Water Sampling Proper water sampling is crucial to accurate testing and treatment.
Accurate results depend on using proper techniques to obtain representative water samples.
The container must hold at least 100 ml. of sample and preferably should contain a small amount of sodium thiosulfate, a chemical that counteracts any chlorine that might be present in the sample. Prior to sampling, disinfect the faucet with household bleach if possible. Run the cold water first for 5 minutes. Then open the sample bottle and fill it to the 100 ml. line with cold water. Take care not to contaminate the interior or lid of the sterile bottle.