The County Sanitation Districts of Los Angeles County undertook a significant upgrade at their wastewater treatment plant near downtown Los Angeles, California. This upgrade involved the installation of five gaseous-fueled engines, utilizing a natural gas primary fuel source and propane as a backup, at an effluent pump station. The primary aim was to align with an EPA-mandated expansion of the secondary treatment process and to enhance treatment capacity. To ensure compliance with stringent emissions regulations and optimize engine performance, the engines were equipped with twenty of Continental Controls Corporation ECV5 air/fuel ratio control valves. These valves addressed challenges related to fuel control in power generation and the oil and gas industry, ensuring efficient engine operation, emission reduction, and adherence to environmental standards. The installation represented a significant advancement in both performance and environmental sustainability for the wastewater treatment facility.