Johnson Lake Swimming Beach at Southeast Corner of Lake (Sampling Site 20) |
The table below shows the most recent sampling information
for toxic algae (Microcystin)
and bacteria (E.coli)
,
Samples are typically collected on Monday and posted on the
web site on Thursday or Friday.
On the table below, the level to trigger a toxic
algae Health Alert is 20 parts per billion
for the toxin Microcystin. Health Alerts stay in
effect until the level stays below 20 ppb for
two consecutive weeks |
|
In the Bacteria (E.coli) column, a single sample
of 235 counts (or higher) per 100 ml
is considered a higher risk for illness through
ingestion |
.
Week Starting |
Weekly Health Alert |
Level of Microcystin (ppb) |
E. coli (# per 100 ml) |
May 1, 2017 |
No |
.66 |
2 |
May 8, 2017 |
No |
0 |
3 |
May 15, 2017 |
No |
0.40 |
3 |
May 22, 2017 |
No |
0 |
15 |
May 29, 2017 |
No |
0 |
154 |
June 5, 2017 |
No |
0 |
0 |
June 12, 2017 |
No |
0 |
16 |
June 19, 2017 |
No |
0 |
2 |
June 26, 2017 |
No |
0 |
4 |
July 3, 2017 |
No |
0 |
3 |
July 10, 2017 |
No |
0 |
2 |
July 17, 2017 |
No |
0 |
7 |
July 24, 2017 |
No |
0 |
6 |
July 31, 2017 |
No |
0 |
6 |
August 7, 2017 |
No |
0 |
5 |
August 14, 2017 |
No |
0 |
48 |
August 21, 2017 |
No |
0 |
7 |
August 28, 2017 |
No |
0 |
21 |
September 4, 2017 |
No |
0 |
52 |
September 11, 2017 |
No |
0 |
39 |
September 18, 2017 |
No |
0 |
24 |
September 25, 2017 |
No |
0 |
|