{ "retrievedAt": "2026-11-07", "recommendedMainSeries": { "title": "Customer water use across Melbourne\u2019s metropolitan retailers", "totalLabel": "Total customer use (GL/year)", "perPersonLabel": "The same water use per person (L/person/day)", "geography": "Greater Western Water, South East Water and Yarra Valley Water; before July 2021, City West Water plus Western Region Water are used in place of Greater Western Water.", "includes": "Billed residential and non-residential drinking/non-drinking water, excluding recycled water.", "excludes": "Recycled water, network losses and other non-revenue water; supplies to other retailers. This is not the broader Melbourne Water bulk-supply total.", "formula": "sum(W8.3+W9.3) \u00d7 1,000,000 / sum(C1 people) / actual days in financial year", "time": "Financial years from 1 July to 30 June. 2019\u201320 and 2023\u201324 have 366 days.", "populationNote": "BOM population estimates reported by the same water retailers. C1_Hist_2024-25 is in thousands; converted to people. C1 from 2024\u201325 is already in people.", "comparabilityNote": "Custom aggregation, not a BOM-published Melbourne series. Western Region is included before the merger so its coverage is already present in 2020\u201321. Despite that, aggregate reported C1 population falls from 5,201,504 to 4,985,234 in 2021\u201322 (\u2212216,270; \u22124.16%). Published SEW and YVW sources explicitly describe downward population revisions following Census 2021. Do not interpret the resulting per-person increase entirely as changed consumption behaviour. The historical C1 series has not been harmonised to a single census vintage or population-estimation method.", "rows": [ { "year": "2017-18", "startYear": 2017, "days": 365, "population": 4931358, "residentialMl": 286374.0, "nonResidentialMl": 113320.0, "customerUseMl": 399694.0, "customerUseGl": 399.694, "customerUseLitresPerPersonPerDay": 222.05892470076608, "residentialLitresPerPersonPerDayCalculated": 159.10146887933567, "nonRevenueMl": 50555.0, "useIncludingNonRevenueMl": 450249.0, "observations": [ { "provider": "City West Water Corporation", "indicator": "C1", "value": 1052.804, "unit": "population 000s", "source": "npr2021", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2020-21/Part_B_The_complete_dataset_2020_21.zip", "sheet": "Complete dataset", "cell": "M2480", "original_value": 1052.804, "sourceFootnote": "" }, { "provider": "City West Water Corporation", "indicator": "W8.3", "value": 59246.0, "unit": "ML", "source": "npr2021", "sourceUrl": 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"unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "L44577", "original_value": "32,196.30", "sourceFootnote": "" }, { "provider": "Yarra Valley Water Corporation", "indicator": "W10.1", "value": 17085.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "L44578", "original_value": "17,085.00", "sourceFootnote": "" } ], "qualityFlags": [ "CUSTOM_AGGREGATION", "POPULATION_ESTIMATE", "C1_UNIT_CHANGE" ] } ], "populationDiscontinuity": { "year": "2021-22", "previousPopulation": 5201504, "population": 4985234, "changePeople": -216270, "changePercent": -4.157835887466399, "chartAnnotation": "Population estimates changed after Census 2021; compare per-person use across this point with care.", "boundaryHandling": "City West Water and Western Region Water are both included before their July 2021 merger into Greater Western Water. Adding Western Region only after the merger would create a further avoidable geographic break.", "providerChanges": [ { "provider": "Greater Western Water / predecessor pair", "beforePeople": 1364836, "afterPeople": 1250300, "changePeople": -114536 }, { "provider": "South East Water", "beforePeople": 1840000, "afterPeople": 1810000, "changePeople": -30000 }, { "provider": "Yarra Valley Water", "beforePeople": 1996668, "afterPeople": 1924934, "changePeople": -71734 } ], "confirmedEvidence": [ { "source": "sewCensus2022", "pages": [ 5, 22 ], "finding": "SEW explicitly attributes changed per-person estimates to COVID impacts and Census 2021 finding fewer people in its region than previously predicted. Its annual report\u2019s service-population count differs from NPR C1, so use this as evidence of a methodology change, not a numeric reconciliation." }, { "source": "yvwCensus2022", "printedPages": [ 95, 143 ], "finding": "YVW explicitly says it recalibrated its per-capita population denominator after Census 2021, with about 80,000 fewer people than previously estimated. Its submission describes a broader Melbourne revision of about 220,000. The rounded revision is not claimed to equal the exact annual C1 change." }, { "source": "gwwCensus2022", "printedPage": 11, "finding": "GWW labels its sampling-locality population table as Census 2021 based; no exact explanation of