City of Barstow Waste Water Treatment Plant Discharge Investigation, Barstow, California.

 The City of Barstow operates a waste water treatment plant (WWTP) along the southern bank of the Mojave River. Elevated nitrates found in drinking water at a nearby neighborhood prompted a large scale investigation overseen by the Regional Water Board.  Nitrogen and oxygen isotope analysis performed by DPRA’s laboratory, Zymax Forensics, has provided evidence that denitrification is occurring in and around the WWTP facility and aided in delineating the lateral and vertical extents of discharges.