Water Quality Assessment and Health Risk Evaluation

Water quality assessment and health risk evaluation encompass a suite of methodologies to characterise the chemical, physical and biological attributes of freshwater resources and to translate those measurements into metrics of human and ecological exposure. Central to this discipline is the development of integrated indices that distil complex datasets—ranging from heavy metal concentrations and nutrient loads to microbial contamination—into actionable indicators such as water quality indices and hazard quotients. Contemporary approaches harness remote sensing, geographic information systems and multivariate statistics to map spatial and temporal trends, identify pollution sources and quantify exposure pathways. These assessments underpin regulatory frameworks and guide interventions in drinking-water treatment, agricultural management and ecosystem protection. Robust risk evaluation further relies on dose–response models and quantitative microbial risk assessment to estimate probabilities of adverse outcomes, from non-carcinogenic toxicity to waterborne illness. By linking field data to health end-points, this research domain informs policy on water safety standards, prioritises remediation measures and supports the United Nations Sustainable Development Goals for clean water and public health.

Research from Nature Portfolio

A longitudinal study of groundwater in a rapidly urbanising district revealed that shifts in land use and land cover, notably the expansion of built-up areas and agricultural intensification, are closely associated with declining water quality and rising burdens of waterborne and chemical-related illnesses. Analysis of satellite imagery alongside water-borne disease records demonstrated that nitrate concentrations surged in agricultural catchments, correlating with a marked increase in infant methemoglobinemia. Elevated calcium and magnesium levels were linked to higher rates of urinary tract infections and dental caries. This work emphasises the value of integrating geospatial analytics with health surveillance to inform site-specific policies on land management and drinking-water regulation.

Water Quality Assessment and Health Risk Evaluation publication trend

The graph below shows the total number of articles in water quality assessment and health risk evaluation across all publications each year (not limited to Nature Index journals).

Technical terms

Water Quality Index (WQI): A composite score that reflects overall water quality by aggregating multiple physicochemical and biological parameters into a single value.

Hazard Quotient (HQ): The ratio of estimated exposure to a substance over a reference dose, used to assess potential for non-carcinogenic health effects.

Chronic Daily Intake (CDI): The average daily dose of a contaminant ingested per unit body weight, integrated over a specified exposure period.

Quantitative Microbial Risk Assessment (QMRA): A framework for estimating the likelihood of infection or illness from exposure to pathogenic microorganisms in water.

Land Use/Land Cover (LULC): Classification of the Earth’s surface into categories such as urban, agricultural and natural vegetation, used to examine human impacts on water resources.

References

1. Human health and ecology at risk: a case study of metal pollution in Lahore, Pakistan. Environmental Sciences Europe (2024).
2. Impact of land use/land cover changes on water quality and human health in district Peshawar Pakistan. Scientific Reports (2021).
3. A review of physicochemical and biological contaminants in drinking water and their impacts on human health. Water Science and Engineering (2023).
4. Climate Change, Water Quality and Water-Related Challenges: A Review with Focus on Pakistan. International Journal of Environmental Research and Public Health (2020).