- Benton County Water Quality - Philomath High School senior class project that monitors water quality of swimming holes. Includes photos of the sites and water quality results.
- CEEP - Centre Européen d'Etudes sur les Polyphosphates - Information concerning the impact of phosphates on aquatic systems and the environment, the properties and performance of polyphosphate products, and measures to reduce phosphate discharges.
- Clean Lakes Program - EPA's information resources on clean lakes, including links to on-line documents, the latest [1994] published 305(b) report, and ordering instructions for other documents about clean lakes.
- Environmental Protection Agency, Ireland - National Freshwater Quality Database - Web interface to database of water quality in Ireland. Interactive maps and graphs show water quality for rivers and lakes throughout the country. Also includes links to reports on inland water quality. (Requires Java 1.1 browser.)
- Living Water - Applying ecological principles and natural systems to create water and waste solutions for households, communities, agriculture, landfills and industry.
- North Carolina Nonpoint Source Management Program - Programs to reduce water pollution from land use practices such as construction and agriculture.
- North Carolina State University Water Quality Group - A multidisciplinary team that analyzes and conducts natural resource management programs with an emphasis on nonpoint source (NPS) pollution policy,assessment, and control technologies.
- Nutrient Net Demo - Demonstration of a market-based approach for protecting and improving water quality. Nutrient trading involves allowing sources to trade in ways that meet local and watershed-wide water quality goals.
- Nutrient Pollution - Discusses how nitrogen and phosphorus enrichment affect Chesapeake Bay and other aquatic systems.
- Pollutants And Human Activities - 7th graders Dave and Adnan built with website providing information on water testing, pullutants, and watersheds.
- SEL Environmental - Brownfield Redevelopment and Sustainable Drainage - SEL Environmental is a sub-contractor specialising in engineered solutions for passive and active gas protection to structures, stormwater management, in-ground vertical geomembrane barrier and vent trenches.
- Stream Reach Management: An Expert System (STREAMES) - Computer application being developed to help water managers to evaluate the effect of large nutrient loads on stream nutrient retention, by analyzing relationships between stream nutrient retention and several physical, chemical and biological parameters. Overview, participants, sample study sites in the Mediterranean region, and publications.
- The Lorch Foundation - Charitable trust foundation that promotes education and research in water purification and related technologies.
- USGS National Analysis of Trace Elements - Assessment of trace elements in ground water, surface water, streambed sediment, and fish and clam tissue across the United States.
- USGS Toxics Substances Hydrology Program - Goal is to provide unbiased earth science information on the behavior of toxic substances in U.S. hydrologic environments.
- Water Quality Products - Provideseditorial content including developments in water conditioning, filtration and disinfection for residential, commercial and industrial systems.
- Waterose Environmental Sciences - Judith Burke, British Columbia water inventory specialist, provides articles, photos and information related to water quality, testing, salmon restoration, and related topics. Also includes resume, paintings, and cartoons.
- Watershed and Coastal Resources of Orange County, California - Presented to raise awareness of water-quality issues. Offers information on rainfall, weather, watersheds, stormwater projects, and pollution.
- Waterwatch Victoria - Organisation which carries out monitoring programs, and the testing of physical and chemical properties of water.