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Beach Status -> Kennebunk Area-> Riverside (Ogunquit)-> Monitoring Data

Actual Enterococci Values Measured At Sites by Date:

Sample DateEnterococci CountTide StageWater TemperatureAir TemperatureSalinity
8/30/201898 MF  20.827.130
8/28/2018226 MF  20.92830
8/21/2018<10 HE  21.12032
8/16/2018146 L  21.426.129
8/14/20181092 LF  19.819.829
8/7/2018<10 ME  15.526.233
8/2/2018<10 MF  19.631.531
7/31/2018457 L  19.422.417
7/24/2018<10 HF  17.822.131
7/17/201896 L  19.420.931
7/10/201810 H  1322.530
7/3/201820 L  18.72328
6/26/2018<10 MF  15.917.629
6/19/201898 LE    33
8/30/2017<10 L  17.518.131
8/22/201730 HE  17.829.330
8/16/2017<10 MF  22.728.130
8/9/201710 HE  15.829.332
8/1/201710 L  22.128.830
7/25/201710 ME  19.524.232
7/18/2017<10 MF  23.727.527
7/11/2017<10 H  11.126.132
7/6/201710 ME  12.624.932
6/27/201764 MF  14.619.130
6/20/201720 L  17.126.928
6/13/201741 MF  2024.922
6/6/201752 ME  10.38.830
9/6/201652 MF  18.41932
8/30/2016<10 HF  1620.534
8/23/201631 L  16.417.634
8/16/201631 HF  19.821.935
8/9/201610 LE  16.22035
8/2/201610 HF  20.12233
7/26/201652 LE  20.125.232
7/19/201631 HF  17.922.134
7/12/2016<10 ME  17.32134
7/5/201696 MF  16.622.832
6/28/2016<10 ME  11.118.635
6/22/2016<10 HE  9.515.535
6/21/2016383 MF  16.220.931
6/14/201610 ME  12.117.432
6/8/2016<10 HF  142238
6/7/2016435 MF  15.216.726
5/31/2016<10 ME  13.523.831
9/2/2015<10 HF  22.328.832
9/1/2015135 MF  18.520.131
8/25/201520 ME  20.121.533
8/18/201520 MF  19.125.332
8/11/2015<10 H  15.816.734
8/4/201598 LF  13.815.833
7/28/2015<10 HE  18.620.832
7/22/201520 MF  222631
7/21/2015189 L  18.817.628
7/14/2015<10 HF  17.91832
7/7/201552 L  15.720.231
7/4/2015  MF  13.815.833
6/30/2015<10 HF  13.420.632
6/23/2015<10 LE  15.115.931
6/16/201575 MF  13.114.633
6/9/2015<10 ME  10.217.833.3
6/5/2015<10 MF  1114 
6/4/2015379 MF  11.412.317
8/26/201420 MF  19.121.126
8/19/2014<10 ME  16.31832
8/13/201452 ME  18.719.631
8/12/2014512 MF  19.118.131
8/5/201441 ME  16.62130
7/30/2014<10 HF  1526.631
7/29/2014631 MF  17.419.521
7/22/201410 ME  17.520.831
7/8/2014<10 ME  12.224.531
7/1/201441 MF  17.229.128
5/28/201310 LF  10.613.833
8/28/201231 H  14.318.932
8/23/201220 -     
8/21/2012336 MF  18.319.230
8/14/2012<10 HE  17.925.733
8/10/201263 LF  21.422.632
8/7/2012<10 L  17.721.632
7/31/201210 HF  15.22033
7/24/201220 LF  15.321.933
7/17/201210 MF  18.321.231
7/10/201210 LE  15.618.231
7/3/2012441 MF  16.117.430
6/28/2012<10 LF  19.625.523
6/26/2012187 LE  14.817.528
6/20/2012<10 HE  17.624.632
6/19/2012145 MF  16.314.322
6/12/2012<10 ME  13.915.731
6/7/201252 LF  13.313.719
6/5/2012404 MF  11.99.811
5/29/2012<10 ME  15.614.631
9/1/2011<10 HF  16.819.836
8/30/2011537 MF  15.317.822
8/23/201110 ME  15.119.132
8/17/2011<10 H  16.225.933
8/16/20112481 MF  17.116.521
8/9/2011<10 ME  16.520.632
8/3/2011<10 HF  20.32334
8/2/2011309 MF  19.32031
7/26/201120 ME  15.718.333
7/19/201152 LF  17.123.732
7/12/201110 H  13.419.632
7/6/2011<10 HF  17.13531
7/5/2011771 LF  16.924.2 
6/28/2011<10 H  14.317.332
6/21/2011<10 L  14.920.730
6/14/201163 H  12.11231
6/8/201162 LF  17.22232
6/7/2011122 LF  1418.130
5/31/201110 MF  12.816.830
8/31/201020 L  19.226.530
