Bessette E.Coli

  E.coli
primary contact maximum 77/100mL (*)
mid November 2013 2014 2015 Mean
Harris 7 20 25 15
Duteau 12 34 21 20
Vance     8 8
Mid Bessette 13 11 51 19
Lower Bessette 11 10 43 17
mid September        
Harris 190 26 73 71
Duteau 78 170 180 134
Vance     11 11
Mid Bessette 210 120 120 145
Lower Bessette 89 53 64 67
mid August        
Harris 2100 270 230 507
Duteau 380 190 110 200
Vance     29 29
Mid Bessette 290 270 140 222
Lower Bessette 250 290 150 222
mid July        
Harris 80 190 1900 307
Duteau 330 310 600 394
Vance     260 260
Mid Bessette 2 150 2000 84
Lower Bessette 51 100 500 137
late May (freshet)        
Harris 140 20 22 39
Duteau 180 29 55 66
Vance     1 1
Mid Bessette 88 31 41 48
Lower Bessette 56 36 43 44
late April        
Harris 12 24 52 25
Duteau 30 11 43 24
Vance     -- --
Mid Bessette 26 18 45 28
Lower Bessette 17 35 22 24
(*) Primary Contact Maximum :-
B.C. provincial standard for recreation with most of the body in the water and risk of ingestion (e.g. swimming).
The Canadian standard is much higher, being a count of 200/100mL.
Both references speak of the geometric mean of several samples, as opposed to single-sample maximum. The standards quoted here are for the geometric mean, a lower maximum than allowed by a single sample result.