactions is an official state-regulated document.
Termite Species Found in Arizona
Understanding which type of termite you are dealing with determines which treatment is appropriate. In Arizona, there are two primary categories of concern: subterranean termites and drywood termites.
Subterranean Termites — Most Destructive
Subterranean termites are the most structurally damaging termites in Arizona, and arguably the most damaging pest in North America. They live in the soil and build mud tube highways from the ground up into the wood of your home. A mature colony can number in the millions of workers and consume significant structural wood within a year or two of unchecked infestation.
Desert Subterranean Termite
- Most common & destructive in Phoenix metro
- Lives in soil; mud tubes rise to wood above grade
- Can devastate structural wood within 1–2 years
- Swarms heavily: March–July
- Winged swarmers often enter homes through cracks
- Treatment: Liquid soil barrier (Termidor)
Arid-Land Subterranean Termite
- Common in higher-elevation AZ (Prescott, Flagstaff)
- Less common in low-elevation Phoenix metro
- Similar behavior: soil-dwelling, mud tubes
- Slower colony growth than Heterotermes aureus
- Treatment: Liquid barrier; same as desert species
Western Drywood Termite
- Second most common in Phoenix metro
- No soil contact needed — lives entirely in dry wood
- Infests wall framing, roof rafters, furniture
- Leaves hexagonal pellet frass (droppings)
- Smaller colonies; slower damage than subterranean
- Treatment: Fumigation or localized heat
Dampwood Termite
- Less common in hot, dry Phoenix valley
- Found where chronic moisture problems exist
- Leaking plumbing, irrigation, HVAC condensation
- Presence indicates underlying moisture issue
- Fix the moisture source; treatment is secondary
How to Identify Termite Activity: What to Look For
Signs of Subterranean Termites
- Mud tubes: Pencil-width tubes of dirt and debris on foundation walls, pipes, exterior block walls, or in the garage; these are the termite highways from soil to wood
- Swarmers (alates): Winged reproductives that emerge in huge numbers from March through July; often mistaken for flying ants; termite swarmers have equal-length wings and straight antennae
- Discarded wings: After swarming, termites shed their wings near windows, doors, and light sources
- Hollow wood: Tap wood members near the foundation; a hollow, papery sound suggests active tunneling inside
- Soil disturbance: Small mounds or disturbed soil near the foundation in garden areas
Signs of Drywood Termites
- Frass pellets: Tiny, hexagonal, seed-like droppings (about 1mm long); found in small piles on floors, windowsills, or surfaces below infested wood
- Kick-out holes: Small pin-sized holes in wood where termites eject frass from galleries
- Blistered or bubbling paint: As termites tunnel just beneath the surface of finished wood
- Hollow wood sound: Knock on suspected areas; hollow or papery sound indicates galleries inside
- Surface ridges: A maze-like pattern visible through thin paint or finish on infested wood
March through July is Arizona's primary subterranean termite swarmer season. If you see a large swarm of winged insects inside or immediately outside your home during this period — thousands of them emerging at once — that is almost certainly termite swarmers, not flying ants. This is a sign of an active nearby colony. Call a licensed WDO inspector immediately. Do not panic, but do not wait.
WDO Inspections in Arizona Real Estate Transactions
What is a WDO Inspection?
A WDO (Wood Destroying Organism) inspection — also called a "termite inspection" or "pest inspection" in common usage — is a comprehensive visual inspection of a home for evidence of:
- Active infestations: Live termites, active mud tubes, fresh frass deposits
- Past termite activity or damage: Old mud tubes, previously eaten wood, historical treatment evidence
- Other wood-destroying insects: Wood-boring beetles (powderpost beetles, old house borers), carpenter ants, carpenter bees (structural damage potential)
- Conditions conducive to WDOs: Wood-to-soil contact, wood debris near foundation, moisture accumulation, inadequate ventilation
The WDO inspector completes an official WDIR (Wood Destroying Insect Report) form, which is the standard state-regulated document used in Arizona real estate transactions. This form categorizes findings into: current infestation, previous infestation, previous treatment, conditions conducive, and inaccessible areas.
