By the Peoria AZ Plumbing Co team · Published 2026-09-04 · Updated 2026-09-19
If your property has a sump pump, whether for a below-grade garage, a low-lying yard, or a spot that has pooled during a past storm, test it before monsoon season rather than during the first real storm of the year. Check that the float switch moves freely, confirm the discharge line is clear and routed away from the foundation, and verify a battery backup is charged and actually functional, since monsoon storms frequently knock out power at exactly the moment a pump is needed most.
Dealing with this right now? This guide covers the background. For the actual repair, our Sump Pump Service page has what to expect from a visit, or call (623) 323-3182 to talk it through directly.
Testing the float switch properly
Pour water into the sump pit until the float rises enough to trigger the pump, and confirm it activates promptly and pumps the water down before shutting off cleanly. A float that is stuck, whether from debris in the pit or a mechanical issue, means the pump will not activate no matter how much water accumulates, which defeats the entire purpose of having one installed.
Clear any debris from the pit itself while you are testing, since debris is a common cause of both float sticking and impeller jamming during actual use.
Checking the discharge line
Follow the discharge line from the pump to where it exits the property and confirm it is clear of obstructions and actually directs water well away from the foundation rather than looping back toward the house. A blocked or poorly routed discharge line can mean the pump runs constantly without actually solving the flooding problem it exists to prevent.
If the discharge line has never been checked since installation, this is worth doing even on a pump that has seemed to work fine, since a slow blockage can develop gradually without an obvious symptom until a major storm reveals it.
Why the battery backup matters specifically here
Monsoon storms in the Peoria area often bring both heavy rain and power outages together, which is precisely the scenario where a pump running only on grid power fails at the worst possible moment. A battery backup keeps the pump operating through exactly the conditions it was installed to handle.
Test the backup by disconnecting grid power briefly while the pump is running to confirm it switches over smoothly, rather than assuming a battery that has sat untested for a year will perform correctly when it matters.
What a professional check adds
A plumber testing your sump pump system checks the same fundamentals, float switch, discharge line, and backup power, but also assesses whether the pump itself is still correctly sized for your property's actual drainage needs, which can change if landscaping or grading has shifted since installation.
If you have never had a sump pump installed but have experienced pooling during a past monsoon storm, that history is worth mentioning to a plumber, since it may indicate a real need rather than something to keep managing reactively each storm season.
The bottom line
A sump pump that has never been tested is a pump you cannot actually count on, regardless of how confident you feel about it sitting quietly in the pit.
Doing this check before the season's first real storm, rather than after a scare, is the entire point of a seasonal checklist rather than reactive troubleshooting.
What to do if the pump fails during a storm
If a sump pump fails during active flooding, prioritize safety over the equipment itself: avoid entering a flooded area with electrical equipment present, and call for emergency water extraction rather than attempting to troubleshoot the pump mid-storm.
Once the immediate water is addressed, a plumber can diagnose why the pump failed and whether it needs repair, replacement, or simply a correctly functioning battery backup for next time.
| Check | What you're confirming |
|---|---|
| Float switch moves and triggers pump | Pump will actually activate when water rises |
| Discharge line clear, routed away | Water is actually being removed, not recirculated |
| Battery backup charged and tested | Pump works through a power outage |
| Pit free of debris | No jam risk during actual use |
Frequently asked questions
How often should I test my sump pump?
At least once a year, ideally before monsoon season begins, since a pump that sits unused most of the year can fail silently between tests.
Do I actually need a battery backup, or is grid power enough?
In a climate where storms and power outages often happen together, a battery backup is worth having specifically because it covers the exact scenario where grid-only power would fail you.
My yard pooled once during a storm. Does that mean I need a sump pump?
It is worth having assessed. A single pooling event could be a one-time drainage issue or a sign of a genuine low point on your property that would benefit from a properly sized pump.
Can I test the pump myself without professional help?
Yes, pouring water into the pit to trigger the float and checking the discharge line are both reasonable DIY checks. A professional assessment adds sizing and system-condition evaluation beyond the basic function test.
What is the lifespan of a typical residential sump pump?
Many residential sump pumps last several years with proper maintenance, though the exact interval depends on usage frequency and water conditions. Annual testing is what actually reveals when a unit is nearing the end of its useful life.
Is a battery backup a separate purchase from the pump itself?
Yes, in most cases. A battery backup system is typically an add-on component installed alongside a primary sump pump, sold separately, and it can often be added to an existing pump that did not originally include one, making it a reasonable upgrade even for a system already in place.
Should I run my sump pump periodically even outside of monsoon season?
A brief test every few months, not just before monsoon season, helps catch a developing issue earlier and keeps the pump's moving parts from sitting completely idle for extended stretches of the year.
Is a check valve part of a standard sump pump installation?
Yes, a check valve on the discharge line prevents water from flowing back into the pit after the pump shuts off, and it is worth confirming yours is present and functioning as part of any seasonal check.
Does homeowners insurance typically cover sump pump failure damage?
This varies significantly by policy, and some insurers offer a specific sump pump failure endorsement as an add-on, so checking your specific coverage before monsoon season begins is worth doing alongside the physical equipment check.
Reviewed by the Peoria AZ Plumbing Co team. Our work follows the International Plumbing Code (IPC) and the International Fuel Gas Code (IFGC) as adopted regionally, plus the permit and inspection requirements of the City of Peoria and Maricopa County.