Meters on each home tell Irish Water exactly how much water is used by that household. Irish Water has no way of knowing how many people live in individual households at any given time so individual consumption is an estimate.
In order to calculate estimated individual consumption Irish Water works off household occupancy figures that are based on original registration data (which was incomplete as it was reliant on self-declaration from householders and it is increasingly out of date) and a sample survey Irish Water took of metered households in 2014 which provided a snapshot in time. Based on that original data and survey, Irish Water report quarterly to the CER on estimated domestic water consumption. The purpose of the quarterly domestic consumption reports is predominantly to monitor quarterly trends in domestic consumption against those estimates used in the tariff setting process in 2014.
It is important to note that the quarterly domestic consumption reports remove very high users or outliers from the dataset as these may indicate a leak. Households using more than 800 litres per day are treated as outliers and removed from the dataset in order to replicate the methodology used in the 2014 tariff setting process. This average usage metric is called ‘Regulated PCC (Per Capita Consumption)’ to reflect that it omits high users and to distinguish it from actual per capita consumption (PCC) i.e. actual PCC includes outliers or high usage, making it higher.
These reports provided to the CER show the estimated consumption per occupant for each occupancy group. It should be noted that doubling or trebling the number of occupants does not necessarily double or treble the amount of water used, i.e. you do not put on the washing machine or dishwasher or fill the sink that multiple of times.
We have to make the assumption that the occupancy data is accurate in order to compile these estimates. The meter reading on individual households will always be accurate so a household consumption figure is always up to date, exact and accurate. Meter readings are the most reliable source of information we have for water consumption.
|Household||Water supply and wastewater services||Water supply or wastewater services|
|1 Adult||160 per year||80 per year|
|2+ Adults||260 per year||130 per year|
Metered charges are based on the volume of water supplied.
Water services are measured in m³ (1 m³ = 1 cubic metre = 1,000 litres).
If you have a water meter you will pay no more than the capped charges of €160 for a single adult household and €260 for a multi adult household, but if you conserve water you could pay less.
If a household property is not permanently occupied, for example a holiday home, there will be water charges if the property is connected to both water supply and wastewater services or to a single service.
If the property is unmetered the charge is €125 per year for both water supply and wastewater services and is €62.50 per year for a single service.
If the property is metered the minimum charge is €125 per year for both water supply and wastewater services and €62.50 per year for a single service. The maximum charge is €260 per year for both services and €130 per year for a single service.
Call Irish Water on 1850 448 448