Orange County Water District (OCWD) manages the large groundwater basin that provides reliable, high-quality groundwater to 20 cities and water agencies and their 2.3 million customers in north and central Orange County. The OCWD lab facilities include analytical equipment capable of establishing water quality to the parts per million level and beyond. The facility includes a "clean lab" to support the careful monitoring of trace metals at the parts per billion level, ensuring that drinking water is always delivered in full compliance with local and federal regulations.