Evaluation Criteria and Guidelines

Table of Contents

 

Introduction

Pursuant to the 2nd amendment of the German Drinking Water Ordinance (TrinkwV), since December 2012 the German Environment Agency (Umweltbundesamt – UBA ) has been tasked with stipulating mandatory evaluation criteria for materials and substances that come into contact with drinking water. Previously, UBA has issued guidelines and recommendations which were less legally binding. Since the amendment of TrinkwV mentioned, these guidelines and recommendations have successively been implemented in the mandatory evaluation criteria.

UBA´s mandate to elaborate and to pursue evaluation criteria documents still is effective from the revised German Drinking Water Ordinance dated 20 June 2023. According to section 15 (2) of the TrinkwV, evaluation criteria documents become legally binding two years after they have been issued by UBA. After this date, for construction and maintenance of facilities for the abstraction, treatment and distribution of drinking water only materials that fulfill the requirements of these evaluation criteria must be used.

Accessible documents below will be updated in terms of applicable citations referring to the revised TrinkwV on the instant of pending amendments of the respective document.For certification (attestation of conformity) of products in contact with drinking water according to the evaluation criteria the German Environment Agency has set up a recommendation. An explanatory document adressing questions and answers (FAQ) in relation to the implementation of these regulatory documents can be found righthand within the Documents navigation box, which will be amended if required.

 

Evaluation criteria for metallic materials

For metallic materials in contact with drinking water the following evaluation criteria document applies:

The amendments can be reviewed in the German Federal Gazette (only in German):

    The evaluation criteria document comprises a positive list of metallic materials hygienically suitable for contact with drinking water. The German Environment Agency evaluates metallic materials in collaboration with relevant authorities of other EU member states that cooperate within the voluntary 4MSI collaboration (4MS-Initiative, started by four EU member states Germany, France, Netherlands and Great Britain). Metallic materials having been assessed this way are included in the 4MSI Composition List as well.

    The below mentioned rules of procedure govern the positive list of metallic materials used for products in contact with drinking water contained in the evaluation criteria document.

    Currently, product testing (according to e.g. DIN EN 16058) might be necessary to verify hygienic suitability for drinking water of factory soldered products and of products comprising platings not assignable to the scope of the evaluation criteria document for metallic materials. For such testing and the corresponding assessment, the following, currently non-binding, information has been prepared:

     

    Evaluation criteria for enamels and ceramic materials

    For enamels and ceramic materials in contact with drinking water the following evaluation criteria document applies:

    The amendments can be reviewed in the German Federal Gazette (only in German):

    To comprehend the rationale for reference concentrations as defined in the evaluation criteria document for enamels and ceramic materials, UBA has published an information:

    To help with the process of consideration of new materials in the evaluation criteria document for enamels and ceramic materials, UBA has published an information.

     

    Evaluation criteria for cementitious materials

    The German Environment Agency does not intend to define an evaluation criteria document for cementitious materials in contact with drinking water in anticipation of an European regulation. According to the revised European Drinking Water Directive (Directive (EU) 2020/2184), harmonized European requirements for materials in contact with drinking water will be defined. Until then, cementitious materials can be tested and evaluated according to DVGW-standard W 347. The German Environment Agency voluntarily offers as additional service to evaluate more starting substances not covered by DVGW-standard W 347. Evaluated starting substances are published in the information document below.

     

    Evaluation criteria for plastics and other organic materials in contact with drinking water

    For plastics and other organic materials (coatings, lubricants, elastomers and thermoplastic elastomers) in contact with drinking water the following evaluation criteria document applies:

    The amendments can be reviewed in the German Federal Gazette (only in German):

    For the transition from UBA guidelines to KTW evaluation criteria the German Environment Agency has set up the following transitional regulation:

    One prerequisite for being tested according to the evaluation criteria document is that starting substances to be employed are evaluated and listed in the respective polymer-specific positive list. The German Environment Agency evaluates drinking water hygienic suitability of starting substances for organic materials in cooperation with the German Federal Institute for Risk Assessment (Bundesinstitut für Risikobewertung, BfR).  From enacting the revised European Drinking Water Directive and its subsequent national implementation as revised German Drinking Water Ordinance (TrinkwV), ECHA and the Member States participating in the 4MSI collaboration will be informed about the recent assessment of a starting substance.

    For the management of positive lists of starting substances for organic materials of the evaluation criteria documents, the rules of procedure mentioned below apply.

    The KTW Guideline, Coating Guideline and Lubricants Guideline have been withdrawn on 21 March 2021.

