Here's a question Bay Area renters shouldn't have to ask: Is it normal for mold to keep growing in your kid's bedroom even after your landlord spent real money to fix the problem?
The answer is no. But for tenants in the East Bay's century-old housing stock, it's an increasingly common nightmare — and one that highlights a much bigger issue with the region's aging infrastructure.
Consider a scenario playing out right now in Oakland: a family in a roughly 100-year-old rental discovers mold behind their son's bed. The landlord, to his credit, acts fast — brings in a contractor, patches a crack in the exterior stucco, rips out the interior lath and plaster, seals everything up. Problem solved, right? Eighteen months later, a significant layer of mold is back. The family has been running a dehumidifier 24/7, draining a quart of water every few days. The room still feels damp. And their kid has been sleeping in it the whole time.
As one local put it bluntly: "This is not normal. Something is leaking in that wall."
The likely culprit? The original contractor may have only addressed one entry point for moisture while ignoring deeper structural issues — deteriorating waterproofing near the foundation, additional stucco cracks, or even roof problems. A Bay Area property manager who's seen this pattern across the region pointed to a common issue: ground-level moisture wicking up through foundations in perpetually shaded areas, essentially turning old walls into sponges.
One East Bay parent who went through a similar ordeal in Marin shared that they ultimately had to move, after racking up enormous PG&E bills running dehumidifiers and watching their young child develop persistent respiratory symptoms that, in hindsight, were almost certainly mold-related.
This is where the fiscal reality gets uncomfortable. The Bay Area's housing crisis means tenants can't easily walk away from affordable rentals, and landlords — even well-intentioned ones — often can't afford the full-scale remediation these old homes require. Meanwhile, city building departments are more focused on permitting new ADUs than ensuring existing housing is actually safe to live in.
The bottom line: if you're renting in an older East Bay home and dealing with recurring mold, don't accept a patch job. Push for a comprehensive moisture investigation. Get your kids out of affected rooms immediately. And if the wall feels even slightly softer than dry areas when you press on it, there's still water behind it — no dehumidifier is going to fix that.
Government can't build its way out of a housing crisis if it won't even hold the line on making existing homes livable.
