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Perth

AU · Water Corporation

Grade A

Grade A — no material assumption — the figure may be sorted, ranked and compared. How the grade is set →

Cost of 1,000 litres

AUD 3.92

standardized household · 15 m³ a month

A month, water

AUD 58.79

AUD 706 a year

A month, with wastewater

Held

non_standardizable

How much of the bill is wastewater

New York 61%

Paris 57%

Sydney 51%

London 41%

Tokyo 41%

Hong Kong 37%

Singapore 34%

How much of the bill sits outside the volumetric rate

Perth 86%

Singapore 63%

Paris 57%

Seoul 42%

Dubai 25%

Sydney 17%

London 14%

Abu Dhabi 5%

New York 0%

Both comparisons are proportions, so they hold across currencies. The bills themselves do not, and are not compared.

Cost by volume

A household on 5,000 litres a month pays about 107% more per litre than one on 25,000, because the fixed charges spread over less water.

Where the water comes from

DesalinationGroundwaterSurface

Perth draws on two seawater desalination plants, groundwater and surface catchment. Shares are withheld under Rule 9.5: no annual production mix with a year attached has been captured.

Sources, assumptions and data quality

ComparabilityGrade A

Tariff effective2026-07-01

ReconciledNot against an invoice

Reference connectionPerth metropolitan residential service — no connection-size parameter — the residential tariff carries no connection-size parameter. Water Corporation prices the residential water service charge as a single fixed state-wide amount of A$305.05, while pricing the business equivalent by meter size from A$324.18 at 20 mm to A$99,282.40 at 350 mm. The distinction is the publisher's own: there is no residential size band to designate.

ValidationSource verified ✓ · Calculation verified ✓ · Public reconciliation ✓

Publication · water supplyPublished

Publication · total water servicesHeld — non_standardizable

ScopeReference account is a separately metered Perth metropolitan residential property. Properties on a shared strata meter are billed to the strata manager and are a different customer.

ScopeThe benchmark prices a full bill year at 2026-27 rates. No individual customer experiences exactly that: a bill year starts with the first meter reading of the reading cycle, between March and October depending on location, so a real bill year straddles the 1 July price change and the July or August bill is priced at the previous year's tiers.

ScopeTotal Water Services is not published for Perth. Sewerage and drainage are assessed on Gross Rental Value, which is a property valuation rather than a water quantity.

SourceWater Corporation, Western Australia — Understanding your water use charges; Understanding your service charges (2026-27)

SourceCommonwealth of Australia — A New Tax System (Goods and Services Tax) Act 1999, s 38-285 Water