Massachusetts Mold Law: Tenant Rights, Disclosure & Insurance
Does Massachusetts license mold work?
No Massachusetts mold assessor or mold remediator licence or certification was identified. Massachusetts regulates rental housing conditions (including mold) through the Department of Public Health's State Sanitary Code, 105 CMR 410.000, enforced by local boards of health, but that is a CONDITIONS standard, not an occupational licence for the people who assess or remediate mold. Mold remediation contractors performing construction work would be covered by general construction supervisor / home improvement contractor registration (M.G.L. c. 142A), which is not mold-specific. This is an unverified NEGATIVE — no primary source affirmatively stating 'Massachusetts does not license mold professionals' was obtained.
Habitability: what landlords must provide
Massachusetts has a robust judicially created implied warranty of habitability: Boston Housing Authority v. Hemingway, 363 Mass. 184 (Mass. Mar. 5, 1973) held that residential leases carry an implied warranty that 'the premises are fit for human occupation,' rejecting caveat emptor and holding the landlord's duty to maintain habitable premises and the tenant's duty to pay rent are 'interdependent and mutual considerations.' MOLD IS EXPRESSLY NAMED in the regulatory standard that fleshes out habitability: 105 CMR 410.500(A)(1) (as revised effective April 2023) requires every owner to maintain buildings and structural elements so they are 'Protected from wind, rain and snow, and are watertight, free from excess moisture or the appearance of mold, and pest resistant.' 105 CMR 410.500(B) adds a hard water-damage deadline: 'In the event of leaks and flooding, the owner shall ensure all surfaces have been dried within 48 hours from the time they are notified or the end of the event, whichever is sooner.' Massachusetts is therefore one of the strongest states in this group: mold and water intrusion are named in the housing code, and a sanitary code violation creates a presumption supporting the habitability defense. (Boston Housing Authority v. Hemingway, 363 Mass. 184 (1973); 105 CMR 410.500(A)(1) and 410.500(B); M.G.L. c. 239, § 8A)
Notice and repair timeline
Two verified timelines. (a) M.G.L. c. 111, § 127L: owner must BEGIN repairs (or contract for them) within 5 days after notice and SUBSTANTIALLY COMPLETE them within 14 days after notice, or the tenant may repair and deduct. (b) 105 CMR 410.500(B): in the event of leaks and flooding the owner must ensure all surfaces are dried within 48 HOURS of notification or the end of the event, whichever is sooner — a mold-prevention deadline unique among these five states.
Tenant remedies
(1) REPAIR AND DEDUCT — M.G.L. c. 111, § 127L: if the owner fails to begin repairs within five days after notice or to substantially complete them within fourteen days after notice, the tenant may make the repairs and deduct the cost, but 'A tenant may not deduct pursuant to this section an amount greater than four months' rent in any twelve-month period, or period of occupancy, whichever is shorter.' This is one of the most generous repair-and-deduct caps in the country. (2) RENT WITHHOLDING — M.G.L. c. 239, § 8A: tenant may raise conditions as a defense/counterclaim to a possession action, recovering 'the difference between the agreed upon rent and the fair value of the use and occupation of the premises'; proof of a sanitary/building code violation 'shall create a presumption that conditions existed'; written notice of a board of health inspection 'shall create a presumption that on the date such notice was received, such person knew of the conditions.' Four conditions apply (owner knew before arrears; landlord did not cause the condition; not a hotel/motel/short-term rooming house; conditions do not require vacating). If satisfied, 'There shall be no recovery of possession.' (3) Quiet enjoyment damages under M.G.L. c. 186, § 14 and unfair-practice claims under M.G.L. c. 93A are commonly pleaded in Massachusetts mold cases but were NOT verified this session. (4) Constructive eviction — common law, unverified this session.
Selling a home: mold disclosure
UNVERIFIED / likely none. No general Massachusetts statutory seller residential-property-condition disclosure duty was located; Massachusetts is traditionally a caveat emptor jurisdiction for sellers, subject to liability for affirmative misrepresentation and for partial/half-true statements, plus statutory carve-outs (lead paint, M.G.L. c. 111, § 197A). Licensed brokers have a separate affirmative duty to disclose known material defects under Board of Registration of Real Estate Brokers regulations (254 CMR 3.00) — this citation was NOT verified from a primary source this session. Treat Massachusetts as: no mold-specific seller disclosure duty confirmed. (None identified (no general seller disclosure statute located). Broker duty possibly at 254 CMR 3.00 — unverified.)
Deadlines to bring a claim
M.G.L. c. 260, § 2A (verified verbatim): 'Actions of tort, actions of contract to recover for personal injuries, and actions of replevin, shall be commenced only within three years next after the cause of action accrues.' This 3-year period covers BOTH mold personal-injury and mold property-damage tort claims. For mold/water-intrusion claims arising from construction or design defects, M.G.L. c. 260, § 2B applies: 3 years from accrual, subject to an absolute 6-YEAR STATUTE OF REPOSE running from the earlier of the improvement's opening to use or substantial completion plus owner occupancy (with a parallel four-trigger rule for public-agency projects). The § 2B repose period is the practical killer for latent water-intrusion/mold construction claims in Massachusetts.
Insurance treatment of mold
UNVERIFIED. No Massachusetts Division of Insurance bulletin, regulation, or M.G.L. c. 175 provision addressing mold coverage caps or exclusions was located from a primary source. The Division of Insurance homeowners consumer page could not be retrieved. No Massachusetts statute mandating or prohibiting mold coverage was found.
Leading cases
Boston Housing Authority v. Hemingway, 363 Mass. 184 (1973) — foundational implied warranty of habitability case (verified); not itself a mold case, but the doctrinal vehicle for mold habitability claims. No Massachusetts appellate decision squarely on mold personal-injury causation or mold insurance coverage was verified this session — see unverified_items.