California Declares a State of Emergency Ahead of El Niño: What Bay Area Homeowners Should Check Now
San Francisco Bay Area
September 21, 2026
California has declared a state of emergency ahead of what state officials describe as a potentially historic El Niño season.
According to ABC7, the declaration is intended to help state agencies prepare roads, critical infrastructure, emergency supplies, and communities for possible flooding, landslides, coastal impacts, and powerful winter storms. Forecasters expect El Niño conditions to strengthen in the months ahead. (abc7news.com)
For Bay Area homeowners, the important question is not simply whether a major storm arrives.
The better question is:
What happens at your property when the water arrives?
A home with marginal drainage, deteriorated foundations, poor grading, or an already damp crawl space can experience problems long before water reaches the living area.
Why El Niño Matters to Bay Area Homes
El Niño does not damage every property in the same way. The effect depends on the individual site:
- The slope of the lot;
- Soil type;
- Foundation condition;
- Downspout locations;
- Drainage systems;
- Retaining walls;
- Crawl-space ventilation;
- Hardscape elevations; and
- The condition of previous repairs.
One house may remain relatively dry while a nearby property develops standing water, foundation movement, or slope-related problems.
That is why general weather warnings are only the beginning. Homeowners need to understand how their own property receives, redirects, and releases water.
Our previous guide explains how drainage, soil, foundation movement, and seismic performance interact during a strong El Niño season:
The Main Property Conditions to Check
1. Water flowing toward the house
Exterior soil, concrete, patios, walkways, or driveways should not direct large amounts of water toward the foundation.
Look for:
- Negative slope toward the house;
- Water pooling beside foundation walls;
- Soil or concrete raised against siding or stucco;
- Downspouts discharging at the base of the walls; and
- Water flowing toward crawl-space doors or basement entries.
A drainage problem does not need to produce visible flooding every time it rains. Repeated saturation can still affect soil, concrete, framing, and crawl-space conditions.
2. Downspouts that discharge too close to the foundation
Roof water contains a significant amount of runoff during intense storms. If downspouts discharge directly beside the foundation, that water can saturate the soil immediately next to the structure.
Check whether downspouts:
- Connect to solid piping;
- Discharge away from the foundation;
- Connect to a functioning drainage system;
- Have accessible cleanouts; and
- Discharge legally and safely.
A downspout extension lying on the ground may help temporarily, but it is not automatically a complete drainage solution.
3. Standing water or damp soil under the house
A crawl space that smells musty, contains standing water, or remains damp after rainfall deserves attention.
Warning signs include:
- Standing water;
- Mud or unusually damp soil;
- White mineral deposits on concrete;
- Rusted nails or hardware;
- Corroded pipes;
- Moisture staining;
- Mold-like or mildew-like material;
- Wood deterioration; and
- Water marks on foundation walls.
Not every substance in a crawl space can be identified visually. Mold, mildew, fungus, pests, and other conditions may require separate testing. However, visible moisture and water-entry conditions can still indicate that the drainage system is not functioning as intended.
See:
Why Is There Standing Water Under My House?
Why Does My Crawl Space Smell Musty?
4. Retaining walls holding back water
Retaining walls require more than visible structural strength. They also need a way to manage water pressure behind the wall.
Warning signs include:
- A wall leaning outward;
- Cracks or separated joints;
- Bulging;
- Water staining;
- Missing or blocked weep holes;
- Saturated soil behind the wall; and
- Drainage systems that appear incomplete or clogged.
When water has nowhere to go, hydrostatic pressure can increase behind the wall. The problem may involve drainage, soil, wall construction, or a combination of conditions.
See:
Why Is My Retaining Wall Leaning?
5. Foundation deterioration
Repeated moisture exposure can accelerate deterioration in older foundations, especially where concrete quality was poor or where water remains against the foundation for long periods.
Look for:
- Spalling;
- Crumbling concrete;
- Efflorescence;
- Cracks;
- Displaced sections;
- Exposed reinforcing steel;
- Deteriorated foundation caps;
- Gaps below mudsills; and
- Areas that can be disturbed by hand.
Water is not always the only cause. Foundation deterioration may also relate to original materials, soil movement, inadequate drainage, corrosion, settlement, or previous work.
Why Drainage and Seismic Safety Are Connected
Drainage and seismic safety are often treated as separate subjects. At the property level, they interact.
Water can affect:
- Soil strength and stiffness;
- Foundation support;
- Crawl-space conditions;
- Wood framing;
- Fasteners and connectors;
- Cracks and settlement;
- Load paths; and
- The condition of previous seismic retrofit work.
If a foundation moves, cracks, or deteriorates, the structure may not behave as intended during an earthquake.
That does not mean every drainage problem creates an immediate seismic failure. It means the condition should be evaluated as part of the overall system rather than treated as an isolated puddle or crack.
For additional context:
The Real ROI of a Seismic Evaluation: Beyond the Insurance Discount
The Hidden Systems Under Your Home That Free Estimates Ignore
San Leandro Earthquake: Why an M 3.8 Shake Is Another Warning Shot for Bay Area Homeowners
A Drain Board Is Not Automatically a Drainage System
Some below-grade waterproofing products are installed incorrectly or used without a complete drainage path.
A dimpled foundation drain board is generally intended to work as part of a coordinated assembly involving:
- The foundation wall;
- Waterproofing;
- Drainage space;
- Footing drains;
- Filter fabric;
- Drain rock; and
- A functioning discharge path.
