Sake is made up with 80% water and the use of water in sake brewing is crucial for the quality of the final sake. 

Water is used in almost ever production step, from washing rice to dilution of the final product before bottling. The total amount of water used to brew sake is about 30 times more than the amount of rice used.

Water is an appropriate analogy of the apparently simple yet inherently complex nature of sake brewing. 

Gō 合 Sake wants to help preserving water biotopes and supports since June 2020 the NABU-Initiative: "Lake Stechlin".

"Founded in 1899, NABU (Nature And Biodiversity Conservation Union), is one of the oldest and largest environment associations in Germany. The association encompasses more than 700,000 members and sponsors, who commit themselves to the conservation of threatened habitats, flora and fauna, to climate protection and energy policy.

NABU's main objectives are the preservation of habitats and biodiversity, the promotion of sustainability in agriculture, forest management and water supply and distribution, as well as to enhance the significance of nature conservation in our society."

Lake Stechlin is located in Brandenburg, and is well known for the good quality of its water. With a depth of 70 metres, it is Brandenburg’s deepest lake. The Stechlin district is still one of the most important oligotrophic landscapes of Central Europe and a LIFE project was undertaken for the restoration of clear water lakes, mires and swamp forests of the Lake Stechlin. On 22 March 2012 The Global Nature Fund announced Lake Stechlin as the "Living Lake of the Year 2012".

The depths of Lake Stechlin are home to the Fontane cisco, a distinct species of fish found only in these lakes. Over 160 lakes and the channels joining them, countless little marshes and old deciduous forests, mainly beech groves, characterise the landscape of this Nature Park.  The beech tree is not even found in five per cent of its original locations in Germany any more.