Lake Water Testing Program

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Roaming Shores Lake Management Committee
2024 Algal Toxin and Bacteria Testing Program

Week of 09/02/2024

Testing is conducted at the two beaches on Tuesday morning of the designated week. Results may not indicate the conditions on the lake at other locations or times. Bacterial levels may be elevated following a rain event. It is also advisable to avoid direct contact with an active algal bloom.

Microcystin Algal Toxin   E.coli Bacteria
West Beach 1 East Beach 2   West Beach 1* East Beach 2*
         

Note: An asterisk indicates that posting of a warning sign has been recommended.

  No data available
  Results below advisory levels
  Results exceed advisory level
  Toxin level above elevated advisory level AVOID CONTACT WITH LAKE

A document listing Frequently Asked Questions can be found at the following link.
https://www.roamingshores.org/RRA1/wp-content/uploads/LMC-Two-Page-White-Paper.pdf

Summary Results for 2024

 

  Microcystin (ppb)   Bacteria (cfu100mL)
Week of West Beach 1 East Beach 2   West Beach 1 East Beach 2
5/13/2024 NA NA   22 15
5/20/2024 ND ND   51 41
5/27/2024 NA NA   31 33
6/3/2024 NA NA   22 89
6/10/2024 NA NA   387 20
6/17/2024 0.282 0.296   613 261
6/24/2024 ND ND   980 236
7/1/2024 NA NA   102 10
7/8/2024 NA NA   345 43
7/15/2024 ND ND   816 40
7/22/2024 NA NA   548 178
7/29/2024 ND ND   866 270
8/5/2024 NA NA   4350 17300
8/12/2024 0.438 0.353   >2419 488
8/19/2024 ND ND   1990 140
8/26/2024 ND ND   >2419 365
9/2/2024 NA NA   13.5 17.5

Note: NA – not available – testing not done during specified week, ND – Not detected (< 0.3 ppb) (ppb – parts-per-billion; cfu – colony forming units)

Criteria for HAB Toxins (Tested Monthly). Currently, the 2020 State of Ohio Harmful Algal Bloom Response Strategy for Recreational Waters lists values of microcystin above 8 ppb as a Public Health Advisory. Above this level it is suggested that contact with the lake water be avoided. Further information can be viewed at the US EPA’s website for Cyanobacterial Harmful Algal Blooms.  (https://epa.ohio.gov/monitor-pollution/pollution-issues/harmful-algae-blooms).

Criteria for Bacteria (Tested Weekly). Presence for bacteria is monitored by measuring the level of E.coli in the water at the two beaches as is done on most Ohio public beaches.  The USEPA has issued a guidance document which includes a Beach Action Value (BAV) of 235 cfu/100mL. Should the level exceed this value, notifications should be posted.  Heavy rain events are known to increase bacterial levels so caution is advised should this occur. Further information can be found on the EPA web site (https://www.epa.gov/wqc/microbial-pathogenrecreational-water-quality-criteria)

Table I. Numerical thresholds (µg/L or ppb) for Cyanotoxins (2020)

Thresholds Microcystin Anatoxin-a Cylindrospermopsin Saxitoxin
Recreational: Public Health Advisory 8 8 15 0.8
Drinking Water Threshold (children under 6) 0.3 0.3 0.7 0.3
Drinking Water Threshold
(children 6+, and adults)		 1.6 1.6 3 1.6

(For microcystin and saxitoxin, the levels represent the total concentration of all congeners)

