W213 & H213 Preliminary Results

Shipped: October 25, 2021

W213 Preliminary results – Membrane Filtration

Sample NumberOrganismTotal Colony Count - Group Means/Median (cfu/100mL)/MU%
Membrane Filtration Method
Total coliformsThermotolerant coliformsE.coli
W213-1E.coli 14/14/24.415/16/27.513/13/24.6
W213-2E.coli 26/26/18.130/29/15.5
26/26/20.9
W213-3Enterobacter spp.51/53/16.50/0/00/0/0
W213-4No organisms0/0/00/0/00/0/0

MU: measure of uncertainty

W213 Preliminary results – Enzyme Substrate

Sample NumberOrganismTotal Colony Count - Group Means/Median (cfu/100mL)
Enzyme Substrate Method
Total coliformsThermotolerant coliformsE.coli
W213-1E.coli 17.7/18.516.2/15.615.9/17.3
W213-2E.coli 30.4/29.630.1/28.826.7/27.5
W213-3Enterobacter species53.8/50.60/00/0
W213-4No organisms0/00/00/0

W213 Preliminary results – Most Probable Number (MPN)

Sample NumberOrganismTotal Colony Count - Group Means/Median (cfu/100mL)
MPN Method
Total coliformsThermotolerant coliformsE.coli
W213-1E.coli15/1213/1215/12
W213-2E.coli 21.3/2321.3/23
21.3/23
W213-3Enterobacter species≥23/≥230/00/0
W213-4No organisms0/00/00/0

W213 Preliminary results – Presence/Absence

Sample NumberOrganismPresence/Absence Method
Total coliformsThermotolerant coliformsE.coli
W213-1E.coli PresentPresentPresent
W213-2E.coli PresentPresentPresent
W213-3Enterobacter species PresentAbsentAbsent
W213-4No organismsAbsentAbsentAbsent

H213 Preliminary results

SamplesOrganismTotal Colony Count Group Means/MedianMU%
H213-1Enterobacter species60/6015.4
H213-2E.coli94/8526.6
H213-3Enterobacter species73/6832.6
H213-4E.coli97/8434.9

Posted in critiques, Water Microbiology Results