The data

By the numbers

The mold crisis is not a series of isolated complaints. It is a measurable public-health failure — concentrated in aging housing, accelerated by climate, and worsened by absentee corporate ownership.

47%
of US homes built before 1980

Aging stock is the substrate for chronic mold.

2023
the year mold joined the federal inspection checklist

Decades after lead paint was banned in 1978.

44%
of US rentals owned by corporate entities

Studies show poorer maintenance records.

$80B+
in asthma costs, 2008–2013

Roughly half borne by public insurance.

Asthma climbs where housing fails

General adult asthma sits around 8%. In mold-ridden, low-income housing, diagnosed rates rise to nearly half of children.

US adults with asthma (general)~8%
Asthma rate, low-income New Haven neighborhoods23%
Adults with diagnosed asthma at one mold-ridden complex37%
Children with diagnosed asthma at that complex48%

A timeline of inaction

1950s

Studies first connecting mold, housing, and health appear in the medical literature.

1978

The federal government bans lead-based paint in residential buildings. Mold receives no comparable action.

2015

A 301-unit complex is declared uninhabitable because of widespread mold; a class action follows on behalf of nearly 1,000 former tenants.

2018

Investigations reveal the housing department had long given passing grades to buildings with toxic mold.

2020

Corporate entities own at least 44% of US rental housing; the share keeps growing.

2023

Mold finally appears on the federal housing inspection checklist — decades after lead.

Now

Climate-fueled flooding accelerates outbreaks in aging coastal-city housing stock.

Who is accountable

Landlords

Corporate owners treat repairs as a cost to minimize. A spray bottle and fresh paint is not remediation. Real abatement means finding the source of the water, relocating tenants, and tearing into the roof and walls.

City government

Code enforcement is understaffed and rarely follows through. A failed inspection means nothing if no one returns to reinspect — and landlords know it.

Federal regulators

Mold only joined the inspection checklist in 2023. Buildings that receive public funding must be held to decent, safe, and sanitary conditions — and that has to be enforced.