Litres dispensed per day is an estimated total volume of water dispensed within the given time period. Data is derived from all transaction records collected from dispensers in the date range provided, for tags registered to relevant water systems, organisations and countries. These transactions are filtered to remove outliers (negative transaction amounts or transaction amounts greater than one billion, and transactions where literage was reported as negative or in excess of 200 litres). Transactions for tags that are not registered to a household are also not included in the calculation. The total number of litres dispensed within a 24 hour period (UTC midnight to midnight).

For each dispenser or asset perceived to be in service for relevant water systems, organisations or countries, this is the percentage of hours within the 24 hours of each day (UTC midnight to midnight) for which downtime was reported by the asset. Downtime does not include water supply or communication problems, but relates to faults with the asset and its hardware. The specific faults that apply to this number are as follows: Power failure, low battery, valve fault, valve jam. For each day, the total number of downtime hours is divided by the total number of potential hours (24 multiplied by the number of assets).

For each dispenser or asset perceived to be in service for relevant water systems, organisations or countries, this is the percentage of hours within the 24 hours of each day (UTC midnight to midnight) for which low flow downtime was reported by the asset. Downtime does not include connectivity or dispenser hardware problems, but relates to faults with the water supply. The specific faults that apply to this number are as follows: Low flow. For each day, the total number of downtime hours is divided by the total number of potential hours (24 multiplied by the number of assets).

Unique people served per day is an estimated total number of unique people served per day, derived from all transaction records collected from dispensers in the date range provided, for tags registered to relevant water systems, organisations and countries. These transactions are filtered to remove outliers (negative transaction amounts or transaction amounts greater than one billion, and transactions where literage was reported as negative or in excess of 200 litres). Transactions for tags that are not registered to a household are also not included in the calculation. The number of unique tags that performed a transaction in this time is counted and multiplied by the average number of households registered to a tag, and them multiplied by the average household size. The average household size is obtained from the latest UN Database on Household Size and Composition

Unique households served per day is an estimated total number of unique households served per day, derived from all transaction records collected from dispensers in the date range provided, for tags registered to relevant water systems, organisations and countries. These transactions are filtered to remove outliers (negative transaction amounts or transaction amounts greater than one billion, and transactions where literage was reported as negative or in excess of 200 litres). Transactions for tags that are not registered to a household are also not included in the calculation. The number of people in each unique household served by these transactions is counted. Any household that performs a transaction is only ever counted once for any given day, regardless of usage frequency or volume within that day.