Frequent Questions

How is the Bin classification calculated?

Bin classifications are based on the results on average number of oocysts detected in all samples.  When a laboratory analyzes a sample using Method 1623, the results are entered into the DCTS as the total number of organisms found and the total volume examined. If no oocysts are detected, the number found is reported as zero for purposes of calculating the bin concentration.  The DCTS will then use the data to calculate a concentration based on the number of oocysts detected and the volume examined. Because zeros will be included in the calculation, an average less than 1 is possible. For example if 10 L are collected and no oocysts are found, a value of 0 oocysts/L will be averaged with the values from other samples. When the resulting average from all monitoring samples is <0.075 oocysts/L then the system qualifies for bin 1 classification.

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