This draft European Standard specifies a method for the determination of the sludge (bulk) density. The procedure to determine density of the liquid and of the solid fractions of a suspension is described in Annex C. This document is applicable to sludge suspensions from: storm water handling; urban wastewater collecting systems; urban wastewater treatment plants; treating industrial wastewater similar to urban wastewater (as defined in Directive 91/271 EEC); water supply treatment plants. This method is also applicable to sludge suspensions from other origin, provided the necessary verifications are done.