NSF ANSI 240-2011 PDF

Full title and description

NSF/ANSI 240-2011 — Drainfield Trench Product Sizing for Gravity Dispersal Onsite Wastewater Treatment and Dispersal Systems. This American National Standard establishes minimum material, design, construction and hydraulic performance requirements for drainfield trench products used in place of conventional coarse aggregate within onsite wastewater dispersal systems, and specifies minimum manufacturer literature to be supplied to authorized representatives.

Abstract

NSF/ANSI 240-2011 provides standardized methods and baseline requirements to evaluate and compare gravity-dispersal drainfield trench products (alternative media and structural products) based on hydraulic performance and suitability for use in onsite wastewater dispersal systems. The standard is intended to help manufacturers, regulators and design professionals assess product sizing and performance while ensuring minimum documentation and labeling.

General information

• Status: Historical (revised by NSF/ANSI 240-2017).
• Publication date: 2011 (edition: 2011).
• Publisher: NSF International (published as an ANSI-approved / NSF consensus standard).
• ICS / categories: Sewage water / onsite wastewater (ICS 13.060.30 and related wastewater/sewage categories).
• Edition / version: NSF/ANSI 240-2011 (original 2011 edition).
• Number of pages: Not specified in the public ANSI/NSF summary listing; full PDF edition available for purchase from standards distributors.

Scope

The standard applies to gravity-dispersal drainfield trench products used as alternatives to traditional stone or gravel trenches in onsite wastewater treatment and dispersal systems. It sets minimum requirements for materials, design and construction, establishes hydraulic sizing and performance criteria for comparing products, and requires minimum manufacturer literature to accompany products for review by authorized representatives and regulators.

Key topics and requirements

• Definition and classification of drainfield trench product types intended for gravity dispersal.
• Minimum material, design and construction requirements to ensure structural and hydraulic suitability in dispersal trenches.
• Hydraulic performance criteria and sizing methods used to compare alternative media to conventional aggregate trenches.
• Minimum manufacturer literature and documentation requirements (product data, installation guidance, performance claims).
• Test/assessment focus on hydraulic behavior and field applicability for onsite wastewater dispersal contexts.

Typical use and users

Used by product manufacturers (to demonstrate compliance and document performance), consulting and civil engineers, onsite wastewater system designers, permitting authorities and regulators, testing laboratories, and installers seeking to specify or approve alternative trench media or engineered dispersal products for gravity-fed onsite wastewater systems.

Related standards

NSF/ANSI 240-2011 was revised by NSF/ANSI 240-2017; other related NSF/ANSI standards and protocols for onsite wastewater and water reuse include standards such as NSF/ANSI 40, NSF/ANSI 360 and NSF protocols addressing field performance and wastewater treatment system evaluation. Users should consult the current NSF portfolio for the most recent related standards and test protocols.

Keywords

drainfield, trench sizing, gravity dispersal, onsite wastewater, dispersal system, hydraulic performance, alternative media, NSF, ANSI, manufacturer literature, drainfield product.

FAQ

Q: What is this standard?

A: NSF/ANSI 240-2011 is an American National Standard that defines minimum material, design, construction and hydraulic performance requirements for drainfield trench products used for gravity dispersal in onsite wastewater treatment and dispersal systems.

Q: What does it cover?

A: It covers product classification, material and construction requirements, hydraulic sizing and performance criteria for comparing alternative trench media and engineered dispersal products, and minimum manufacturer literature required for product review and use.

Q: Who typically uses it?

A: Product manufacturers, design engineers, permitting authorities and regulators, testing labs, and installers working with onsite wastewater dispersal systems and alternative drainfield products.

Q: Is it current or superseded?

A: NSF/ANSI 240-2011 is historical and was revised by NSF/ANSI 240-2017; users should reference the 2017 edition (or later) for the current requirements.

Q: Is it part of a series?

A: It sits within NSF’s portfolio of water and wastewater standards and is related to other NSF/ANSI and NSF protocols that govern onsite wastewater treatment, field performance verification, and water reuse standards (for example NSF/ANSI 40, 350 and 360 among others).

Q: What are the key keywords?

A: Drainfield, trench sizing, gravity dispersal, onsite wastewater, dispersal product, hydraulic performance, engineered media, NSF/ANSI.