Who we are

Wastewater Solutions Group GmbH

Wastewater Solutions Group GmbH (WWSG) is a global company based in Bachmanning, Upper Austria.

As part of GIS Aqua Austria GmbH, the company has developed into a leading partner and operator of innovative, mobile and stationary solutions for wastewater treatment since it was founded in 2009.

Wir planen, konstruieren und betreiben  Wassermanagementsysteme, die unseren Kunden wirtschaftliche und ökologische Vorteile bieten.


As WWSG, we want to make a significant contribution to cleaning all types of wastewater with our efficient solutions and our professional management in order to reuse it and not pollute the environment.


We offer our customers a unique service experience and, after detailed evaluation, develop tailor-made concepts for economic and ecological advantages for municipalities, organizations and companies.

Our Values


We build long-term relationships with our customers, partners, suppliers and employees. Working with industry experts who are committed to excellent service.


We strive to provide the latest sustainable wastewater treatment technologies worldwide. We see our responsibility not only in offering high-quality technology, but also in creating awareness for the sustainable use of water.


We attach great importance to open dealings with our business partners, stakeholders and employees. Only through sincere and honest communication can problems be solved and conflicts avoided.

History of the Wastewater Solutions Group GmbH

  • 2009 Founding of the WWSG
  • 2010 Construction of the first small and compact wastewater treatment plants in an industrial environment
  • 2011 Mgmt Buy-Out by Ing. Reinhard Pregartbauer | GINZLER Group takes a stake in WWSG | Relocation of the company headquarters to Bachmanning, 4672 Austria
  • 2012 Construction of the first container sewage treatment plant with MBR system in 20 ft. container (capacity 146 m3/day, 960 PE)
  • 2013/14 International projects, expansion
  • 2015 WWSG operational management of stationary container sewage treatment plants in the municipal area in Austria (24/7)
  • 2018 Strong expansion in the military sector and WWSG operational management of stationary container treatment and water treatment plants, internationally
  • 2019 Founding of REIKEN Solutions, WWSG Nigeria, based in Lagos
  • 2020 ISO 9001 certification
  • 2021 Development of a mobile wastewater monitoring for COVID analysis in cooperation with the UNI Innsbruck, Austria
  • 2022 Management change due to the tragic death of GF Ing. Reinhard Pregartbauer
  • 2022 Further expansion in the business areas: mobile solutions, industrial wastewater technology and operational management

Export activity in Nigeria started with design, construction and installation of containerized wastewater treatment plant for Mobil Producing Nigeria Limited in 2012.

Further successful projects and a very intensive cooperation with leading Nigerian experts who trust in know-how from Austria followed.

The increasing demand for professional operational management and having our expert Kevin Aziba on site were the best prerequisites for founding our local subsidiary called "Reiken Solutions".

Together we provide best-in-class solutions for wastewater and water treatment, operations and maintenance for a wide range of industries and organizations.

With our roots in Nigeria, we are expanding into the rest of West Africa and across Africa.

Management of the Wastewater Solutions Group GmbH

Ing. Hubert Ginzler

Managing Director

T: +43-7472-627-79-72
M: hubert.ginzler@gisaqua.com

Dr. Peter Kerschberger

Chief Operating Officer

T: +43-720-850 100-1
M: peter.kerschberger@wastewater.at

Kevin Aziba

Regional Manager West Afrika (Reiken Solutions Ltd.)

T: +234-802-0544472
M: kevin.aziba@wastewater.at

The Team

Andreas Buchinger

Technical Project Leader

T: +43-720-850 100-3
Mobil: +43-664-355 22 38 
M: technik@wastewater.at

Peter Stelzhammer

Chemical laboratory technician, project management

T:  +43-720-850 100-5
Mobil:  +43-664-358 50 19
M:  peter.stelzhammer@wastewater.at

Ingrid Kaser


T: +43-720-850 100-2
M: ingrid.kaser@wastewater.at

en_USEnglish (United States)