Responsibility for condo mold follows the water source: in-unit systems are usually the owner's problem, common elements are usually the association's — and your CC&Rs decide the gray zones. California's Davis-Stirling Act sets the general framework for common interest developments, but the practical answers live in your community's governing documents and, above all, in the evidence of where the water actually came from. In condo disputes, the moisture map is the case.
General information for San Diego condo owners, not legal advice. CC&Rs vary widely — read yours, and involve an attorney for contested losses.
The rule-of-thumb responsibility table
| Water source | Typically responsible |
|---|---|
| Supply line, angle stop, fixture inside your unit | Owner |
| Your washer, dishwasher, water heater | Owner |
| Fan-coil / AC condensate line serving only your unit | Owner (usually) |
| Shared plumbing riser or drain stack between units | HOA |
| Roof, exterior walls, structural slab | HOA |
| Windows and sliding doors | Varies — check CC&Rs (often HOA frame/exterior, owner glass) |
| Balcony and walkway waterproofing | Usually HOA, sometimes shared — check CC&Rs |
| Neighbor's overflow or in-unit failure | That neighbor (their insurer) |
Two caveats. First, "responsible for the source" and "responsible for resulting damage inside your unit" can be different questions — many CC&Rs make owners responsible for interior finishes regardless of source, which is exactly what HO-6 insurance exists for. Second, an HOA that knew about a common-element problem and deferred it (the leaking roof on last year's meeting minutes) carries a different exposure than one hit by a sudden failure.
Why the source is never where the stain is
In multi-story buildings, water travels: down pipe chases, along floor slabs, across ceiling cavities. A stain on your bedroom ceiling can originate from a riser two floors up; a wet wall base can come from a walkway drain ten feet away. This is the defining feature of condo mold — and the reason the first call should be for moisture mapping, not demolition. Meters and thermal imaging trace the wet path to its origin and document it with readings and photos. Done before repairs, that documentation answers the only question that matters: whose component failed? Done after repairs, the evidence is gone and the dispute becomes opinion against opinion.
The owner's playbook
- Report in writing to the HOA/manager immediately — their duty clock starts at notice.
- Mitigate what's yours: stop in-unit sources, move belongings, allow drying. Don't wait for the HOA to act before protecting your interior; policies require mitigation. The first day matters most — see what to do in the first 24 hours.
- Get independent moisture mapping before anyone patches anything.
- Notify your HO-6 insurer even if you believe it's the HOA's event — coverage layering gets sorted later, late notice doesn't.
- Insist on a real remediation scope — containment, removal, verification — not paint. Our mold remediation page shows what that looks like; insurance specifics are covered in our California mold insurance guide.
Where this plays out in San Diego
Every condo-dense neighborhood generates these cases, each with its signature failure: Downtown's 2000s towers (risers entering failure years, fan-coil condensate), Mission Valley's 1970s–80s complexes (original risers and walkway decks), Solana Beach's bluff-top buildings (five decades of salt air on windows and decks), and Coronado Shores (ocean-spray exposure on high-rise envelopes). The building era predicts the failure; the moisture map assigns it.
Bottom line
Don't start a condo mold case by arguing — start it by documenting. Written notice to the HOA, independent moisture mapping before repairs, early insurer notice, and a verifiable remediation scope resolve most disputes before they harden. The owners who lose these fights are almost always the ones whose evidence was painted over in week one.