8/24/201031 MF  18.318.234
8/17/201010 LE  14.321.533
8/10/201098 HF  14.324.931
8/3/201010 LE  17.921.432
7/27/201031 MF  17.522.533
7/20/201010 ME  1621.432
7/14/201095 HE  16.619.632
7/13/2010187 MF  18.321.331
7/6/2010<10 ME  14.131.732
6/30/201063 ME  15.3 33
6/29/2010146 MF  17.717.728
6/22/2010<10 ME  12.921.732
6/16/201010 HF  15.42033
6/15/2010305 MF  14.618.125
6/10/201010 ME  11.713.933
6/8/2010<10 HE  10.915.631
6/1/201020 LF  14.320.628
9/1/2009<10 H  17.617.134
8/26/200910 MF  19.12833
8/25/2009512 L  20.222.425
8/18/200910 H  15.421.431
8/14/200930 MF  23.823.723
8/13/2009241 L  19.320.121
8/11/2009134 MF  17.220.119
8/4/2009<10 HF  16.519.531
7/29/200997 MF  25.329.610
7/28/2009135 L  18.522.219
7/21/200910 HF  17.618.428
7/14/2009<10 LE  12.115.932
7/8/200920 HE  17.216.927
7/7/200985 MF  1614.617
6/30/200941 ME  15.114.525
6/26/200941 ME  14.923.331
6/25/2009110 LF  15.517.117
6/23/2009295 MF  15.417.415
6/16/200910 ME  14.914.526
6/9/200963 MF  14.513.228
6/2/2009<10 ME  10.118.232
5/19/200910 LF  14.915.315
8/27/2008<10 ME  15.220.233
8/20/200841 MF  17.617.232
8/13/2008<10 H    30
8/6/200863 L  1919.127
7/30/200810 H  14.72432
7/23/200831 LF  18.821.828
7/16/2008<10 HF  14.32033
7/9/200810 LE  152632.5
7/2/200820 HF  16.424.731
6/27/2008<10 ME  13.422.431
6/25/2008193 L  1518.230
6/18/200852 MF  15.814.630
6/11/2008<10 ME  17.422.731
6/5/2008<10 H  914.533
6/4/200886 MF  12.713.632
10/17/200710 L  11.118.332
9/19/2007<10 LE  12.814.534.5
9/17/2007  L  11.118.332
8/30/200763 HE  18.331.134
8/29/2007246 MF  17.117.833
8/27/200731 ME  17.623.435.5
8/23/200720 LE  17.719.932
8/22/2007<10 ME  14.710.934
8/16/2007<10 ME  16.826.434
8/15/2007108 LF  16.916.632
8/8/200720 H  182135
8/7/20071314 L  20.42425
8/2/200741 -     
8/1/2007160 L  18.42332
7/25/2007<10 LE  18.122.134
7/19/200774 HF  17.617.629.5
7/18/200741 MF  14.520.231
7/12/2007<10 ME  16.227.731
7/11/2007<10 H  16.916.532
7/5/200786 L  15.319.132
6/27/2007<10 HF  13.427.633
6/20/200773 LF  17.822.728
6/13/200774 HF  16.91332
6/7/200720 H  11.32233
6/6/2007650 LF  14.917.85
5/17/200763 LE  10.19.323
9/6/2006<10 HF  17.51732
8/30/2006<10 ME  17.416.733
8/24/2006<10 ME  152033
8/23/2006185 LF  17.41830
8/16/2006<10 ME  131737
8/10/200641 ME  15.52534
8/9/2006563 MF  162130
8/2/200695 ME  13.524.536
7/27/2006<10 ME  17.725.532
7/26/2006216 LF  16.52227
7/19/2006<10 HE  17.52232
7/15/200620 ME  1725.132
7/14/2006728 LE  162024
7/12/20061354 MF  162427
7/5/2006<10 HE  122034
6/29/2006<10 HF  132334
6/28/2006300 L  151827
6/21/200610 H  1415.634
6/14/200698 L  151720
6/7/200630 HF  51229
8/31/200541 MF  1421.134
8/24/200531 ME  15.515.632
8/17/200510 HF  1615.532
8/10/200540 ME  1421.732
8/3/2005<10 ME  1826.632
8/3/2005<10 MF  182028
7/27/200533 ME  13.525.634
7/20/200516 ME  1826.733
7/20/2005200 MF  182130
7/13/200585 ME  151533
7/6/2005200 MF  162026
6/29/200527 ME  1621.130
6/23/2005<10 H  1418.832
6/22/2005117 MF  1118.330
6/17/2005<10 H  121030
6/15/200567 ME  12.51032
6/9/2005<10 ME  1523.8 
6/8/2005120 MF  1418.325
6/1/2005<10 HE  1110.5528
9/2/2004<10 HE     
9/1/2004450 LF  15.515.530
8/25/2004<10 HE  1412.233
8/18/2004<10 LF  1616.625
8/11/2004<10 H  1220.635
8/4/2004<10 L  142032
