What is the current effective Maximum Contaminant Level (MCL) for Arsenic in potable well water?
Based on health related studies, the USEPA adopted a new standard on February 22, 2002 to lower the MCL for arsenic to 10 ppb. In September 2003, NJDEP Commissioner Bradley Campbell issued a policy directive for the development of a proposed regulation for arsenic in drinking water of 5 ug/l, which was adopted in December 2004. The purpose of this new standard is to decrease long-term exposure to arsenic in drinking water. The effective date of this new MCL (5 ppb) will be January 23, 2006, and all New Jersey drinking water supplies will be required to comply with 5 ppb by January 23, 2006. This new regulation will provide added protection for all New Jersey residents. In the meantime, the MCL for arsenic is 50 ppb from now until January 23, 2006.
A11: The NJDEP adopted a new drinking standard (MCL) to decrease long-term exposure to arsenic in drinking water. The effective date of this new MCL (5 ug/l or 5 ppb) was January 23, 2006, and all New Jersey drinking water supplies were required to comply with 5 ppb by January 23, 2006. This new regulation will provide added protection for all New Jersey residents.
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