Earthquake Prep Checklist for LA Homeowners: 6 Steps That Matter
It has been thirty years since the Northridge earthquake leveled apartment buildings in the San Fernando Valley and showed Los Angeles homeowners exactly which kinds of houses survive a major shake and which ones don't. Most LA homes built before 1980 are still standing in roughly the same configuration they were in '94 — and the U.S. Geological Survey now puts the probability of an M6.7+ earthquake on a San Andreas Fault segment in the next thirty years at about 60%. This checklist walks the six steps that actually move the needle.
Quick answer
The earthquake prep that matters in LA, in order: (1) strap the water heater — required by CA Health & Safety Code §19211; (2) bolt the foundation and brace cripple walls on pre-1978 homes; (3) retrofit a soft-story tuck-under garage (CRMP grant covers up to $3,000); (4) brace or remove unreinforced brick chimneys; (5) anchor furniture, TVs, and cabinet latches — cheapest step, saves the most lives per FEMA data; (6) build a 72-hour kit and a block-level plan.
LA's earthquake reality (and why most homes aren't ready)
The Northridge earthquake hit at 4:31 AM on January 17, 1994. It measured M6.7. It killed 57 people, damaged about 82,000 buildings, and caused roughly $20 billion in losses. The fault that ruptured was a previously unmapped blind thrust under the San Fernando Valley — not the San Andreas. Thirty years later, the lesson most homeowners remember is the wrong one. The real lesson is that LA sits inside a network of faults, several still unmapped, and the next damaging quake will probably come from one we haven't named yet.
The U.S. Geological Survey's UCERF3 forecast puts the probability of an M6.7+ event on a San Andreas Fault segment within 30 years at about 60%. Add the blind-thrust and Puente Hills systems beneath the basin and the cumulative probability of some M6.7+ shake within commuting distance of downtown LA is substantially higher.
The condition of the housing stock is the other half of the picture. LA County has more than 80,000 pre-1980 soft-story buildings — homes and small multi-family structures with tuck-under garages or open carports under the living space. Most are not retrofitted. The City of LA's 2015 Mandatory Soft-Story Ordinance compels retrofits on certain apartment buildings, but single-family homes are not covered. The pre-1978 foundations on most of those houses also lack the bolts that tie the wood-frame structure to the concrete below — which means in a strong shake, the house can slide off the foundation. For service details, see the earthquake-prep services hub.
Step 1: anchor the water heater (this is the LAW, not optional)
This is the easiest, cheapest, most-skipped step in California earthquake prep — and it is required by state law. California Health & Safety Code §19211 requires that residential water heaters be braced, anchored, or strapped to resist falling or horizontal displacement during an earthquake. Civil Code §1102 disclosure statutes require strapping to be in place at the time of a home sale.
The strap configuration matters. State guidance specifies two straps: one in the upper third of the tank, one in the lower third (above the controls). Each strap has to be lag-bolted into a stud or block. Plumber's tape is not earthquake strapping. A single belt around the middle is not earthquake strapping. The straps have to be on the structural side — top and bottom — because a half-strapped tank pivots when the floor moves.
The reason this is the law: a 50-gallon water heater holds about 400 pounds of water and is connected to a gas line. In a strong shake, an unstrapped tank topples, breaks the gas line on the way down, and either floods or ignites the house. The 1971 Sylmar and 1994 Northridge earthquakes both produced clusters of post-quake fires traced to toppled gas water heaters.
Cost: a pro typically charges $80 to $200 to install a proper two-strap kit and re-anchor the gas flex line. The DIY version is around $30 in hardware and 30 minutes for anyone comfortable with a stud finder. The full statute text lives at the California Legislative Information site.
Step 2: bolt the foundation + reinforce cripple walls
Homes built in LA before 1978 typically lack sill-plate anchor bolts — the bolts that connect the wood mudsill of the house to the concrete foundation beneath it. In a moderate-to-strong earthquake, an unbolted house doesn't crack the foundation; it slides sideways off the foundation and lands on its utility connections. The repair after that kind of failure runs into six figures. The retrofit that prevents it runs a small fraction.
The retrofit has two parts. First, foundation anchor bolts: holes drilled through the existing sill plate into the concrete foundation at engineered spacing (commonly 4–6 feet on center, closer at corners), with anchor bolts epoxied or expansion-set in place. Second, cripple-wall bracing: cripple walls are the short knee-walls — usually 2 to 4 feet tall — between the foundation and the first floor in raised-foundation homes. They're framed with 2x4s and almost always left unsheathed. The fix is structural plywood shear panels on a prescribed nailing pattern.