Who Can Perform a WDO Inspection?
In Arizona, WDO inspectors must be licensed through the Arizona Department of Agriculture (AZDA) as a Pest Management Professional with a structural pest control license. This is a state-regulated credential — ask to see it before accepting any inspection report.
Major WDO companies operating in the Phoenix metro include:
- Western Exterminator / Wil-Kil — major national operator; strong AZ presence
- Orkin — national brand; licensed Arizona operations
- Truly Nolen — founded in Tucson; strong Arizona roots; well-regarded statewide
- Arizona Pest Control — locally rooted; Tucson-based but Phoenix metro operations
- Bulwark Exterminator — Arizona-founded; strong local reputation in the valley
- Burns Pest Elimination — Phoenix-based; well-regarded for WDO work
- Eco Tech Pest Control — Phoenix metro; competitive pricing
WDO inspection cost: $75–$150 for a standard residential inspection. Many companies offer free WDO inspections to generate treatment business — this is a legitimate industry practice. Accept the free inspection but understand the inspector has a financial incentive to find treatable conditions. This does not mean they are dishonest, but if you receive a quote for expensive treatment on a free inspection, getting a second opinion is reasonable.
WDO Inspection Loan Requirements
Arizona loan programs have different WDO inspection requirements:
- VA Loans — REQUIRED: The VA mandates a WDO inspection (clear termite report or evidence of treatment) on every purchase using a VA loan. The seller typically pays for the WDO inspection and any required treatment on VA transactions — VA guidelines restrict what buyers can pay for, and WDO inspection cost is traditionally a seller expense on VA deals
- FHA Loans — Case-by-case: FHA does not automatically require a WDO inspection but may require one if the appraiser notes visible evidence of termite activity or conducive conditions
- Conventional Loans — Not required: WDO inspection is not a conventional loan requirement, but it is strongly recommended for buyer protection
- Cash purchases — Buyer's choice: No lender requirement, but why wouldn't you spend $100 to find out?
Arizona Disclosure Law: Termites, SPDS, and BINSR
The SPDS: What Sellers Must Disclose
Under ARS §33-422, Arizona sellers are required to complete a Seller Property Disclosure Statement (SPDS) that includes specific questions about termite and pest activity. Sellers must disclose:
- Whether they are aware of any current termite or other wood-destroying organism infestation
- Whether the property has been treated for termites or other WDOs, and when
- Whether they have a termite warranty or service contract, and whether it is transferable
- Whether there is any known termite damage to the structure
Sellers must answer these questions to the best of their knowledge. They are not required to conduct a WDO inspection to complete the SPDS — they must simply disclose what they know. However, withholding known information about a termite infestation or treatment constitutes a misrepresentation that can expose the seller to legal liability even after closing.
Always request the SPDS before making your offer, not after. If the seller discloses past termite treatment, that is valuable information you want before you negotiate price. A seller who discloses treatment and can provide documented warranty transfer is in a stronger position than a seller whose SPDS is blank on the termite question — because a blank SPDS on an older Phoenix home may mean the seller is unaware, not that the home is termite-free.
The BINSR Process: Termite Issues and Negotiation
Arizona's 10-day inspection period and BINSR (Buyer's Inspection Notice and Seller's Response) process is the mechanism buyers use to address termite findings from a WDO inspection:
Step 1: Inspection Period (Days 1–10 from contract acceptance)
The buyer hires a WDO inspector during the inspection period. The WDO inspection can be combined with the general home inspection or done separately. Cost is typically $75–$150 additional if separate.
Step 2: Receive the WDIR
The WDO inspector delivers the official Wood Destroying Insect Report. Findings fall into categories: current infestation, previous infestation (no current activity), previous treatment, and conducive conditions.
