Submersible vs. Jet Pumps: Which Does Your Tompkins County Well Have?

Well pumps come in two fundamentally different designs, and knowing which one your system has changes what a repair, replacement, or even a routine inspection actually looks like. Across Tompkins County, which type shows up on a given property tends to track the local geology almost as much as it tracks the age of the system.

How each type actually works

A submersible pump is a sealed unit lowered directly into the well, sitting below the water level, where it pushes water up to the surface under pressure. A jet pump stays above ground — usually in a basement, crawlspace, or small well house — and uses a suction mechanism to draw water up through a pipe from the well below. The names describe exactly where each pump physically lives relative to the water it's moving.

Telling them apart at a glance

The clearest sign is what's visible above ground. If there's a pump housing sitting in a basement or utility space, connected to a pipe running out to the wellhead, that's a jet pump. If the wellhead is simply a capped pipe protruding from the ground with nothing else visible nearby, the pump is almost certainly submersible, sitting down inside the casing itself. Well depth is a second clue: jet pumps generally aren't practical much past about 25 feet of vertical lift, so a well drilled deeper than that is very likely running a submersible unit.

Why geography matters here

Wells drilled into the deeper, glacially-carved deposits near Cayuga Lake — common across Lansing and the lower-elevation parts of the Town of Ithaca — tend to run deep enough that submersible is the practical and standard choice. It's also simply become the default for new residential wells generally, since submersible units run more efficiently and are better protected from winter freezing than an above-ground jet pump. Older installations, and some of the shallower wells scattered through the county's hill towns, are more likely to still have an original jet pump in place. See our well depth and geology guide for how depth and geology vary town by town.

Does the type change how repairs happen?

Yes, meaningfully. A submersible pump problem often requires pulling the entire unit up on its drop pipe to inspect or test it, since there's no above-ground component to check directly — that adds labor and, on a deep well, real time to the process. A jet pump can usually be inspected and tested in place, which sometimes makes early diagnosis quicker, even though the underlying failure points — motor wear, impeller damage, wiring, priming issues — are broadly similar between the two designs. See well pump repair for the symptoms that apply regardless of which type you have.

Can a jet pump be converted to submersible?

In some cases, if the well's casing and depth support it — but it's a genuine project rather than a simple swap, typically involving new drop pipe and wiring run down into the casing, not just a replacement of the above-ground unit. Whether it's worth doing depends on the well's condition and what the household actually needs. This is a conversation worth having as part of a replacement request rather than something to plan around in advance.

A note on shallow wells and convertible jet pumps

Some jet pump systems are designed specifically for shallow wells and use a single pipe down to the water source, while others — sometimes called convertible jet pumps — can be configured for either shallow or deeper wells using a different jet assembly. This distinction matters mainly if a jet pump is being replaced, since matching the new unit's configuration to the well's actual depth is part of getting the replacement right the first time. It's also a reason why a straightforward-seeming jet pump swap still benefits from an actual look at the well rather than treating it as a like-for-like parts replacement.

What this means for cost and service calls

Submersible pump service tends to involve more labor for anything requiring the pump to be pulled, which is reflected in how that kind of job gets scoped. Jet pump service is often more contained, though sizing and priming still have to be matched correctly to the specific well. Either way, mentioning which type you have — or what's visible at your wellhead — when you request service helps route the job accurately from the start.