Senior I&C Engineer, Water/Wastewater
Posted Sep 3, 2026 · We last checked this listing on Oct 6, 2026
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Likely interview questions for this role
Written from this job description, not a generic list. Each one notes what the interviewer is really checking.
About your past
Tell me about a time you added control points to an existing SCADA system without disrupting a plant that had to stay running.
What they are checking: Whether they respect that water and wastewater plants cannot go offline, and plan cutovers around that.
Tell me about a time a field issue during startup traced back to your design. What did you do?
What they are checking: Whether they own their mistakes openly and fix them fast rather than blaming the contractor or integrator.
How do you mentor junior engineers on I&C design while still hitting project deadlines?
What they are checking: Whether a senior engineer builds the team's skill or just does all the hard work themselves.
What would you do
During construction, the contractor submits instruments that don't match your spec but claims they're equal. How do you handle that submittal?
What they are checking: Whether they can judge an or-equal fairly and hold the line when it matters to the owner.
You're on a MEPIC team with electrical, mechanical and process engineers. How do you keep your I&C design coordinated with theirs?
What they are checking: Whether they catch interface problems between disciplines early instead of during construction.
A utility operator tells you the new HMI screens are harder to use than the old ones. How do you respond?
What they are checking: Whether they treat operators as the real end users and adjust designs based on their feedback.
About the work
Walk me through how you'd lay out the instrumentation for a new raw water pump station, from the wet well to the SCADA screen.
What they are checking: Whether they can think through a full loop of sensors, controls and communications instead of listing parts one by one.
How do you put together a P&ID and instrument index for a treatment plant upgrade so the contractor and integrator read it the same way?
What they are checking: Whether their drawings and lists are clear enough to bid and build from without endless RFIs.
What's your approach to making minor changes to someone else's PLC and HMI programming when the original documentation is thin?
What they are checking: Whether they work carefully and verify behavior before editing code they did not write.
How would you choose between a magnetic flow meter and an ultrasonic meter for a wastewater influent line?
What they are checking: Whether they pick instruments based on the process fluid, piping and maintenance reality rather than habit.
Describe how you design control strategies for a lift station so it handles high flow events and pump failures safely.
What they are checking: Whether they plan for alarms, redundancy and failure modes, not just normal operation.
How do you think about cybersecurity when you're designing or expanding a utility's SCADA network?
What they are checking: Whether they understand that water systems are critical infrastructure and design network access with that risk in mind.
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