Historical Data

2023 Microcystin (ppb)   Bacteria (cfu100mL)
Week of West Beach 1 East Beach 2   West Beach 1 East Beach 2
5/15/2023 NA NA   20 20
5/22/2023 ND ND   480 30
5/29/2023 NA NA   10 12
6/05/2023 NA NA   5 950
6/12/2023 ND ND   9 1200
6/19/2023 NA NA   6 20
6/26/2023 ND ND   NA NA
7/10/2023 ND 0.34   20 170
7/17/2023 0.24 0.47   7680 1150
7/20/2023*       33 77
7/24/2023 ND ND   152 122
7/31/2023 ND 0.27   86 65
8/7/2023 NA NA   57 9
8/14/2023 ND ND   83.9 9.8
8/21/2023 ND ND      
8/28/2023 ND 1.75   23 2300
9/4/2023 0.7 ND   21 548
2022 Microcystin (ppb)   Bacteria (cfu100mL)
Week of West Beach 1 East Beach 2   West Beach 1 East Beach 2
5/16/2022 NA NA   9 4
5/23/2022 ND ND   190 280
5/30/2022 NA NA   18 26
6/6/2022 NA NA   7 5
6/13/2022 ND ND   10 1800
6/20/2022 NA NA   40 70
6/27/2022 0.34 ND   ND 3
7/4/2022 NA NA   120 120
7/11/2022 NA NA   32 12
7/18/2022 ND ND   131 291
7/25/2022 ND ND   5 10
8/1/2022 ND ND   100 10
8/8/2022 ND ND   63 110
8/15/2022 ND ND   51 1
8/22/2022 ND ND   238 112
8/29/2022 ND ND   1300 93
9/5/2022 NA NA   10 10
2021 Microcystin (ppb)   Bacteria (cfu100mL)
Week of West Beach 1 East Beach 2   West Beach 1 East Beach 2
5/17/2021 NA NA   20 10
5/24/2021 < 0.3 < 0.3   30 13
5/31/2021 NA NA   60 100
6/7/2021 0.642 < 0.3   200 30
6/14/2021 NA NA   11 60
6/21/2021 < 0.3 NA   610 1180
6/28/2021 < 0.3 < 0.3   440 1080
7/05/2021 NA NA   20 20
7/12/2021 < 0.3 < 0.3   500 140
7/19/2021 NA NA   120 210
7/26/2021 < 0.3 < 0.3   130 130
8/2/2021 1.34 < 0.3   9800 1570
8/9/2021 1.94 < 0.3   10 70
8/16/2021 4.49 0.792   56 930
8/23/2021 1.72 1.41   100 100
8/30/2021 >25 0.94   46 690
Retest 0.217 2.21   NA NA
9/6/2021 NA NA   3 50
9/13/2021 NA NA   50 140
2020 Microcystin (ppb)   Bacteria (Beach Action Value)
Week of West Beach 1 East Beach 2   West Beach 1 East Beach 2
5/11/2020 N/A N/A   8 30
5/18/2020 Not Detected Not Detected   280 130
5/25/2020 N/A N/A   330 10
6/1/2020 N/A N/A   490 30
6/8/2020 N/A N/A   290 30
6/15/2020 N/A N/A   90 10
6/22/2020 N/A N/A   490 40
6/29/2020 1.118 2.073   80 130
7/6/2020 N/A N/A   150 10
7/13/2020 N/A N/A   2100 10
7/22/2020 2.94 3.305   11,300 2400
7/27/2020 9.86 7.99   200 100
8/5/2020 9.09 >50   11,400 200
#8/10/2020# 7.065 5.320   Not Tested Not Tested
8/12/2020 5.04 5.09   400 10
8/17/2020 1.77 4.82   152 7
8/26/2020 1.75 1.52   2,300 5,600
8/31/2020 N/A N/A   ??? 300
9/07/2020 N/A N/A   400 300
9/16/2020 N/A N/A   500 40
2019 Microcystin (ppb)   Bacteria (Beach Action Value)
Week of West Beach 1 East Beach 2   West Beach 1 East Beach 2
5/13/2019 N/A N/A   120 130
5/20/2019 N.D. (< 0.15) N.D. (< 0.15)   300 200
5/27/2019 N/A N/A   90 260
6/3/2019 N/A N/A   90 140
6/10/2019 N/A N/A   50 190
6/17/2019 N/A N/A   270 230
6/24/2019 0.348 2.966   220 120
7/1/2019 N/A N/A   1730 37
7/8/2019 N/A N/A   50 90
7/15/2019 3.693 2.266   620 540
7/22/2019 N.A N.A.   440 360
7/29/2019 10.83 6.97   560 880
8/5/2019 3.084 3.260   10000 1300
8/12/2019 40.20 31.69   3900 2300
8/19/2019 10.28 8.33   1700 600
8/26/2019 5.49 11.60   5300 700
9/2/2019 3.88 4.30   310 60
9/9/2019 5.59 5.45   900 2700
2018 Microcystin (ppb)   Bacteria (Beach Action Value)
Week of West Beach 1 East Beach 2   West Beach 1 East Beach 2
5/7/2018 N/A N/A   240 88
5/14/2018 N/A N/A   35 52
5/21/2018 < 0.15 < 0.15   5 260
5/28/2018 N/A N/A   27 24
6/4/2018 N/A N/A   80 150
6/11/2018 N/A N/A   110 90
6/18/2018 1.962 1.617   73 70
6/25/2018 N/A N/A   51 190
7/2/2018 N/A 0.214   900 560
7/9/2018 N/A N/A   230 190
7/16/2018 2.055 0.315   29 190
7/23/2018 N/A N/A   730 190
7/30/2018 <0.15 0.22   38 60
8/6/2018 N/A N/A   5,500 1,600
8/13/2018 3.745 0.754   210 25
8/20/2018 N/A N/A   560 3,400
8/27/2018 2.525 1.605   350 420
9/03/2018 N/A N/A   720 570
9/10/2018 N/A N/A   1,400 3,000
9/17/2018 N/A N/A   600 800
2017

