Radon Mitigation System
with a Sump Pit

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A radon mitigation system that utilizes a sump basin and drain tile is usually a great method for radon reduction. Here are some things to consider:

You need to have a strong cover, that can be sealed.
If you have a pump it needs to be a submersible type for proper sealing.
Do you have water that flows into the basin when it rains or if you have other appliances draining into the sump? You will want a special sump cover drain. These allow water down but stops air draw from the house.
If you have any untrapped drains using the sump these will have to be retrofitted.
A good design will allow for easy access to the sump basin by using an inspection plug. Otherwise the whole cover will have to be removed.

This cover shows a cord seal, 2" Uniseal for the sump discharge and a removable inspection plug for access to the sump after the lid is secured and sealed.

To attach a radon vent pipe to this cover either of the two PVC coupling set ups could be used.

For 4" pipe make a 4-1/2" hole in the cover. The short piece of pipe will slide into the top of the cover and held from slipping into the basin by the 5" diameter coupling. A small amount of silicone is used to seal around the coupling for an air tight fit.

For 3" pipe a 3-1/2" hole is required.

Radon sump system

Here is an installed lid. All sealing is done with silicone caulk for easier removal. The discharge pipe for the sump pump is 1-1/2". We used a 2" Uniseal and filled the gap with silicone. A label should be fixed to the cover to note that the sump is part of the radon mitigation system. The suction pipe for the radon fan was located over the drain tile about 20 feet away. This was closer to exit point from the basement than the sump. The radon level in this home was reduced from 64 pCi/L to 1.3 pCi/L. Very effective!!

Learn more about radon mitigation and sumps...

Lexan Sump Cover

Lexan can be easily cut with a jig saw to fit any diameter sump crock. See more sump cover options at the bottom of this page.

16" x 16" x ¼" Lexan......$29.95
24" x 24" x ¼"Lexan.......$44.95

Rubber Pipe Seals

Use pipe seals for discharge pipe that pass through the Lexan cover.
If the seal doesn't fit tightly around the pipe, use silicone to seal the gap.

Here's what I recommend:

2" for 1½" PVC discharge
1½" for 1¼" PVC discharge
1¼" for 1" and smaller copper pipe
Cord seal can be cut for special sizes and extra cords

2" Uniseal...........$5.95
1½" Uniseal...........$5.45

1¼" Uniseal...........$5.25
Cord Uniseal ...........$5.95

Inspection Plug

Use to allow easy acess to your sump pump.
Installs in a 4" diameter hole.

4" Inspection Plug .....$8.99

5" Lexan Cover For Black Lids

I use these 5-1/2" x 5-1/2" covers for non see through lids. I cut about a 4-1/2" hole, use a little silicone and 4 screws to attach. They allow for easy viewing and access to the pump. Comes with a hole drilled in each corner and screws. 1/4" thick.

5-1/2" Lexan cover .....$3.95

Sump and Floor Drain Retofits

Drain for the sump cover. Allows water to drain down but stops air from being pulled out of the building by the radon fan.

Dranjer J-S5 .....$28.95

Use to fix a floor drain with no trap.

Dranjer F-R2 .....$29.95

More Radon Sump Cover Options

Heavy duty molded ABS plastic sump pit cover with a strong center support brace. Cover is .187" thick and is 24" OD and 3" high which will cover most sumps. Cover separates into 2 parts which can allow for installation without pump removal. This cover needs to be screwed to the floor. Instructions are included.

Dome Sump Cover .....$89.95

Solid 3/16" x 21" Black ABS Cover

This cover can be cut easily with a jig saw to fit your sump's diameter.

Solid ABS Sump Cover .....$32.95

Pededtal Sump Cover

Great for pedestal type pumps or when backup pumps get in the way of a flat cover. The view panel is removable for easy access to your pump and should allow for pump replacement without removal of the entire cover.

The door panel is black ABS plastic. A 5-1/2" Lexan view port is recommended for the unit's top to monitor water levels. See these further up on this same page.

High rise cover measures 22" high by 21" wide.

Pedestal Sump Cover .....$109.95

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Radon Mitigation System with a Sump Pit