Why no hot water breaks the habitability standard
Yes. No hot water is a habitability violation in California when the landlord fails to fix it, because state law requires rentals to have hot and cold running water. A home without working hot water is not considered fit to live in.
California's habitability standard (Civil Code Section 1941.1) lists hot and cold running water among the basics every rental must have. Losing hot water — from a broken water heater or a plumbing failure — is a serious problem, especially when it continues after you report it.
Because hot water affects bathing, cleaning, and everyday health, an unrepaired loss of it can breach the implied warranty of habitability, the promise that your home will be fit to live in. What usually matters is how long the outage lasts and whether the landlord acted after being told. If you have been left without hot water and your landlord will not act, a free, confidential review can explain your options.
This is general information about California tenant rights, not legal advice. Every situation is different.