• Water Chemistries

• H2OU - For K-12 students and teachers

• American Chemical Society (ACS)

• American Water Works Association (AWWA)

• Association of Metropolitan Sewerage Agencies (AMSA)

• International Water Association (IWA)

• National Association of Water Companies (NAWC)

• National Groundwater Association (NGWA)

• National Rural Water Association (NRWA)

• Water Environment Federation (WEF)

• Water Environment Research Foundation (WERF)

• Water Online

• Water Quality Association (WQA)

• Centers for Disease Control and Prevention (CDC)

• Environmental Protection Agency (USEPA)

• European Environment Agency

• New Ideas in Pollution Regulation
(Global perspective on current public policy issues)

• American Academy of Environmental Engineers (AAEE)

• Awwa Research Foundation

• National Council for Science and the Environment — Congressional Research Service Reports
   related to water.

• Instrumentation, Systems, and Automation Society (ISA)

• ISO 9000 — International Organization for Standardization

• Water Resources Research Center — University of Arizona's glossary of water-related terms.