NSF 350-2017a

This Standard contains minimum requirements for onsite residential and commercial water treatmentsystems. Systems may include the following:

—Greywater treatment systems having a rated treatment capacity up to 5,678 L/day (1,500 gal/day).This applies to onsite residential and commercial treatment systems that treat greywater, those thattreat laundry water from residential laundry facilities, and those that treat bathing water. See 8.1 forperformance testing and evaluation.

—Residential wastewater treatment systems having a rated treatment capacity up to 5,678 L/day(1,500 gal/day). This applies to onsite residential treatment systems that treat combined wastewatergenerated by the occupants of residence(s). A reuse system treating 1,514 L/day (400 gal/day) to 5,678L/day (1,500 gal/day) shall either be demonstrated to have met the Class I requirements of NSF/ANSI40, or must meet these requirements during concurrent testing to this Standard. A treatment systemtreating less than 1,514 L/day (400 gal/day) is not required to have met the Class I requirements ofNSF/ANSI 40. See 8.2 for performance testing and evaluation.

—Commercial treatment systems ? this applies to onsite commercial treatment systems that treatcombined commercial facility wastewater and commercial facility laundry water of any capacity, andthose treatment systems that treat greywater from commercial facilities with capacities exceeding 5,678L/day (1,500 gal/day). These systems shall be performance tested and evaluated at the location of thereuse system installation, using the wastewater generated onsite from the facility serving the treatmentsystem. See 8.3 for performance testing and evaluation. The key elements of a field evaluation of acommercial treatment system are described in Annex A.

Management methods and end uses appropriate for the treated effluent discharged from onsite residentialand commercial treatment systems meeting Class R (single family residential) or Class C (multi-family andcommercial facilities) requirements of this Standard include indoor restricted urban water use, such as toiletand urinal flushing, and outdoor unrestricted urban water use, such as surface irrigation. Effluent qualitycriteria consistent with these uses are described in 8.6, Criteria.

This Standard is intended to address public health and environmental issues. Actual performance for anysite or system may vary, depending on variations in raw water supply (such as alkalinity and hardness),wastewater constituents, and patterns of use. The end use of the effluent is the responsibility of the owner,design professionals, and regulatory officials.

System components covered under other NSF or NSF/ANSI standards or criteria shall also comply with therequirements therein. This Standard shall in no way restrict new system designs, provided such designsmeet the minimum specifications described herein.

Published:

05/31/2017

ANSI:

ANSI Approved

Number of Pages:

62

File Size:

1 file , 1.1 MB

Redline File Size:

2files, 5.9 MB

Note:

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