The City of Paso Robles, California, used an online trihalomethane (THM) analyzer capable of low-level real-time detection of DBCM and BDCM to help characterize and monitor THMs in its treated wastewater for groundwater recharge use. The high frequency of reliable and accurate THM data provided by the THM-100™ proved essential to the City’s DBP strategy to maintain regulatory compliance with NPDES permit levels.