Step 3: BINSR Submission (before inspection period deadline)
If the WDIR reveals findings the buyer wants addressed, the buyer submits a BINSR requesting seller remediation. Common requests:
- Active infestation: Request seller pay for and complete full professional treatment before closing; require a clear WDO re-inspection after treatment
- Previous activity without current warranty: Request seller obtain a full liquid barrier treatment and one-year warranty; or request a closing cost credit equal to the treatment cost
- Conducive conditions only: May request correction of conditions (remove wood debris, fix wood-to-soil contact) or accept as-is
- Clear report with expired old warranty: May request seller renew the annual inspection contract for one year; or simply accept and budget for ongoing annual inspections yourself
Step 4: Seller Response (within 5 days of BINSR submission)
The seller has three options on each BINSR item:
- Agree: Seller accepts and will complete the requested treatment before closing
- Counter: Seller offers alternative (closing credit instead of treatment, partial credit, different scope)
- Reject: Seller declines to address the item; buyer can accept this and proceed, or — if unresolved items are material — exercise their right to cancel during the inspection period and receive their earnest money back
Active termite infestation found at WDO inspection is a legitimate, reasonable BINSR request — and most reasonable sellers agree to treatment rather than losing the deal. The treatment typically costs $1,200–$1,800 for a standard-size Phoenix home. Losing a deal over this amount makes no sense for sellers. Where I see buyers over-negotiate: demanding treatment for a 20-year-old inactive mud tube on an old ranch house that has had its annual inspections done faithfully. Read the room. Past activity with a maintained warranty is different from a current active problem.
Termite Warranties and Transferability
One of the most valuable things a seller can offer is a transferable termite warranty. Here is what to know:
- Termidor (Fipronil) warranties: Many pest control companies offer warranties tied to a Termidor treatment; when maintained with annual inspections, these are transferable to a new owner — ask the pest company directly
- Annual inspection requirement: To keep a warranty active, annual inspections are typically required; if the seller has missed years of inspections, the warranty may be lapsed and the treatment must be re-done
- What a transfer means: The new owner takes over the annual inspection contract and pays annual fees (typically $75–$150/year) to maintain the warranty; if future termite activity is found, the company treats under the warranty at no additional charge (or reduced charge)
- Verify directly with the pest control company: Have the company confirm in writing that the warranty is active, transferable, and the last inspection date
Termite Treatment Options and Costs
1. Liquid Barrier Treatment (Subterranean Termites)
The most common termite treatment in the Phoenix metro. A licensed pest control operator trenches or drills around and under the foundation and applies a professional-grade termiticide to the soil, creating a chemical barrier that termites cannot cross.
- Active ingredients: Fipronil (Termidor), Imidacloprid (Premise), Chlorantraniliprole (Altriset) — all EPA-registered, professional-grade products
- How Termidor works: Non-repellent; termites walk through the treated zone and transfer the chemical to other colony members (the "Transfer Effect"); this kills the entire colony, not just foragers
- Cost: $1,000–$2,500 for an average Phoenix home (1,500–2,500 sq ft); larger homes or homes with extensive perimeter are priced by linear footage
- Effectiveness duration: 5–10 years before reapplication may be needed; annual inspections extend protection by catching any new activity early
- Disruption: Low; residents can stay during treatment; landscaping near the foundation is minimally disturbed
- Post-tension slabs — CRITICAL WARNING: Many Phoenix-area homes (particularly those built from the 1980s onward) have post-tension concrete slabs. The post-tension cables within the slab CANNOT be cut, punctured, or drilled into without a structural engineer's approval. A liquid termiticide application on a post-tension slab must use the trenching method around the perimeter and under footer areas — NOT drilling through the slab. Confirm your pest control company is experienced with post-tension slabs before any treatment
2. Tenting / Fumigation (Drywood Termites)
Tenting with sulfuryl fluoride (Vikane) gas is the only treatment that achieves 100% kill of drywood termites throughout the entire structure, including eggs. It is required for widespread drywood infestations where multiple areas of the home are affected.
