LEHI SEWER EJECTOR PUMP — WALKOUT BASEMENTS THAT STAY DRY

Lehi has more walkout basements than most cities we work in. Bench-side homes — Traverse Mountain, Skye Estates, Suncrest-adjacent slopes, parts of Cold Springs Ranch — are built into hillsides with a daylight wall on one side and three buried walls. The walkout side opens to grade; the buried sides have basement-level fixtures (bathroom, laundry, wet bar, sometimes a full kitchenette in an ADU configuration) that sit below the elevation of the city sewer main running in the street. Gravity won't move waste from a below-grade fixture up to a city main. An ejector pump will.

An ejector pump handles raw sewage — solids, toilet paper, grey water, everything. That's what separates it from a sump pump (clean ground water only) and from a lift station (municipal-scale volume). The pump sits in a 30-40 gallon polyethylene or fiberglass basin in the slab or tucked into a utility room. A sealed lid with a vent contains sewer gas. A float switch tells the pump to run when waste rises. A check valve on the discharge keeps already-pumped waste from draining back when the pump shuts off.

When Lehi homes need one

• Walkout basement bathroom or wet bar — Traverse Mountain, Skye Estates, Cold Springs Ranch, the upslope end of Holbrook Farms
• Basement laundry stack added below the main floor drain line during a finish-out
• Garage utility sink sitting lower than the house sewer
• ADU or mother-in-law apartment finished in a basement or walkout — common in Lehi where bigger lots accommodate them
• Replacement of a failed pump — ejectors last 7-12 years residential, and the earliest Traverse Mountain builds are now hitting that window
• Tech-campus ADU rentals — short-term and mid-term rentals run higher fixture cycles than owner-occupied basements

The three pump types we install

Simplex ejector. Single pump, single float, single basin. Standard owner-occupied install — one walkout bathroom, one pump, one line up to the house main. Usually 1/2 HP with 2-inch discharge. Lifespan: 7-10 years. Cost: $1,950-$3,400 installed.

Duplex ejector. Two pumps in the same basin alternating on each cycle so wear is shared and one is always backup. Goes into rental properties (common at Traverse Mountain ADUs and Holbrook Farms basement apartments), small commercial, and any install where pump failure means the homeowner is dealing with sewage before the plumber arrives. Costs more upfront but cuts downtime risk in half. Cost: $3,400-$6,200 installed.

Grinder pump. Rotating cutter impeller chops solids — flushable wipes, feminine products, dental floss, anything a standard ejector might bind on — into slurry before pumping. More expensive, more cutter wear from fibrous material, but right on installs with renters, kids, or commercial traffic. Required when discharge runs over 150 feet or has multiple elevation changes. Cost: $2,800-$5,400 installed.

Why Lehi installs have specific failure modes

Two factors show up repeatedly. First: hard water mineral buildup on float switches. Lehi's Jordan Valley aquifer water has the highest hardness in our service area, and the waste in an ejector basin carries dissolved mineral content. The vertical float shaft develops scale coating over 3-5 years that prevents the float from sliding freely. Symptom: pump runs constantly or fails to trigger. Fix: switch to a pressure-sensor float, or schedule annual descale on the existing float. Tech-savvy Lehi customers can monitor pump cycle counts via Home Assistant integration on the alarm circuit — we set that up for QSC members on request.

Second: freeze damage on discharge lines. A below-grade ejector discharge running up through an exterior wall to an above-grade tie-in can freeze in a Traverse Mountain February if the wall is poorly insulated or the discharge runs through unheated space. Symptom: pump runs but no waste reaches the main. Fix: re-route through conditioned space, or insulate and heat-trace the line. Bench-side Lehi homes are colder than valley-floor homes by 5-8 degrees on average, which matters here.

What we do on a Lehi ejector install

Plan review first — fixture count, waste output calc, discharge lift height, run length, code compliance check for Lehi city plumbing code. We pull the permit, size the pump and basin correctly for the application, run the 1.5-inch or 2-inch discharge through conditioned space, install the check valve and gate valve, wire to a dedicated 20-amp circuit with GFCI protection, install the sewer gas vent tied to an existing plumbing vent or run a separate through-roof vent (HOA approval pulled where required for visible roof penetrations), and install an audible/visible alarm on the basin.

On replacements, we diagnose the failure (float, motor, check valve, discharge line, basin seal), quote the right repair vs. replace decision, and pull the permit if basin or discharge is being modified. Old pump pulled, basin cleaned, new pump dropped in, float adjusted, system cycled and confirmed before we leave.

Annual service visits are available on the $79/year Quality Service Club membership — worth it for Lehi rentals, ADUs, or high-traffic basement bathrooms. Annual check includes pump cycle test, float free-movement verification, alarm test, discharge line flush, and basin cleaning. For tech-savvy customers, we'll also push pump-status data to your Home Assistant or SmartThings install.