13/03/2008 Added Isolation Methods Survey - March 2007 18/07/2006 Added Performance Assessments and Statistics in Health Protection Agency EQA Schemes 31/03/2006 Added Performance Evaluation in the EQUAL Scheme for Indicator Organisms 17/11/2005 Added Isolation Methods Survey - August 2005 06/07/2005 Added EQUAL Schemes for Indicator Organisms and Surface Water Participant Questionnaire 14/12/2004 Added Guidance Notes for Laboratory Self-Assessment - EQUAL Scheme 14/12/2004 Added Isolation Methods Survey - December 2004 11/02/2004 Added The following document is available form BSI:- Water Quality - Enumeration of micro-organisms in water samples - Guidance on the estimation of variation of results with particular reference to the contribution of uncertainty of measurement. 22/11/2002 Added A new section showing Links to other documents and websites that may be of interest to you.

EQUAL: External Quality Assessment with LENTICULE discs

The monitoring of drinking water and surface waters used for recreational purposes is increasingly called for in both national and international regulatory standards.