FAQ: Learn more about the UBA assessment basis


Update on the transitional period

On July 10th, 2020 the "RECOMMENDATION - Confirmation of conformity of products suitable for drinking water hygiene" was published on the UBA website. This resulted in fundamental changes:
Due to the difficulties encountered in 2020 as a result of the COVID-19 pandemic in carrying out initial inspections, third-party monitoring, and the associated sampling of test specimens, the confirmation of conformity of products or components, including those of risk group P1, can be carried out for organic materials or product group A and B, respectively until March 21st, 2023 on the basis of a type test. For this purpose, test reports prepared for KTW test certificates can be used. The prerequisite for this is:

  • The test reports must have been issued after March 21st, 2013.
  • Recipe evaluation and evaluation of the test results must be carried out on the basis of the KTW-BWGL or repeated if necessary.



The following information refers to the recommendation of the German Federal Environment Agency (UBA), which was published before the above mentioned update (2020-07-10):


Evaluation criteria vs. KTW-Guideline

Since March 2019, the German Federal Environment Agency (UBA) has had a new assessment basis for organic materials in contact with drinking water. In addition, a recommendation has been published to confirm the conformity of drinking water hygienic suitability of products, which provides for most product groups to be certified by independent accredited certification bodies. Since March 2019, the same product groups have also been subject to the legally binding requirement that manufacturers, together with an accredited certification body, carry out and document a factory production control (WPK) (1+ system).


What effect does the new assessment basis have?

After a transitional period of two years, at the latest 21 March 2021, existing test certificates according to the KTW Guideline, the Coating Guideline and the Lubricants Guideline lose their basis of preparation and thus their practical validity. The still valid regulations (e.g. UBA Elastomer Guideline) will also be revised by 2021 and integrated into the system of evaluation bases.

Certification for most products both for organic materials and for metals in contact with drinking water must be certified by a certificate from an accredited certification body (e.g. OFI) in accordance with the new evaluation principles. This certificate is the basis for your declaration of conformity.


Which materials are affected?

Here you find an overview of the materials in contact with drinking water in domestic installations that are currently affected and will be affected in the future:


Currently not affected


Cement-bound materials

Organic plastics


Organic coatings



Thermoplastic elastomers


How does my product get a certificate?

You can easily apply for certification at OFI.

Which steps are necessary to obtain a certificate, depending on the procedure, can be found here in simplified form:


1+ System

Simplified procedure

Initial inspection



Check of FPC



Initial test



Annual exturnal surveillance




The classification of the procedure you have to follow depends on your product.


What does the declaration of conformity cost?

The costs for obtaining the declaration of conformity can be found in the current fee sheet for product certification UBA (PDF).


For further details please contact our experts at OFI.