2015
:Memorandum of understanding on technical exchange between Osaka City and St.Petersburg City signed.

2014
:Field Survey Conducted in Dong Nai Province, Vietnam.
Participation in a technological seminar on Japanese jacking method held in Ho Chi Minh City and an onsite survey of Binh Duong Province in Vietnam undertaken.
Memorandum of Understanding on technical cooperation between Osaka City and Yangon City signed.
Visit to the State Unitary Enterprise for waterworks and sewage works and participation in a seminar in St.Petersburg, Russia.

2013
:OWESA conducted a field survey in Yangon, Myanmar, including participation in the seminar on water supply, sewerage and drainage sector programme.
Training conducted for those in charge of management of sewerage system in Yangon City, Myanmar.

2012
:The 6th World Water Forum.
Discussing PPP with Royal Thai Government.
The Second Water Business Delegation in Vietnam.
The Business Matching event at Green Innovation EXPO2012.

2011
:Osaka Water & Environment Solutions Association (OWESA) launched.
The Water Expo of Singapore International Water Week.
Tokyo Green Industry Exhibition 2011 of INCHEM TOKYO 2011.