Summary
This epidemiological study investigated nitrate contamination in Valencia's drinking water—the highest in Spain and Europe—and its association with cancer mortality across 258 municipalities. The research found that cancer mortality rates rose with increasing nitrate exposure for gastric cancer in both sexes and for prostate cancer, with relative risk calculated across age groups and exposure levels. The findings contribute to understanding potential health risks from nitrate contamination in agricultural regions where intensive fertiliser use contaminates groundwater.
Regional applicability
The study was conducted in Spain and addresses nitrate contamination from agricultural intensification in a Mediterranean region. Whilst Valencia has notably high nitrate levels, findings may be relevant to intensive agricultural areas in the United Kingdom where nitrate leaching from fertiliser use is monitored, though UK water treatment and nitrate thresholds differ; transferability would depend on local water quality and agricultural practices.
Key measures
Nitrate concentration levels in public drinking water; cancer mortality rates (stomach, bladder, prostate, colon) by municipality; relative risk estimates by age group and nitrate exposure level
Outcomes reported
The study examined the relationship between nitrate exposure levels in public drinking water across 258 municipalities in Valencia and cancer mortality rates for stomach, bladder, prostate, and colon cancers. Cancer mortality rates were analysed in relation to different levels of nitrate exposure in the drinking water supply.
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