Roaming Shores Lake Management Committee
2019 Algal Toxin and Bacteria Testing Program

Results for Week of 9/09/2019

Microcystin Algal Toxin   E.coli Bacteria
West Beach 1* East Beach 2*   West Beach 1* East Beach 2*
Results below Advisory Level Results below Advisory Level   Results above early warning level Results above early warning level

Note: The warning signs for bacteria will be posted for the remainder of the summer regardless of the tested level.

A green cell indicates that most recent test results for bacteria or microcystin are below the USEPA or OhioEPA criteria for recreational water. A yellow cell indicates a bacteria or microcystin value that has exceeded the Advisory limit. A red cell indicates that the value for microcystin has exceeded the Elevated Advisory limit where contact with the lake should be avoided.

Summary Results for 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

Note: N/A – not available ; testing not done during specified week
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)

Type of Advisory Microcystin Clylindrospermopsin Saxitoxin
Recreational: Public Health Advisory 6 5 0.8
Recreational: No Contact 20 20 3
Drinking Water: Do Not Drink 1 1 0.2
Drinking Water: Do Not Use 20 20 3

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
8/21/2017* 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
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