Producers and importers of drinking water products. And indirect, drinking water companies, installers and owners of drinking water installations.

The requirements set for the Dutch drinking water are laid down in the Drinking Water Decree (Drinkwaterbesluit).The "Regeling materialen en chemicaliën drink- en warm tapwatervoorziening" specifies requirements for the toxicological, organoleptic and microbiological approval of materials and chemicals. The "ATA by Kiwa"-declaration, recognized by the Dutch Ministry of Infrastructure and the Environment, shows that a product complies with these requirements.

The "Drinkwaterbesluit" and "Regeling materialen en chemicaliën drink- en warm tapwatervoorziening" are published under the authority of the Dutch Ministry of Infrastructure and the Environment. The documents can be found on the government website, using the following links:

Important parts of the Regulation are the Positive Lists for polymers and for colorants and pigment and the Composite List for metals. They list compounds that have been approved for use in products that (may) come into contact with the Dutch drinking water. Annex B of the Regulation contains the active lists.

Transition policy and ATA-Timeline

The Regulation was extended in 2011, including a 2 year transition period. During that period it became clear that for some products more time was needed and, after consulting Kiwa, the Ministry of Infrastructure and the Environment issued a letter announcing a clusterwise approach of the related product groups; you can find that letter on the site of our ATA Timeline. The transition policy goes into both the terms for re-certification and connection to the admission policy of the so-called 4MS, especially Germany (see below: European developments).

On 7 November 2013 Kiwa organised a symposium about the Regulation Drinking Water and Warm Tapwater Supply. Program, presentations and report you can find here (mostly in Dutch).

European developments

Member states are required by the European Drinking Water Directive to have a system to prevent materials and chemicals from influencing the drinking water quality. The Dutch Regulation, combined with the "ATA by Kiwa"-declaration is a good example of such a system.
Based on a shared initiative a collaboration group between France, Germany, the UK and the Netherlands works on mutual recognition of the national approval systems with the goal of one harmonised system for materials in contact with drinking water. The collaboration group gives more information on this website.
The Dutch system is very similar to the developing harmonised system. This means that introduction of the harmonised system will not (or hardly) lead to additional evaluation for products with a "ATA by Kiwa"-declaration. These products will then be readily accepted in the participating EU states.
A number of EU member states are implementing approval systems based on the Dutch approach. When these systems enter into effect, the "ATA by Kiwa"-declaration will be officially recognised and products with the Kiwa -watermark will then be approved immediately.


The "ATA by Kiwa"-declaration focusses only on the hygienic requirements as set in the Regulation. For many drinking water products technical guidelines (so-called evaluation guidelines) are in use to evaluate the technical aspects of these products. The "ATA by Kiwa"- declaration is an integral part of these evaluation guidelines. For these products one certificate is issued, combining the technical and hygienic aspects. Certificates based on these evaluation guidelines thus indicate compliance with all requirements and the products are to be marked with the Kiwa mark. If a certificate is based on an evaluation guideline that already includes fully the new legal requirements the products are to be marked with the especially new developed Kiwa Water Mark. See here for the use of Kiwa marks.

The procedure for obtaining the "ATA bij Kiwa"-declaration part of a certificate depends mainly on the composition of the product. An ATA-certification engineer review this composition and compares it to the positive lists. If one or more of the raw materials is not listed, specific requirements are set by the Minister of Infrastructure and the Environment. The Minister is advised by the Ministerial Committee of Experts, according to article 20 of the Drinking Water Decree.

Searching for certificates

  • if you search for all certificates with ATA with the Kiwa Water Mark click here and fill in the screen in the search box "Scope": "Water mark" and click on "enter" or the "Zoeken" button.
  • if you search for all certificates with ATA with no application for an upgrade to the Water Mark running click here and fill in the screen in the search box "Scope": "No application" and click on "enter" or the "Zoeken" button. These certificates will lose their validity in the (near) future.
  • for all certificates without an entry in the "Scope" column an application for upgrade to Kiwa Water Mark is running.

More information