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+421 903 218 422
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+421 903 218 422

How To Test your Water


Bacteriological/ Microbiological and Chemical sampling is a very important for monitoring water quality. Typical testing methods are listed below.

If you have a specific problem / concern please provide as much information as possible to our staff who will endeavour to assist you in identifying the most suitable tests to perform. 


How to take water samples

It is of paramount importance that you are careful not to contaminate the sample in any way as everyone has a large number of bacteria on their hands all the time. Samples should ideally be taken from the main tap closest to the source / well and before any water treatment units (filters or softeners) or storage tanks.


Materials Required

  • 2 Sterile Water bottles (available from ALS)
  • Cotton Wool
  • Isopropanol (70%) or Methylated Spirits /Alcohol Wipes or equivalent



  1. Remove any anti-splash devices from tap and wipe around the spout with clean cotton wool, to remove all visible signs of contamination.
  2. Turn on the tap and flush to waste steadily, not violently, for at least two minutes. This helps to ensure the pipes are cleared of any stagnant water and therefore that the water tested is representative of the source.
  3. Turn off the tap and sterilise it, using cotton wool and 70% isopropanol or with an alcohol wipe or equivalent.
  4. Flush the tap gently for two minutes – this will remove any excess isopropanol (if used). DO NOT touch any part of the tap again. DO NOT alter the flow rate until you have completed sampling.
  5. With the tap still running remove cap from the bottle (and thus break the sterility seal) – keep the cap pointing downwards and do not put it down. DO NOT open the bottle until the moment it is required for filling. DO NOT touch the inside of the cap or the top of the bottle and DO NOT let the bottle touch the tap.
  6. Hold the bottle at the bottom, at a slight angle under the stream of water, and fill to the neck, avoiding splashing.

DO NOT allow the bottle to overflow, as it contains sodium thiosulphate. Replace the cap immediately making sure that it is properly sealed.


Storage and Transport to the Laboratory

Complete the Analysis Request Form below and return samples to the laboratory as soon as possible - ideally within 2-3 hours of sampling. Please deliver your drinking water samples to one of the ALS locations or a TopTrans collection point. Branches of ALS (collection point in Bratislava and laboratory in Rimavská) and TOPTRANS collection points are listed here.

Only 3 Steps Needed:


Pay fee

Pay the Fee for your test. All major credit and debit cards accepted. We will despatch the sample bottles the same day.


Fill bottles and return to the Lab

Bottles can be dropped off at any of our sites or you can return by post. To view a list of drop off points, please click here.


Receive Results by Email

Certificate of Analysis will be issued to you within 10 working days of receipt of your water bottles by the laboratory.