Bild: Die damalige Umweltministerin Bärbel Höhn des Landes NRW hält die Einweihungsrede

Company Profile

PIA GmbH is your accredited and notified testing body for the certification of wastewater treatment products. Our range of services covers a broad spectrum of small and medium-sized wastewater treatment plants.

Do you need proof of how well your plants perform? Not only do we conduct initial type tests of, for example, ship sewage or greywater systems, but we also test small wastewater treatment plants as part of the CE marking according to the European standard series DIN EN 12566. Only when your products are compliant with relevant standards can you successfully enter the market.

Our strong team of engineers, scientists, craftsmen and administrative staff ensure competence and quality. Since we are not only motivated, but also have the necessary expertise, we can provide you with individualised support and market-adapted examinations. Trust the expertise of PIA GmbH, assess your potential correctly and make the best decisions.


In 2002, the Testing Institute for Wastewater Technology GmbH (PIA GmbH) was founded as a test facility of the Testing and Development Institute for Wastewater Technology at RWTH Aachen University e.V. (PIA e.V.). Even before the small wastewater treatment standard EN 12566-3 officially came into force, PIA had already started testing plants according to this standard for the German market. Over the years, it has continuously improved the quality of its testing and expertise of its staff.

You can profit from this permanent evolution. Now, PIA GmbH has an ever-growing global network at its disposal. This has given us a leading edge in terms of understanding and verifying according to national and international requirements in the wastewater sector. In addition, PIA GmbH is actively represented in numerous technical boards and standardisation committees. Moreover, we put another testing hall into operation in 2016. The new and enhanced infrastructure now allows us, among others, to run tests in the fields of water re-use , separator technology and stormwater treatment.

You can find more informations about PIA e.V. on


PIA GmbH has become the largest testing laboratory of its kind and has a favourable location in the heart of Europe. Situated at “Bildchen” – the former wastewater treatment plant of the city of Aachen – PIA has the optimal conditions to examine your small wastewater treatment system, ship sewage treatment plant or other wastewater treatment systems.