Appearance on this list is not to be construed as an endorsement by
any regulatory agency nor is it any guarantee of the performance or
the method or equipment. Equipment should be installed and operated
in accordance with all applicable laws and regulations.
This list of Leak Detection Evaluations was
prepared by a work group consisting of State and EPA members and is
limited to evaluations of leak detection equipment and procedures,
or systems conducted by an "independent third-party evaluator" (see
the Glossary page)
and reviewed by the work group. This list includes evaluations
conducted in accordance with either EPA Standard Test Procedures
for Evaluating Leak Detection Methods (EPA/530/UST-90/004
through 010) or
other test procedures accepted by the NWGLDE as equivalent to the
EPA standard test procedures (see the
The National Work Group on Leak Detection
Evaluations (NWGLDE) does not guarantee the performance of any leak
detection method or equipment appearing on this List, nor does it
warrant the results obtained through the use of such methods or
The NWGLDE does
not evaluate methods or equipment and appearance on this List does
not mean they are automatically acceptable for use in any
particular state or local jurisdiction.
The NWGLDE List is
not an EPA List, nor does appearance on this list constitute
endorsement or approval by the NWGLDE or EPA. Anyone claiming that
a device or method is “EPA approved” because it appears on this
list is making a false claim.
The NWGLDE makes
no representations concerning the safe operation of any method or
equipment. All users of any method or equipment appearing on this
List must assume full responsibility for the proper and safe
operation of said equipment and assume any and all risks
associated with its use.
On each data
sheet, this List reports parameters and data values for methods,
equipment, and software that are specific to the most current
third-party evaluation submitted to the NWGLDE. Subsequent
modifications or changes to the method, equipment, or software may
produce parameters and data values that are significantly
different than the listed third-party evaluation parameters and
data values. It is the responsibility of the local implementing
agency to accept or reject those modifications or changes.
NWGLDE Listings apply to leak detection functionality only and not material compatibility. Since long term material compatibility with the product stored is not addressed in test procedures and evaluations, the NWGLDE makes no representations as to the compatibility of leak detection
equipment with the product stored.
Unless specifically indicated on the individual
data sheets, performance with alternative fuels has not been
the following exception:
Biodiesel B6 through B20 meeting ASTM D7467 and biodiesel B100
meeting ASTM D6751
may be used with all equipment listed for diesel whether or not these alternative fuels are included on
individual data sheets. This exception DOES NOT APPLY
to leak detection test methods using Out-Of Tank Product Detection (Vapor Phase) for B6-B20, and Out-Of Tank
Product Detection (Liquid and Vapor Phase) and any tracer-based
test methods for B100. For these methods, individual data
sheets will have to be referenced to determine applicability.
- Measurements derived for minimum detectable water level and minimum water level change for automatic tank gauge method, continuous automatic tank gauge method, and certain non-volumetric tank tightness test method listings were calculated in 100% hydrocarbon fuels, unless otherwise noted.
- NWGLDE listed leak detection equipment may be applicable for use with additional liquids after consultation with the manufacturer and/or third party evaluator and subject to approval by the implementing agency.
- The work group will only review evaluations
of leak detection systems that monitor tanks or
piping systems in accordance with methods described in 40 CFR
280 or API 334. Systems that detect leaks in tanks or piping
systems utilizing a method described in a construction or repair
standard; such as PEI RP-100, PEI RP-200, API 653 or API 1631,
will not be reviewed. This includes testing performed as part of
the internal inspection and recertification of ASTs and
USTs, and pre/mid/post installation testing such as soap testing
or helium testing.
If you have any
questions about the NWGLDE Listing Content Disclaimer, Privacy
Policies, or have suggestions on how these policies can be improved,
please feel free to email us at