the 114,536-person change versus its predecessor C1 totals was found." } ], "unresolved": "No source inspected fully reconciles the aggregate C1 discontinuity, including GWW\u2019s decline. The original GWW NPR footnote notes a unit-entry error, without explaining the population-level change. Do not label the full decline as real migration or a fully quantified census rebase." } }, "desalination": { "title": "Desalinated water added to supply", "definition": "Actual annual net desalinated water sourced/reported supplied, not annual orders. Water may enter storage and be consumed later, so these figures cannot identify desalinated water actually consumed at household taps in the same year.", "rows": [ { "year": "2016-17", "startYear": 2016, "actualMl": 46209.0, "actualGl": 46.209, "source": "npr2025", "metric": "Net desalinated marine/estuarine water sourced by Melbourne Water (W3.1), based on treated-water production", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W3.1", "value": 46209.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "T23041", "original_value": "46,209.00", "sourceFootnote": "No water was sourced from desalination during 2023/24 and 2024/25. The zero return for 2024/25 is due to no desalination water being ordered for the year." }, "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "days": 365, "qualityFlags": [ "DESAL_PRODUCTION_PROXY" ] }, { "year": "2017-18", "startYear": 2017, "actualMl": 14972.0, "actualGl": 14.972, "source": "npr2025", "metric": "Net desalinated marine/estuarine water sourced by Melbourne Water (W3.1), based on treated-water production", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W3.1", "value": 14972.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "S23041", "original_value": "14,972.00", "sourceFootnote": "No water was sourced from desalination during 2023/24 and 2024/25. The zero return for 2024/25 is due to no desalination water being ordered for the year." }, "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "days": 365, "qualityFlags": [ "DESAL_PRODUCTION_PROXY" ] }, { "year": "2018-19", "startYear": 2018, "actualMl": 22374.0, "actualGl": 22.374, "source": "npr2025", "metric": "Net desalinated marine/estuarine water sourced by Melbourne Water (W3.1), based on treated-water production", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W3.1", "value": 22374.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "R23041", "original_value": "22,374.00", "sourceFootnote": "No water was sourced from desalination during 2023/24 and 2024/25. The zero return for 2024/25 is due to no desalination water being ordered for the year." }, "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "days": 365, "qualityFlags": [ "DESAL_PRODUCTION_PROXY" ] }, { "year": "2019-20", "startYear": 2019, "actualMl": 118879.0, "actualGl": 118.879, "source": "npr2025", "metric": "Net desalinated marine/estuarine water sourced by Melbourne Water (W3.1), based on treated-water production", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W3.1", "value": 118879.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "Q23041", "original_value": "118,879.00", "sourceFootnote": "No water was sourced from desalination during 2023/24 and 2024/25. The zero return for 2024/25 is due to no desalination water being ordered for the year." }, "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "days": 366, "qualityFlags": [ "DESAL_PRODUCTION_PROXY" ] }, { "year": "2020-21", "startYear": 2020, "actualMl": 125381.0, "actualGl": 125.381, "source": "npr2025", "metric": "Net desalinated marine/estuarine water sourced by Melbourne Water (W3.1), based on treated-water production", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W3.1", "value": 125381.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "P23041", "original_value": "125,381.00", "sourceFootnote": "No water was sourced from desalination during 2023/24 and 2024/25. The zero return for 2024/25 is due to no desalination water being ordered for the year." }, "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "days": 365, "qualityFlags": [ "DESAL_PRODUCTION_PROXY" ] }, { "year": "2021-22", "startYear": 2021, "actualMl": 125382.0, "actualGl": 125.382, "source": "npr2025", "metric": "Net desalinated marine/estuarine water sourced by Melbourne Water (W3.1), based on treated-water production", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W3.1", "value": 125382.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "O23041", "original_value": "125,382.00", "sourceFootnote": "No water was sourced from desalination during 2023/24 and 2024/25. The zero return for 2024/25 is due to no desalination water being ordered for the year." }, "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "days": 365, "qualityFlags": [ "DESAL_PRODUCTION_PROXY" ] }, { "year": "2022-23", "startYear": 2022, "actualMl": 4180.0, "actualGl": 4.18, "source": "npr2025", "metric": "Net desalinated marine/estuarine water sourced by Melbourne Water (W3.1), based on treated-water production", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W3.1", "value": 4180.