Evaluates contaminants that could be used for intentional attacks on water quality, especially in the distribution system, and also evaluates 19 online sensors for their ability to detect the presence of these contaminants. Includes recommendations for further research and development work on sensors. Research partner: Kiwa N.V. Completed in 2005. Dutch edition published by Kiwa. English edition published by the Foundation in 2006. Release of the final report requires a special protocol that includes signing a nondisclosure agreement.