Who has to prove that the tenant caused the infestation?

The party relying on the exception has to establish it. A landlord charging a tenant under RCW 59.18.130(2) is asserting a fact — that this tenant caused this infestation — and the assertion has to be supported by something. In practice that means inspection findings, a treatment history for the unit and the units around it, and some evidence connecting the introduction to the tenant. A bill with none of that behind it is asserting the hardest element of the case without addressing it.

Does clutter or poor housekeeping mean I caused the infestation?

No, and it is worth separating the two ideas. Bed bugs are not attracted by dirt, food waste or poor cleaning — they feed on blood and are drawn to carbon dioxide and body heat, which is why immaculate homes and hotels get them. Clutter matters only because it creates more harbourage and makes treatment harder, and a landlord may fairly ask that it be reduced before treatment. That is a preparation issue, not proof of causation, and the distinction is worth making explicitly in writing if the two are being run together.

Can my landlord charge me because the bugs were found in my unit first?

Being the first to report is not the same as being the source, and in multi-family housing it often means the opposite — the household that notices first is frequently the one reacting most visibly to bites, not the one that has had the insects longest. Roughly a third of people show no skin reaction at all. If adjoining units, the units above and below, and the common areas have not been inspected, nobody has established where the infestation started.

What if the lease says I am responsible for all pest control?

RCW 59.18.230 provides that any provision of a lease waiving a section or subsection of the Residential Landlord-Tenant Act is against public policy and unenforceable, and that no rental agreement may require a tenant to waive or forgo rights or remedies under the chapter. A clause purporting to move the landlord's RCW 59.18.060(4) duty wholesale onto the tenant runs directly at that. Where a landlord knowingly uses an agreement containing a prohibited provision, the section allows the tenant to recover actual damages, statutory damages up to twice the monthly rent, costs and reasonable attorneys' fees.

Does RCW 59.18.130(2) cover the tenant's guests?

The subsection itself says "caused by the tenant". The wider language in the closing paragraph of RCW 59.18.060 is broader — it removes the landlord's duty and the tenant's remedies where the defective condition was caused by the conduct of the tenant, the tenant's family, an invitee, or another person acting under the tenant's control. So a landlord arguing that a specific visitor introduced the infestation is arguing under that paragraph rather than under 59.18.130(2), and still has to establish the facts.

How can anyone prove where bed bugs came from?

Usually nobody can, which is the honest answer and the reason these disputes turn on documentation rather than entomology. There are cases where the trail is clear — a second-hand mattress delivered on a dated invoice, a return from travel followed within days by a first report, an insect found in a suitcase. Absent something like that, the realistic evidence is negative — inspection results from surrounding units, the building's treatment history, and how long the population has plainly been established. A mature infestation with heavy staining and shed skins in multiple stages did not begin the week before it was reported.

Can I be evicted for refusing to pay an extermination charge?

Not for the charge itself. RCW 59.18.283 requires a landlord to apply any payment a tenant makes toward rent before applying it to damages, fees or other charges, and provides that the tenant's right to possession may not be conditioned on paying any monetary amount other than rent. A landlord may still pursue the charge by other lawful means, which is why it should be disputed in writing rather than simply ignored, and why rent should keep being paid in full and on time.

RCW 59.18.130(2) Tenant Costs | Washington Bed Bug Solutions

Q: What does RCW 59.18.130(2) actually say?

It is one of ten tenant duties in the section, and it reads that each tenant shall "properly dispose from his or her dwelling unit all rubbish, garbage, and other organic or flammable waste, in a clean and sanitary manner at reasonable and regular intervals, and assume all costs of extermination and fumigation for infestation caused by the tenant." The extermination clause is the tail of a waste-disposal duty, and it is limited by its own final four words. It does not make a tenant liable for every infestation found in the unit.

RCW 59.18.130(2) is the provision every extermination charge in Washington rests on, and it is limited by its own last four words. Here is the whole of it, in context. The section opens by requiring each tenant to pay rent and comply with applicable codes, “and in addition shall”:

“(2) Properly dispose from his or her dwelling unit all rubbish, garbage, and other organic or flammable waste, in a clean and sanitary manner at reasonable and regular intervals, and assume all costs of extermination and fumigation for infestation caused by the tenant”

The extermination clause is bolted to the end of a waste-disposal duty, and it does not say “infestation in the tenant’s unit”. It says caused by the tenant.

That is the whole fight. Not “found in your unit”, not “first reported by you”, not “got worse while you lived there” — caused by you.

What a causation case would have to contain

Rows 1 and 2 are the ones that decide it. An infestation reported in a connected building, where no adjoining unit was ever opened, has no established point of origin — and origin is what the statute makes the landlord's case turn on.

Why bed bugs are a poor fit for a causation argument

Three biological facts do most of the work here, and none of them is controversial.

They arrive by hitchhiking. Bed bugs do not fly, do not jump, and are not drawn to any condition inside a home. They are carried in — on luggage, in second-hand furniture, in a bag set down in an infested place, in a delivery. There is no act or omission by the occupant in that chain, which is what makes “caused by” so difficult to attach to anyone.

