Alternately, you can do a book search on Google Books.
UN database maybe a good place to start with regard to water quality, hydrology and point source contamination. The have case studies, facts figues, standard proceducers etc..
Check this site and you can move from there.
http://www.unesco.org/water/wwap/wwdr2/
Title: Water a Shared Responsibility: The United Nations World Water Development Report 2 (Paperback)
Just checked, it would be US$66, you could download that free from UN website.
Cheers
kolwan