Single Domestic Dwelling

Definition of a Single Domestic Dwelling

A private supply to a single dwelling is one where the water is supplied only for domestic purposes (water used for cooking, drinking, food preparation and washing) and where the water is not used for any commercial activity (such as bed and breakfast). Some examples of single dwellings include the following (this list is illustrative and is not exhaustive):

  • a house (detached, semi-detached, terraced)
  • a bungalow/chalet (detached, semi-detached)
  • flats/apartments

Risk Assessment Requirements

A local authority is not required to conduct a risk assessment for a private supply to a single dwelling. However, if the owner or occupier (including a tenant) asks the local authority to conduct a risk assessment, then the local authority must do so in accordance with the Regulations.

The local authority can recover the reasonable cost of conducting this service up to a specified maximum.

Monitoring Requirements

The Regulations do not require supplies to single domestic dwellings to be monitored however if the owner or occupier requests this service then the local authority will conduct monitoring of the supply for the following parameters:

  • Conductivity
  • Enterococci
  • Escherichia coli (E.coli)
  • hydrogen ion (pH value)
  • turbidity

As with the risk assessment process the local authority may charge the person making the request the cost of carrying out the monitoring up to a maximum of £25.

If the risk assessment identifies a risk to human health then further monitoring will be required. This analysis may incur additional costs.

A local authority can monitor a private supply to a single dwelling for the parameters outlined above if they are concerned of a potential danger to human health from the supply. However in this instance they cannot charge the owner or occupier the cost of conducting this monitoring.

Local authorities should aim to complete both the risk assessment and sampling during the same visit so that the risk assessment can inform whether additional parameters need to be included in the monitoring. Local authorities should only include additional parameters if there is reasonable evidence to suggest their presence at concentrations approaching or exceeding the standards or indicator parameter values in Schedule 1 to the Regulations.

For further information then please contact your local authority


Page reviewed: 31 August 2016
Page modified: 31 August 2016

Drinking Water Inspectorate