Super El Niño 2026: How Los Angeles Property Owners Can Prevent Foundation, Hillside, and Water Damage
A strong El Niño is developing, and Los Angeles property owners should prepare before the winter storm season arrives.
NOAA’s Climate Prediction Center issued an El Niño Advisory in June 2026, stating that El Niño conditions are present and expected to strengthen into the Northern Hemisphere winter of 2026–27. NOAA also reported a 63% chance of a very strong El Niño during November through January, which would rank among the largest El Niño events in the historical record going back to 1950. (Climate Prediction Center)
Some people call this a “Super El Niño.” That is not an official storm category. El Niño is not a single storm, and it does not guarantee that Los Angeles will have a wet winter. Local rainfall still depends on storm tracks, atmospheric rivers, and the specific weather systems that reach Southern California. NBC Los Angeles notes that there is no formal “super” category and that stronger El Niño events only tilt the odds toward certain weather outcomes; they do not guarantee them. (NBC Los Angeles)
Still, a very strong El Niño matters. It can increase the chances of unusual winter weather patterns, heavier precipitation events, and regional flood risk. For Los Angeles properties, that means the time to prepare is before rain exposes existing weaknesses.
Why El Niño Matters for Los Angeles Properties
Most structural damage from heavy rain does not begin on the day of the storm. It often begins months or years earlier.
A clogged drain.A cracked retaining wall.A poorly sloped yard.A failing waterproofing membrane.A hillside with exposed soil.A foundation crack that keeps widening.A balcony or exterior walkway with hidden water damage.
Heavy rain simply reveals the weakness.
Los Angeles County warns that canyon, hillside, mountain, burn-area, and steep areas are more likely to experience landslides and mudslides, and urges residents to prepare well before storm conditions arrive. (Ready LA County) LA County also recommends clearing debris from storm drains and gutters, keeping sandbags and protective materials available, and moving valuables away from flood-prone areas. (Ready LA County)
For homes and buildings in hillside areas, preparation is even more important. Water adds weight to soil, increases pressure behind retaining walls, weakens slopes, and can push moisture toward foundations and basements. If drainage fails, even a normal rain season can become expensive. During a very strong El Niño winter, that risk can rise.
The Most Common Damage to Watch For
Foundation Movement
Foundation damage can become worse when soil expands, softens, washes out, or drains unevenly around the structure. Watch for new cracks, widening cracks, sloping floors, sticking doors, gaps around windows, or separation between walls and exterior surfaces.
If water is flowing toward the house instead of away from it, the foundation is already under unnecessary stress.
Retaining Wall Pressure
Retaining walls are designed to hold back soil, but they also need proper drainage. When water builds up behind the wall, the pressure increases. Warning signs include leaning, bowing, horizontal cracking, soil pushing through cracks, blocked weep holes, or water stains on the wall face.
LADBS retaining wall plan-check guidance notes that retaining walls may require separate plan check and permits, structural details, design calculations, surface drains, subsurface drains, and verification against sliding and overturning. (LADBS) That is why retaining wall issues should be treated as structural concerns, not cosmetic repairs.
Hillside Instability
Hillside properties face slope movement, erosion, runoff, and drainage problems. Exposed soil, loose fill, blocked slope drains, broken pipes, failed terrace drains, or new cracks after rain should be taken seriously.
LADBS states that grading permits are required for grading work in hillside grading areas, removal and recompaction, backfill, slope repairs, landslide repairs, and other hillside work. (Weather West) In practical terms, hillside repair is rarely just “moving dirt.” It often requires engineering, drainage planning, retaining systems, waterproofing, and careful construction.
Waterproofing Failure
Waterproofing problems often appear as staining, peeling coatings, damp walls, musty odors, efflorescence, moisture at lower walls, or leaks after rain. These problems can affect foundations, basements, crawl spaces, balconies, exterior stairs, retaining walls, and below-grade areas.
Once water enters the structure, damage can spread into framing, reinforcement, connectors, finishes, and soil support systems.
Balcony and Exterior Elevated Element Damage
Apartment buildings and multi-family properties should pay special attention to balconies, decks, exterior walkways, stairs, and landings. LAHD’s Exterior Elevated Elements program states that qualifying apartment buildings must complete required safety inspections by January 1, 2026, and then every six years after, except as otherwise provided. LAHD also states that owners are responsible for maintaining these elements in safe and functional condition. (NBC Los Angeles)
Heavy rain can expose or accelerate hidden waterproofing and structural deterioration.
What Property Owners Should Do Before Heavy Rain
Start with drainage. Clear gutters, downspouts, area drains, driveway drains, catch basins, retaining wall drains, and slope drains. Cities in LA County advise property owners to clean private drains before rain events and remove debris from hillside slope drains. (Monterey Park)
Then walk the property and look for visible warning signs:
Cracks in foundations, walls, slabs, or retaining walls
Water flowing toward the building
Soil pulling away from foundations
Leaning or bowed retaining walls
Blocked drainage outlets
Exposed hillside soil
Soft balcony or walkway surfaces
Staining under exterior decks or stairs
Settlement near driveways or walkways
Moisture at basement or lower-level walls
Take photos before the rainy season. If damage appears later, you will have a record showing what changed.
For hillside and high-value properties, it is smart to schedule a structural review before the first major storm. Prevention is usually less expensive than emergency repair. Once soil is saturated, walls are moving, or water is entering the structure, options can become more limited and more costly.
Why Prevention Matters
Waiting for damage to become obvious is risky.
A small drainage issue can become a foundation problem.A waterproofing failure can become framing damage.A cracked retaining wall can become a slope problem.A hillside runoff issue can become a mudflow or erosion concern.A minor inspection issue can become a city compliance problem.
For Los Angeles property owners, structural prevention is not just about avoiding inconvenience. It can protect safety, property value, insurance position, resale timing, tenant use, and city compliance.
Omega Structural helps Los Angeles property owners prepare for serious rain seasons with engineer-led foundation repair, hillside remediation, retaining wall repair, waterproofing, drainage, balcony-related structural repair, and structural engineering support.
Protect Your Property Before the Storms Arrive
A very strong El Niño does not guarantee disaster. But it is a warning to take existing structural, drainage, waterproofing, and hillside risks seriously.
If your property has cracks, water intrusion, drainage problems, retaining wall movement, hillside instability, balcony concerns, or a prior inspection issue, now is the time to act.
Contact Omega Structural to review your property before storm damage becomes a larger safety, compliance, or cost problem.