- Process: A large tent (tarpaulin) is placed over the entire home; the structure is sealed; Vikane gas is pumped in to lethal concentration; the home remains sealed for 24–48 hours; then the tent is removed and the home is aerated until gas levels clear
- Clearance: Third-party clearance test confirms it is safe to re-enter before residents return
- Cost: $1,200–$3,000 for an average Phoenix home; charged by "tarpaulin stacks" (a measure of cubic footage of the structure); larger two-story homes with complex rooflines cost more
- Disruption: Residents and ALL living things (pets, fish, plants) must vacate for 2–3 days; all food, medications, and anything consumable must either be removed or bagged in special Nylofume bags provided by the fumigation company
- Effectiveness: Kills 100% of all drywood termite life stages (eggs, nymphs, workers, soldiers, reproductives); highly effective
- No residual protection: Tenting kills the existing colony but leaves no chemical barrier; a new drywood infestation can occur months later; annual inspections are critical after fumigation
3. Localized Heat Treatment
For contained drywood infestations (a single wall cavity, an attic section, a piece of infested furniture), heat treatment raises the temperature of the targeted area to 120–135°F, which kills all life stages of drywood termites.
- Best for: Small, accessible, defined drywood infestations; areas where chemical treatment is not preferred (e.g., near food storage areas, special materials)
- Cost: $500–$2,000 depending on the size of the treated area
- Limitations: Does not penetrate the entire structure; not appropriate for a whole-home drywood infestation; cannot be used for subterranean termites
- No chemical residual: Same as fumigation — kills existing termites but leaves no ongoing protection
4. Orange Oil / D-Limonene Spot Treatment
Orange oil (D-Limonene, extracted from citrus rind) is a natural compound that kills drywood termites on contact by destroying their exoskeleton. It is frequently marketed as an "eco-friendly" alternative to fumigation.
- Reality check: Orange oil only works where it makes direct contact with termites; it cannot penetrate deep into wood gallery systems; it provides no residual protection
- Appropriate use: Very small, localized, accessible drywood infestations where the termite galleries are visible and accessible
- Not appropriate for: Widespread drywood infestations, any hidden infestations, subterranean termites (useless against soil-dwelling colonies)
- Ryan's recommendation: Be skeptical of pest control companies that aggressively pitch orange oil as an alternative to fumigation for a significant drywood infestation. If you have evidence of drywood termites in multiple locations in the home, get a second opinion and consider the full cost-benefit of fumigation vs. a spot treatment that may leave untreated colonies
5. Borate Treatment (Prevention)
Sodium borate (borates) applied directly to bare wood framing creates a long-lasting termite deterrent — termites that eat borate-treated wood die. Unlike liquid soil barriers, borates are applied to the wood itself.
- Best application: During construction, before drywall is installed; bare framing is easily treated
- Retroactive application: Possible during renovations when walls are open; requires access to bare wood
- Protection: Long-lasting (decades) if the wood does not get wet; borates are water-soluble and can leach out if exposed to sustained moisture
- New construction: Some custom and luxury builders in the Phoenix metro offer borate framing treatment as a standard or optional feature; worth asking about if building new
- Cost: $800–$2,000 during new construction depending on home size
Treatment Comparison Table
| Treatment Type | Termite Type | Kills Eggs? | Cost Range | Disruption | Residual Protection | Warranty Available? | Transferable? | Best For Scenario |
|---|---|---|---|---|---|---|---|---|
| Liquid Barrier (Termidor/Fipronil) | Subterranean only | Yes (colony kill) | $1,000–$2,500 | Low | 5–10 years | Yes | Yes | Standard treatment for Phoenix area homes; most purchase transactions |
| Tenting / Fumigation (Vikane) | Drywood only | Yes (100%) | $1,200–$3,000 | High (2–3 day vacate) | None | Limited (some companies) | Varies | Widespread drywood infestation; multiple locations in home |
| Heat Treatment (Whole House) | Drywood only | Yes | $2,000–$5,000 | High (1-day vacate) | None | Rarely | No | Alternative to fumigation; chemical-free preference |
| Heat Treatment (Spot) | Drywood only | Yes (targeted area) | $500–$2,000 | Medium | None | No | No | Small, contained drywood infestation in accessible area |
| Orange Oil / D-Limonene | Drywood (contact only) | No | $300–$1,000 | Low | None | No | No | Very small, visible accessible drywood only; limited use case |
| Borate (Prevention) | Both (on contact) | Partial | $800–$2,000 | Low | Decades (if dry) | Limited | N/A | New construction or renovation with open walls; long-term prevention |
| Bait Systems (Sentricon, etc.) | Subterranean | Slow colony elimination | $1,200–$2,000/yr | Very Low | Ongoing (annual) | Yes | Yes | Low-risk prevention; environmentally sensitive areas; add-on protection |
Table 1: Arizona termite treatment comparison. Costs reflect Phoenix metro market averages as of 2026. Always get 2–3 quotes from AZDA-licensed pest control operators. Post-tension slab warning: confirm treatment method compatibility before any liquid application near or under your slab.
