Mold Testing for Landlords in Spokane and North Idaho

If a tenant has told you there is mold, the thing that protects you is not a cleaning receipt. It is a dated, third-party record showing what the conditions actually were, what you did about it, and what the conditions were afterward. Washington does not require you to test. It does require you to maintain the unit and to give tenants written information about indoor mold. When a complaint turns into a dispute, the landlord with instrument readings, lab results and a chain of custody is in a completely different position than the landlord with a memory of a phone call.

We test only. We do not perform remediation and we take no referral fees from remediation companies, which is precisely what makes our report usable by you. A report written by the company that then billed you $9,000 to fix what it found is easy for the other side to characterize, and it should be.

What Washington actually requires of you

RCW 59.18.060 sets the landlord's duties under the Residential Landlord-Tenant Act. Two parts matter here. The general duty is to keep the premises fit for human habitation and to maintain the structure, plumbing and weather protection in reasonable working order. Separately, the statute requires you to provide tenants with written information about the health hazards associated with exposure to indoor mold, using or reflecting the information developed by the Department of Health. That is a notice duty, not a testing duty.

RCW 59.18.070 sets the clock once a tenant gives you written notice of a defective condition. The response windows are 24 hours for loss of hot or cold water, heat, or a hazardous condition, 72 hours for a refrigerator, range and oven, or a major plumbing fixture supplied by the landlord, and 10 days for other defects. Mold complaints generally arrive attached to a water problem, which means the underlying condition may sit in one of the shorter windows even though "mold" itself has no assigned timeline.

There is no mold testing mandate in Washington and none in Idaho. Idaho does not license mold work at all, and habitability duties there run through general landlord-tenant law rather than a mold-specific statute. So testing is not compliance. Testing is evidence, and it is dispute-driven.

There is also no state or federal numeric standard for airborne mold. No agency publishes an action level in spores per cubic meter. Anyone who tells you a result "passes" or "fails" against a legal limit is describing something that does not exist. What a report can do is compare indoor conditions to the outdoor air at the same property on the same day and document moisture conditions in the building. That is the actual analysis.

What a defensible record looks like

The value of documentation is not that it proves you were right. It is that it makes your version of events checkable by someone who was not there.

The single most common gap we see in landlord files is the last row. Owners document the complaint and the invoice and nothing else. If the tenant later claims the problem was never fixed, an invoice proves you spent money. Post-remediation verification proves the condition changed.

When testing is worth it and when it is not

We will tell you on the phone if a test will not answer your question. Some honest cases where it is not the right spend:

• Visible growth with an obvious active leak, in a unit you are going to repair anyway. You do not need a lab to tell you to fix the leak. Photograph it, fix the source, then verify after.
• A small amount of surface growth on a bathroom ceiling with a fan that does not work. That is a ventilation repair.

Cases where testing usually pays for itself:

• A tenant has made a written habitability complaint and you expect it to escalate.
• A tenant reports symptoms and you need to know whether there is anything in the building to find.
• You suspect the moisture is occupant-driven, meaning condensation from ventilation habits rather than intrusion through the envelope, and you need something better than an argument. Moisture mapping distinguishes these. Condensation clusters on the coldest surfaces, tracks interior humidity, and leaves the wall cavity dry. Intrusion does not.
• You are taking over a unit and want a baseline before a new tenancy.
• Work was performed and you want independent verification before you close the file.

What the inspection includes

A typical unit takes one to two hours on site. Larger properties run three to four.

• Air sampling with a calibrated pump drawing a measured volume through an Air-O-Cell or Allergenco-D spore trap cassette, submitted to an accredited lab for direct microscopic examination
• An outdoor control sample on every job, without exception
• Surface sampling by swab or tape lift where growth is visible, to confirm whether it is actually mold
• Moisture mapping with pin and pinless meters
• Thermal imaging to locate temperature differentials behind intact surfaces
• Borescope inspection of wall cavities where needed
• Psychrometric readings by area and outdoors: relative humidity, temperature and dew point
• A written report with photographs, readings, lab data and chain of custody

Post remediation clearance runs 45 to 60 minutes and includes a visual check of the remediated area and containment, air samples inside containment plus an outdoor control, evaluated against IICRC S520, the industry standard for professional remediation.

Pricing

Lab results normally come back in one to three business days, with the report within a day of that. If you own multiple units at one address, tell us the count when you book so we can schedule them into a single visit rather than separate trips.

Why the independence is the point

Washington's Department of Health says plainly that there are no certification requirements for mold work in this state and that anyone can call themselves a mold specialist without training or credentials. Idaho is the same and does not license home inspection either. So the credential on a business card is not the thing to evaluate.

The thing to evaluate is who profits from the finding. New York made it illegal under Labor Law Article 32 for one company to both assess and remediate the same job, on the straightforward theory that the assessment cannot be trusted when the assessor writes the repair estimate. Washington and Idaho have no such rule. We follow it anyway, because a report you may need to rely on later is worth nothing if the other side can point at our invoice for the cleanup.

We are also careful about health language, and you should want that in a document with your name on it. CDC has never established a causal link between Stachybotrys and serious illness, and says no test proves an association between a specific mold and particular health symptoms. What is documented is allergic reaction, asthma triggering and upper respiratory irritation in sensitive people, plus serious fungal infection risk in the severely immunocompromised. A report that overclaims on health is a liability, not an asset.

Landlord questions

Am I required to test if a tenant asks me to? No. Neither Washington nor Idaho requires mold testing. You are required to maintain the unit and, in Washington, to provide the written mold information described in RCW 59.18.060. Testing is a choice you make because you want a record.

If the tenant caused it, do I still have to do anything? Habitability duties and cause are separate questions and you should get legal advice on your specific situation. What testing does is establish the moisture pattern, which is usually what the disagreement is actually about. We do not assign fault. We document conditions.

Can I use your report to support charging a tenant at move-out? You can use it as documentation of conditions on a given date. Whether it supports a deposit deduction is a legal question for your attorney, and it depends heavily on move-in documentation. A baseline report at the start of a tenancy is far more useful for this than a report at the end.

Do you talk to my tenant? We will explain what we are doing and answer factual questions on site. We report to whoever engages us. We do not offer opinions to either party about fault, and we do not sell anyone anything.

How fast can you turn a report around? Standard is one to three business days for lab plus a day for the report. Rush lab is $100 and gets results in 24 hours.

What if the results come back normal? Then you have a dated, independent document saying so, produced by someone with no financial reason to find a problem. For a landlord facing a habitability complaint, that is often the most valuable possible outcome.

Book a unit inspection

Call with the address, the unit count, and a short description of the complaint. We will tell you whether testing is the right next step and what it will cost before we schedule anything.