Water Systems Council/ASSE International Create ANSI Standard for Pitless Adapters, Pitless Units, and Well Caps

A co-development effort by the Water Systems Council and ASSE International to update the standard for Performance Requirements for Pitless Adapters, Pitless Units, and Well Caps—ASSE 1093-2019 / WSC PAS-97(2019)—has resulted in its designation as an American National Standard by the American National Standards Institute (ANSI).

The Water Systems Council (WSC) first established a standard for pitless adapters and pitless units in 1966, followed by the development of a standard for well caps in 1988. A combined standard—PAS-97—was adopted in 1997. In 2019, WSC’s PAS-97 Working Group co-developed a revision of the PAS-97 standard with the Product Standards Committee of ASSE International in order to meet ANSI accreditation requirements.

Pitless adapters and pitless units are devices designed to attach to openings in the water well casing. When properly installed, they provide sanitary connections by preventing the entrance of contaminants from surface or near-surface sources through such openings into the well or potable water supply, and permit the termination of the well above the ground surface.

Performance requirements in ASSE 1093-2019 / WSC PAS-97(2019) include compliance testing for water contamination and internal pressure of pitless adapters and pitless units, and tamper resistance, water resistance, vermin and contaminant/pollutant resistance, and venting of sanitary well caps, among other detailed requirements.

To learn more about ASSE 1093-2019 / WSC PAS-97(2019), visit the WSC Water Well Standards page. For questions regarding the standard, contact Manager of Product Certification and Standards Christopher White at chris.white@asse-plumbing.org or Water Systems Council Member Services Director Erin Coffman at ecoffman@watersystemscouncil.org.