Normal background concentrations of contaminants

Web map services (WMS)

Background contaminants

Domain polygons for normal background concentrations (NBCs) of contaminants in English soils data are made available to view here as a WMS service.

Data layers include:

  1. Domain polygons
    • Arsenic (As)
    • Benzo-[a]-pyrene (BaP)
    • Cadmium (Cd)
    • Chromium (Cr)
    • Copper (Cu)
    • Lead (Pb)
    • Mercury (Hg)
    • Nickel (Ni)
  2. Urbanisation index polygons defined from GLUD database
  3. Polygons defining areas of metalliferous mining derived from the Ove Arup database

Service address

Enter the address below into your WMS client.

The service supports the British National Grid and Lat/Long WGS84 coordinate systems and the data is visible when zoomed in between 1:100 000 and 1:25 000 scale.

Example WMS requests (versions 1.3.0 and 1.1.1 supported)


Lead domain polygon WMS 1.3.0 requests in British National Grid (BNG)


Cadmium domain polygon WMS 1.1.1 requests in Lat/Long WGS84 (WGS84)


Terms of use

These data are delivered under the terms of the Open Government Licence, subject to the following acknowledgement accompanying the reproduced BGS materials: “Contains British Geological Survey materials © UKRI [year]”. Contact us if you create something new and innovative that could benefit others

BGS provides no warranty as to the quality, accuracy, completeness of this free map data or the medium on which it is supplied. This includes any warranty as to the continued provision of material or that the material taken from this site is compatible with your computer system and/or any other data with which the material is to be used.

Please be aware that BGS may make changes to this service. This will include, but not limited to, the level of attribution seen for each type of geology, and changes to zoom thresholds. Please contact us if you have any feedback.

Get in touch

For more information about our datasets, technologies and map viewers please contact us

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