Benzo(a)pyrene Rarely Found in Drinking Water, Exposure Risk Low: Taiwan EPA

Taiwan's Environmental Protection Administration (EPA) has addressed public concerns regarding benzo(a)pyrene (BaP) in drinking water, stating that its presence is extremely rare and poses minimal exposure risks. This clarification follows recent discussions and questions from environmental groups about the regulation of BaP in potable water, particularly after a salad oil product was found to exceed BaP limits.

The EPA explained that BaP, a byproduct of incomplete combustion at high temperatures, is a polycyclic aromatic hydrocarbon (PAH) with high fat solubility and very low water solubility. Due to these physical and chemical properties, it is seldom found in drinking water. The agency also pointed out that international standards vary, with some Asian neighbors like Singapore setting drinking water limits for BaP, while Japan and South Korea have not.

Furthermore, the EPA assured the public that even if BaP were present in raw water sources, Taiwan's standard water purification processes, including coagulation, sedimentation, and filtration, effectively remove suspended particles to which BaP tends to adhere. This, combined with a high record of drinking water quality compliance, means the public can drink tap water with confidence. The EPA previously included BaP in a preliminary monitoring list and will now convene an expert meeting to assess its inclusion in a second-tier list for targeted testing and monitoring.

This initiative aims to establish a background database for BaP and encourage self-monitoring by water treatment facilities. The EPA will continue to oversee regular purification and turbidity control measures to ensure water quality safety. The agency emphasized its commitment to proactive risk management and safeguarding public health.