The first PWMA standard, PWMA PW101-1998, Standard for Testing and Rating Performance of Pressure Washers: Determination of Pressure and Water Flow, was completed and approved in October 1998. PWMA PW101 is intended to provide a uniform method of testing and rating the primary performance characteristics of pressure washers: pressure and water flow. PWMA PW101 applies to pressure washers intended for the household, farm, consumer, or commercial/industrial markets. The pressure washers covered by PWMA PW101 are portable, engine or electric motor driven, in which the discharge line is hand supported and manipulated.

December 7, 2010 at 12:00 PM EST
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Companies actively engaged in the manufacture in the United States of pressure washers are eligible to be members of the PWMA, provided that those companies are also actively engaged, in their own name and with their own organizations, in the sale of pressure washers in the open market within the United States. The current members of the PWMA are the major manufacturers of pressure washers in the United States.

The first PWMA standard, PWMA PW101-1998, Standard for Testing and Rating Performance of Pressure Washers: Determination of Pressure and Water Flow, was completed and approved in October 1998. PWMA PW101 is intended to provide a uniform method of testing and rating the primary performance characteristics of pressure washers: pressure and water flow. PWMA PW101 applies to pressure washers intended for the household, farm, consumer, or commercial/industrial markets. The pressure washers covered by PWMA PW101 are portable, engine or electric motor driven, in which the discharge line is hand supported and manipulated.