Roaming Shores Lake Management Committee
2022 Algal Toxin and Bacteria Testing Program

Week of 09/05/22

Testing is conducted at the two beaches on Wednesday 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 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

Note: NA – not available – testing not done during specified week, ND – Not detected (< 0.03 ppb)

Criteria for HAB Toxins (Tested Monthly). Currently, the 2016 State of Ohio Harmful Algal Bloom Response Strategy for Recreational Waters lists values above 6 ppb as a Public Health Advisory. Above 20 ppb, an Elevated Public Health Advisory is recommended and suggests that contact with the lake water should be avoided.

Further information can be viewed at the US EPA’s website for Cyanobacterial Harmful Algal Blooms. (www2.epa.gov/nutrient-policy-data/cyanobacterial-harmful-algal-blooms-cyanohabs#tab-7).

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)

Type of Advisory 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)

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

“*” – retested on Friday 8/25/17

2016

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

2015

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

2014

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