http://h2o.usgs.gov/
This is a grand daddy water page... start here and explore your interests

http://www.wqa.org/wqahome.html
dedicated to water quality professionals, has good glossary of terms, some special studies

http://water.wr.usgs.gov/data/all.html
Very cool site to get All California stream flow data, can localize on portions of SB county streams too. Realtime charts available from this link.

http://water.wr.usgs.gov/data/index.html

http://dfg.ca.gov
Dept of Fish and Game, check out the water links, (and the wildlife galleries too)

http://www.ucsc.edu/mb//Water.shed/water.html this link gives ordering info for good water testing kits (it's also part of a good model project for stream testing in Monterey area)

http://www.wqa.org/WQIS/Water-Source-Taps.html

http://www.wqa.org/WQIS/Glossary/ GlossHome.html

http://www.regis.berkeley.edu/grasslinks/salmongl.html Salmon projects, mapping links