Sump pumps and crawl space water
When water has already reached the crawl space, it needs a way out. Here's how sump systems work and what to look at first.
Many of Hattiesburg's older homes, including bungalows and cottages in the neighborhoods around downtown and the university, sit on piers over a crawl space. When the yard outside stays soaked, water can wick through the block foundation wall or pool on the dirt floor, and with no lower point to go to, it stays. A sump pit at the low spot, with a pump and a discharge line, lifts that water out and sends it away from the house.
Why start outside?
A pump treats the symptom. If gutters overflow, downspouts empty against the foundation or the yard tilts toward the house, fixing those can cut the water under the floor dramatically, sometimes enough that no pump is needed. A good contractor looks at the roof drainage and grade before recommending equipment.
What goes into a typical system?
- A perimeter or interior drain that steers water to the pit
- A lidded pit and a pump sized to the water you actually get
- A check valve and discharge line that releases water well away from the house
- A dedicated outlet, and possibly a battery backup or high-water alarm
Signs of a water problem under the house
- Puddles or mud on the crawl space floor after storms
- A musty smell inside, worse on humid days
- Sagging, wet insulation or rusty ductwork and straps
- Water lines or white mineral crust on piers and block walls
Water versus humidity
South Mississippi summers are long and humid, so crawl spaces pick up moisture even without standing water. Drainage removes liquid water; a ground vapor barrier, and in some houses sealing and dehumidifying the crawl space, handle damp air. Ask whether your house needs drainage, moisture control or both, and which contractor handles each.
Wiring, permits and discharge
Ask who does the electrical work for the pump and whether a permit is needed. Inside Hattiesburg, the city says altering an existing residence generally requires one. Ask where the discharge ends: not back against the foundation, not onto a neighbor's lot and not into a sewer line.
No two yards are priced the same. A contractor has to walk the lot, check the fall to an outlet and see what the soil is doing before giving a number, so we don't list prices here. Any figure offered over the phone without a visit is a rough guess at best.
Where we connect you with help
Common questions
Is a vapor barrier enough?
Not if water is pooling. A vapor barrier slows moisture from the soil but doesn't remove standing water. Most wet crawl spaces need the water dealt with first.
How do I test my sump pump?
Pour a bucket of water into the pit and watch it switch on and empty. If it hums without pumping or runs constantly, have it checked.
Related services
More background: Pine Belt drainage guide.
Back yard still squishy two days after the rain quit?
Call and a drainage contractor who works the Pine Belt will come see where the water collects and where it can safely go.