7/28/2004<10 H  161533
7/21/2004<10 LE  1617.433
7/14/200410 MF  1514.435
7/7/2004<10 ME  1320.631
6/30/2004<10 MF  121532
6/23/2004<10 ME  1218.332
6/16/200410 MF  1418.325
6/9/2004<10 ME   19.435
6/2/200430 MF  10.51120
9/3/200330 ME  1413.935
8/28/200340 ME   22.2 
8/27/200380 MF  162033
8/20/200340 ME  1519.433
8/13/200340 LF  17.519.530
8/6/2003<10 ME  8.518.333
7/30/200330 LF  1015.535
7/23/200370 HE  1218.33.5
7/16/2003<10 L  1616.732
7/9/200330 H  1521.633
7/2/2003<10 L  1215.532
6/25/2003<10 HF  1316.735
6/18/2003<10 LE  913.935
6/11/2003<10 HF  1113.8835
6/4/2003<10 L  1213.8822
Sample DateEnterococci CountTide StageWater TemperatureAir TemperatureSalinity
5/28/201310 LF  11.71426
8/28/201252 H  15.318.732
8/23/201210 -     
8/21/2012299 LF  17.91831
8/14/2012<10 H  17.824.4 
8/10/2012<10 LF  21.722.832
8/7/201210 L  1821.831
7/31/201210 HF  15.320.233
7/24/201241 L  14.52233
7/17/2012<10 HF  18.72231
7/10/2012<10 LE  15.418.431
7/3/201252 MF  14.618.732
6/28/201220 LF  19.824.920
6/26/2012243 LE  14.717.428
6/20/2012<10 HE  17.424.632
6/19/2012134 MF  15.715.730
6/12/2012<10 ME  13.717.730
6/7/2012135 LF  13.614.520
6/5/2012520 MF  12.210.812
5/29/201220 ME  15.714.731
9/1/2011<10 HF  16.619.732
8/30/2011528 MF  15.31927
8/23/2011<10 ME  14.918.133
8/17/2011<10 H  16.425.634
8/16/20112143 MF  17.216.921
8/9/201120 ME  16.51932
8/3/201110 HF  20.423.134
8/2/2011389 MF  19.319.331
7/26/201131 ME  15.818.132
7/19/201110 MF  1825.830
7/12/2011<10 HE  12.417.933
7/6/2011<10 HF  17.334.230
7/5/2011432 MF  18.724.325
6/28/2011<10 H  1416.531
6/21/201130 L  15.321.930
6/14/2011<10 H  13.911.931
6/8/201163 LF  18.32233
6/7/2011121 L  13.816.730
5/31/2011<10 HF  13.419.729
8/31/201085 L  18.826.528
8/24/201031 MF  18.418.533
8/17/2010<10 ME  14.321.433
8/16/201010 L  16.42132
8/12/2010171 MF  17.820.133
8/10/2010160 MF  14.924.931
8/3/201041 LE  17.72132
7/27/201041 MF  16.823.427
7/20/201010 ME  15.821.333
7/16/2010393 L  19.421.625
7/14/2010148 HE  16.518.533
7/13/2010275 MF  18.221.531
7/6/201010 ME  13.131.233
6/29/201063 MF  17.516.928
6/22/2010<10 HE  1318.431
6/16/2010<10 H  15.317.433
6/15/2010441 MF  14.918.425
6/10/201031 ME  11.313.533
6/8/2010<10 HE  11.216.531
6/1/201010 LF  14.120.530
9/1/2009<10 H  17.515.834
8/26/200931 MF  22.428.827
8/25/2009448 L  19.62226
8/18/200931 H  1621.130
8/14/200920 MF  23.62422
8/13/2009282 LE  19.219.523
8/11/2009259 MF  17.122.520
8/4/200920 HF  15.718.732
7/29/200975 MF  2530.19
7/28/2009132 LE  18.724.520
7/21/200930 HF  17.418.430
7/14/200920 LE  12.316.234
7/8/200941 HE  16.416.128
7/7/2009228 MF  16.114.716
6/30/200941 ME  15.214.326
6/26/200920 HE  14.624.428
6/25/2009109 MF  1618.716
6/23/2009345 MF  15.417.416
6/16/2009<10 ME  14.613.828
6/9/200963 MF  14.41328
6/2/200910 ME  9.317.933
5/19/2009<10 L  1411.719
8/27/200831 HE  1516.530
8/20/2008<10 MF  17.518.231
8/13/200810 H    30
8/6/200810 LE  18.719.630
7/30/200831 H  14.823.432
7/23/200810 L  18.62130
7/16/2008<10 HF  14.918.634
7/9/2008<10 LE  14.228.130
7/2/200831 HF  17.917.731
6/27/2008<10 ME  10.822.132
6/25/2008228 LE  14.117.825
6/18/200810 MF  16.715.830
6/11/2008<10 ME  17.721.931
6/5/200830 H  10.11432
6/4/2008135 MF  12.613.732

