ASSE recognizes the importance and benefits of input from a variety of industry stakeholders in order to develop the best standards and performance documents. Listing Evaluation Criteria (LEC) are Other Recognized Documents (ORD’s) that establish the initial rules for unique products in the marketplace. An LEC is an opportunity for new devices to gain a footing in the marketplace when combined with 3rd-party certification.

An LEC is valid for 5 years from publication date. At that point, the ASSE Product Standards Committee (PSC) will observe its market acceptance and decide the appropriate route for it in partnership with the original requester.

All public comments are reviewed after the end of the 20-day public review period by the PSC and are resolved to the best ability of the PSC and the commenter. Comments must include the following:

  • Name, company (if applicable), and commenter’s email address
  • Health and safety issues and any technical issues related to the LEC verbiage and scope
  • Any evidence and information to support the comments. All attachments must be submitted in PDF or Microsoft Office format
  • Alternate text in order to resolve the issue of concern with the public’s health and safety as a priority

Submit public comments to with the name of the LEC in the subject.


LECs Available for 20-day Public Comment

LEC Title Comments Deadline Scope
ASSE LEC 2008 Point of Entry Anion Exchange – Nitrate Reduction 07/16/2020 Point of Entry anion exchange water treatment products are intended to be used in residential and commercial applications to reduce nitrate from drinking water.
ASSE LEC 2010 Proportional Flow Control Devices, with Protection from Cross Contamination via Hydronic Water, for use in Drinking Water Installations 07/22/2020

The purpose of the device is to control the flow of potable water based on the pressure of hydronic water from a hydronic system. The device performs this hydraulically and has integral cross contamination protection between the potable and hydronic water. This device is typically installed in conjunction with a heat exchanger and a part of a hydronic system loop.


LECs Released and Available

If you have a product that does not quite fit the mold of an existing standard or would like to know more about the process of developing an LEC and whether it is appropriate for you, please contact us at