Since the arsenic maximum contaminant level was lowered from 50 ppb to 10 ppb in 2001, water systems have been scrambling to comply with this more stringent standard. For many […]

Worldwide, nitrates are the most common chemical contaminant in groundwater aquifers. In 1980, nine drinking water wells in California had unsafe levels of nitrates. By 2007, this acute contamination had […]