I Had a Water Leak — What Do I Do Right Now?

Water is pouring into your home. Maybe a pipe burst. Maybe the water heater failed. Maybe you came back from vacation to a soaked floor and a smell you cannot identify. Whatever happened, you need to act fast. The decisions made in the next few hours will determine how much damage occurs, whether mold grows, and whether the insurance claim succeeds or gets denied.

This guide explains what to do, in order, and what a standard homeowner’s policy covers — and what it does not.

Step 1: Stop the Water

Find the source and shut it off. If a supply line burst, turn off the main water shutoff valve. If you cannot locate the source, shut off the main anyway. If it is a roof leak during an active storm, you cannot stop it — move to containment (buckets, tarps) and skip to Step 2.

Know where your main shutoff is before an emergency. Most homes have it near the front hose bib or at the meter box. If you are in a condo, your unit shutoff may be under the kitchen sink or in a utility closet.

Step 2: Call a Water Mitigation Company

This is your first phone call — not the insurance company. A mitigation company (also called a water extraction or emergency services company) will extract standing water, set up industrial dehumidifiers and air movers, and monitor moisture levels until materials reach acceptable dryness. This is called mitigation — your contractual duty to prevent further damage.

Step 3: Document Everything Before Cleanup

Before anyone moves a single item or rips out a single piece of drywall, document the scene:

• Photographs and video. Shoot wide-angle photos of every affected room. Then close-ups of water lines on walls, damaged flooring, affected contents. Video a walkthrough narrating what you see.
• The source. Photograph the failed pipe, appliance, or point of entry. If the plumber replaces the failed component, keep the old part. Put it in a bag and label it.
• Affected contents. Photograph damaged furniture, electronics, clothing, documents. Do not throw anything away yet.
• Moisture readings. Your mitigation company should take initial moisture readings with a meter and document them in their report.

Step 4: Call Your Insurance Company

Now call your insurer to report the claim. You have already started mitigation — good. Your policy requires you to protect the property from further damage (this is your duty to mitigate). You do not need the insurer’s permission to begin emergency mitigation. In fact, if you wait for their permission and mold grows, they will blame you for the additional damage.

When you call, state the facts simply: what happened, when you discovered it, what you have done so far. Do not speculate about causes. Do not volunteer that the pipe “might have been old.” Just report what you found.

What Is Covered: Sudden and Accidental vs. Gradual

This is the central coverage question for every water leak claim. A standard HO-3 covers direct physical loss on an open-perils basis for the dwelling, and lists sudden and accidental discharge or overflow of water from a plumbing system, appliance, or household fixture as a named peril for personal property. What carriers fight over is whether the leak was sudden or gradual— water that has been seeping for weeks or months and is barred by the policy’s seepage exclusion. The recent California decision on this fight is discussed in our article on the continuous-or-repeated seepage exclusion.

This distinction matters enormously:

• Covered: A supply line behind your washing machine bursts while you are at work. You come home to two inches of water. This is sudden and accidental.
• Covered: Your water heater tank fails catastrophically overnight. Sudden and accidental.
• Disputed:A slow leak under your slab has been going for an unknown period. The insurer will argue this is gradual. But the “resulting damage” doctrine may still provide coverage for the consequences.
• Typically excluded: A dripping faucet you ignored for six months that eventually rotted the vanity cabinet. That is maintenance neglect.

The “Resulting Damage” Doctrine

This is one of the most important concepts in water damage claims. Even when the cause is excluded (like gradual seepage), the resulting damageto other property may still be covered. California courts have held that the “resulting loss” provision in standard policies means the insurer must pay for the downstream consequences of an excluded peril, even though it need not pay to repair the excluded condition itself.

Example: A slab leak was gradual (excluded). But the resulting damage to hardwood floors, baseboards, and drywall may be covered — because those items were damaged by the water, and water damage is a covered peril. The insurer does not have to pay to fix the pipe itself, but it must pay for what the water damaged. This intersects with California's efficient proximate cause doctrine (Sabella v. Wisler (1963) 59 Cal.2d 21; Garvey v. State Farm Fire & Casualty Co. (1989) 48 Cal.3d 395). For a deeper discussion, see our guide on water damage claims and the article on efficient proximate cause.

The Mold Risk: Why Speed Matters

Mold spores are everywhere — in the air, on surfaces, in dust. They are harmless until they find moisture and an organic food source (drywall paper, wood, carpet backing). Once conditions are right, the EPA documents that mold colonization can begin within 24 to 48 hours; visible colonies typically appear a day or two after that, and once growth is established the problem expands quickly. For the underlying science, see our companion articles on the EPA mold remediation guide and the VTT mold growth research.

