Roaming Shores Lake Management Committee
2023 Algal Toxin and Bacteria Testing Program
Week of 09/04/23
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 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 | |
Note * – resample on 7/20 due to high numbers
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)
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 | |
“*” – 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 |