     

    Transitional regulation for silicones

    Silicones hitherto have been regulated within the KTW Guideline and are not yet covered by the Evaluation criteria document for plastics and other organic materials in contact with drinking water. For this reason, the following transitional recommendation applies:

     

    Elastomer Guideline

    The valid version of the Elastomer Guideline dates from 16 March 2016 and will be withdrawn on 1 March 2025.

    The valid positive list of the starting substances is included in Annex D of the KTW evaluation criteria document.

    For some materials the formula-specific requirements concerning migration into drinking water can be computed mathematically by using the Modelling Guideline, rather than being substantiated analytically.

    The De Minimis Guideline can additionally be used as a basis for formulation assessment for substances that are used in small amounts and that have specific technological functions.

    UBA has transposed the Elastomer Guideline and the TPE transitional regulation into the KTW evaluation criteria document.

     

    Thermoplastic elastomers

    Hitherto thermoplastic elastomers could be assessed using the transitional recommendation for hygienic assessment of thermoplastic elastomers (TPE Transitional Recommendation).

    The document version currently valid dates from 11 March 2019 and will be withdrawn on 1 March 2025.

    By having transposed the Elastomer Guideline and the TPE transitional regulation into the KTW evaluation criteria document, UBA has also rearranged hygienic assessment of thermoplastic elastomers.

     

    De Minimis Guideline

    The recommendation titled: “Assessment of substances with a specific technological function and low required quantities relating to the formulation review in accordance with the guidelines of the German Environment Agency on the hygienic assessment of organic materials in contact with drinking water (De Minimis Guideline)” was published in the 2012 issue of Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz (55:150-151).

    The valid version of the De Minimis guideline dates from 18 April 2011.

    This guideline can be used in conjunction with the still existing documents Elastomer Guideline and transitional recommendation for TPE to evaluate formulations for manufacturing organic materials in contact with drinking water.

     

    Modelling Guideline

    The Guideline for the Mathematical Estimate of the Migration of Individual Substances from Organic Material in Drinking Water (Modelling Guideline) was published in the August 2009 issue of Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz (52:1105-1112).

    The valid version is the one dated 7 October 2008.

    The Modelling Guideline enables the testing of formulation and substance-specific requirements pursuant to the Evaluation criteria for plastics and other organic materials in contact with drinking water, the KTW Guideline, Coating Guideline, Lubricant Guideline and Elastomer Guideline, as well as to the transitional recommendation for thermoplastic elastomers, using mathematical modelling. Following this, experimental testing concerning these requirements is not necessary.

     

    Recommendation for attestation of conformity of product hygiene suitability for drinking water

    The German Environment Agency has published the „Recommendation for attestation of conformity of product hygiene suitability for drinking water“:

    The German Environmental Agency is mandated to publish evaluation criteria documents for drinking water contact materials pursuant to section 15 (1) of the TrinkwV. These legally binding evaluation criteria do not include determinations regarding to the manner of attestation of conformity for products intended to come into contact with drinking water. As endorsement to evaluation criteria documents, the German Environment Agency, in cooperation with expert groups and after having passed a hearing process, have prepared a recommendation for attestation of conformity of product hygiene suitability for drinking water.

    The recommendation for attestation of conformity of product hygiene suitability for drinking water had been amended before in April and July 2020 (1st and 2nd amendment, respectively) and has been updated in July 2021 by the current 3rd amendment.

    Explanations for implementation of this recommendation in certification processes for products in contact with drinking water following evaluation criteria are provided in an FAQ document, see navigation box 'Documents'.

     

    Rules of procedure of the German Environment Agency for the management of the positive list of metallic materials hygienically suitable for drinking water

    For the management of the positive list of metallic materials hygienically suitable for the contact with drinking water as implemented in the evaluation criteria document for metallic materials in contact with drinking water, the following rules of procedure apply:

     

    Rules of procedure for the management of the positive list of starting substances for organic materials in contact with drinking water

    For the management of positive lists of starting substances for Evaluation criteria for plastics and other organic materials in contact with drinking water, the following rules of procedure apply:

    The appendixes can be downloaded separately:

    • Annex 1: Application for inclusion of a starting substance in the positive list of starting substances for organic materials in contact with drinking water
    • Annex 2: Supplementary application form for the inclusion of a not completely assessed substance
    • Annex 3: Supplementary application form for the inclusion of a substance which is already assessed by EFSA
    • Annex 4: Supplementary application form for the inclusion of a substance which is already assessed by another authority or international organization
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