An easy to use A to Z of some of the most commonly used terms used throughout the water industry.
Pipe serving an individual property that crosses into third party land, for example the public highway, to reach the public sewer.
The water which leaks out of a water company's underground pipes or the private water supply pipes owned by customers.
less sensitive areas
A water body or area where the discharge of wastewater does not adversely affect the environment. (See Annex II of EC directive 91/271/EEC). In the UK, also referred to as high natural dispersal areas (HNDAs).
licence of appointment
Legal document granting water company permission to operate.
The quantity or mass of any substance transported in an effluent per unit time (the product of concentration of pollutant and effluent flow).
long run marginal cost (LRMC)
The additional cost of meeting extra demand for water (or sewerage). In the long run this will include both operating and capital costs. Companies have estimated figures for water both on a steady demand basis and a peak demand basis, and these are published by Ofwat in their annual tariffs report. Ofwat's view is that companies need to refer to LRMC in setting tariffs and charges for bulk supplies.