Bessette E.Coli
E.coli | |||||||||||||
primary contact maximum 77(*) | |||||||||||||
mid November | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | g-Mean |
Harris | 7 | 20 | 25 | 10 | 50 | 50 | 130 | 57 | 82 | 23 | 17 | 30 | |
Duteau | 12 | 34 | 21 | 19 | 10 | 7 | 12 | 46 | 54 | 19 | 24 | 20 | |
Vance | 8 | 4 | -- | -- | 2 | 2 | 5 | 1 | 15 | 4 | |||
Mid Bessette | 13 | 11 | 51 | 18 | 42 | 60 | 67 | 131 | 60 | 93 | 34 | 41 | |
Lower Bessette | 11 | 10 | 43 | 30 | 76 | 91 | 77 | 35 | 8 | 66 | 11 | 30 | |
geometric Mean | 10.5 | 16.5 | 24.7 | 13.3 | 35.5 | 37.2 | 27.7 | 29.9 | 25.4 | 19.3 | 19 | #VALUE! | |
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 | |||||||||
geometric Mean | 129.0 | 72.8 | 64.4 | ||||||||||
mid August | |||||||||||||
Harris | 2100 | 270 | 230 | 570 | 580 | 900 | 1000 | 489 | 297 | 271 | 293 | 496 | |
Duteau | 380 | 190 | 110 | 240 | 1000 | 77 | 210 | 101 | 11200 | 305 | 82 | 281 | |
Vance | 29 | 36 | 240 | 27 | 96 | 15 | 59 | 54 | 56 | 49 | |||
Mid Bessette | 290 | 270 | 140 | 370 | 710 | 270 | 560 | 224 | 639 | 511 | 107 | 318 | |
Lower Bessette | 250 | 290 | 150 | 140 | 240 | 230 | 340 | 109 | 115 | 307 | 74 | 184 | |
geometric Mean | 490.4 | 251.8 | 109.0 | 191.1 | 473.2 | 163.3 | 328.7 | 112.6 | 428.4 | 233.9 | 101 | #VALUE! | |
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 | |||||||||
geometric Mean | 40.5 | 172.4 | 784.1 | ||||||||||
mid May (freshet) | |||||||||||||
Harris | 140 | 20 | 22 | 23 | 48 | 150 | 33 | 23 | 102 | 119 | 24 | 687 | 58 |
Duteau | 180 | 29 | 55 | 82 | 44 | 80 | 200 | 52 | 824 | 33 | 215 | 210 | 100 |
Vance | 1 | 22 | 4 | 2 | 1 | 1 | <1 | 423 | 2 | 5 | 4 | ||
Mid Bessette | 88 | 31 | 41 | 71 | 150 | 33 | 130 | 40 | 127 | 43 | 72 | 248 | 72 |
Lower Bessette | 56 | 36 | 43 | 89 | 39 | 37 | 110 | 53 | 228 | 40 | 105 | 291 | 72 |
geometric Mean | 105.6 | 28.4 | 18.4 | 48.3 | 33.9 | 31.1 | 39.4 | 19.0 | 222.1 | 77.8 | 38 | 139 | |
mid April | |||||||||||||
Harris | 12 | 24 | 52 | 25 | |||||||||
Duteau | 30 | 11 | 43 | 24 | |||||||||
Vance | -- | -- | |||||||||||
Mid Bessette | 26 | 18 | 45 | 28 | |||||||||
Lower Bessette | 17 | 35 | 22 | 24 | |||||||||
geometric Mean | 20.0 | 20.2 | 38.6 |
(*) Primary Contact Maximum :-
B.C. provincial standard for recreation with most of the body in the water and risk of ingestion (e.g. swimming)
It now refers to the Canadian standard, but used to be lower. It's now 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.