Frequently asked questions
  • Can WLN test mineral water on its drinking water quality?

    To assess mineral water for its suitability as drinking water formally all parameters as stated in the Water Supply Decree must be measured. However, this is  a costly matter. The Water Supply Decree states that among other things research must be done for possible contaminations by e.g. solvents, pesticides, heavy metals etc.

    Own use: limited research suffices
    If the water is for own use, it suffices to do a limited analysis, including an evaluation of possible threats to the water quality. For this evaluation the following matters are important:

    • depth of the well;
    • is there industry in its near vicinity;
    • which agricultural / horticultural activities are carried out in its near vicinity;
    • are there any landfills in its near vicinity.

    If based on this evaluation no threats are recognized and the mineral water is only intended for own use, then limited research will suffice. WLN can send a sampler to you to sample the mineral water. But it is cheaper to do the sampling yourselves. To this purpose WLN can send you special sampling bottles with preservatives.

    Use for third parties: extensive research required
    If the water is offered to third parties (guests), according to the law, an extensive periodical analysis program must be carried out.

  • Can WLN research what is in the water?

    Yes, we can. It is important to define the research goal. Based on this research goal WLN can advise you which analyses must be executed. The number of analyses that must be carried out determines eventually what the research costs will be.

  • What is the delivery time of a water analysis?

    The standard delivery time is maximum ten work days. In general the common analyses are reported within a week.

  • Is WLN also able to carry out urgent research?

    WLN also executes research which is urgently required. For such research WLN must charge extra. The extra charge can be an urgency charge as a percentage of the regular fee or an urgency charge in the form of an hourly rate.

  • Must I pay for the research costs immediately on delivery of the samples?

    A few days after you have received the analysis report (preferably in digital form), you will receive an invoice for the executed research. The payment period is four weeks.

  • How is (water) research reported?

    You receive by email an analysis report (pdf-file). On request we can send you the analysis report by (normal) mail. We also offer you the opportunity to receive a draft of the analysis report by e-mail beforehand.

  • Can WLN carry out water sampling themselves?

    WLN executes sampling of drinking water, surface water, groundwater, swimming water and waste water. The primary work area for sampling comprises the Dutch provinces of Groningen, Friesland, Drenthe and Overijssel.

  • How do I acquire sampling bottles?

    For an analysis order WLN provides the sampling bottles with preservatives, free of charge. If desired these bottles can be sent to you. If you do the sampling yourselves and want to send the samples back by mail or by courier service, we will despatch the bottles in a cool box with cooling elements.

  • How quickly must samples be delivered?

    This must be done within 24 hours after sampling, for bacteriological research, nutrients (ammonium, nitrates, nitrites), acidity, carbonic acid and carbon dioxide. After sampling, the samples must be transported in dark and cool conditions.

    If the time lag between sampling and delivery at the laboratory is larger than the guideline requires, the analysis can still be carried out, but the value of the analysis will decrease. If the sustainability has been exceeded, this will be stated in the report.

  • How must water samples be transported?

    After sampling, the samples must be transported in dark and cool conditions.

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