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Sump Pump Cover Gasket


Sump pump covers mechanically attached with full gasket seal or equivalent
Sump pump covers mechanically attached with full gasket seal or equivalent

Select and install sump pumps that have tight-fitting lids with gaskets and mechanical fasteners.

See the Compliance Tab for related codes and standards requirements, and criteria to meet national programs such as DOE’s Zero Energy Ready Home program, ENERGY STAR Certified Homes, and Indoor airPLUS.


Water management strategies that help remove excess water from the foundation often include the installation of a reservoir called a sump in the basement or crawlspace of the home. For more information about drains and sumps see the guide Drain or Sump Pump Installed in Basements or Crawlspaces. The sump is generally a small pit (also called a crock or vault) that extends through the slab into the ground below and provides a drainage place for excess water. 

When building a home, the best way to protect the foundation from moisture issues is with proper site grading, installation of gutters and downspouts, and installation of exterior footing drain pipe that drains to daylight, a drywell, or a storm sewer. When renovating a house that has evidence of water issues, if it is not feasible to construct an exterior drainage system, drain pipe can be installed along the interior footing that drains to a sump pump, which collects the water and sends it to the storm water, sewer, drywell, or other approved location. Even if there is no sign of water intrusion in retrofit or new construction, a sump pit is sometimes installed in the basement floor slab as a precaution; then, if there are future changes in ground water levels, a pump can be installed in the sump pit (Ueno and Lstiburek 2010). 

The sump pit should be covered with a gas-tight lid. While sump pumps are very effective in removing water, if they are not covered and installed properly, they can create additional water management issues, as well as indoor air quality concerns for the house. Sumps usually have standing water. If the sump pit is open or has a loose-fitting lid, this water can evaporate into the air, raising the relative humidity inside the home, basement, and crawlspace. This can encourage the growth of mold, which is a health concern, and can increase the moisture level of wood framing, inviting fungal decay and wood-eating pests. 

Uncovered or improperly sealed sump pumps can also allow radon and other soil gases to enter the basements and crawlspaces and then mix with air inside the home (EPA 2012). Radon is a naturally occurring radioactive, carcinogenic gas found in varying levels in the soil and air. In high-radon areas, if soil gases are allowed to enter the home, radon can accumulate inside the home in potentially toxic levels (EPA 2001). See Approved radon-resistant features installed in Radon Zone 1 homes for more information on radon and ways to reduce radon accumulation in homes.

The 2009, 2012, and 2015 IRC require that any sumps pumps that are installed have a gas-tight, removable cover. ENERGY STAR Certified Homes Version 3.0, Revision 08, requires the sump lid to be mechanically attached and that the sump be fitted with a full gasket seal.

An open sump pump can allow unwanted moisture into the basement. The opening is also a source for radon to enter the home
Figure 1. An open sump pump can allow moisture, soil gases, and radon to enter the home.  

How to install a sump pump cover

  1. Install the electric sump pump to manufacturer's specifications, making sure the float is unobstructed. Installation of the pump should happen after the home's electric meter has been set. This will allow you to test the pump and ensure it is operating properly and discharging water as intended. 
  2. Select a sump pump model with a cover that is tight fitting and that seals the entire surface of the crock or vault. Sump covers should be made of durable plastic or other rigid material and designed for air-tight sealing with a built-in gasket. Select a sump pump with a lid that has built-in air-sealing grommets around all penetrations for electrical wiring, water ejection pipes, or radon vent pipes.
  3. Mechanically fasten the cover in place with screws or other means that will maintain tight contact between the lid, the gasket, and the rim of the crock. Sump covers that permit observation of conditions in the sump pit are recommended. If the sump is installed in a concrete slab, caulk around the outside edge of the vault where the vault meets the concrete (EPA 1994). If the sump is installed in a crawlspace with a dirt floor covered by a polyethylene vapor barrier, ensure that polyethylene covers the ground around the sump pump and is taped to the rim of the vault.
Properly sealed sump pump
Figure 2. This sump pump is properly sealed with a mechanically fastened, gasketed lid.  


Sump pump functions
Figure 3. A sump pump is installed in the basement slab to pump away water that collects in the foundation drainage system. The sump has a tight-fitting cover to keep soil gases and water vapor from entering the basement. 


Ensuring Success

In areas where radon is a known specific threat to air quality (i.e., EPA Radon Zone 1 areas), an important part of the radon mitigation strategy is a sump pump cover that is mechanically attached with a full gasket seal. After the sump pump has been installed, complete radon testing to ensure that the cover is sealed and not allowing any radon into the living space.


No climate specific information applies.


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The Compliance tab contains both program and code information. Code language is excerpted and summarized below. For exact code language, refer to the applicable code, which may require purchase from the publisher. While we continually update our database, links may have changed since posting. Please contact our webmaster if you find broken links.

DOE Zero Energy Ready Home

The U.S. Department of Energy (DOE) Zero Energy Ready Home National Program Requirements requires (Exhibit 1, and 6) that all homes meet ENERGY STAR Certified Homes Version 3 or 3.1 and the U.S. Environmental Protection Agency Indoor airPLUS Construction Specifications 

EPA Indoor airPLUS 

The U.S. Environmental Protection Agency (EPA) Indoor airPLUS Construction Specifications requires homes to meet the ENERGY STAR Certified Homes requirements. Additional requirements include the following.  

