Water Engineer – Central Utility Plant (CPU)

onsemi is seeking a Water Engineer - Central Utility Plant (CPU) for our Hopewell Junction, New York site. The Water Engineer is responsible for the technical ownership, reliability, optimization, and compliance of all water treatment and distribution systems supporting a 300mm semiconductor fabrication facility. This role ensures continuous delivery of ultrapure water (UPW), and associated utility systems required to maintain uninterrupted semiconductor manufacturing operations. The Water Engineer partners with Facilities Operations, Process Engineering, Equipment Engineering, EHS, Quality, and external vendors to drive system reliability, reduce operating costs, improve sustainability, and support capacity expansion projects. Responsibilities Water System Ownership Own site water systems: UPW, RO, DIW, industrial, potable, and chemical delivery systems Reliability & Operations Develop and execute reliability strategies Improve availability, capacity, quality, and cost Lead troubleshooting and support 24/7 operations Water Quality Management Ensure compliance with semiconductor water specs Monitor key metrics: resistivity, TOC, silica, DO, particles, microbes Investigate excursions and implement corrective actions Continuous Improvement Reduce water, chemical, energy use, and waste Lead sustainability and water reuse initiatives Perform root cause analysis (8D, RCA, FMEA, etc.) Maintenance Strategy Define PM programs and optimize predictive maintenance Track MTBF, MTTR, availability, and cost Manage spare parts and critical inventory Project Engineering Lead system upgrades and capacity expansions Manage scope, schedule, budget, and contractors Review designs, P&IDs, and construction packages Compliance Ensure EPA, local, and wastewater permit compliance Support audits and maintain documentation Data & Reporting Monitor systems via SCADA/facility systems Develop KPIs and dashboards Report performance to leadership Key KPIs UPW availability ≥ 99.9% Zero water quality excursions and permit violations Improve the reuse rate, reduce consumption, and lower costs Improve MTBF, reduce MTTR Required Qualifications Education Bachelor’s Degree in: Chemical Engineering, Environmental Engineering, Mechanical Engineering, Civil Engineering, or Related Engineering Discipline Experience 3+ years of experience in: Semiconductor Facilities in Water Treatment Systems, Industrial Utilities, Central Utility Plant Operations Technical Knowledge Strong knowledge of: UPW Systems, RO Membrane Systems, Ion Exchange Technologies, Chemical Treatment Processes, SCADA Systems, PLC Controls, Semiconductor Utility Requirements, Water Chemistry Preferred Qualifications Experience supporting a 300mm semiconductor fab, Experience with advanced UPW systems in high-volume manufacturing, Professional Engineer (PE) license, Six Sigma Green Belt or Black Belt, Project Management experience, Knowledge of sustainability and water reclamation programs. Salary: onsemi is excited to share the base salary range for this position is $75.300 to $120,400 exclusive of fringe benefits or potential bonuses. The final pay rate for the successful candidate will depend on geographic location, skills, education, experience, and/or consideration of the internal equity of our current team members. We also offer a competitive benefits package.