Standing water and crawl space drainage

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Water first, then everything else

Chattanooga gets about 55 inches of rain a year, with 83 days of at least a tenth of an inch (NOAA 1991-2020 normals). If rain water reaches the crawl space, a liner or dehumidifier alone won't keep it dry. That's the question behind a local homeowner's two quotes: about $7,500 for encapsulation and a dehumidifier, and $12,500 with drainage and a sump pump added.

Start outside

UT Extension's advice for crawl space homes: the finished grade should slope away from the foundation so water doesn't collect under the house. Check that gutters and downspouts carry water well away from the foundation. HomeGuide's ranges for these fixes:

Angi's range for crawl space drainage systems is much wider, $1,500 to $15,000, and it notes drainage upkeep of $500 to $800 every 5 to 10 years. A pedestal sump pump costs $60 to $170 and a submersible one $100 to $400 for the pump alone (Angi).

Tell the source of the water

• After heavy rain only: usually surface water. Check gutters, downspout extensions and grading first.
• Always damp, no puddles: often ground moisture or humid air; see vapor barrier and dehumidifier.
• Wet in one spot, even in dry weather: look for a plumbing leak, and fix it now. The EPA says wet materials should be dried within 24 to 48 hours.

What to ask

• Where does the water come in, and why will this fix stop it?
• Where does a sump discharge, and what happens in a power outage?
• Is outside work (gutters, grading) in the quote, or should you hire that separately?
• If you're also quoted encapsulation, can it wait a season to see if drainage alone is enough? Our drainage-first guide goes deeper.