Applying a cumulative risk framework to drinking water assessment: a commentary.

Area of Science:

• Environmental Health
• Toxicology
• Risk Assessment

Background:

• Current drinking water assessments evaluate contaminants individually, overlooking combined health impacts.
• Air quality assessments utilize cumulative risk frameworks, a model transferable to water quality evaluations.
• Existing methods often separate the assessment of carcinogenic and non-carcinogenic contaminants.

Discussion:

• A novel methodology integrates a cancer risk metric with a non-cancer health indicator index.
• The framework incorporates disability weights from the Global Burden of Disease study for comprehensive health impact assessment.
• This unified approach generates a numeric toxicity score to quantify the health risks of co-occurring contaminants.

Key Insights:

• The developed methodology provides a holistic assessment of drinking water quality by considering multiple contaminants simultaneously.
• A unified toxicity score can help identify and prioritize risks associated with complex contaminant mixtures.
• This approach addresses the limitations of single-chemical assessments in understanding cumulative health effects.

Outlook:

• Further research is required to refine contaminant-specific parameters and understand chemical interaction modes.
• The cumulative risk model can inform policy decisions and guide the selection of effective drinking water treatment strategies.
• This framework offers a pathway for more accurate and comprehensive evaluation of drinking water safety.