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What “flood” legally means in an Australian insurance policy

Seven water bodies, one regulation, and a note that stops a product disclosure statement redefining the word. If the water in your house never came out of one of those seven, it is not a flood — and a flood exclusion is the wrong reason to decline it.

Read from primary sources · Editor-reviewed · Current as at 20 September 2026
By the waterdamagequotesau.com editorial team · Published 20 September 2026 · Last reviewed 20 September 2026 · 9 min read
4 primary sources cited on this page. How we check what is on this site

This is the single most useful page on this site, and it is short, because the law is short.

Insurance Contracts Regulations 2017 (Cth) reg 34(1) · 2021 compilation, read 20 September 2026

“flood means the covering of normally dry land by water that has escaped or been released from the normal confines of any of the following…”

Paragraphs (a) to (d) each add the words “whether or not it has been altered or modified”, so a concrete-lined channel is still a creek.

The seven things:

  1. a lake — whether or not it has been altered or modified
  2. a river — whether or not it has been altered or modified
  3. a creek — whether or not it has been altered or modified
  4. another natural watercourse — whether or not it has been altered or modified
  5. a reservoir
  6. a canal
  7. a dam

That is the complete list. There is nothing else in it.

The part that makes it matter

Insurance Contracts Regulations 2017 (Cth) reg 34(1), note; Insurance Contracts Act 1984 (Cth) s 37B(3) · 2021 compilation, read 20 September 2026

The note to reg 34 says the meaning in subsection (1) applies in the prescribed contract “even if the meaning of the word provided by the prescribed contract (or by a notice or other document or information given by the insurer in relation to the prescribed contract) is different”.

A definition that a contract can override is a suggestion. This one cannot be overridden. For a prescribed contract, reg 34 applies the statutory meaning even where the policy provides a different one — and the note goes further than the policy document, reaching any notice, document or information the insurer gave you about the contract.

So the sentence people reach for — “but my PDS defines flood as…” — is usually the wrong sentence. For most householders the PDS definition is decorative. What governs is the regulation.

What is not a flood

Work through the list and the omissions do the work:

Water that did not come out of one of the seven listed sources.
Where the water came fromFlood under reg 34(1)?
Rain falling directly on and into the buildingNo
Surface run-off across the ground, including from a neighbour’s landNo
A street stormwater drain that could not cope and surchargedNo
A blocked sump or a failed pump in your own yardNo
Groundwater rising through a slabNo
The sea, high water or a tsunamiNo — named separately at reg 19(1)(a)(xiv)
A river, creek or natural watercourse breaking its banksYes
A lake rising over its normal confinesYes
A reservoir, canal or dam releasing or escapingYes
A channelised or concrete-lined creekYes — “altered or modified”

Why this cuts both ways. If the water came out of a creek, calling it storm damage will not help you and the assessor will work it out. If it did not, an insurer relying on a flood exclusion is relying on a definition that does not reach your water, and that is a point worth putting in writing before you do anything else.

Which regulation governs, by where the water came fromFour sources of water and the provision each one falls under. Water that never left a lake, river, creek, natural watercourse, reservoir, canal or dam is not flood under reg 34(1), whatever the policy calls it.Where did the water come from?The answer decides which provision of the Insurance Contracts Regulations 2017 governs, and the policy wording cannot change it.Water got into the buildingA fixed pipe, tank, hose,cistern or applianceattached to the buildingreg 19(1)(a)(vi)Named in standard cover.The escape is covered;the failed part is wherereg 19(2)(b) wear and tearcomes back in.Rain, during a storm,through the roof,a window or a gapreg 19(1)(a)(xiv)Storm and tempest.A separate event fromflood, in the samesubparagraph. Policiesprice them apart.A lake, river, creek,natural watercourse,reservoir, canal or damreg 34(1)This is legally flood.The statutory meaningapplies even where thepolicy defines the worddifferently.Run-off across the ground,or a stormwater drainthat could not copereg 34(1), by omissionNot on the list of seven.So it is not flood, and aflood exclusion is notthe right reason todecline it.Sewage sits across two of these: a blocked fixed drain points at reg 19(1)(a)(vi), a sewer surcharged by a swollen creek points at reg 34.
Four sources of water and the provision each one falls under. Water that never left a lake, river, creek, natural watercourse, reservoir, canal or dam is not flood under reg 34(1), whatever the policy calls it.

Get the drying moving either way

The definition argument can take weeks. Water in a subfloor cannot.

“Whether or not it has been altered or modified”

Four of the seven paragraphs carry those words, and they were drafted to close a specific argument. Australian cities are full of creeks that have been straightened, lined, culverted, piped and renamed as drains. Without those words, an insurer could argue that once a creek is concrete it is a drain, and a drain is not on the list.

