Low water use per head

TL;DR

In a keynote to the 1st Island Water Congress (IWRA, 2024), Manuel Sapiano of the Energy and Water Agency showed a slide saying: “Per capita water consumption, today stands at around 110l/cap/day.” The previous slide says tariffs and engagement have “contributed to maintaining the per capita water consumption low”. We tested the figure against Eurostat’s household water-use series. It is close, but Eurostat’s estimate for Maltese households is higher, and Malta sits mid-table among the EU states that report. The keynote does not compare Malta with other countries; that framing came from the intake record, not from the speaker.

1. The figure is about right. Eurostat puts Maltese households’ use of public water at 116–120 litres per person per day in 2022–2024 (an estimate, 9% above 110 in 2024), against “around 110” in the keynote.
2. It covers households only. All uses of the public supply, including services such as hotels, come to about 169–176 litres per head per day on the same basis, because the supply also serves tourists, shops and industry.
3. “Low” is not shown by this comparison. Among the 19 EU states with a recent household figure, Malta ranks 13th from the lowest, 8% above the median (111 l). The speaker made no EU comparison, so this does not contradict the keynote.
4. The tariff effect is untested. We found no evidence on how much the rising block tariff changed use; we did not obtain the tariff schedule.
5. Verdict: largely supported (moderate confidence). The central figure agrees with Eurostat within about 10%. “Low” is a qualitative word that the keynote does not benchmark.

1. Supported
2. Largely supported
3. Not substantiated
4. Misleading
5. Contradicted

IN THIS REPORT

1 The claim and what we could verify

The primary source is the slide deck of the keynote “Water Management in the Maltese Islands” by Manuel Sapiano, Energy and Water Agency, at the IWRA 1st Island Water Congress, 2024 [1]. We downloaded and read all 27 slides (the file is dated 15 October 2024). It is a slide deck, not a transcript: we cannot see what was said aloud. The wording we rate is on slide 10.

2 Method

Question. Is Maltese per-person water use about 110 litres a day, and is it low?

Evidence. Eurostat env_wat_cat (water use by supply category and sector, OECD/Eurostat Joint Questionnaire on Inland Waters; public water supply, households) and demo_pjan (population on 1 January) [2][3], retrieved 7 October 2026. Per-person use = households’ volume divided by the mean of the 1 January population of that year and the next, converted to litres per day. Every Maltese value is flagged as estimated by Eurostat. The calculation is tools/cc-040-report/calc.py; inputs and results are in data/cc-040/.

Grades. Official statistics are grade C; the speaker’s slide is grade D (an assertion without method or source). Verdicts follow the five-point scale in Appendix A.

3 What the data show

Values in data/cc-040/checks.csv. “All uses” divides all sectors’ use of the public supply by the resident population; it includes use by tourists and businesses, so it is not a per-resident consumption figure.

Malta among EU states

Eurostat has a recent household figure for 19 of the 27 Member States (Estonia, Finland, France, Ireland, Italy, Luxembourg, Portugal and Slovakia have none from 2020 on). Taking each state’s latest year (2020–2024; Spain and Sweden 2020, Belgium and Germany 2022), Malta’s 120 litres ranks 13th from the lowest and is 8% above the median of 111 litres (Figure 2). Latvia, Lithuania, Czechia, Belgium and Romania are below 90; Greece (220) and Cyprus (294) are far higher [2].

4 Where the evidence points different ways

5 Testing the claim

6 Verdict and requests for evidence

Why. (1) The headline number, 110 litres, is within about 9% of Eurostat’s household figure for 2024 and 5% for 2022. (2) The keynote gives no benchmark for “low” and no source for the 110, and the tariff effect is not evidenced, so we rate them as not shown rather than false. (3) The EU comparison in the claim record is not the speaker’s statement; we report it (Malta is mid-table) without rating it. Our scale calls backing with caveats that do not change the substance Largely supported.

What this verdict does not say. It does not say that Malta’s water use is low by European standards or that its water supply is sustainable. The keynote itself says natural freshwater is insufficient even at highly efficient demand (slide 3).

Evidence we are asking for

• The source and definition of the 110 litres figure (billed domestic, per resident, year).
• WSC domestic billed consumption and the resident population used, 2015–2024.
• The rising block tariff schedule and any estimate of its effect on use.

7 Limitations

• We read slides only: any spoken qualification is not in the deck.
• Eurostat’s Maltese values are estimates; its metadata page for the dataset family (env_nwat_esms) refers to the Joint Questionnaire definitions, which we did not read in full.
• Eurostat’s per-person figure uses our population denominator (mean of two 1 January populations); WSC may use another.
• EU comparison covers 19 states with different years (2020–2024); countries differ in how they measure household use. Greece and Cyprus are very high, so we use the median.
• We did not search WSC or NSO publications for a 110 litres series; none was found through Eurostat or in our web search of 7 October 2026 (see literature/CC-040/notes.md).

References

1. [1] Sapiano M. (2024). Water Management in the Maltese Islands. Keynote, IWRA 1st Island Water Congress. Energy and Water Agency (slide deck, 27 slides). https://www.iwra.org/proceedings/congress/resource/IWRA2024_1stIslandWC_0609_HLP_EuroInbo_MSapiano_Keynote.pdf
2. [2] Eurostat. env_wat_cat, Water use by supply category and economical sector (public water supply, households; status flags checked); retrieved 7 Oct 2026. https://doi.org/10.2908/ENV_WAT_CAT
3. [3] Eurostat. demo_pjan, Population on 1 January by age and sex; retrieved 7 Oct 2026. https://doi.org/10.2908/DEMO_PJAN
4. [4] Eurostat. Environment and water statistics, explanatory texts (env_nwat_esms). https://ec.europa.eu/eurostat/cache/metadata/en/env_nwat_esms.htm
5. [5] MiŻien. Data and calculations: data/cc-040/; tools/cc-040-report/calc.py.

Appendix A: series standards and verdict scale

Every investigation in this series follows the same rules so that verdicts are comparable and challengeable.

Confidence

High: multiple independent lines of evidence agree. Moderate: evidence is relevant but incomplete or indirect. Low: evidence is thin, second-hand or conflicting.

Evidence grades

A experiment · B observational study with a control or gradient · C review, guidance or official statistics · D assertion or anecdote. ◆ marks a source known only second-hand.

Standards

• Quote the speaker, not the headline, with outlet and date, and link the original where possible.
• Separate the claim from the evidence offered for it, and say who made which statement.
• Grade the evidence and show differing views side by side where the evidence is unsettled.
• State what we could not access or verify, and what would change the verdict either way.
• Ask for the missing evidence in specific, answerable requests.
• Offer a right of reply where a check finds a claim Not substantiated, Misleading or Contradicted (or a pledge Not measurable, Off track or Missed), before wider circulation, and append responses.
• Correct errors openly with a version number and change log.
• Whistle-blow only on evidence: a verdict of Misleading or Contradicted requires documents or data that can be shown, not inference.
• Check every side. Government, opposition, NGOs and developers are held to the same standard.

Appendix B: revision log