| June 15, 1981 | Established Kennan Eisei Kogyo Co., Ltd. |
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| November 1976 | Developed Hazaka Plant and started Kennan Eisei Kogyo as a private business |
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| January 1978 | Acquired license for Industrial Waste Disposal Operator |
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| June 1981 | Incorporated as Kennan Eisei Kogyo Co., Ltd. |
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| November 1984 | Developed Hazaka Plant and completed 4 lanes |
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| October 1991 | Sato Hog Farming Facility introduced a Hazaka Plant in Ogawara-machi, Shibata-gun, Miyagi Prefecture to process excreta |
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| November 1994 | Increased capital to 26 million yen |
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| February 1995 | Akita Agricultural Public Corporation introduced a Hazaka Plant in Akita-shi, Akita Prefecture |
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| May 1995 | Acquired license for general construction business (Cleaning facility construction business) |
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| June 1995 | Received the Chairman’s Award as a company recognized for rendering distinguished service from the National Federation of Industrial Waste Management Associations |
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| September 1995 | Completed garage and research buildings (Hazaka Plant Research Center) |
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| December 1995 | Hokkaido Agricultural Public Corporation introduced a Hazaka Plant in Hamatonbetsu-cho Hokkaido |
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| October 1996 | Received Chairman’s Award from the Recycling Promotion Conference as a company recognized for rendering distinguished service to the promotion of recycling |
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| May 1997 | Saitama Prefectural Livestock Experiment Station introduced a Hazaka Plant |
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| February 1998 | Acquired license for specified construction business (Cleaning facility construction business) |
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| July 1998 | Acquired patent “Method for treating organic waste matter” |
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| October 1998 | Received award from the Director General of the Tohoku Regional Bureau, Ministry of Land, Infrastructure and Transportation for improving the performance in the promotion of recycling construction waste |
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| September 1999 | Received the Tohoku New Business Grand Prize Award from the Tohoku New Business Conference |
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| August 2000 | Introduced a Hazaka Plant in Tosa-cho, Kochi Prefecture |
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| January 2001 | Registered sludge fermentation fertilizer “Hazaka Compost” |
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| February 2001 | Fukui Agricultural Public Corporation introduced a Hazaka Plant in Ono-shi, Fukui Prefecture |
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| August 2001 | Miyagi Prefecture Sewerage Corporation introduced a Hazaka Plant in the Abukuma Sewerage Treatment Plant |
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| September 2001 | Introduced a Hazaka Plant in Reihoku-machi, Kumamoto Prefecture |
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| December 2001 | Introduced a Hazaka Plant in Kinpo-cho, Kagoshima Prefecture |
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| June 2002 | eceived the Excellent Local Business Establishment Award from the National Federation of Industrial Waste Management Associations |
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| November 2002 | Introduced a Hazaka Plant in Oya-cho, Hyogo Prefecture |
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| March 2004 | Fukawa Yokei Agricultural Cooperative Association introduced a Hazaka Plant in Nagato-shi, Yamaguchi Prefecture |
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| January 2005 | Introduced a Hazaka Plant in Toyoura-cho, Hokkaido |
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| January 2005 | Heiwabussan Co., Ltd. introduced a Hazaka Plant in Sukagawa-shi, Fukushima Prefecture |
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| August 2005 | Fuji Foods Corporation introduced a Hazaka Plant in Nikko-shi, Tochigi Prefecture |
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| December 2005 | Ishiigumi Co., Ltd. introduced a Hazaka Plant in Tochio-shi, Niigata Prefecture |
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