With them, a channelised urban creek is still a creek. If the water in your house came out of something that used to be a watercourse and now looks like infrastructure, find out what the council calls it and what it was. The answer is frequently in a flood study the council has published.

Who this applies to, and who it does not

Reg 34 works through reg 33, which lists the prescribed contracts. Householders who bought a home building, home contents or combined policy direct or through a comparison site are inside it. Strata title residences are inside it, at reg 33(1)(d). Small business is inside it, at reg 33(1)(e) and (f).

Insurance Contracts Regulations 2017 (Cth) reg 35(1) · 2021 compilation, read 20 September 2026

The regulation’s own note says 190 hours is the equivalent of five employees each working a 38-hour week.

And then the carve-out:

Insurance Contracts Regulations 2017 (Cth) reg 33(2) · 2021 compilation, read 20 September 2026

If a broker arranged your policy as your agent, the prescribed-contract rules do not apply and the policy’s own definition governs. Brokered commercial property policies frequently define flood more broadly than reg 34 — sometimes to the insured’s advantage, sometimes not. Ask your broker which definition is in your wording before you argue from this page.

The business trap in reg 34(2)

Reg 34(2) is aimed at insurers, not at you, but it tells you something useful. Where an insurer wants to use the word “flood” in a business policy with a meaning other than the statutory one, it must take reasonable steps to ensure the contract is not a prescribed contract — that is, that the business is not a small business as reg 35 defines it. The regulation’s own note adds that the insurer is likely to rely on information the insured provided, and that giving false or misleading information is a serious matter.

The practical reading: if your business is near the reg 35 line, the answers you gave at underwriting about turnover and staff hours may decide which definition of flood applies to your claim.

Get flood and water damage quotes

Restoration companies advertising for your postcode. Whether it was legally a flood or not, the drying is the same work.

What happened

What let the water in?

Where is it up to right now?

Who are you in relation to the property?

Are you claiming on insurance?

Four digits. It decides who can actually get to you, and which state’s building rules apply to the repair.

A useful answer looks like: “Flexi hose under the kitchen sink let go overnight. Kitchen and hallway carpet soaked, water has reached the second bedroom. Plumber capped it at 7am. Nobody has been out to dry it.”

  • Sent to restoration companies that advertise for your area, and to no more than three
  • Free to you — those companies pay a fixed advertising fee per enquiry, agreed in advance
  • No obligation, and nothing here affects your insurance claim

Your enquiry is ready to send

Here is what happens after you submit:

  1. Your answers go to restoration companies that advertise for your postcode.
  2. No more than three of them may contact you, using the details you gave.
  3. You decide who, if anyone, you use. You are committed to nothing, and this does not lodge, alter or affect an insurance claim.

We are not a restoration company and we do not attend, assess or repair anything.

Common questions

What is the standard definition of flood in Australia?

Reg 34(1) of the Insurance Contracts Regulations 2017 (Cth): the covering of normally dry land by water that has escaped or been released from the normal confines of a lake, a river, a creek, another natural watercourse, a reservoir, a canal or a dam. The first four each carry the words “whether or not it has been altered or modified”.

Can my policy define flood differently?

Not for a prescribed contract. The note to reg 34 and s 37B(3) of the Insurance Contracts Act apply the statutory meaning even where the contract, or a notice or document the insurer gave you about it, says something else.

Is stormwater run-off a flood?

Not under reg 34(1). Run-off across the ground has not escaped from a lake, river, creek, natural watercourse, reservoir, canal or dam. If an insurer declines a run-off claim on a flood exclusion, the definition it is relying on is the statutory one, and the statutory one does not reach it.

Is a concrete-lined drain a creek?

It can be. Paragraphs (a) to (d) each add “whether or not it has been altered or modified”, which was drafted precisely to stop the argument that channelising a creek stops it being a creek.

Does the flood definition apply to my business?

Only if it is a small business as reg 35 defines it: turnover under $1,000,000 in the last completed financial year and no more than 190 employee hours a week. Above that, the policy's own definition governs.

Sources cited on this page

  1. Insurance Contracts Regulations 2017 (Cth)
  2. Insurance Contracts Regulations 2017 (Cth) reg 34(1)
  3. Insurance Contracts Regulations 2017 (Cth) reg 34(1), note; Insurance Contracts Act 1984 (Cth) s 37B(3)
  4. Insurance Contracts Regulations 2017 (Cth) reg 35(1)

Every figure above was read from the source it is attributed to on 20 September 2026. How we check this.

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