Change of https://www.gov.uk/government/publications/monitoring-discharges-to-water-cen-and-iso-monitoring-methods

Change description : 2026-09-08 15:40:00: A standard for polyfluoroalkyl substances (PFAS) has been added in place of the standard for Perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) [Guidance and regulation]

Showing diff : 2023-01-18 14:04:03.524720047 +00:00..2026-09-08 14:41:01.177593990 +00:00

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.

From:: Environment Agency
~~Published~~Published:: 11 June 2020
Last ~~updated~~updated:: 18; 8 ~~January~~September ~~2023~~ 2026 — See all updates

Applies to England

Documents

Monitoring discharges to water: CEN and ISO monitoring methods

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Details

The methods in this document are international standards recommended by regulation.

Published 11 June 2020

Last updated 188 ~~January~~September ~~2023~~ ~~+ show~~2026 — Show all updates

Update history

2026-09-08 15:40
A standard for polyfluoroalkyl substances (PFAS) has been added in place of the standard for Perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA)

2023-01-18 14:04
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.