What crawl Space Drainage and Sump Pump Installation involves in Johns Island is the same as anywhere. What differs is the condition it is dealing with, and that is set by the ground the house sits on.
Water keeps coming back, so it needs somewhere to go rather than somewhere to sit.
Drainage and sump pump on lowcountry and coastal plain ground
Near Johns Island a sump is often working against a standing water level rather than an occasional event, and close to the coast that level can be tidally influenced. The system has to be sized for water that keeps arriving, and the discharge has to go far enough that it does not simply return.
In Johns Island the complication is the water table. It sits close enough to the surface that soil under a house can be saturated with nothing broken, so this work is usually dealing with moisture arriving from below rather than from a failure inside the house.
Johns Island at a glance
| County | Charleston County |
|---|---|
| ZIP | 29455 |
| Elevation | about 10 ft |
| Region | Lowcountry and coastal plain |
Named water nearby
- Bloody Dick Swamp (swamp)
- Isinglass Swamp (swamp)
- Bear Swamp (swamp)
- the Rantowles Creek (stream)
Signs you need this
- Water returns in the same place after every heavy rain
- A waterline or silt mark on piers or foundation walls
- Soil that stays soft or muddy long after the weather clears
- An existing pump that runs constantly or has stopped working
What the work involves
What is included on a typical Johns Island property:
- Assessment of water source, arrival points and low spots
- Perforated collection pipe in a gravel bed
- Sump basin set at the low point
- Sump pump sized to the space, with check valve
Why it is worth dealing with now
A crawl space problem in Johns Island is not self-limiting. The conditions that created it are still there, and they are still working.
The full method and the step-by-step for this work is on the Crawl Space Drainage and Sump Pump Installation page, and how it behaves across the state is on the Drainage and sump pump in South Carolina page.
Drainage and sump pump in Johns Island: common questions
Where does the discharge go on a Johns Island property?
Far enough from the foundation that the water does not track straight back in, to a point that is legal locally. Discharging beside the wall is the most common fault we find, and it is why some pumps run constantly.
Can grading fix it without installing a pump?
Sometimes, and it is checked first because exterior water is the cheapest to deal with. Where the water table itself rises into the space, as it can around Johns Island, it cannot.
My house is near Bloody Dick Swamp. Does that change anything?
It can. Being close to Bloody Dick Swamp usually means a higher water table and a longer wet season under the floor, so drainage and a properly sealed barrier matter more here than they would further from it.
Does being close to the coast make this worse?
It raises the water table and lengthens the wet season, which is why homes near Bloody Dick Swamp and the low ground around Johns Island tend to need drainage as well as a barrier.
Do you work outside Johns Island itself?
Yes. We cover Charleston County broadly, including Ravenel, Hollywood and North Charleston, and the rest of the Lowcountry and coastal plain of South Carolina.
Where should the sump pump discharge to?
Far enough from the foundation that the water does not track straight back in, to an discharge point that is legal where you live. Discharging next to the wall is the most common fault we find, and it is why some systems run continuously.
Drainage and sump pump near Johns Island
We cover Johns Island and the surrounding part of Charleston County. The same service in nearby towns:
Other crawl space services in Johns Island
Crawl Space Water Removal in Johns Island
Standing water pumped and extracted from under the house, then the saturated material taken out.
Crawl Space Structural Drying in Johns Island
Joists, girders and subfloor dried back to a measured target with air movers and dehumidification.
Crawl Space Mold Remediation in Johns Island
Contained removal of mold-affected material, HEPA cleaning, and the moisture source shut off.
Crawl Space Vapor Barrier Installation in Johns Island
Sealed polyethylene over the soil and up the piers, so ground moisture stops entering the space.
Crawl Space Wood and Subfloor Repair in Johns Island
Rotted joists, girders, rim joists and subfloor sections repaired or replaced once the space is dry.
Or see everything we cover in our Johns Island service area, and how this service works across the state on the South Carolina page.
Crawl Space Drainage and Sump Pump Installation in Johns Island
Call (888) 724-1354 and tell us your street and what the space looks like. We will tell you whether this is the right stage to start at.
Tell us what you are seeing under the house and we will tell you what it needs.