california health and safety code 17920.3 lists the conditions that make a California rental legally “substandard,” grouped in subdivisions (a) through (o). If a letter or report cites california health and safety code 17920.3, someone is saying your home has one of those problems, such as no heat, mold, or pests.
What California Health and Safety Code 17920.3 Actually Says
The section starts with one key test. A problem only counts if it is serious. The law says it must endanger the “life, limb, health, property, safety, or welfare” of the occupants or the public. As a result, a small scuff on a wall does not count. However, a broken heater or a sagging ceiling typically does.
Once that test is met, california health and safety code 17920.3 says the building “shall be deemed” substandard. For example, subdivision (a) covers inadequate sanitation. That includes a missing or broken toilet, sink, or shower. It also includes no hot and cold running water, no adequate heating, dampness, pests, visible mold, and poor garbage facilities.
The rest of the list reaches structural hazards, wiring, plumbing, weather protection, fire hazards, blocked exits, and rooms never meant for living. The table below walks through the main parts. Always check the exact wording of california health and safety code 17920.3 in the official statute text.
| Provision | Exact rule | Section |
|---|---|---|
| Inadequate sanitation | Missing or improper toilet, sink, tub or shower, or kitchen sink; no hot and cold running water; no adequate heating; poor ventilation or light; dampness; insects, vermin, or rodents; visible mold; general dilapidation; no sewage connection; poor garbage facilities | 17920.3(a) |
| Structural hazards | Deteriorated foundations; defective flooring or floor supports; walls, ceilings, or roofs that sag, split, or buckle; chimneys that lean, bulge, or settle | 17920.3(b) |
| Nuisance | Any nuisance | 17920.3(c) |
| Wiring, plumbing, mechanical | Unsafe systems, unless they met the law when installed and still work safely | 17920.3(d), (e), (f) |
| Faulty weather protection | Crumbling plaster; failed waterproofing; broken windows or doors; broken, rotted, or buckled wall or roof coverings | 17920.3(g) |
| Fire and debris hazards | Conditions the fire chief finds could cause fire or explosion; junk, garbage, stagnant water, or rat harborages that create hazards | 17920.3(h), (j) |
| Exits, fire safety, and use | Missing required exits or fire protection; spaces used for living, sleeping, or cooking that were not designed for it | 17920.3(l), (m), (n) |
Who California Health and Safety Code 17920.3 Covers (and Who It Does Not)
The law applies to “any building or portion thereof.” That includes any dwelling unit, guestroom, or suite of rooms, plus the premises around it. In most cases, that means apartments, houses, duplexes, rented condos, and hotel rooms used as homes. The focus is the condition of the building, not the type of lease you signed.
There are limits. Old wiring, plumbing, and mechanical systems are not automatically substandard. They are excused if they met the rules when installed and still work safely. Also, a room that is slightly too small does not count on its own if it was legal when built. As a result, california health and safety code 17920.3 targets real danger, not just outdated design.
Local rules can add more. Many California cities and counties run their own code enforcement and housing inspection programs. For example, some cities have rental inspection or rent control rules with extra repair steps. Ask your city or county code enforcement office how its local rules work alongside california health and safety code 17920.3.
What Your Landlord Must Do Under This Law
california health and safety code 17920.3 is a list, not a repair order by itself. However, it is the list local building and health inspectors use. When an inspector finds a listed condition, the local agency can issue a notice. That notice typically requires your landlord to fix the problem.
In most cases, the landlord must make repairs by the date in that notice. Other California laws also point back to this list. For example, some California Civil Code rules on habitability and rent refer to units cited as substandard. The exact deadlines and penalties come from those laws and the agency’s notice. Confirm them with the office that issued it.
A landlord also should not punish you for reporting problems. California law protects tenants who complain to an inspector. If you get a rent increase or eviction notice right after a complaint, talk to legal aid quickly. Your rights under california health and safety code 17920.3 do not disappear because you spoke up.
What You Can Do When It Is Broken
Start by writing to your landlord. Describe the problem, when it started, and ask for a repair. Keep a copy. Take dated photos and videos. For example, photograph mold, water stains, droppings, or a broken heater. As a result, you build a clear record that is hard to argue with.
If the landlord does not act, call your city or county code enforcement or health department. Ask for an inspection. Under california health and safety code 17920.3, pests and mold must be confirmed by a health officer or code enforcement officer. So an official visit matters. Ask for a copy of the inspection report.
Do not stop paying rent on your own without advice. Repair-and-deduct and rent withholding have strict rules in other laws. If you face an eviction, contact a local legal-aid office or tenant attorney right away. Your county superior court’s self-help center can also explain the steps. Many tenants who document problems under california health and safety code 17920.3 can push for repairs.
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Frequently Asked Questions
My landlord’s letter cites california health and safety code 17920.3. What does that mean?
It usually means someone found, or claims, a condition on the substandard list. Read the letter for the specific problem and any dates. If it asks you to move out, contact legal aid before you respond.
Is any mold a violation?
No. Under california health and safety code 17920.3, the law covers visible mold growth confirmed by a health officer or code enforcement officer. It excludes minor mold on surfaces that normally get wet, like a shower. Heavy or spreading mold is different, so request an inspection.
Can I withhold rent if my unit is substandard?
Maybe, but not under california health and safety code 17920.3 alone. Withholding rules come from other California laws with strict steps. Check with a local legal-aid office before you hold back any rent.
Protect your stuff while you sort this out
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Find Your State’s Exact Rules
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Sources & How to Verify
The rules on this page are drawn from official government and legal-aid sources. Tenant law changes, so always confirm the exact rule with your state’s statute or a local legal-aid office.
- HUD: hud.gov — federal renter protections and fair housing
- Legal Services Corporation: lsc.gov — find free legal aid in your state
- Cornell Legal Information Institute: law.cornell.edu/wex — plain-English legal definitions
- Your state statute & court self-help portal: search “[your state] landlord tenant act” and “[your state] court self-help eviction” for the exact law and forms
Content last reviewed September 2026. If you notice outdated information, please contact us.
California Renter Guides
- California Eviction Process
- California Tenant Rights
- California Security Deposit Law
- California Rent Increase Laws
- California Repairs and Habitability
- Breaking a Lease in California
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Informational only — not legal advice. Tenant Rights Info is an independent educational resource, not a law firm, and this page does not provide legal advice. Landlord-tenant law varies by state and city and changes over time, so always verify the exact rule with your state’s statute, your local court’s self-help portal, or a legal-aid office. For urgent situations like an active eviction, contact a local legal-aid office or a licensed tenant attorney in your state right away.