Cumulative risk analysis of carcinogenic contaminants in United States drinking water
Level 4 - case-series / case-control
Ecological risk assessment and mathematical modeling using secondary monitoring data (by design analogy, not clinical CEBM)
OpenAlex W2974253072 · doi:10.1016/j.heliyon.2019.e02314
What was done
The authors performed a cumulative risk analysis of carcinogenic contaminant occurrence in United States tap water using monitoring data from 2010 to 2017 to estimate national and state-level lifetime cancer risks and case burdens.
What was found
The model estimated that over 100,000 lifetime cancer cases could be attributable to carcinogenic contaminants in U.S. drinking water, driven primarily by arsenic, disinfection byproducts, and radioactive pollutants. State-level cumulative cancer risk ranged between 1 × 10⁻⁴ and 1 × 10⁻³. The overall national attributable risk was approximately 4 × 10⁻⁴, two orders of magnitude above the standard de minimis threshold of 1 × 10⁻⁶ (one in a million).
Why it matters
The study models the aggregate carcinogenic burden of multi-contaminant drinking water exposures across the U.S., demonstrating that cumulative exposure risks substantially exceed standard single-pollutant safety benchmarks.
Limits
The abstract provides modeled theoretical risk estimates rather than observed clinical or epidemiological cancer outcomes. It does not state the exact number of water systems, water samples, or specific risk equations evaluated. Risk extrapolation assumes standard additive effects and lifetime exposure consistency, which may not capture real-world toxicological interactions or localized exposure variations.
Cited by
- partial The Environmental Working Group reported that over 122 million Americans drink tap water containing high levels of chemicals known to cause cancer.
- supports The Environmental Working Group showed that over 122 million Americans drink tap water containing high levels of chemicals known to cause cancer.
- supports The Environmental Working Group showed that over 122 million Americans drink tap water containing elevated levels of known carcinogens.