Beach Program Water Quality Standards

The exceedance criteria, or level at which a sample fails, is 104 Enterococci bacteria per 100 milliliters of sample water, or Enterococci levels exceed the geometric mean of 35 counts of Enterococci per 100 mL of water in at least five samples collected over a 30-day period. This is one consideration for placing advisories at the beach. For the other considerations for advising against recreational water activities or for closing a beach click on How Beach Advisories are Determined.

The Maine Healthy Coastal Beaches Program is providing the State of Maine with a system to monitor public beaches and notify the public when there is a potentially hazardous condition.

The Maine Healthy Coastal Beaches Program ensures healthy, informed opportunities for swimming and other recreational water activities along the coast of Maine. Monitoring coastal water quality for swimming and other water contact usage is the responsibility of the local jurisdiction. It is not a mandated requirement from the State, nor does the State of Maine monitor public beaches other than those of their ownership.

Maine has 46 public beaches and recreational waters on its coast, of which 36 of these are participating in the Maine Healthy Coastal Beaches Program. The Maine Healthy Coastal Beaches Program is currently monitoring these waters, educating the public about potential health risks at these waters, and notifying the public when a disease-causing microorganism is present and may pose a health risk.

Maine’s Healthy Coastal Beaches Program will provide a current list of coastal beach advisories from participating towns/State Parks throughout the state. To view current beach advisories, go to Today’s Beach Status.

The towns and State Parks currently post beach advisories when sample analyses result in bacteria levels above the state standard, and the conditions warrant it, indicating the possible presence of disease-causing organisms. These advisories are recommendations to the public to avoid water contact activities at the beach until further analyses reveal safe conditions.

A decision to close or post beaches is based upon a Risk-Based Assessment Matrix tool to beaches for ongoing management decisions.

Beaches are not “closed” simply on the exceedance of the bacterial count, but on the Risk Assessment Matrix factors which includes bather numbers, time of last rainfall, and history of known problems. This is a coordinated decision between the Beach Manager, Program Coordinator, and State Epidemiologist.

The town/State Park beach managers may use their own discretion to actively close a beach to the public. The municipality/State Park must notify the Maine Healthy Coastal Beaches Program of their intentions to close or put up an advisory at a particular beach by indicating this on the on-line database.
The Healthy Coastal Beaches Program has produced a sign with attachments for advisory or closure to indicate a beach advisory. Click here to view samples of the signs.

What Is The Geometric Mean?

Many wastewater dischargers, as well as regulators who monitor swimming beaches and shellfish areas, must test for and report fecal coliform bacteria concentrations. Often, the data must be summarized as a "geometric mean" (a type of average) of all the test results obtained during a reporting period. Typically, public health regulations identify a precise geometric mean concentration at which shellfish beds or swimming beaches must be closed.

A geometric mean, unlike an arithmetic mean, tends to dampen the effect of very high or low values, which might bias the mean if a straight average (arithmetic mean) were calculated. This is helpful when analyzing bacteria concentrations, because levels may vary anywhere from 10 to 10,000 fold over a given period.

How do you calculate a geometric mean? The easiest way to think of the geometric mean is that it is the average of the logarithmic values, converted back to a base 10 number.

However, the actual formula and definition of the geometric mean is that it is the n-th root of the product of n numbers, or:
Geometric Mean = n-th root of (X1)(X2)...(Xn) Where X1, X2, etc. represent the individual data points, and n is the total number of data points used in the calculation.

Geometric Mean of Enterococci Counts
For Riverside (Ogunquit):


 

Click For more information on the Geometric Mean.

How will I know if it’s safe to swim at my local beach?

There are several ways to determine whether it’s safe to swim at a beach.

  • Check the Today’s Beach Status to see if the beach is listed. For further information, contact the Maine Healthy Coastal Beaches Program.
  • Contact the local beach manager for that town or State Park. Staff will be able to give you information on whether the beach is part of the Healthy Coastal Beaches Program and if water quality is monitored at that beach.
  • Look for any advisory/closure signs or other signs posted at the beach entrance or on the lifeguard stands. If there are no advisories (orange) or closures (red) posted, but there is an open (green) sign, this will indicate that this beach is open for recreation.
  • Contact your local health official. A health official may be able to inform you whether a beach advisory has been posted at the beach you plan to visit.