Most California homeowner policies either exclude mold entirely or cap coverage at $5,000 to $10,000. If your water loss turns into a mold claim, you may face remediation costs of $20,000 to $100,000 with minimal coverage. The solution is aggressive, immediate drying. Get air movers and dehumidifiers running within hours, not days.

What NOT to Do Before the Adjuster Arrives

There is a tension here. You must mitigate (extract water, begin drying) — but you should not demolish or discard evidence before the adjuster inspects. Here is where to draw the line:

• Do: Extract standing water. Set up drying equipment. Remove saturated contents to a dry area. Cover damaged areas if there is ongoing risk (e.g., tarp a hole).
• Do not: Rip out drywall before the adjuster sees it (unless your mitigation company documents mold growth requiring immediate removal for health reasons).
• Do not: Throw away damaged items. Set them aside, photograph them, and wait for the adjuster to inspect or authorize disposal.
• Do not: Make permanent repairs. Temporary emergency repairs are fine. Permanent work before the adjuster inspects invites a denial.
• Do not: Clean up all evidence of the water line. The high-water mark on walls proves the extent of the loss. Let the adjuster see it first.

Water Extraction and Drying: What to Expect

Professional water mitigation follows the IICRC S500 standard. Here is the typical process:

1. Extract standing water using truck-mounted or portable extraction units. The faster water is removed, the less it penetrates into subfloors and wall cavities.
2. Remove saturated materials that cannot be dried in place — carpet pad (almost always discarded), insulation, and sometimes carpet depending on contamination category.
3. Set drying equipment. Industrial air movers (not regular fans) direct airflow across wet surfaces. Commercial dehumidifiers pull moisture from the air. The combination creates a drying chamber effect.
4. Monitor daily. A proper mitigation company checks moisture levels daily with penetrating and non-penetrating meters and adjusts equipment placement as needed.
5. Document drying to goal. Materials must reach acceptable moisture content before equipment is removed. This typically takes 3 to 5 days for a moderate loss.

Who Pays for Mitigation?

Your insurance policy covers reasonable mitigation costs as part of the claim. This is not a separate coverage — it is part of the loss. The insurer may argue specific line items are excessive, but they cannot deny mitigation as a category. Your duty to mitigate is in the policy. The cost of fulfilling that duty is their obligation.

If the insurer later denies the underlying claim (arguing the water damage is not covered), they may also refuse to pay mitigation. This is often wrong — if you had a reasonable belief the loss was covered and acted in good faith to mitigate, the insurer should pay those costs regardless. Keep all mitigation invoices.

Common Insurer Tactics on Water Leak Claims

• “That’s a maintenance issue.” The insurer argues the leak was gradual and therefore excluded. Challenge this: demand they prove the leak was ongoing. If you had no notice of the leak before discovery, it was sudden from your perspective.
• “We only owe for the room where the pipe failed.” Water travels. It wicks up drywall. It migrates through subfloor. If moisture readings show damage in adjacent rooms, those rooms are part of the loss.
• “We don’t owe for the tear-out.”To dry wall cavities and repair water-damaged materials, you often must remove drywall, flooring, and baseboards. Demolition and removal of damaged materials are part of the covered repair — not separate “extra” costs.
• “Mold is excluded.” Even if mold coverage is capped, the insurer still owes for the water damage that caused the mold. And if timely mitigation would have prevented the mold, but the insurer delayed the claim, the insurer may owe for mold remediation as a consequence of its own delay.

Your Documentation Checklist

1. Photos and video of all affected areas before any cleanup begins
2. Photos of the source of the leak (failed pipe, appliance, fixture)
3. The failed component itself — keep it in a bag
4. Mitigation company’s moisture mapping and daily readings
5. Mitigation company’s invoice and scope of work
6. Plumber’s report identifying the cause of the failure
7. A written timeline: when you discovered the leak, what you did, who you called, when
8. All communications with the insurer — dates, names, what was said
9. Receipts for any emergency expenses (hotel if displaced, meals, supplies)

When to Get Help

Most straightforward water leak claims — a burst supply line, a failed water heater — resolve without major disputes if mitigation happens quickly and the documentation is solid. But if the insurer denies the claim, calls it “gradual,” or dramatically underpays the repair estimate, professional help may be needed. A public adjuster can re-scope the damage and negotiate with the carrier. For coverage denials or bad-faith delay, consult an attorney. The first 72 hours are the most critical — act fast, document everything, and do not let the insurer’s delay become a mold problem.

Written by Leland Coontz III, Licensed Public Adjuster, CA License #2B53445.