• 1946

    William (Bill) H. Stout starts Stout Irrigation

  • 1949

    The first Flapper Drain Valve™ created

  • 1950

    Bill Stout starts Wyss Irrigation and develops the Stout-Wyss Irrigation System featured in the July issue of Popular Science

  • 1952

    Stout & Wyss Irrgation is sold to Farmland Irrigation Company Inc.

  • 1954

    Bill Stout starts Irrigation Accessories Co. IACO begins manufacturing risers

  • 1962

    Irrigation Accessories Co. incorporated Ken Roden - President

  • 1966

    Spike Coupler™ invented

  • 1967

    Mobile Irrigation System Patent

  • 1971

    Mobile Irrigation System being installed. Bill Stout passes away, and Ken Roden takes over company.

  • 1978

    IACO begins selling Elbows and Drops

  • 1984

    IACO begins selling Boombacks™

  • 1986

    Ken Roden retires, and long time employee M. Duane Graven purchases company.

  • 1990

    Moved Headquaters to Vancouver, WA

  • 2004

    M. Duane Graven retires, and long time employee Jon R. Johnston purchases company.

  • 2005

    Hose Boom™ created, Innovative Boom Technology™ implemented.

  • 2006

    Riser Fitting Updated

  • 2010

    Hose Boom™ adapted for Part-Cirlce Rotators, Dry Wheel Track Technology implemented.

  • 2012

    50 year Anniversary

  • 2013

    On Cover of Potato Grower Magazine, article on IACO Boombacks.



Irrigation Accessories Co. has been manufacturing Ag Irrigation products for over 55 years.  Bill Stout started inventing in the late forties and continued to do so until he passed in 1971.  Formed in 1954 and incorporated in 1962, IACO supplied great service and the right product.  That tradition continues today.  Whether it’s supplying a dealer with replacement parts for a failed overseas knockoff, developing the Big Gun Pod™ automating handlines or continuing to develop Boombacks™ with products like the Hose Boom™ and Sling Finger™ for an evolving environment.  We strive to make it right.


Our Mission

DESIGNED AND MANUFACTURED IN VANCOUVER, WA, USA. Irrigation Accessories Co. strives to manufacture top-quality, innovative, water-saving Ag irrigation products.  We have a reputation built on over 55 years of serving our customers with integrity: On-time delivery of a quality product we manufacture.  We are proud to stand behind our service and products.  We make it right for our customers.

60 Year AnniversaryIACO 60 Years

In 2022, Irrigation Accessories Co. marked 60 years in business. Founded in 1954 and incorporated in 1962, Irrigation Accessories Co. has flourished by recognizing the merits of longtime employees. Following Bill Stout, every owner: Ken Roden, M. Duane Graven and now Jon R. Johnston, has been a long-term employee who has risen through the ranks by showing commitment to the principles of innovation and integrity first articulated by Bill Stout.