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Remove any attachments on the faucet. Look for aeration devices, hoses, water purification devices and screens. Turn on the water and allow it to run in a steady stream for 5 to 6 minutes. This will ensure that the line is flushed sufficiently to get a representative sample of the water from the distribution system.
Let the water run until it is cold (two to five minutes) before collecting the sample. Use a sterile sampling bottle provided by a licensed laboratory to collect the water. These bacteriological sampling bottles have tamper-proof seals. Dont use one if the seal has been broken; ask the laboratory for a new one.
General rules of sampling Take extreme care to avoid contaminating the sample container and the water sample. Use a clean, sterile glass or plastic bottle. If the water is chlorinated, ensure the bottle contains sodium thiosulfate in order to stop the action of the disinfectant.
Commonly used devices include electric submersible pumps, bailers, suction-lift pumps, and positive displacement bladder pumps. Bailers are often used to both purge and sample small diameter shallow wells.
Depending on the particular test, the user activates the paper or plastic strip by dipping it into the water sample and swishing it around, or by holding the strip in a stream of water. After waiting for a short time, the user compares the test strip color with a color chart to read the concentration of the chemical.
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General Principles Collect water samples at the same location for both bacteriological and chemical analysis. If meeting holding times for water and bacteriological samples is an issue, field measurements (including flow) may be taken first.
To collect a proper water sample, follow these instructions: Pick up a proper sample bottle. Sample your water when youre able to drop it off within 24 hours. Take the sample from an indoor tap, removing any aerators, screens , or other attachments from the faucet. Turn on the cold water for two to three minutes.
Wear gloves and eye protection when collecting samples. Rinse the bottle and cap three times with sample water and fill the bottle to within one to two inches from the top. Place the sample into a cooler with ice for immediate delivery or shipment to the laboratory. Sterile 125 or 150 mL plastic bottles must be used.

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