Microcystin (ppb)

  

Bacteria (Beach Action Value)
Week of West Beach 1 East Beach 2   West Beach 1 East Beach 2
5/15/2017 < 0.10 < 0.10   Below BAV Below BAV
5/23/2017 n/a n/a   Below BAV Below BAV
5/30/2017 n/a n/a   Below BAV Below BAV
6/5/2017 n/a n/a   Below BAV Below BAV
6/12/2017 n/a n/a   Below BAV Below BAV
6/19/2017 <0.10 0.160   Below BAV Below BAV
6/26/2017 n/a n/a   Below BAV Below BAV
7/3/2017 n/a n/a   Below BAV Below BAV
7/10/2017 n/a n/a   Below BAV Below BAV
7/17/2017 1.610 0.769   Below BAV Below BAV
7/24/2017 n/a n/a   Below BAV Below BAV
7/31/2017 n/a n/a   Below BAV Below BAV
8/7/2017 n/a n/a   Above BAV Below BAV
8/14/2017 n/a n/a   Below BAV Below BAV
8/21/2017 42.0 40.2   Below BAV Below BAV
8/25/2017* 14.64 11.44   Below BAV Below BAV
8/28/2017 2.92 6.59   Below BAV Below BAV
9/04/2017 2.20 4.09   Below BAV Below BAV
9/11/2017 n/a n/a   Below BAV Below BAV
9/18/2017 n/a n/a   Below BAV Below BAV
Location Date Sampled Date Tested Results parts /billion (ppb) Toxin Tested
LRR – Beach 1 5/23/2016 5/23/2016 2.617 Microcystin-LR
LRR – Beach 2 5/23/2016 5/23/2016 1.553 Microcystin-LR
LRR – Beach 1 5/23/2016 5/23/2016 <0.05 Clylindrospermopsin
LRR – Beach 2 5/23/2016 5/23/2016 <0.05 Clylindrospermopsin
LRR – Beach 1 5/23/2016 5/23/2016 <0.02 Saxitoxin
LRR – Beach 2 5/23/2016 5/23/2016 <0.02 Saxitoxin
LRR – Beach 1 6/23/2016 6/23/2016 <0.10 Microcystin-LR
LRR – Beach 2 6/23/2016 6/23/2016 <0.10 Microcystin-LR
LRR – Beach 1 7/25/2016 7/25/2016 0.107 Microcystin-LR
LRR – Beach 2 7/25/2016 7/25/2016 <0.10 Microcystin-LR
LRR – Beach 1 8/10/2016 8/10/2016 <0.10 Microcystin-LR
LRR – Beach 2 8/10/2016 8/10/2016 <0.10 Microcystin-LR
Location Date Sampled Date Tested Results parts /billion (ppb) Toxin Tested
LRR – Beach 1 9/1/2015 9/1/2015 1.589 microcystin
LRR – Beach 2 9/1/2015 9/1/2015 1.184 microcystin
LRR – Beach 1 9/1/2015 9/1/2015 <0.05 clylindrospermopsin
LRR – Beach 2 9/1/2015 9/1/2015 <0.05 clylindrospermopsin
LRR – Beach 1 9/1/2015 9/1/2015 <0.02 saxitoxin
LRR – Beach 2 9/1/2015 9/1/2015 <0.02 saxitoxin
