Potential health risks from consumption of water with arsenic in Colima, Mexico

Objective. To estimate potential health risks due to chronic ingestion of arsenic from groundwater in Colima, Mexico. Materials and methods. Samples were randomly taken in 36 wells from 10 local aquifers. Analysis was performed by ICP-OES following international standards. Geostatistical interpolation was performed with ArcGIS, implementing a model weighting inverse distance to estimate arsenic routes of exposure and consumption on each locality. The Hazard Quotient Ratio (HQ) and carcinogenic risk (R) for As were estimated. Results. The weighted average HQ for arsenic in Colima is 2.41. There are HQ>1 values indicating adverse non-cancer health effects by continuous and prolonged intake of water with arsenic, which could affect 183 832 individuals in the state. The risk of developing any type of cancer among the population in this study due to high arsenic concentrations in groundwater (R) is 1.089E-3, which could statistically cause 446 cases of cancer. Conclusions. Current levels of arsenic in groundwater increase carcinogenic and non-carcinogenic human health risks in Colima.