NSF/ANSI 240: Drainfield Trench Product Sizing

  • Overview
  • Benefits of Certification
  • Why Work With NSF?
  • Certification Process

NSF/ANSI 240 establishes minimum material, design, construction and performance requirements to evaluate dispersal drainfield products used as alternatives to traditional stone or gravel trenches. The test procedures emphasize hydraulics and measure performance over time in parallel comparisons between a conventional gravel drain field and a gravelless trench. The standard applies to both newer technologies, which are tested in a laboratory, and technologies in use for 10 or more years, which are evaluated in the field.

Benefits of Certification

NSF/ANSI Standard 240 was developed to reflect relevant industry needs and technologies through a consensus-based process with input from industry stakeholders.

NSF/ANSI 240 applies not only to new products but also to those that have been in use for 10 years or more.

Certification allows your company to:

  • Distinguish your product in the marketplace by demonstrating its performance through independent evaluation
  • Provide regulatory officials with a data-driven, third-party basis for approval
  • List your product and company in our online directory of certified treatment systems
  • Use the NSF certification mark on your systems and in your promotional materials

Why Work With NSF?

NSF International is a trusted leader in protecting public health, safety and the environment. We have been developing standards, performing laboratory testing and certifying products for nearly 70 years.

Our dedicated engineers and scientists possess extensive industry expertise and can solve even your most challenging analytical issues.

We provide a comprehensive package of product standards for the residential onsite wastewater community. In addition to NSF/ANSI Standard 240 for drainfield trench products, we also developed NSF/ANSI 46 for wastewater system components, NSF/ANSI 40 and 245 for residential wastewater treatment systems and NSF/ANSI 41 for non-liquid saturated treatment systems.

Products that comply with the requirements of the standard may use the NSF mark, one of the most recognized and trusted certification marks in the wastewater industry.

Certification Process

Initial Certification

  1. Your company submits an application.
  2. NSF reviews general information, drawings and design specifications of the treatment system.
  3. NSF installs the unit at a test facility, or travels onsite for in-field products, and performs thorough testing.
  4. NSF issues the final test report.
  5. NSF reviews product literature, data plates, service labels and related documentation.
  6. NSF performs an initial audit of the manufacturing facility.
  7. Upon gaining certification, your company may use the NSF mark on your product, packaging and promotional materials.

Continued Certification

  1. NSF performs annual audits of the manufacturing facility and in some cases authorized representatives.
  2. NSF reevaluates and potentially retests products at least once every seven years.
  3. NSF reviews and approves any product modifications.

Contact NSF International

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