µg/l microgram per litre (one millionth of a gram per litre)

Hazard is any biological, chemical, physical or radiological agent that has the potential to cause harm.

hazardous event is an incident or situation that can lead to the presence of a hazard (what can happen and how).

Hard water is water containing a high level of calcium, magnesium, and other minerals,

Local authority means any of the following:

  • the Common Council of the City of London;
  • a London borough council;
  • a district council;
  • the council of a county in which there are no district councils.

Parameter is a property, element, organism or substance listed in the first column of the Tables in Schedule 1 as read, where appropriate, with the notes to that Schedule and those Tables

Prescribed concentration or value (PCV) is the numerical value assigned to drinking water standards defining the maximal or minimal legal concentration or value of a parameter.

Private supply iswater supplied for human consumption or food production which is not provided by a water undertaker or licensed water supplier.

Relevant person means any or all of the following:

  • The owner and the occupier (who may be the same or different persons) of premises (land and any buildings on it), which are supplied with water for domestic or food production purposes by means of a private supply;
  • The owner and the occupier (who may be the same or different persons) of land on which any part of the supply is situated;
  • Any other person who exercises powers of management or control in relation to that supply.

Risk is the likelihood of identified hazards causing harm in exposed populations in a specified timeframe, including the magnitude of that harm and/or the consequences.

Risk assessment is a review undertaken to identify actual or potential hazards to human health in a water treatment works and associated supply system. Prioritisation of risk is based on consideration of likelihood and consequence of the risk occurring.

Validation involves obtaining evidence that the elements of the water safety plan are effective.

Water Safety Plan (WSP) is the most effective way of ensuring that a water supply is safe for human consumption and that it meets the health based standards and other regulatory requirements. It is based on a comprehensive risk assessment and risk management approach to all the steps in a water supply chain from catchment to consumer.

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