Cost varies by house size and crawl-space access. A typical bolt-and-brace retrofit on a single-story LA bungalow runs $1,500 to $4,000. Two-story homes run higher. This work is in licensed-contractor territory — it's a structural retrofit and requires a permit. The California Residential Mitigation Program offsets up to $3,000 of the cost for qualifying homes. One more note: the structural engineer's report is the part most homeowners try to skip. Don't. The engineering stamp is what gets the permit signed off and the CRMP grant approved.
Step 3: soft-story retrofit (if you have a tuck-under garage)
A "soft-story" home is one where the ground floor has significantly less lateral resistance than the floor above — almost always because the front of the ground floor is an open garage door instead of a wall. In LA that pattern shows up in two big waves: the 1920s–40s bungalow courts with carports tucked under second-floor units, and the 1960s–70s split-level and dingbat-style homes with garages under the main living space. In Northridge, soft-story buildings collapsed at rates an order of magnitude higher than equivalent fully-walled houses on the same block.
The retrofit options for a single-family tuck-under are typically (1) a steel moment frame — a welded steel goalpost installed around the garage opening, transferring lateral loads through the steel rather than the missing wall, or (2) a plywood shear-wall system with engineered hold-downs at the corners of the opening. Steel frames take up less interior space; plywood is cheaper but needs enough wall on either side of the opening to accept the panel.
Cost runs $3,000 to $8,000 in most LA neighborhoods. The California Residential Mitigation Program (CRMP) — the statewide cousin of the Bay Area's Earthquake Brace + Bolt program — pays up to $3,000 toward qualifying retrofits in eligible ZIP codes. CRMP is statewide, paid as reimbursement after the work is inspected. The screening question is simple: walk out to the curb and count how much wall there is on the ground floor. If the answer is "mostly garage door," Step 3 belongs on your list.
Step 4: brace or remove brick chimneys
Unreinforced masonry chimneys are the single most common fall hazard inside a single-family LA home during an earthquake. The 1910s–40s Craftsman, Tudor, and Spanish Revival homes that line streets in Hancock Park, Mid-Wilshire, Pasadena, and Highland Park were built before the modern reinforced-masonry standard. Their chimneys are stacked brick with lime mortar and no internal steel — and when the ground accelerates laterally, they crack at the roofline and topple, usually inward through the roof.
LA County Fire and CalOES list unreinforced masonry chimneys as a Priority 1 retrofit category. The options:
- Brace in place — steel straps or angle iron at the roofline tying the chimney to the roof framing, plus internal reinforcement where feasible. $1,500–$4,000.
- Remove down to the firebox + cap — take the brick down to roof level, seal the flue, patch the roof. $2,500–$6,000. Eliminates the fall hazard.
- Full rebuild with reinforced masonry or steel flue — $6,000–$15,000+ depending on chimney height and visible detailing.
The wrong move is doing nothing because the chimney "looks fine." Lime-mortar joints look fine for a century until 0.4g of lateral acceleration shows up. If you have a 1910s–40s LA home with an original brick chimney and no record of seismic reinforcement, this is the step to schedule before the next item on your renovation wishlist.
Step 5: secure furniture + breakables (cheap, fast, lives saved)
This is the step that costs the least, takes the least skill, and — per FEMA injury data from Northridge and Loma Prieta — saves more lives and prevents more injuries than steps 1 through 4 combined. Most earthquake injuries inside a structurally sound home are not from the house collapsing; they're from objects inside the house falling, sliding, or shattering.
- Wall-anchor tall furniture. Bookcases, china cabinets, dressers, and any storage piece taller than five feet should be anchored into a stud with an L-bracket or a tip-restraint strap.
- Strap TVs to the wall. A flat-screen on a console will walk and fall. Use a TV safety strap or a wall-mount with a secondary tether. If the TV is already wall-mounted, confirm the mount is into studs — see our TV-mount surface guide.
- Latch cabinets. Push-latches on kitchen and bathroom cabinets keep doors from flying open mid-shake. Around $5 per latch.
- Move heavy or breakable items off high shelves — especially anything above bed height.
- Use museum putty or quake gel under vases, picture frames, and decor on open shelves. Five-dollar fix.
