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Who Pays for Mold in a Condo or HOA?

By the moldremovalorangecounty.net editorial team · Published 2026-08-10 · Updated 2026-08-10

Condo mold disputes stall on one question: whose problem is it? California actually answers that question in statute — with defaults almost nobody in the argument has read, and one override that beats them all.

The answer up front

Unless the development's recorded declaration says otherwise, Civil Code §4775 sets the defaults: the association repairs, replaces, and maintains the common area; the owner does the same for their own unit; and exclusive-use common area — balconies, patios, and similar spaces assigned to one unit — splits the duty: the owner maintains it, the association repairs and replaces it. The statute was amended effective 2025, so read the current text, not an old summary — and read your CC&Rs first, because every one of those defaults yields to them.

Why mold cases are the hard cases

Mold follows water, and water ignores property lines. The growth on your bedroom wall may trace to a roof assembly (common area), a neighbor's supply line (their unit), a shared plumbing chase (usually common area), or your own shower (your unit) — and the repair duty follows the source and the assemblies the water crossed, not where the stain happens to show. That is why the inspection finding matters legally, not just practically: it locates the moisture path, and the moisture path locates the duty.

The common scenarios

• Upstairs unit leaks into yours. Typically a three-party matter: the source owner, you, and the association for any common-area assemblies in between. Insurance carriers often sort the costs behind the scenes; your job is notice and documentation.
• Roof or exterior wall leak. Envelope assemblies are classic common area — the association's repair, with your unit's interior damage negotiated alongside.
• Balcony or patio waterproofing failure. The split duty in action, and the place CC&Rs most often override the default. This is the scenario where reading the declaration pays for itself.
• Your own fixture or supply line. Yours — though water that traveled into common assemblies still involves the association's side of the wall.

The practical sequence

Put the association on written notice early, with photos and dates — duty arguments come later, but notice starts every clock. Interior work in your own unit can usually proceed without waiting; anything opening shared or structural assemblies needs the association in the loop. Keep every invoice and the verifier's report if remediation happens while allocation is unresolved: growth keeps its own schedule, and cost can be argued afterward. For disputes that harden, Davis-Stirling has its own dispute-resolution machinery, and an HOA attorney reads CC&Rs for a living.

This page explains how California's rules generally work and is not legal advice. Statutes change and every situation is different — for a dispute over habitability, an HOA's repair duty, or an insurance claim, speak to an attorney or a fair-housing counselor.