  • Install a drain or sump pump in basement and crawlspace floors, discharging to daylight at least 10 feet outside the foundation or into an approved sewer system.

Exception: In areas of free-draining soils identified as Group 1 (Table R405.1, 2009 IRC) by a certified hydrologist, soil scientist, or engineer through a site visit – installation of a drain or sump pump is not required.

ENERGY STAR Certified Homes

ENERGY STAR Certified Homes (Version 3/3.1, Revision 08), Water Management System Builder Requirements

1. Water-Managed Site and Foundation:

1.7 Sump pump covers mechanically attached with full gasket seal or equivalent.

Builders Responsibilities:  It is the exclusive responsibility of builders to ensure that each certified home is constructed to meet these requirements. While builders are not required to maintain documentation demonstrating compliance for each individual certified home, builders are required to develop a process to ensure compliance for each certified home (e.g., incorporate these requirements into the Scope of Work for relevant sub-contractors, require the site supervisor to inspect each home for these requirements, and / or sub-contract the verification of these requirements to a Rater). In the event that the EPA determines that a certified home was constructed without meeting these requirements, the home may be decertified. 

ENERGY STAR Revision 08 requirements are required for homes permitted starting 07/01/2016.

2009, 2012, 2015, and 2018 IRC

Chapter 30 Sanitary Drainage, Section P3007 Sumps and Ejectors, The sump pump should have a gas-tight removable cover.
Chapter 33 Storm Drainage, Section 3303 Sumps and Pumping Systems – the sump pump should be at least 18 inches wide by 24 inches deep, located at a depth so that all drainage flows into it by gravity, made of tile, steel, plastic, cast-iron or concrete and have a removable cover.

Retrofit: 2009, 2012, 2015, and 2018 IRC

Section N1101.3 (Section N1107.1.1 in 2015 and 2018 IRC). Additions, alterations, renovations, or repairs shall conform to the provisions of this code, without requiring the unaltered portions of the existing building to comply with this code. (See code for additional requirements and exceptions.)

Appendix J regulates the repair, renovation, alteration, and reconstruction of existing buildings and is intended to encourage their continued safe use.

This Retrofit tab provides information that helps installers apply this “new home” guide to improvement projects for existing homes. This tab is organized with headings that mirror the new home tabs, such as “Scope,” “Description,” “Success,” etc. If there is no retrofit-specific information for a section, that heading is not included.

If the home has a sump pump, it should be equipped with a gasketed, tight-fitting lid to keep radon, other soil gases, and water vapor from entering the basement or crawl space, as described in the Description tab. If the lid is missing, one can be purchased from the sump pump manufacturer, from most hardware stores, or from plumbing supply stores. The sump may be used to collect water flowing across the crawlspace or basement floor in case of intermittent flooding events. The preferred method is to use a low-point drain rather than an open sump pit to collect surface water. The water is then piped underground from the drain to the sump pit and enters the pit from the side, below ground, so that the top of the pit can be continually covered by an air-tight solid cover.

See the Description tab and these Building America Solution Center guides for additional guidance on sump pumps.

If any standing water, mold, rotten wood, or hazardous materials are present in the crawlspace, consider addressing these conditions when addressing the sump pump. See the following Building America Solution Center guides for more information:

The U.S. Department of Energy’s Standard Work Specifications has additional information on sump pumps and worker safety in crawl spaces.

See Complaince tab. 

More Info.

Access to some references may require purchase from the publisher. While we continually update our database, links may have changed since posting. Please contact our webmaster if you find broken links.

Case Studies

None Available

References and Resources*

  1. Author(s): U.S. Environmental Protection Agency
    Organization(s): EPA
    Publication Date: April, 2001

    Document detailing how to build radon-resistant homes.

  2. Author(s): Ueno, Lstiburek
    Organization(s): Building Science Corporation
    Publication Date: January, 2011

    Report about the fundamental concepts that must be understood at the planning or initial nspection of existing homes regarding surface and ground water management.

  3. Author(s): Department of Energy
    Organization(s): DOE
    Publication Date: April, 2017

    Standard requirements for DOE's Zero Energy Ready Home national program certification.

  4. Author(s): U.S. Environmental Protection Agency
    Organization(s): EPA
    Publication Date: December, 2015

    Webpage with links to Document outlining the program requirements for ENERGY STAR Certified Homes, Version 3 and 3.1  (Rev. 08).

  5. Author(s): U.S. Environmental Protection Agency
    Organization(s): EPA
    Publication Date: January, 1994

    Standard providing information on contractors who offer radon control services to homeowners.

  6. Author(s): U.S. Environmental Protection Agency
    Organization(s): EPA
    Publication Date: October, 2015

    Website providing technical guidance to help home builders and their subcontractors, architects, and other housing professionals understand the intent and implementation of the specification requirements of the IAQ labeling program.

  7. Author(s): U.S. Environmental Protection Agency
    Organization(s): EPA
    Publication Date: February, 2011

    Guide describing details that serve as a visual reference for each of the line items in the Water Management System Builder Checklist.

Contributors to this Guide

The following authors and organizations contributed to the content in this Guide.

Last Updated: 07/25/2017