W211 & H211 Preliminary Results

Shipped: April 12, 2021

W211 Preliminary results – Membrane Filtration

Sample NumberOrganismTotal Colony Count - Group Means/Median (cfu/100mL)/MU%
Membrane Filtration Method
Total coliformsThermotolerant coliformsE.coli
W211-1E.coli 16/16/2116/17/2016/16/21
W211-2Enterobacter species34/36/22.40/0/0
0/0/0
W211-3Blank0/0/00/0/00/0/0
W211-4E.coli 33/31/2231/32/2732/31/22

MU% – Measurement Uncertainty percentage calculated for Membrane Filtration & HPC methods only

W211 Preliminary results – Enzyme Substrate

Sample NumberOrganismTotal Colony Count - Group Means/Median (cfu/100mL)
Enzyme Substrate Method
Total coliformsThermotolerant coliformsE.coli
W211-1E.coli 16/1616/16*16/16
W211-2Enterobacter species35/340/0
0/0
W211-3Blank0/00/00/0
W211-4E.coli 33/3330/28*30/32

*outliers were not included in group mean/median/MU calculations

W211 Preliminary results – Most Probable Number (MPN)

Sample NumberOrganismTotal Colony Count - Group Means/Median (cfu/100mL)
MPN Method
Total coliformsThermotolerant coliformsE.coli
W211-1E.coli 16.8/16.116.1/16.114.7/16.0
W211-2Enterobacter species≥23/≥230/0
0/0
W211-3Blank0/00/00/0
W211-4E.coli ≥23/≥23≥23/≥23≥23/≥23

*outliers were not included in group mean/median/MU calculations

W211 Preliminary results – Presence/Absence

Sample NumberOrganismPresence/Absence Method
Total coliformsThermotolerant coliformsE.coli
W211-1E.coli PresentPresentPresent
W211-2Enterobacter speciesPresentAbsent
Absent
W211-3BlankAbsentAbsentAbsent
W211-4E.coli PresentPresentPresent

*outliers were not included in group mean/median/MU calculations

 

H211 Preliminary results

SamplesOrganismTotal Colony Count Group Means/Median/MU%
H211-1E.coli117/116/15
H211-2Enterobacter species84/88/25
H211-3Enterobacter species41/40/25
H211-4E.coli*61/66/*25

MU (%): Measurement Uncertainty in percentage outliers excluded in group means

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