Southern California homeowners are in a surprisingly strong equity position right now, with underwater mortgages (owing more than a home is worth) becoming increasingly rare. A recent first-quarter 2026 housing snapshot shows Orange County leading the nation among major mortgage markets for the fewest underwater loans—an important signal of price stability across the region.
For homeowners in San Diego and across Southern California, this matters beyond real estate headlines. When equity is strong, people renovate, upgrade, and protect their properties—because the home is an asset worth maintaining. And one of the fastest ways to erase hard-earned equity is preventable water damage from leaks, failed water heaters, sewer backups, or aging drain lines.
Why “Underwater Mortgages” Are So Rare in Southern California Right Now
Who is tracking the data
The figures referenced come from a Cotality report that tracked underwater mortgages in the first quarter of 2026 across the 100 U.S. markets with the most mortgages. The analysis and commentary cited in the original piece were written by business columnist Jonathan Lansner.
What the report measures
An “underwater mortgage” is when the remaining loan balance is higher than the estimated market value of the home. This is a high-risk situation because it can increase defaults when finances tighten—something that contributed to broader housing instability in the mid-2000s and into the Great Recession.
Where Southern California stands
In early 2026, Orange County posted the lowest underwater share among the top 100 U.S. mortgage markets: 39 underwater loans per 10,000 mortgages (about 2,300 loans), up roughly 2% year over year.
Other Southern California markets also ranked near the best in the nation:
Ventura County: 58 per 10,000 (about 1,100 loans), down 0.2% in a year.
San Diego County: 61 per 10,000 (about 4,100 loans), down 2.5% in a year.
Los Angeles County: 106 per 10,000 (about 17,200 loans), up 0.8% in a year.
Inland Empire: 107 per 10,000 (about 11,000 loans), down 0.3% in a year.
When this snapshot applies
These statistics reflect the first quarter of 2026.
Why the region is performing well
Two main forces are helping keep underwater mortgages low: tighter mortgage underwriting standards since the Great Recession and persistently high home prices that support property values.
What Strong Home Equity Means for San Diego Homeowners (And Why Plumbing Still Matters)
Low underwater mortgage rates don’t mean homeowners are risk-free—they mean the average homeowner has something valuable to protect. In San Diego, home values can be resilient, but a single unchecked leak or slab issue can cause tens of thousands of dollars in damage, complicate insurance claims, and undermine resale value.
From a plumber’s perspective, this is the hidden “equity threat” many homeowners overlook: water damage doesn’t just cost money today—it can reduce appraised value tomorrow, delay a sale, or trigger disclosures that affect negotiations.
The Overlooked Link Between Property Value and Plumbing Systems
When homeowners have equity, they’re more likely to remodel kitchens, upgrade bathrooms, install tankless water heaters, or convert garages/ADUs—projects that depend on reliable drain and water lines. But Southern California’s mix of older housing stock, shifting soil, and tree-root intrusion makes preventive plumbing especially important in San Diego.
Even if you’re not selling soon, keeping drains flowing and water heaters reliable helps preserve the “real” value of your home: livability, safety, and damage-free structure. That’s particularly relevant in San Diego neighborhoods with older cast iron drain lines, aging galvanized piping, or high-use short-term rental properties where systems are stressed.
How a Local San Diego Plumber Can Help Protect Equity
When the market shows homeowners are largely above water, it’s a sign many people can refinance, renovate, or plan a future sale with confidence. The practical next step is protecting that value with proactive maintenance and fast response when something goes wrong.
Downtown San Diego Plumber, Drain Cleaning, Water Heater Services helps homeowners and property managers across San Diego handle the plumbing issues that most commonly lead to expensive property damage—like emergency leak repair, sewer and drain cleaning, water heater replacement, and preventive inspections before a remodel or sale.
Local Reality Check: San Diego Homes Face Water Risks Even in “Good” Markets
San Diego’s strong housing position doesn’t stop pinhole leaks, corroded shut-off valves, or surprise water heater failures. And because many San Diego properties are tightly spaced, a leak can quickly impact adjacent units, condos, or multi-family buildings—turning a plumbing issue into a neighbor dispute or HOA headache.
If you own in San Diego, rent out a unit in San Diego, or manage property in San Diego, treating plumbing as a core “asset protection” system is one of the simplest ways to avoid preventable loss—especially when the broader market has given homeowners so much equity to lose.
Actionable Steps Homeowners Can Take This Month
- Find and test your main water shut-off valve now (don’t wait for an emergency) and replace it if it’s seized or corroded.
- Schedule drain cleaning or a camera inspection if you’ve had recurring clogs, slow drains, or sewage odors—these are early warnings of bigger line problems.
- Check the age of your water heater; proactively replace aging units before they leak, especially if the unit is in an interior closet or above finished flooring.
- Fix “small” leaks immediately (toilet runs, dripping faucets, damp cabinets) because slow water damage can lead to mold and costly remediation.
- If you’re remodeling or planning to sell, consider a pre-sale plumbing inspection to avoid last-minute repair demands during escrow.
Frequently Asked Questions
Protect Your Home’s Value Before a Small Leak Becomes a Big Loss
Southern California’s low underwater mortgage rates highlight something important: many homeowners have built real equity. If you’re in San Diego and want to protect your property from costly water damage, proactive drain cleaning, leak detection, and water heater service can prevent the kinds of surprises that erase value quickly.
To schedule service or request an inspection, contact Downtown San Diego Plumber, Drain Cleaning, Water Heater Services.
Credits: This article is a commentary-based rewrite for informational purposes, based on this source. The original column credits business columnist Jonathan Lansner.