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "N23041", "original_value": "4,180.00", "sourceFootnote": "No water was sourced from desalination during 2023/24 and 2024/25. The zero return for 2024/25 is due to no desalination water being ordered for the year." }, "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "days": 365, "qualityFlags": [ "DESAL_PRODUCTION_PROXY" ] }, { "year": "2023-24", "startYear": 2023, "actualMl": 0.0, "actualGl": 0.0, "source": "npr2025", "metric": "Net desalinated marine/estuarine water sourced by Melbourne Water (W3.1), based on treated-water production", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W3.1", "value": 0.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "M23041", "original_value": 0, "sourceFootnote": "No water was sourced from desalination during 2023/24 and 2024/25. The zero return for 2024/25 is due to no desalination water being ordered for the year." }, "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "days": 366, "qualityFlags": [ "DESAL_PRODUCTION_PROXY", "CONFIRMED_ZERO" ] }, { "year": "2024-25", "startYear": 2024, "actualMl": 0.0, "actualGl": 0.0, "source": "npr2025", "metric": "Net desalinated marine/estuarine water sourced by Melbourne Water (W3.1), based on treated-water production", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W3.1", "value": 0.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "L23041", "original_value": 0, "sourceFootnote": "No water was sourced from desalination during 2023/24 and 2024/25. The zero return for 2024/25 is due to no desalination water being ordered for the year." }, "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "days": 365, "qualityFlags": [ "DESAL_PRODUCTION_PROXY", "CONFIRMED_ZERO" ] }, { "year": "2025-26", "startYear": 2025, "actualMl": 58300, "actualGl": 58.3, "source": "quality2026", "page": 5, "metric": "Water supplied by the Victorian Desalination Plant during the financial year, reported by Melbourne Water", "note": "Reported to 0.1 GL in the 2025\u201326 Water Quality Annual Report. Source changes from NPR W3.1; do not claim precision beyond the source or that this equals water consumed at taps.", "sourceUrl": "https://www.melbournewater.com.au/media/eyJtZWRpYSI6IjMxNDgxIn0%253D/downloads", "days": 365, "qualityFlags": [ "SOURCE_CHANGE", "ROUNDED_SOURCE" ] } ] }, "broaderBulkSupply": { "title": "Melbourne Water drinking water supplied to the urban water system", "warning": "Broader supplier geography than the consumption series; do not divide by metropolitan retailer population or put household Target150 on this per-capita metric.", "rows": [ { "year": "2015-16", "gl": 432.835, "source": "npr2025", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W11.3", "value": 432835.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "U23065", "original_value": "432,835.00", "sourceFootnote": "" } }, { "year": "2016-17", "gl": 428.363, "source": "npr2025", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W11.3", "value": 428363.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "T23065", "original_value": "428,363.00", "sourceFootnote": "" } }, { "year": "2017-18", "gl": 448.811, "source": "npr2025", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W11.3", "value": 448811.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "S23065", "original_value": "448,811.00", "sourceFootnote": "" } }, { "year": "2018-19", "gl": 460.885, "source": "npr2025", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W11.3", "value": 460885.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "R23065", "original_value": "460,885.00", "sourceFootnote": "" } }, { "year": "2019-20", "gl": 449.584, "source": "npr2025", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W11.3", "value": 449584.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "Q23065", "original_value": "449,584.00", "sourceFootnote": "" } }, { "year": "2020-21", "gl": 439.176, "source": "npr2025", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W11.3", "value": 439176.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "P23065", "original_value": "439,176.00", "sourceFootnote": "" } }, { "year": "2021-22", "gl": 446.754, "source": "npr2025", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W11.3", "value": 446754.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "O23065", "original_value": "446,754.00", "sourceFootnote": "" } }, { "year": "2022-23", "gl": 453.075, "source": "npr2025", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W11.3", "value": 453075.