LRR – Beach 1 7/16/2015 7/16/2015 2.105 microcystin
LRR – Beach 2 7/16/2015 7/16/2015 0.148 microcystin
LRR – Beach 1 7/16/2015 7/16/2015 <0.05 clylindrospermopsin
LRR – Beach 2 7/16/2015 7/16/2015 <0.05 clylindrospermopsin
LRR – Beach 1 7/16/2015 7/16/2015 <0.02 saxitoxin
LRR – Beach 2 7/16/2015 7/16/2015 <0.02 saxitoxin
LRR – Beach 1 5/19/2015 5/19/2015 <0.10 microcystin
LRR – Beach 2 5/19/2015 5/19/2015 <0.10 microcystin
LRR – Beach 1 5/19/2015 5/19/2015 <0.05 clylindrospermopsin
LRR – Beach 2 5/19/2015 5/19/2015 <0.05 clylindrospermopsin
LRR – Beach 1 5/19/2015 5/19/2015 <0.02 saxitoxin
LRR – Beach 2 5/19/2015 5/19/2015 <0.02 saxitoxin
Location Date Sampled Date Tested Results                 parts /billion (ppb) Toxin Tested
LRR – Beach 1 8/26/2014 8/26/2014 3.24 microcystin
LRR – Beach 2 8/26/2014 8/26/2014 3.05 microcystin
LRR – Beach 1 8/27/2014 8/28/2014 <0.05 clylindrospermopsin
LRR – Beach 2 8/27/2014 8/28/2014 <0.05 clylindrospermopsin
LRR – Beach 1 8/27/2014 8/28/2014 0.026 saxitoxin
LRR – Beach 2 8/27/2014 8/28/2014 <0.02 saxitoxin
LRR – Beach 1 8/5/2014 8/6/2014 1.61 microcystin
LRR – Beach 2 8/5/2014 8/6/2014 0.79 microcystin
LRR – Beach 1 8/5/2014 8/6/2014 <0.05 clylindrospermopsin
LRR – Beach 2 8/5/2014 8/6/2014 0.075 clylindrospermopsin
LRR – Beach 1 8/5/2014 8/6/2014 0.02 saxitoxin
LRR – Beach 2 8/5/2014 8/6/2014 <0.02 saxitoxin
LRR – Beach 1 6/26/2014 6/27/2014 0.758 microcystin
LRR – Beach 2 6/26/2014 6/27/2014 0.951 microcystin
LRR – Beach 1 6/26/2014 6/27/2014 <0.05 clylindrospermopsin
LRR – Beach 2 6/26/2014 6/27/2014 <0.05 clylindrospermopsin
LRR – Beach 1 6/26/2014 6/27/2014 0.02 saxitoxin
LRR – Beach 2 6/26/2014 6/27/2014 <0.02 saxitoxin
LRR – Beach 1 5/20/2014 5/21/2014 <0.15 microcystin
LRR – Beach 2 5/20/2014 5/21/2014 <0.15 microcystin
LRR – Beach 1 5/20/2014 5/21/2014 0.56 clylindrospermopsin
LRR – Beach 2 5/20/2014 5/21/2014 0.30 clylindrospermopsin
LRR – Beach 1 5/20/2014 5/21/2014 <0.02 saxitoxin
LRR – Beach 2 5/20/2014 5/21/2014 <0.02 saxitoxin