Sample and test sludge
Version 2 - Last updated
28 Oct 2025
This is the new version of Wastewater & Sludge Guidelines
This version (V2) is published and available to prepare for. It will replace the active version (V1) and take effect from 01 Nov 2026. Until then, continue using Wastewater & Sludge Guidelines V1. View Changelog
Sludge sampling and testing requirements depend on the disposal pathway.
The purpose of sampling and testing of sludge is:
- To check for the detection of ZDHC MRSL substances as an indicator of deliberate use in input chemical formulations.
- To confirm that requirements for the major disposal pathway are met through the detection of metals and other applicable conventional parameters.
Disposal pathway A testing requirements
- Test ZDHC MRSL substances
- Test % solids
Disposal pathway B testing requirements
- Test ZDHC MRSL substances
- Test % solids
Disposal pathway C testing requirements
- Test ZDHC MRSL substances
- Test % solids
Disposal pathway D testing requirements
- Test ZDHC MRSL substances.
- Test listed metals to check if they exceed the threshold limit values. If a listed metal(s) exceeds the threshold value, test metal leachate(s).
- Test for conventional parameters (pH, % solids and paint filter test) and cyanide as applicable.
Disposal pathway E testing requirements
- Test ZDHC MRSL substances.
- Test listed metals to check if they exceed the threshold limit values. If a listed metal(s) exceeds the threshold value, test metal leachate(s).
- Test for conventional parameters (pH, faecal coliform, % solids and paint filter test) and cyanide as applicable.
Disposal pathway F testing requirements
- Test ZDHC MRSL substances.
- Test listed metals to check if they exceed the threshold limit values. If a listed metal(s) exceeds the threshold value, test metal leachate(s).
- Test for conventional parameters (pH, faecal coliform, % solids and paint filter test) and cyanide as applicable.
Disposal pathway G testing requirements
- Test ZDHC MRSL substances.
- Test listed metals to check if they exceed the threshold limit values. If a listed metal(s) exceeds the threshold value, test metal leachate(s).
- Test for conventional parameters (pH, faecal coliform, % solids and paint filter test) and cyanide as applicable.