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "N23065", "original_value": "453,075.00", "sourceFootnote": "" } }, { "year": "2023-24", "gl": 470.679, "source": "npr2025", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W11.3", "value": 470679.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "M23065", "original_value": "470,679.00", "sourceFootnote": "" } }, { "year": "2024-25", "gl": 508.998, "source": "npr2025", "observation": { "provider": "Melbourne Water Corporation", "indicator": "W11.3", "value": 508998.0, "unit": "ML", "source": "npr2025", "sourceUrl": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "sheet": "Complete dataset", "cell": "L23065", "original_value": "508,998.00", "sourceFootnote": "" } }, { "year": "2025-26", "gl": 504, "source": "quality2026", "page": 4, "approximate": true } ] }, "officialResidentialBenchmarks": { "warning": "Separately published household-only per-person values. Do not use as the denominator or normalised counterpart for total customer/system consumption. Original annual reports often use estimated Q4 and later Water Outlook numbers revise them.", "rows": [ { "year": "2020-21", "litresPerPersonPerDay": 159, "source": "target150" }, { "year": "2021-22", "litresPerPersonPerDay": 164, "source": "target150" }, { "year": "2022-23", "litresPerPersonPerDay": 161, "source": "outlook2025" }, { "year": "2023-24", "litresPerPersonPerDay": 163, "source": "outlook2025" }, { "year": "2024-25", "litresPerPersonPerDay": 169, "source": "outlook2026" } ] }, "sources": { "npr2025": { "title": "Bureau of Meteorology National Performance Report 2024\u201325, Part B", "url": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_The_complete_dataset_2024-25.xlsx", "landing": "https://www.bom.gov.au/water/npr/", "sha256": "5cced76335000d015170077c7eca37edae90eeba05fdb139272e4edcfc590017" }, "npr2021": { "title": "Bureau of Meteorology National Performance Report 2020\u201321, Part B", "url": "https://www.bom.gov.au/water/npr/docs/2020-21/Part_B_The_complete_dataset_2020_21.zip", "landing": "https://www.bom.gov.au/water/npr/npr_2020-21.shtml" }, "definitions": { "title": "BOM NPR Indicators and definitions handbook, February 2025", "url": "https://www.bom.gov.au/water/npr/framework-review/document/NPR_Indicators_and_definitions_handbook_Feb_2025.pdf", "pageNumbering": "PDF page numbers; printed page numbers are 5 lower", "pages": { "population": 21, "desalination": 107, "residential": 110, "nonresidential": [ 110, 111 ] } }, "comparability": { "title": "BOM National Performance Report 2024\u201325: major urban centres", "url": "https://www.bom.gov.au/water/npr/docs/2024-25/NPR_2024-25_02-Major-urban-centres.pdf", "page": 1 }, "quality2026": { "title": "Melbourne Water Water Quality Annual Report 2025\u201326", "url": "https://www.melbournewater.com.au/media/eyJtZWRpYSI6IjMxNDgxIn0%253D/downloads", "pages": { "total_supply": 4, "desalination": 5 } }, "target150": { "title": "DEECA Target 150: saving water in our cities", "url": "https://www.water.vic.gov.au/for-households/target-150-saving-water-in-our-cities" }, "outlook2025": { "title": "Melbourne\u2019s Annual Water Outlook 2025", "url": "https://www.gww.com.au/sites/default/files/2024-12/2025%20Melb%20Water%20Outlook%20Final_%20December%202024%20.pdf", "page": 8 }, "outlook2026": { "title": "Melbourne\u2019s Annual Water Outlook 2026", "url": "https://www.melbournewater.com.au/media/eyJtZWRpYSI6IjMwMTUxIn0%3D/downloads", "page": 12 }, "desal_orders": { "title": "DEECA Desalination", "url": "https://www.water.vic.gov.au/water-sources/desalination", "note": "Orders are not actual financial-year production. 2026\u201327 order deliveries began 1 June 2026." }, "sewCensus2022": { "title": "South East Water Annual Report 2021\u201322", "url": "https://www.vgls.vic.gov.au/client/en_AU/search/asset/1304211/0", "originalUrl": "https://southeastwater.com.au/content/dam/about-us/corporate-info/reports-and-plans/2021-22%20Annual%20Report%20for%20South%20East%20Water.pdf", "originalUrlStatus": "404 on direct fetch; government library copy downloaded and checked", "pages": [ 5, 22 ], "pageNumbering": "PDF and printed page numbers match" }, "yvwCensus2022": { "title": "Yarra Valley Water 2023\u201328 Price Submission, 2022", "url": "https://www.esc.vic.gov.au/sites/default/files/documents/29092022%20ESC%20-%20YVW%20Price%20Submission.pdf", "printedPages": [ 95, 143 ], "pdfPages": [ 96, 144 ], "footnote": 141 }, "npr2022": { "title": "BOM National Performance Report 2021\u201322, Part B", "url": "https://www.bom.gov.au/water/npr/docs/2021-22/Urban_NPR_The_complete_dataset_2021-22.xlsx", "note": "Original C1 cells checked for the three retailers. GWW footnote J4956 says the unit of measure was entered incorrectly; no causal population-change explanation is given. SEW