What matters for project planning
A standby generator is permanent equipment on a pad, so two things apply. Setting that pad is ground disturbance, which is what Naperville's land-disturbing permitting governs. More consequentially, where the parcel falls inside the DuPage County floodplain regulations the city has adopted, elevation of the equipment is a requirement rather than a preference — and getting it wrong means relocating a unit that has already been set, connected and commissioned. The on-site stormwater control facilities requirement matters mainly in that a pad should not be placed where it obstructs a route the site depends on.
Official sources
Check the parcel, not just the summary
A citywide summary cannot establish one parcel's floodplain status, soil type, or hidden construction. Confirm those specifics with the city and your chosen provider before work begins.
Sources reviewed 2026-07-26. Ordinances and flood maps get revised -- treat this as a starting point.