W212 & H212 Preliminary Results

Shipped: July 12, 2021

W212 Preliminary results – Membrane Filtration

Sample NumberOrganismTotal Colony Count - Group Means/Median (cfu/100mL)/MU%
Membrane Filtration Method
Total coliformsThermotolerant coliformsE.coli
W212-1Enterobacter spp.58/55/180/0/00/0/0
W212-2E.coli 56/60/1854/54/19
54/58/21
W212-3E.coli 33/33/1735/33/1732/32/17
W212-4Enterobacter spp.11/12/330/0/00/0/0

MU: measure of uncertainty

W212 Preliminary results – Enzyme Substrate

Sample NumberOrganismTotal Colony Count - Group Means/Median (cfu/100mL)
Enzyme Substrate Method
Total coliformsThermotolerant coliformsE.coli
W212-1Enterobacter species58/580/00/0
W212-2E.coli 60/5755/5360/58*
W212-3E.coli 39/3839/3840/40
W212-4Enterobacter species12/130/00/0

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

W212 Preliminary results – Most Probable Number (MPN)

Sample NumberOrganismTotal Colony Count - Group Means/Median (cfu/100mL)
MPN Method
Total coliformsThermotolerant coliformsE.coli
W212-1Enterobacter species≥23/≥230/00/0
W212-2E.coli ≥23/≥23≥23/≥23
≥23/≥23
W212-3E.coli ≥23/≥23≥23/≥23≥23/≥23
W212-4Enterobacter species9.4/9.20/00/0

W212 Preliminary results – Presence/Absence 

Sample NumberOrganismPresence/Absence Method
Total coliformsThermotolerant coliformsE.coli
W212-1Enterobacter speciesPresentAbsentAbsent
W212-2E.coli PresentPresentPresent
W212-3E.coli PresentPresentPresent
W212-4Enterobacter speciesPresentAbsentAbsent

 

H212 Preliminary results

SamplesOrganismTotal Colony Count Group Means/MedianMU%
H212-1E.coli186/19118.5
H212-2E.coli196/19715.7
H212-3Blank*0/0*0.0
H212-4Enterobacter species*86/8828.6

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

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

Posted in critiques, Water Microbiology Results