Termite Risk by Phoenix Metro City / Area
| City / Area | Soil Type | Activity Level | Common Species | Swarm Intensity | WDO Insp. Frequency | New Home Builder Treatment | Avg Annual Treatment Cost | Ryan's Caution Level |
|---|---|---|---|---|---|---|---|---|
| Scottsdale (central/south) | Sandy loam | Very High | Desert Subterranean, Drywood | Heavy March–June | Annual minimum | Standard soil pre-treat | $125–$150/yr | High |
| Scottsdale (north/DC Ranch) | Decomposed granite | High | Desert Subterranean | Moderate | Annual | Standard; some luxury borate | $125–$150/yr | Medium-High |
| Paradise Valley | Sandy loam / caliche pockets | Very High | Desert Subterranean, Drywood | Heavy | Annual; major estates biannual | Custom builders vary; verify | $150–$300/yr (larger properties) | High — large structures, high stakes |
| Chandler | Mixed sandy / clay | Very High | Desert Subterranean | Heavy | Annual | Standard soil pre-treat (DR Horton, Meritage) | $100–$150/yr | High |
| Gilbert | Clay (heavy east Gilbert) | High | Desert Subterranean | Moderate–Heavy | Annual | Standard (most large builders) | $100–$150/yr | Medium-High |
| Mesa (central/west) | Sandy | Very High | Desert Subterranean, Drywood | Very Heavy | Annual — older homes biannual | Varies; older stock pre-1990s no standard | $100–$125/yr | High — many older homes |
| Mesa (east / Eastmark area) | Sandy loam | High | Desert Subterranean | Moderate | Annual | Standard (newer construction 2010+) | $100–$125/yr | Medium-High |
| Tempe | Sandy loam | Very High | Desert Subterranean, Drywood | Heavy | Annual — older ASU-area homes more often | N/A — mostly older built stock | $100–$125/yr | High — older housing stock |
| Phoenix (central — Arcadia, Biltmore) | Sandy loam | Very High | Desert Subterranean, Drywood | Very Heavy | Annual — biannual for 1950s–1970s homes | N/A — older stock | $100–$125/yr | Very High — many pre-1990 structures |
| Phoenix (north — 85085/Deer Valley/TSMC area) | Sandy / decomposed granite | High | Desert Subterranean | Moderate | Annual | Standard (new builds near TSMC campus) | $100–$125/yr | Medium — newer construction majority |
| Ahwatukee | Sandy loam / caliche | High | Desert Subterranean | Moderate–Heavy | Annual | Varies (mix of 1980s–2000s stock) | $100–$150/yr | Medium-High |
| Cave Creek / Carefree | Rocky / decomposed granite | Moderate | Desert Subterranean (less dense) | Light | Annual | Custom builders — verify | $125–$175/yr (larger lots) | Medium |
| Queen Creek / San Tan Valley | Clay / sandy loam | High | Desert Subterranean | Moderate | Annual | Standard (Taylor Morrison, Toll Brothers, AV Homes) | $100–$125/yr | Medium-High |
| Peoria / Surprise / Glendale (West Valley) | Sandy loam / clay | High | Desert Subterranean | Moderate–Heavy | Annual | Standard (most builders) | $100–$125/yr | Medium-High |
Table 2: Arizona termite risk by Phoenix metro city/area, 2026. Activity levels reflect general patterns; individual lots vary by soil moisture, irrigation, landscaping, and proximity to natural desert wash corridors. All Phoenix metro ZIP codes sit in Zone 1 (highest risk) under the US building code termite map.
