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Tap Water CO2 Emissions

Estimate CO2 emissions from tap water use (m³ or L). Adjust the factor and see daily totals and a bathtub equivalent.

Input

Estimate the CO2 emissions generated in producing and delivering your tap water, based on how much you use. The factor is a representative value for water supply; including wastewater treatment pushes emissions higher. Results are approximate.

Volume unit

m³
Time period
kg/m³

A typical water-supply value is about 0.36 (higher if wastewater is included)

Result

CO2 emissions (estimate, factor 0.36 kg/m³)

7.2kg-CO2

Water used

20 m³

CO2 per day

0.24 kg

Bathtubs equivalent

about 100

CO2 per year (est.)

87.6 kg

How it works

  • CO2 emissions are calculated as water used (m³) × emission factor (kg-CO2/m³). When you enter the volume in liters it is divided by 1000 to convert to cubic meters.
  • The default emission factor is about 0.36 kg-CO2/m³, a representative value for the water supply. Including wastewater treatment makes the total larger, and factors vary by region, utility, and equipment, so adjust the factor to match a value from your bill or local provider.
  • CO2 per day is found by dividing the emissions over the selected period (1 day, 1 week = 7 days, 1 month = 30 days, 1 year = 365 days). CO2 per year multiplies the daily figure by 365 as an estimate.
  • The bathtub equivalent divides your usage by 200 liters per tub as a reference; actual tub capacity varies.
  • Use this as a rough guide for how much CO2 you can cut by saving water. For an accurate figure, check the latest emission factors published by your utility or local authority, as these factors vary by region.