Total cost for a 3-bedroom LA house: $50–$100 DIY over a weekend, or $200–$500 as part of a handyman visit. If your structural retrofits are queued behind a permit timeline or a CRMP application cycle, this is the work you do this weekend.
Step 6: emergency kit + neighborhood plan
The standard reference for a household earthquake kit is FEMA's 72-hour preparedness guidance: enough supplies to be self-sufficient for at least three days without grid power, water service, or open stores. Many LA-area emergency managers now recommend planning for seven days for water specifically.
The minimum kit:
- Water — 1 gallon per person per day, 3 days minimum.
- Food — non-perishable, no-cook options for 3 days. Manual can opener if any of it is canned.
- Lighting — flashlights with fresh batteries plus a backup. Avoid candles (potential gas leaks).
- First aid kit — including a 7-day prescription supply for anyone in the household who needs it.
- Whistle for signaling if trapped.
- Cash in small bills — $100–$200 in $5s and $20s. ATMs and card readers stop working when power goes out.
- Sturdy shoes + work gloves + dust masks kept under the bed. Most post-quake foot injuries happen in the first 60 seconds.
- Backup phone charger — a charged power bank or hand-crank charger.
The neighborhood half of this is what most LA households skip. The LA County Office of Emergency Management runs CERT (Community Emergency Response Team) training that turns neighbors into a coordinated first-response group for the hours before official help arrives. CERT plus a block-level Signal group plus one or two licensed amateur-radio (HAM) operators is a remarkably effective post-event layer when cell service is degraded. For local context, see the LA earthquake-prep page and the Los Angeles services hub. If you've been meaning to schedule a retrofit, start the chat — most LA earthquake-prep specialists are booked 2–4 weeks out, so booking early matters.
Frequently asked
What's the most important earthquake prep step for an LA home?
Strapping the water heater (California Health & Safety Code §19211) and anchoring tall furniture and TVs. Those two steps together cover the most-skipped legal requirement in CA and the single largest source of in-home earthquake injuries per FEMA data — and both can be done in a weekend for under $100 in DIY supplies. Structural retrofits (foundation bolts, soft-story, chimney) come next but take longer to schedule and permit.
Does the CRMP grant pay for my retrofit?
The California Residential Mitigation Program (CRMP) pays up to $3,000 toward qualifying seismic retrofits — primarily soft-story tuck-under retrofits and traditional bolt-and-brace foundation work — in eligible CA ZIP codes. The grant is reimbursement-based: complete the work to the program's engineering standard, get it inspected, and submit for reimbursement. Eligibility resets per grant cycle; the application window opens roughly once a year — check californiaresidentialmitigationprogram.com for the current cycle.
How much does a soft-story retrofit cost in LA?
For a single-family tuck-under garage, $3,000 to $8,000 is typical depending on the retrofit method (steel moment frame vs. plywood shear-wall system) and the width of the garage opening. CRMP can cover up to $3,000 of that for qualifying homes. Multi-family soft-story buildings covered under LA's Mandatory Soft-Story Ordinance run substantially higher and have a different permitting path.
Is water heater strapping required by law in California?
Yes. California Health & Safety Code §19211 requires residential water heaters to be braced, anchored, or strapped against earthquake displacement. State guidance specifies two straps — upper third and lower third of the tank — lag-bolted into studs or blocking. Civil Code §1102 disclosure statutes require strapping to be in place at the time of a home sale, which makes it the most commonly flagged item in pre-sale home inspections.
How do I know if my home needs a foundation bolt retrofit?
Two screening questions. (1) Was the house built before 1978? Pre-1978 LA homes typically lack sill-plate anchor bolts. (2) Is the foundation a raised perimeter foundation (not a slab)? Raised foundations with cripple walls are the highest-risk configuration. If both answers are yes, schedule a structural inspection — a licensed contractor or structural engineer can confirm in 15 minutes whether the sill plate is bolted by accessing the crawl space.
What's in a 72-hour earthquake emergency kit?
Per FEMA: 1 gallon of water per person per day (× 3 days minimum), non-perishable no-cook food (× 3 days), flashlight + spare batteries, first-aid kit, 7-day prescription medication supply, whistle, $100–$200 cash in small bills, sturdy shoes + work gloves + dust masks stored next to the bed, and a charged backup phone battery. Many LA emergency managers now recommend planning for 7 days of water specifically, since water service is the slowest utility to restore after a major event.
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