Termites and New Construction in Arizona
If you are buying a new construction home in the Phoenix metro, termite protection is a standard part of the building process — but the details matter and vary by builder.
Pre-Construction Soil Treatment
Arizona building codes (following IRC Section R318) require new construction in termite-heavy zones to include one or more of the following protective measures:
- Soil pre-treatment: A termiticide is applied to the soil beneath and around the foundation before the slab is poured; this creates a chemical barrier that subterranean termites cannot cross
- Physical barriers: Some builders use Termimesh (stainless steel mesh) or similar physical barrier systems installed during construction
- Borate treatment: Some custom and luxury builders apply borate to framing members before drywall
Major Phoenix-area production builders (DR Horton, Lennar, Meritage Homes, Taylor Morrison, Toll Brothers, K. Hovnanian, Beazer) all apply soil pre-treatment as standard practice. Ask your builder:
- What termiticide product was applied? (Name, EPA registration number)
- Who applied it? (Licensed AZDA pest control company?)
- Is there a warranty, and if so, for how long and what does it cover?
- Is there a new homeowner service contract offered?
Post-Tension Slabs: The Critical Warning for Arizona
The majority of Phoenix-area homes built since the mid-1980s use post-tension concrete slabs. Post-tension slabs contain high-tension steel cables (tendons) embedded in the concrete. These cables are under enormous pressure and are what give the slab its structural integrity.
Under no circumstances should anyone drill into a post-tension slab without authorization from a licensed structural engineer. A pest control company applying liquid termiticide to the perimeter of a post-tension slab MUST use the trench-and-treat method, not drilling through the slab. If a pest control operator proposes drilling through an interior slab for termiticide injection on what you know is a post-tension slab, stop them and get a second opinion. Severing a post-tension cable can cause catastrophic structural damage and creates a life safety hazard. Ask: "Is my slab post-tension?" (If built after 1985 in the Phoenix metro, it very likely is.) Post-tension markers are typically visible as orange circles stamped into the concrete at the slab edges.
TSMC Corridor and North Phoenix New Development
The rapid development around the TSMC Fab 21 campus in north Phoenix (the Deer Valley/85085 corridor) is producing thousands of new homes. New master-planned communities including Norterra, Union Park at Norterra, and the growing neighborhoods east of I-17 along Happy Valley Road and Dove Valley Road are all new construction. These homes benefit from standard soil pre-treatment and modern post-tension slabs, making termite risk lower than older stock — but not zero. Annual inspections should begin in year two or three as builder warranty coverage transitions.
Homeowner Prevention: Protecting Your Investment
Prevention is cheaper than treatment. These practices reduce your risk and preserve the value of your home:
Reduce Wood-to-Soil Contact
- Never pile firewood, lumber, or wood debris directly against your home's exterior
- Keep wood stacks elevated on metal racks and away from the structure
- Remove dead tree stumps and roots near the foundation
- Ensure landscape timbers and railroad tie borders don't touch foundation walls
- Mulch beds should not be piled against stucco or siding — keep a 6-inch gap
Fix Moisture Sources
- Repair any plumbing leaks immediately; dampwood termites are attracted to wet wood
- Ensure irrigation systems don't saturate soil directly against the foundation
- Check HVAC condensate drain lines; they should drain away from the home's perimeter
- Repair leaking gutters and downspouts; ensure drainage flows away from the foundation
- Eliminate ponding water against the foundation after rain events
Annual Professional Inspection
- Budget $75–$150 per year for an annual WDO inspection by a licensed AZDA pest control operator
- An annual inspection catches activity early — before it becomes a $2,000+ treatment situation
- If you have an existing treatment warranty, annual inspection is required to keep it active
- Keep all inspection records; they become a selling point when you eventually sell
Monitor Your Own Home
- Walk the perimeter of your foundation monthly during swarmer season (March–July); look for mud tubes
- Check the garage, where wood storage and exposed framing members are common entry points
- Check attic framing annually for frass deposits (drywood) or unexplained wood damage
- If you see swarmers inside or near your home, document with a photo and call a pest company
A $125/year annual inspection that catches a new subterranean colony early — before it has established for 2–3 seasons — means a $1,500 treatment instead of a $2,500 treatment plus $10,000–$50,000 in structural repairs. The math is not complicated. I have had clients come to me with homes that had not had an inspection in 10 years. The conversations with buyers about that are uncomfortable. Keep your records current.
