Flooded garages, basements, and equipment rooms can shut a business down and ruin inventory. New Pro installs and services commercial sump pumps and drainage across the Westside — with backup power so they run when the storm takes the grid. Flat-rate.
Written bySteven Lockhart
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Reviewed byMiguel Lopez, Owner & Licensed Plumber, New Pro Plumbing (CSLB #974600)
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Last reviewedJune 2026 · 6 min read
Quick Answer
A commercial sump pump and drainage system protects garages, basements, and equipment rooms from the flooding that closes a business and ruins inventory. New Pro installs and services commercial pumps sized to the water volume, with battery backup so they keep running when a storm cuts the grid — the moment they matter most. Flat-rate.
Commercial sump and drainage systems are flood insurance for the below-grade parts of a business. This page is part of our commercial plumbing coverage across West Los Angeles. Underground parking, basements, and equipment rooms in low-lying Westside areas can take on water in heavy storms or from a high water table, and the cost of that water reaching electrical or inventory is far higher than the system that prevents it. FEMA’s flood protection guidance makes the case for planning ahead.
A commercial sump and drainage system is the network of pits, pumps, and discharge piping that removes water from below-grade commercial spaces — parking, basements, and equipment rooms — before it floods them, typically with backup power for storm reliability.
A commercial pump has to handle commercial water volume. We size the pump (or pumps) to the expected inflow for the space and the storm conditions, because an undersized pump simply cannot keep up and the space floods despite it. And because the storms that bring water often cut grid power, we build in battery backup — the same lesson that makes backup the key upgrade on a residential sump pump, at commercial scale and stakes.
Where the water goes matters as much as the pump. Discharge must carry it well clear of the structure, not dump it next to the foundation to seep back in, and a check valve must keep it from flowing back into the pit. We test commercial systems before the rainy season — not during the first storm — so a stuck float or worn pump is found when it is a maintenance note, not a flooded equipment room.
We install and replace commercial sump pumps sized to the space and the expected inflow, set proper pits, add check valves, and route discharge well clear of the structure. The upgrade we recommend most is battery backup, so the system runs through the power outage a storm often brings.
For larger or critical spaces, dual-pump configurations provide redundancy — a second pump that takes over if the primary fails or cannot keep up. We design to the risk the space carries.
Below-grade space at flood risk? Let’s protect it before the rains.
Call (310) 663-7666A sump system that is not tested is a gamble. We test commercial systems before the rainy season — confirming the pump runs, the float works, the backup engages, and the discharge flows — so problems surface as maintenance, not as a flooded room mid-storm.
We fold this into a maintenance schedule for clients, alongside other commercial preventive work, so the protection is verified annually rather than assumed.
The Bottom Line
Flooding a below-grade commercial space closes the business and destroys inventory and equipment. New Pro installs and services sump and drainage systems sized to the real water volume, with the backup power that keeps them running when a storm cuts the grid, and tests them before the rains. Flat-rate.
If you have below-grade space — underground parking, a basement, an equipment or electrical room — in a low-lying area, or you have flooded before, likely yes. We assess the space, the water source, and the grading, and recommend plainly rather than selling a system you do not need.
To the expected water inflow for the space under storm conditions, not just the room size. An undersized pump cannot keep up with real storm volume and the space floods anyway. We calculate the inflow and size the pump — or pumps — to handle it with margin.
Because the storms that bring the water often cut the grid, and a pump without power cannot run — it fails at the exact moment it is needed. Battery backup keeps the system running through an outage. For a commercial space protecting inventory or equipment, it is essential, not optional.
A dual-pump configuration adds a second pump for redundancy — it takes over if the primary fails or cannot keep up with a heavy inflow. For larger or critical spaces, like equipment or electrical rooms where flooding is catastrophic, the redundancy is worth it. We design to the risk the space carries.
Before each rainy season, at minimum. We confirm the pump runs, the float works, the backup engages, and the discharge flows clear. Testing in advance turns a stuck float or worn pump into a maintenance note instead of a flooded room during the first storm.
It must be routed well clear of the structure, not dumped next to the foundation where it seeps back in, with a check valve to stop backflow into the pit. Proper discharge routing is as important as the pump itself — we handle both as part of a sound installation.
This page was written by the New Pro Plumbing content team and reviewed for technical accuracy by Miguel Lopez, owner and California-licensed plumber (CSLB #974600). Guidance follows U.S. EPA, U.S. Department of Energy, and California agency sources where cited. Any figures reflect New Pro Plumbing's typical practice and West Los Angeles conditions, not a quote — we confirm pricing in writing before any work begins.
What’s new: June 2026 — first publication.
Flooded garages, basements, and equipment rooms can shut a business down and ruin inventory. New Pro installs and services commercial sump pumps and drainage across the Westside — with backup power so they run when the storm takes the grid. Flat-rate.
