Water Supply in the
Canton of St. Gallen

AQUALITY AG

Since 2016 · 11–20 empl.

The core activity of AQUALITY AG is to provide services and products for water supply, particularly in the areas of: * Management of water supply systems (AQUAsupport) * Cleaning and disinfection of reservoir chambers and pipes as well as room disinfection (AQUAclean) * Inspection, well rehabilitation and renovation (AQUAplus) * Flow and pressure measurements (AQUApress) The company thus offers comprehensive solutions for the maintenance, servicing and optimization of water supply systems.

Seitz Messtechnik AG

Since 2017 · 1–10 empl.

The core activity of Seitz Messtechnik AG is the planning, installation, maintenance and consulting of measurement and control systems for water and wastewater treatment plants, including surface water, drinking water, flood protection, industry and wastewater treatment plants.

Green Ocean Solutions AG

Since 2018 · 21–50 empl.

Green Ocean Solutions AG is a company providing industrial wastewater treatment technologies, notably wet oxidation (ORCAN®) and flotation (FRES:H®) for toxic and non‑biodegradable wastewater streams. The company offers engineering, plant construction and operation as well as process optimisation to improve resource efficiency.

EVS AG

Since 1992 · 11–20 empl.·5.0(1)

The core activity of EVS AG is the construction, operation and maintenance of water and gas pipelines, including industrial pipeline construction and house connections. The company also offers services in the field of gas energy, such as gas sales, installation of heating systems and replacement of heating systems.

TRIWATEC GmbH

Since 2026 · 1–10 empl.

TRIWATEC GmbH provides services in pipeline construction and water infrastructure. The company installs plastic and cast-iron pipes, fits valves and hydrants, and builds house connections as well as inspection, well and water reservoir chambers.

Genossenschaft Wasserversorgung Rapperswil-Jona

11–20 empl.

The company's core activity is water supply, particularly providing high-quality drinking, utility and firefighting water to the inhabitants of Rapperswil-Jona.

Genossenschaft Trinkwasserversorgung Buchsteig

Since 1901 · 1–10 empl.

Wasserversorgungsgenossenschaft Steinach

Since 1902 · 1–10 empl.

Dorfkorporation Alterschwil Genossenschaft

Since 1935 · 1–10 empl.

Wasserversorgung Oetwil Genossenschaft

Since 1953 · 1–10 empl.

Rainmaker

Since 2000 · 1–10 empl.

IWT International Water Technologies AG

Since 2004 · 1–10 empl.