What State Law Requires — And Where Testing Fits In
State mold laws vary widely. Some impose landlord disclosure requirements; others define mold as a habitability defect; a few establish testing obligations under specific conditions. Independent test documentation matters in all of them — because the law asks what you knew and when you knew it.
Mold Law by State
Each guide covers landlord disclosure obligations, tenant habitability remedies, real estate transaction requirements, and how independent testing documentation fits into disputes and transactions in that state.
California
California's Toxic Mold Protection Act (HSC §26140) requires landlord disclosure of known mold. The Transfer Disclosure Statement covers seller obligations in real estate transactions.
Read guideTexas
Texas Occupations Code §1958 (TMARR) is the strictest mold-services law in the US — it legally separates the inspector from the remediator on the same project. Property Code Ch. 92 governs tenant remedies.
Read guideFlorida
The Florida Mold-Related Services Act (F.S. Ch. 468 Part XVI) requires DBPR-licensed assessors and remediators, and §468.8419(1)(d) prohibits the assessor from remediating within 12 months. Hurricane context shapes everything.
Read guideNew York
NY Labor Law Article 32 prohibits the same licensee from both inspecting and remediating mold. NYC Local Law 55 of 2018 (Asthma Free Housing Act) imposes specific landlord remediation duties enforced by HPD.
Read guideMore on Mold Law
In-depth articles covering mold law, landlord and tenant obligations, disclosure rules, and how independent testing documentation supports your position.
What the Law Actually Asks For — and Why Testing Answers It
The legal question is almost never “was there mold?” — it's “what did you know, and when did you know it?”
Across nearly every state mold law, the trigger is knowledge. Landlord disclosure obligations attach when the landlord knew about the condition. Habitability claims require the tenant to give notice. Seller disclosure obligations cover what the seller knew at the time of sale.
A test report answers that question with something an opposing party can't easily attack.
An independent, test-only company produces a timestamped AIHA-accredited lab result from an inspector with no financial interest in the outcome. That's a harder document to dismiss than a landlord's self-assessment or a report from a company that also profits from remediation.
Timing matters too.
A clean test at closing gives a buyer a baseline — if conditions develop later, there's documented proof they weren't present at purchase. A test before a tenant moves in establishes what conditions existed on that date. Either way, the report creates a record that's far more useful in a dispute than anyone's recollection.