Accreditation self-declared (DAkkS)
North Rhine-Westphalia state environment agency in Recklinghausen that runs proficiency tests for notified and accredited laboratories: chemical and microbiological tests in drinking water and other aqueous media, and chemical tests in waste and soil.
Trinkwasser-Ringversuche (drinking water, chemical parameters)
Mikrobiologische Ringversuche (Legionella and colony count in cooling water)
Länderübergreifende Wasser-Ringversuche (LÜRV)
Abfall- und Boden-Ringversuche (waste and soil)
| Scheme | Testing fields | Sample type | Analytes | Rounds/yr | Link |
|---|---|---|---|---|---|
| Trinkwasser-Ringversuche (drinking water, chemical parameters) |
| Drinking water | e.g. pesticides and metabolites, bisphenol A, metals and major ions | — | Scheme page for Trinkwasser-Ringversuche (drinking water, chemical parameters) (opens in a new tab) |
| Mikrobiologische Ringversuche (Legionella and colony count in cooling water) |
| Cooling water | Legionella spp., colony count | — | Scheme page for Mikrobiologische Ringversuche (Legionella and colony count in cooling water) (opens in a new tab) |
| Länderübergreifende Wasser-Ringversuche (LÜRV) |
| Wastewater and other aqueous media | e.g. metals, sulfide | — | Scheme page for Länderübergreifende Wasser-Ringversuche (LÜRV) (opens in a new tab) |
| Abfall- und Boden-Ringversuche (waste and soil) |
| Waste, soil | — | — | Scheme page for Abfall- und Boden-Ringversuche (waste and soil) (opens in a new tab) |
No reviews yet. If your lab has taken part in LANUK NRW (Landesamt für Natur, Umwelt und Klima Nordrhein-Westfalen) - Ringversuche's schemes, you can rate it.
Ratings come from reviewers who confirmed their email address, and every review is checked by EqasOnline before it appears. An average is shown once a provider has 3 reviews.
Run this scheme? Ask your participating labs to rate you:
Self-declared: stated by the provider and not yet verified by EqasOnline.
Compiled from LANUK NRW (Landesamt für Natur, Umwelt und Klima Nordrhein-Westfalen) - Ringversuche's own published information or sent in by the provider, and reviewed by EqasOnline. Check scheme details, fees and dates with the provider before you enrol. 4 schemes listed here.
Last updated 1 Nov 2026.
Is this your organisation, or is something out of date? Update this listing.
Other providers listing schemes in the same testing fields, those in Germany first.
Kempten, Germany
Schemes: Food and feed – chemical-physical testing (Dairy, animal products, beverages, fruit and vegetables, cereals, fats and oils, cocoa, infant formula, animal feed)Food and feed – immunological, molecular biological and microbiological testingFood and feed – organoleptic (sensory) testing
6 schemes
Accreditation self-declared (DAkkS)Stuttgart, Germany
Schemes: Ringversuche Trinkwasser – A 1 Anionen (Drinking water)Ringversuche Trinkwasser – O 2 LHKW/Benzol (Drinking water)Ringversuche Trinkwasser (A 1–A 5 anorganische, O 1–O 5 organische Parameter) (Drinking water)
5 schemes
Accreditation self-declared (DAkkS)Hamburg, Germany
Schemes: Trinkwasser-Ringversuche chemische Analytik (with AQS Baden-Württemberg) (Drinking water)26/1 TW/LÜRV S12 Organochlor-Insektizide in gering belastetem Wasser (Surface, ground and drinking water)
2 schemes
Aurich, GermanyInternational participants
Schemes: Mikrobiologischer Ringversuch: E. coli / coliforme Bakterien, Enterokokken, Koloniezahlen (Drinking water)Mikrobiologischer Ringversuch: Legionella, Pseudomonas aeruginosa, Clostridium perfringens (Drinking water)Ringversuch hygienisch-chemische Parameter in Trinkwasser (3 Teilringversuche) (Drinking water)
3 schemes
Accreditation self-declared (DAkkS)Berlin, GermanyInternational participants
Schemes: BAM-Ringversuch Altlasten (contaminated sites) (Contaminated soils or sediments)BAM-Ringversuch zur Altholzanalytik (waste wood) (Wood)CEQAT-DGHS interlaboratory comparisons (physical hazards of dangerous goods and hazardous substances)
3 schemes
Heidelberg, GermanyInternational participants
Schemes: Clinical ChemistryBlood Gas and ElectrolytesCardiac Marker POCT
24 schemes
Accreditation self-declared (DAkkS)