They travel between units. In any connected building they move along the continuous cavity behind shared walls, through outlet and switch boxes that open into it, up and down plumbing and electrical chases, and under doors into corridors. Treating one unit accelerates this rather than stopping it, because a hostile unit pushes survivors outward. The apartment guide maps the four routes in detail.

They are present long before they are noticed. Roughly one person in three develops no visible reaction to bites at all, and reactions in the rest often take days to appear and are easily attributed to something else. A population that has reached the point of being reported has usually been established for weeks or months.

Put together: the household that reports first is frequently the one reacting most, not the one that has had the insects longest, and the unit where they were first seen is not necessarily the unit they started in.

The other subsection landlords reach for

RCW 59.18.130(1) requires a tenant to “keep that part of the premises which he or she occupies and uses as clean and sanitary as the conditions of the premises permit.” It appears in bed bug arguments constantly, and it should not.

Bed bugs are not a sanitation insect. They feed on blood, orient to carbon dioxide and body heat, and are found in five-star hotels, new apartments and hospital wards. Cleanliness does not prevent them and dirt does not attract them — the Department of Health says so plainly, as does every extension entomology programme in the country.

Clutter is a separate and legitimate issue. It creates harbourage, it hides evidence, and it makes treatment slower and less effective, which is why preparation instructions ask for it to be reduced. A landlord is entitled to ask for reasonable preparation. What does not follow is that clutter caused the infestation, and if a charge letter runs the two together it is worth separating them explicitly in your reply.

What a lease can and cannot do

Standard leases increasingly carry a bed bug addendum. Some of what these contain is enforceable and sensible — a duty to report promptly, a duty to cooperate with preparation and to allow access, an acknowledgement that the unit was inspected and found clear at move-in. Read the last one carefully; if you signed it, it is a statement about the condition of the unit at the initiation of the tenancy, which is exactly the fact Duty A under RCW 59.18.060(4) turns on.

What a lease cannot do is move the statutory duty. RCW 59.18.230(1)(a) makes any provision waiving a section or subsection of the chapter unenforceable as against public policy, and 59.18.230(2)(a) prohibits a rental agreement requiring the tenant to agree to waive or forgo rights or remedies under the chapter. A clause reading “tenant is responsible for all pest control costs during the tenancy” in a multi-family building is trying to do precisely what those provisions forbid.

The remedy is not theoretical either. RCW 59.18.230(3) provides that where a landlord knowingly uses a rental agreement containing provisions known to be prohibited, the tenant may recover actual damages, statutory damages not exceeding two times the monthly rent, costs of suit and reasonable attorneys’ fees.

What to ask for, in writing

If a charge has been asserted against you, the useful reply is not an argument. It is a request for the material that would support the assertion, made in writing and dated:

The inspection report for your unit, including the technician’s findings on the extent and estimated age of the infestation.
The inspection reports for the units adjoining yours — above, below and either side — and the dates they were carried out.
The treatment history for your unit and the building over the previous twenty-four months.
The specific evidence on which the conclusion that you caused the infestation is based.
An itemised invoice showing what work was done, on what dates, at what address.

Ask for a written response by a stated date. A landlord who can answer all five has a case worth taking seriously. A landlord who answers none of them has told you something useful about what the file contains. The dispute guide turns this into a full demand letter, including what happens if the charge is taken out of your deposit instead.

If it comes out of the deposit

The rules change slightly when the charge is deducted rather than billed. RCW 59.18.280 requires the landlord, within thirty days of termination and vacation, to give a full and specific statement of the basis for retaining any of the deposit together with copies of estimates received or invoices paid to reasonably substantiate damage charges. Miss the thirty days and the landlord is liable for the full amount of the deposit and is barred from asserting any claim or defence for retaining it, absent circumstances beyond their control.

The subsection that gets least attention is 59.18.280(3)(b): damages not substantiated by that documentation may not be charged to the tenant, reported to a consumer reporting agency, tenant screening service or prospective landlord, or submitted to a third-party collection agency. For anyone worried about a rental history, that is the sentence to know.

General information, not legal advice. Whether a particular charge is enforceable depends on your lease, your building and the evidence in the file, none of which we have. For advice on your situation, contact the Tenants Union of Washington State, Washington Law Help, or a landlord-tenant attorney. Nothing here creates a legal relationship or substitutes for that advice.

The landlord’s side of it

None of this makes charging a tenant illegitimate. There are genuine cases: the second-hand bedroom set delivered three weeks before the first report, on an invoice, into a building with no infestation history and clear inspections all round it. Where that file exists, RCW 59.18.130(2) is exactly the provision it was written for.

The practical point for owners and managers is that the file has to be built at the time, not reconstructed afterwards. Inspecting only the unit that complained saves a few hundred dollars, loses the causation argument permanently, and — as the apartment operators’ page sets out — usually costs the building a second full treatment within two months.

We are not lawyers and nothing here is legal advice. If you need a written inspection report that records the extent and apparent age of an infestation, say so when you call, because a standard service ticket will not contain it.

RCW 59.18.130(2): When a Tenant Pays for Extermination