Where contaminants have been identified, and acceptable mitigations made to protect the water supply, following a risk assessment the local water undertaker may agree to pipework being installed in a contaminated environment.
Examples:
Underground pipework should never be installed in a contaminated environment such as culverts, drains or sewerage systems.
Some water fittings, including those manufactured from non-metallic materials, can be susceptible to damage or permeation if exposed to hydrocarbons, pesticides, insecticides and other sources of contamination. For this reason, they should never be installed where they could come into direct contact with these substances.
The recommended distances between utilities can be found in the latest National Joint Utilities Group (NJUG) guidelines. Where these dimensions and depths cannot be achieved protective measures will be required.
Above ground pipework should be protected from exposure to corrosive atmospheres, sunlight and other sources of heat gain or loss.
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