Guidance
Monitoring discharges to water: CEN and ISO monitoring methods
Formerly part of M18, index of CEN and ISO monitoring methods for monitoring discharges to water.
Applies to England
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Details
The methods in this document are international standards recommended by regulation.
Updates to this page
Published 11 June 2020
Last updated 8 September 2026
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A standard for polyfluoroalkyl substances (PFAS) has been added in place of the standard for Perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA)
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New standards added for biochemical oxygen demand (BOD), cyanide, nitrogen (total), total organic carbon, organochlorine pesticides, polycyclic aromatic hydrocarbons, short-chain polychlorinated alkanes, and volatile organic carbons. Those for BOD and nitrogen (total) supersede previous versions.
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First published.