Installing a product in the wrong location or terminating it incorrectly can leave water trapped against or within the foundation system.
Read:
When “Waterproofing” Makes Things Worse: Drain Boards Installed on the Wrong Side of the Foundation
The point is simple:
The presence of a drainage product does not prove that the drainage system works.
What Homeowners Can Do Before the Next Major Storm
Before the rainy season intensifies, homeowners can perform a basic visual check.
Outside the home
- Walk the property during or immediately after rain.
- Look for water flowing toward the foundation.
- Check whether downspouts discharge beside the house.
- Look for standing water near walls, steps, patios, and crawl-space entrances.
- Check whether retaining walls show movement.
- Look for soil or hardscape that sits too high against siding or stucco.
Inside the crawl space or basement
- Look for standing water or damp soil.
- Check for efflorescence and spalling.
- Look for rusted fasteners and moisture staining.
- Check for deteriorated posts, beams, mudsills, or foundation caps.
- Look for evidence of previous retrofit work.
- Note whether the work appears complete and accessible.
- Photograph conditions before covering or disturbing anything.
Inside the home
Pay attention to changes such as:
- Doors that suddenly stick;
- Windows that become difficult to operate;
- New cracks;
- Floors that appear more uneven;
- Baseboards separating from floors;
- Sloping or bouncy areas; and
- Changes that become more noticeable after rain.
These signs do not identify the cause by themselves. They indicate that further evaluation may be worthwhile.
See:
Why Do My Doors Suddenly Stick in the Bay Area?
Why Are My Floors Sloping in the Bay Area?
Clay Soil and Seasonal “House Movement” in the Bay Area: What’s Normal?
Be Careful With Quick Fixes and Cheap Quotes
A strong storm often creates a rush for emergency drainage work. That is when homeowners are most likely to accept the first available contractor or a vague solution.
A low price may exclude:
- Proper excavation;
- Drainage fabric;
- Adequate drain rock;
- A functioning discharge location;
- Foundation protection;
- Crawl-space access;
- Structural repairs;
- Permit costs;
- Finish restoration; or
- Coordination with existing systems.
A “drain” that does not have a working outlet is not a complete drainage plan.
A seismic retrofit that does not account for foundation, moisture, framing, and access conditions may also leave important problems unresolved.
Related reading:
Why Handyman Pricing Articles Mislead California Homeowners and Break the Rules
The Hidden Trap of Owner-Builder and Unlicensed Work in Bay Area Seismic and Foundation Projects
Does EBB Vet and Regulate Contractors? Here’s the Truth
The Real Cost of a Cheap Seismic Retrofit and Why It Can Hurt You Twice
When a Professional Evaluation Makes Sense
A professional evaluation may be appropriate when:
- Water enters the crawl space during storms;
- The foundation is deteriorating;
- Drainage work was previously installed but its design is unclear;
- The home has a history of settlement or movement;
- Existing seismic retrofit work needs to be checked;
- A retaining wall is leaning;
- Doors or floors have changed;
- You are planning foundation or drainage work; or
- You are unsure whether several conditions are connected.
A useful evaluation should explain:
- What is visibly present;
- What appears to be causing the condition;
- What remains unknown;
- What should be addressed first;
- Which work can be phased;
- What the likely construction options are; and
- What additional engineering, testing, permits, or specialist services may be required.
At Avant-Garde, our evaluations may include site documentation, crawl-space and foundation review, drainage observations, floor-level measurements, photographs, to-scale drawings, written findings, and itemized construction proposals where appropriate.
Read more:
Is Avant-Garde the Right Contractor for Your Home? The Avant-Garde Dossier
How We Work to Earn, Not Assume, Your Trust
The Hidden Systems Under Your Home That Free Estimates Ignore
Do Not Wait Until the Water Is Already Inside
California’s emergency declaration is a reminder that preparation starts before the storm, not after the crawl space floods.
Homeowners do not need to panic or assume that every property requires a major reconstruction. They do need to understand the conditions that already exist.
Start with the basics:
- Observe how water moves around the property.
- Check downspouts and low areas.
- Look inside the crawl space or basement where safely accessible.
- Document existing cracks, moisture, and previous work.
- Gather permits, plans, inspection reports, and contractor records.
- Have unclear or interconnected conditions evaluated before committing to repairs.
A strong El Niño season may expose weaknesses that ordinary rainfall has allowed homeowners to ignore.
The best time to understand those weaknesses is before the first major storm tests the system.
Related Resources
- El Niño Is Strengthening: What Bay Area Homeowners Should Do About Drainage, Foundations, and Seismic Safety
- When “Waterproofing” Makes Things Worse: Drain Boards Installed on the Wrong Side of the Foundation
- Why Is There Standing Water Under My House?
- Why Does My Crawl Space Smell Musty?
- Why Is My Retaining Wall Leaning?
- Why Do My Doors Suddenly Stick in the Bay Area?
- Why Are My Floors Sloping in the Bay Area?
- Lead, Asbestos, and Silica: Three Health Hazards Homeowners Should Ask About
- Alameda County Ranked Among Least Prepared for Disasters
If you are concerned about drainage, foundation movement, crawl-space moisture, or existing seismic work, Avant-Garde Construction Enterprise provides paid professional evaluations for Bay Area properties.
This article provides general construction information and is not a structural-engineering report, geotechnical report, legal advice, medical advice, or a guarantee of future weather or property performance.
