Water quality research examines the chemical, physical and biological characteristics of water and how they affect ecosystems and human health. A central focus is how nutrients, especially nitrogen and phosphorus, drive eutrophication in lakes, rivers and coastal zones. When these nutrients accumulate, they fuel algal blooms that reduce oxygen, damage aquatic habitats and can produce toxins harmful to people and animals.

Studies show that land use strongly shapes water quality. Agricultural areas contribute fertilizers, manure and pesticides. Urban regions add stormwater runoff, road salt, heavy metals and organic contaminants. Forested catchments generally yield cleaner water, but can still be affected by logging, fires and atmospheric deposition.

A key research theme is contaminant transport. Nutrients and pollutants move through soils, groundwater and surface waters in complex ways that depend on climate, geology, hydrology and human infrastructure. Climate change intensifies many problems by altering precipitation patterns, increasing extreme events and raising water temperatures, which can amplify algal blooms and oxygen depletion.

Monitoring and modeling are critical tools. Field measurements and sensor networks track parameters such as nutrients, dissolved oxygen, turbidity, temperature and pathogens. Models integrate these data to predict how water quality responds to land management, wastewater discharges and climate shifts, supporting scenario analysis and policy design.

Management strategies evaluated in the research include improving wastewater treatment, optimizing fertilizer use, restoring wetlands and riparian buffers, reducing erosion and redesigning drainage systems. Effective protection of water resources typically requires coordinated actions across entire watersheds, long term monitoring and adaptive management that responds to new data and changing environmental conditions.