and YVW C1 footnotes are empty." }, "gwwCensus2022": { "title": "Greater Western Water Drinking Water Quality Report 2021\u201322", "url": "https://www.gww.com.au/sites/default/files/2022-10/GWW%20Drinking%20Water%20Quality%20report%202021-22.pdf", "printedPage": 11, "note": "Table 4 explicitly uses Census 2021 population for sampling localities; this alone does not establish an exact reconciliation to NPR C1." }, "desal2017Corroboration": { "title": "BOM National Performance Report 2016\u201317, Part A", "url": "https://www.bom.gov.au/water/npr/docs/2016-17/nationalPerformanceReport2016_17UrbanWaterUtilitiesLowerRes.pdf", "section": "2.1.1", "note": "Explicitly describes 46,209 ML delivered to the Melbourne system, corroborating the W3.1 figure." } }, "indicatorDefinitions": { "C1": { "meaning": "Provider estimate of people receiving its non-recycled water supply services during the reporting year. The provider chooses a defensible estimation method. This is not a count of properties and is not necessarily an ABS capital-city population.", "unit": "people from 2024\u201325; prior C1/C1_Hist_2024-25 data are in thousands", "source": "definitions", "pdfPage": 21 }, "W8.3": { "meaning": "Water supplied to residential customers, including billed metered and unmetered use. Covers drinking and other non-recycled water.", "unit": "ML", "source": "definitions", "pdfPage": 110 }, "W9.3": { "meaning": "Water supplied to customers other than households, including businesses, institutions, irrigators and public facilities. Excludes recycled water, non-revenue water and supply to other water service providers.", "unit": "ML", "source": "definitions", "pdfPages": [ 110, 111 ] }, "W3.1": { "meaning": "Net desalinated marine/estuarine water actually produced for the provider during the reporting year, normally measured at treated-water outflow. Excludes waste brine, saline groundwater desalination, and imports from another water provider.", "unit": "ML", "source": "definitions", "pdfPage": 107 }, "derivedTotalCustomerUse": { "meaning": "W8.3 plus W9.3 across the selected retailers. Includes household and non-household use; excludes recycled water and non-revenue water.", "unit": "ML, divided by 1,000 for GL" }, "derivedTotalCustomerPerCapita": { "meaning": "The same total customer use divided by the same retailers\u2019 reported population and actual financial-year days. This is an area-wide population-normalised use indicator, not household behaviour or drinking water used by an average person at home.", "unit": "L/person/day" } }, "qualityFlagDefinitions": { "CUSTOM_AGGREGATION": "Our arithmetic across official provider rows; not a published BOM city total.", "POPULATION_ESTIMATE": "Population is provider-reported and method/vintage may differ between utilities and years.", "PRE_MERGER_SOURCES": "City West and Western Region are from the 2020\u201321 dataset because the latest file omits retired providers.", "POPULATION_BREAK": "Census-related population revisions and provider merger make cross-year per-capita comparisons less clean.", "LEAP_FINANCIAL_YEAR": "Derived daily values use 366 days.", "C1_UNIT_CHANGE": "2024\u201325 C1 is people; historical C1 is thousands. Converted consistently before aggregation.", "DESAL_PRODUCTION_PROXY": "W3.1 is actual net treated desalinated water sourced, not orders or water consumed at taps.", "CONFIRMED_ZERO": "Published zero, supported by the current MW source footnote; not a missing value.", "SOURCE_CHANGE": "2025\u201326 uses a MW water-quality report instead of NPR W3.1.", "ROUNDED_SOURCE": "2025\u201326 actual supply reported to 0.1 GL; 58,300 ML is a unit conversion, not greater precision." }, "sourceLimitations": [ "The consumption and population series end at 2024\u201325, the latest NPR dataset checked. Do not fabricate a matched 2025\u201326 consumption/population row from MW bulk supply.", "The population-normalised customer-use metric includes businesses and institutions. Household Target 150 must not be plotted as its target.", "Reported population is not a single-vintage re-estimated historical series. Changes in estimates, coverage, census inputs and billing estimation can affect trends.", "Bulk Melbourne Water supply includes a different service area and network/customer boundary; it must not be substituted for customer use.", "Desalination orders have their own delivery schedule and can straddle financial years. Actual sourced or supplied water is the appropriate series here.", "Desalinated water may be stored and blended before consumption; no annual end-use-at-taps fraction can be inferred from these figures.", "Sources are publicly accessible official datasets/reports. Dataset licence and any production-service reuse terms should be checked separately before commercial distribution." ] }