OEHHA has adopted an updated public health goal (PHG) of 1 part per billion (ppb) for perchlorate in drinking water. This PHG updates the 2004 perchlorate value of 6 ppb. Perchlorate is known to block the thyroid’s ability to take in and process iodide, which is a nutrient essential to brain development, growth, heart function, and other systems.
Feb 27, 2015