Arizona-Specific Home Inspection Concerns Beyond Termites
A WDO inspection addresses termites and wood-destroying organisms specifically. Your general home inspection should address these additional Arizona-specific items:
- R-22 refrigerant phaseout: R-22 (Freon) was phased out of production in January 2020. Older HVAC systems using R-22 are a real estate red flag — they cannot be recharged with legal refrigerant; the unit must be replaced. Check HVAC equipment age and refrigerant type
- Caliche: Hard calcium carbonate layer common in Arizona desert soils; can impact drainage, landscaping excavation, and pool installation costs; not structural but worth knowing
- Stucco water intrusion: Penetrations in stucco (windows, pipes, electrical boxes, hose bibs) are common moisture entry points; improperly sealed stucco allows water behind the wall system; look for staining, cracking, or soft spots near penetrations
- Zinsco and Federal Pacific electrical panels: Found in homes built from the 1950s through 1980s; both panel types have documented fire hazard histories due to breaker failure; a red flag on any home inspection; replacement is typically required by lenders
- Post-tension slab condition: Look for significant slab cracking, heaving, or settlement; while some minor cracking is normal, major movement can indicate problems with the post-tension system or expansive soils beneath
- Pool and spa condition: Arizona pools work hard; inspect equipment, coping, plaster, and decking; look for evidence of pool shell cracking or deck lifting near the pool edge
Putting It All Together: Buying and Selling with Termite Awareness
For Buyers: Your 10-Day Checklist
- Day 1: Schedule both a general home inspection AND a separate WDO inspection (or confirm the general inspector is AZDA-licensed for WDO)
- Day 3–5: Attend both inspections in person; ask the WDO inspector to walk you through findings
- Day 5–7: Review the WDIR report; if active infestation found, get treatment quotes from 2–3 companies
- Day 7–8: Submit BINSR with specific repair and treatment requests; be reasonable but thorough
- Day 9–10: Review seller's BINSR response; decide whether to accept, counter, or cancel
- If treatment is agreed: Verify treatment completion before closing; request the new warranty documentation or transferable warranty paperwork
For Sellers: Preparing Your Home
- Get a WDO inspection before listing; finding and treating any issues before buyers discover them keeps you in control of the narrative and the cost
- If you have a termite warranty: dig out the documentation; confirm it is active and transferable; this is a selling point
- Disclose accurately on the SPDS: past treatment with maintained annual inspections is not a problem; failing to disclose known issues is a legal liability
- Clear obvious conducive conditions before listing: remove wood debris, fix moisture drainage issues, trim landscaping away from the foundation
- Consider offering a 1-year annual inspection contract as part of closing — it costs $75–$150 and signals confidence in the property's condition
What to Ask When You Call Ryan
When you're ready to buy or sell in the Phoenix metro, here are the termite-specific questions I always address with my clients:
- Does this home have documented termite treatment history, and is the warranty transferable?
- What year was the home built, and what is the likely treatment status for a home of that age in this neighborhood?
- If the WDO report shows activity, what is this realistically going to cost to fix, and how should we handle it in the BINSR?
- Is this treatment history going to affect our financing (especially VA loans)?
- For new construction: what treatment did this builder use, and is there a warranty I should ask about?