Sump Pumps · Maryland
Sump Pump Installation &
Service in Maryland
Your sump pump is the last line of defense against a wet basement. Most Maryland homes have one. Few have the right one.
Sump pump installation, replacement, repair, and battery backup — using commercial-grade Zoeller cast-iron submersibles, not the plastic units sold by national franchises. If your pump fails during a Maryland storm, the work we do fails with it.
Every Install
The Right Pump for Maryland Conditions
What Your Sump Pump Actually
Needs to Handle
Maryland's spring rainfall events can dump two to four inches in 24 hours. That's the load your sump pump was spec'd for when your house was built — except builder-grade plastic submersibles have a 10–15 year service life, and when they fail, they fail during the storms that need them most.
OBW specifies Zoeller cast-iron submersibles for every installation. Cast-iron construction handles higher sustained pump cycles without the heat buildup that kills plastic units. Commercial-grade components aren't proprietary — any qualified plumber can service or replace them, unlike the branded units sold by national waterproofing franchises.
Battery backup is not optional for Maryland homes. The storms that flood basements also knock out power. A battery backup system that runs for eight or more hours without grid power is the difference between a dry basement and a flooded one after a major storm event.
All Services
Sump Pumps
Services in Maryland
Every scope is written after a free inspection. No phone estimates, no commissioned salespeople.
Sump Pump Installation
New basin and Zoeller cast-iron pump installation. Sized for your specific basement volume and drainage load.
→Battery Backup Installation
Extended-runtime battery backup that keeps your pump running when the storm knocks out your power.
→Sump Pump Replacement
Replace a failed or aging pump with a properly-sized Zoeller unit. Most replacements complete in a single visit.
→Sump Pump Repair
Diagnose and repair failed pumps, float switches, check valves, and discharge line issues.
→Sump Pump Failure
What to do when your pump has failed and your basement is taking water — emergency response and replacement.
Warning Signs Your Sump Pump Needs Attention
Signs Your Sump Pump May Be
Failing or Undersized
Most sump pump failures are predictable and preventable. These are the warning signs.
- Pump runs constantly or cycles on and off rapidly — float switch or undersized pump
- Pump makes grinding, rattling, or humming noises without running
- Basement took water during a storm despite the pump being installed
- No battery backup — pump is useless during the power outage that accompanies most major storms
- Pump is more than 10 years old and has never been replaced or serviced
- Discharge line empties too close to the foundation — water recirculates back in
Sump Pump Questions
Common Questions About Sump Pumps
in Maryland
Call (410) 709-7166 for questions not listed here.
Why does OBW use Zoeller cast-iron instead of standard plastic pumps?
Cast-iron construction handles sustained high-cycle operation without heat buildup. Maryland spring events can run a properly-sized pump for 48–72 hours continuously. Plastic units overheat and fail under that load. Zoeller cast-iron has been the benchmark for residential and light commercial pump performance for decades — and since it's not a proprietary branded component, any qualified plumber can service it.
How long does a sump pump last?
Builder-grade plastic submersibles: 10–15 years under normal operation. Zoeller cast-iron submersibles: 15–25 years. Battery backup units: 3–5 years for the battery itself (the unit lasts longer with battery replacement). If your pump is approaching 10 years old and has never been replaced, it should be tested before the next Maryland spring event.
Do I really need battery backup?
In Maryland, yes. The storms that generate the most water infiltration — sustained spring events, tropical storm remnants, nor'easters — also knock out power. Without battery backup, your primary pump stops running at exactly the wrong moment. We consider it non-negotiable for Maryland homes in our flood-season service area.
My pump runs a lot but the basement stays dry. Is that normal?
Running frequently means your drainage system is working, but running constantly (never cycling off) means the pump is undersized for your water load or there's a check valve or discharge issue causing recirculation. We assess pump performance, basin size, and discharge routing during the free inspection.
70 Years of Maryland Basements
Why Maryland Homeowners Choose
Oriole Over National Brands
Three generations of the Pirog family since 1953.
No Commissioned Salespeople
Our inspectors diagnose accurately — not sell the largest system. Honest assessment every time.
Lifetime Transferable Guarantee
Transfers to the next homeowner. National franchise warranties don't.
Maryland Soil Expertise
Piedmont clay, Bay water tables, freeze-thaw. Engineered for Maryland specifically.
Family-Owned Since 1953
Amber Pirog leads the same family company Frank Sr. founded over 70 years ago.
Free Inspection. Written Quote. No Pressure.
Three Steps to a Dry,
Sound Maryland Home
From inspection to completed work, most OBW jobs are scheduled within two to three weeks.
Free Inspection
A local OBW inspector visits, assesses the problem, and documents the scope. Free, no obligation.
Written Quote Same Day
A specific, itemized quote before any work is scheduled — not a vague range over the phone.
Work & Warranty
OBW's own crew completes the work and hands you the Lifetime Transferable Warranty before leaving.
Your Pump Will Fail During a Storm. Replace It Before That Happens.
Free inspection. Written estimate same day. Zoeller cast-iron on every install.
Family-owned since 1953 · MHIC #4247 · Lifetime Transferable Guarantee