Last updated: October 2026
Floodwater is one of the hardest things a car can go through. Even when it looks fine once the water drains away, the damage is often hidden in the electrics, the engine and the carpets. What you do in the first day matters, both for safety and for what the car is worth afterwards. Here is a step by step guide, from the moment you find the car to the point where you decide whether to repair it, claim it or sell it.
The First 24 Hours
- Do not try to start it. In a Youi article, Rod Lofts of the VACC warns that trying to start a submerged car can cause severe damage through hydraulic lock, which can bend internal engine parts.
- Do not drive it, even if it seems to run. Damage may not be visible yet.
- Call your insurer first, before a mechanic or repairer, if you have comprehensive cover. Flood cover generally needs a comprehensive policy.
- Take photos of the water line inside and outside the car, the carpets and the engine bay.
- If it is an electric or hybrid car, keep it at least 15 metres from buildings and other vehicles and do not charge it. The article cites Fire and Rescue NSW warning that water damaged battery systems can ignite hours, days or even weeks later.
What Floodwater Actually Damages
Modern cars have many electronic control units, and some sit low in the cabin. The VACC explains that water can damage these instantly or start slow corrosion that causes hard to diagnose faults later. Saltwater is the most corrosive. Fresh floodwater often leaves silt and mud behind, which is abrasive and hard to clean out of seat foam, wiring looms and air ducts. Water in the engine or driveline can be very damaging, especially above the manufacturer’s safe wading depth.
This is why a flood car that starts and drives on day two can still develop electrical problems months later, and why buyers treat flood damage so cautiously.
How to Tell How Far the Water Got
If the car was parked when the water came through, you may not know how deep it was. These signs help you and your insurer judge it:
- A tide mark of dirt or debris on the outside of the doors, the wheels or the engine bay
- Damp or muddy carpets, and water sitting in the spare wheel well
- Silt under the seats, in the seat rails or in the door pockets
- A musty smell that does not clear after airing the car
- Condensation inside the headlights or tail lights
- Warning lights, flickering screens or electric windows that misbehave once power is restored
Photograph each of these before anything is cleaned or moved. The higher the water reached inside the cabin, the more serious the likely damage.
The First Week: Insurance or Not?
| Your situation | What usually happens | Your next step |
|---|---|---|
| Comprehensive cover, car written off | The insurer pays out and takes the car | Follow your insurer’s claim process |
| Comprehensive cover, car repaired | The insurer arranges and pays for repairs | Keep all repair records for when you sell later |
| Third party only or uninsured | Repairs are at your own cost | Compare a repair quote with what the car is worth |
The Youi article says insurers usually write a car off when repairs cannot be done safely or economically, typically when the cost would exceed the insured value. It also says that if floodwater has risen above the inner door sill, the law requires the car to be classed as a statutory write-off, which means it cannot be repaired and registered again. In Victoria, written off cars are recorded on the Written-Off Vehicle Register, which we explain in what to do when insurance writes off your car.
Deciding to Sell Instead of Repair
If the car is not insured for flood, or you would rather not take the risk of future electrical faults, selling it as it is can make sense. A few honest rules apply:
- Always tell the buyer about the flood. Hiding it is unfair, and the problems usually surface anyway.
- Do not spend on cosmetic cleaning expecting it to raise the price. Buyers price the hidden damage, not the shampoo.
- Get the car out of the weather if you can. Sitting wet speeds up corrosion and mould.
- Keep your photos and any insurer correspondence. They help a buyer understand what happened.
Who Buys Flood Damaged Cars?
Private buyers usually will not touch them. Licensed car buyers, wreckers and recyclers do, because they can price the risk and either repair, part out or recycle the car properly. If the car has become a statutory write-off, its value comes mainly from parts and metal. We explain the difference in junk vs salvage cars.
We buy damaged and non running cars across Melbourne and Victoria, including flood affected cars, and collect them with no pickup fee. You can read how damaged cars are valued on our sell a damaged car page. If storms brought hail as well as water, see storm and hail damaged cars.
Send us photos of the car and the water line, and our cash for cars service in Victoria will give you an honest price straight away.
Frequently Asked Questions
Should I start my car after a flood?
No. The VACC warns that starting a submerged engine can cause severe damage through hydraulic lock. Call your insurer or a professional first.
Will my insurer write off a flood damaged car?
Often, if repairs cannot be done safely or economically. Youi notes that water above the inner door sill means the car must be classed as a statutory write-off.
Can I sell a flood damaged car in Victoria?
Yes, as long as you are honest about the flood. Licensed buyers, wreckers and recyclers buy flood damaged cars as they are.
Is a flood damaged electric car dangerous?
It can be. Keep it at least 15 metres from buildings and other vehicles and do not charge it until a qualified technician has checked it.
Does flood damage show up later?
Often, yes. Corrosion in electronics and wiring can cause faults weeks or months after the water has gone.
Sources
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About the author: Written by Steve, owner of Victorian Car Buyers, a licensed motor car trader (LMCT 12395) based in Delahey, Melbourne.