If you're dealing with standing water after storms that always seems to start at the same spot along one wall, Arrow Tight Waterproofing's Interior Drainage System specialists are ready to diagnose it right and fix it for good — not just patch the symptom.
📞 Call Now — Free Estimate
We size drain tile diameter and slope to your basement's actual perimeter footage and groundwater volume — undersized systems are a common reason DIY and budget installs fail within a few years.
Same crew handles the full job — cutting, excavation, pipe, and sump tie-in — no subcontracted handoffs.
You'll know the exact scope — partial wall or full perimeter — before you approve anything.
Every system ties into a sump pit sized for the drainage volume it's collecting, not an undersized pit left over from a prior install.
We diagnose before we quote, so the Interior Drainage System scope you approve is built around your property, not a generic package.
We saw-cut the slab perimeter, excavate to the footing along the affected walls, and install schedule 40 perforated drain tile in a gravel bed — capturing water at the source before it can rise above slab level.
The system routes to a properly sized sump pit with a dual-pump configuration for redundancy on higher-volume installations. Getting the sizing right up front is what keeps the system ahead of a heavy storm instead of behind it.
📞 Get a Free Quote →When only one or two walls show active water entry, we install a targeted section of drain tile rather than quoting a full-perimeter system you don't need.
This keeps cost proportional to the actual scope of your water problem, tying the partial run into your existing or a new sump. This is standard on every interior drainage job we run, not something we upsell separately.
📞 Get a Free Quote →A vapor membrane is installed along the lower wall as part of the drain tile system, directing any wall-face seepage down into the drainage channel rather than onto your floor.
This addresses both floor-level and lower-wall moisture in a single integrated system rather than two separate fixes. That's the calculation most budget drain tile installs skip, and it's usually why they back up.
📞 Get a Free Quote →New or existing sump pits are evaluated for capacity against the drain tile's expected flow rate — an undersized pit paired with a new drainage system just moves the bottleneck downstream.
We upsize or rebuild the pit as needed so the whole system, not just the pipe, is rated for your actual water volume. This is standard on every interior drainage job we run, not something we upsell separately.
📞 Get a Free Quote →The sump discharge is routed and graded to terminate at least 10 feet from the foundation, preventing water the drain tile just collected from simply working its way back toward the wall.
Freeze-prone runs receive a freeze-guard fitting so winter conditions don't compromise the system. Getting the sizing right up front is what keeps the system ahead of a heavy storm instead of behind it.
📞 Get a Free Quote →Call +1-866-476-1348 and tell us where along the wall or floor you're seeing water. That helps us determine whether a full-perimeter or partial-wall system fits your situation.
Inspections for Washington interior drainage jobs are typically scheduled within days, with installation following shortly after approval.
The technician measures the affected perimeter, checks your existing sump capacity, and quotes a fixed per-foot price for the scope needed.
Once approved, we cut, excavate, install the drain tile and sump tie-in, and finish with a written warranty on the completed system.
"Water showed up at the same spot along the back wall every time it rained hard. Full drain tile installation along that section tied into a new sump — hasn't shown up once since, through several heavy storms.System's kept up with everything so far."
"They actually calculated our drainage volume before sizing the sump pit, which the last company that quoted us didn't bother doing. System's kept up with everything so far, including one very heavy spring storm.Floor's stayed completely dry since."
"Only needed drainage along two walls, not the whole basement, and they quoted it that way instead of upselling a full-perimeter system we didn't need. Fair pricing and the fix has held completely.Exactly the system that section needed."
"Concrete cutting was noisy for about half a day but they used dust containment and cleaned up thoroughly. Drain tile and vapor membrane installed along the wall — floor's stayed dry since.Floor's stayed completely dry since."
Arrow Tight Waterproofing provides Interior Drainage System throughout Washington, DC, with regionally staged crews that keep response times short whether you're in Washington or a neighboring community.
