Ossining Beach

Ossining Beach

Physical/Chemical Data

Physical, chemical and biological properties of the surface water that are measured continuously while the patrol boat is underway.

Entero Count (fecal indicator) and Rainfall

67 Samples taken

Sample Date [i] Enterococcus Count

Entero Count

Enterococcus (“Entero”) is a fecal indicating bacterium that lives in the intestines of humans and other warm-blooded animals. It is the EPA preferred indicator for sewage contamination.

Quality Rain, day of (in) Prior Day 2 Days Prior 3 Days Prior Rain 4 Days Total Rain
Sort Sort Sort Sort Sort Sort Sort Sort
05/16/2017 10 Acceptable 0.0 0.0 0.1 1.7 1.8
10/13/2016 <10 Acceptable 0.1 0.0 0.0 0.0 0.1
09/14/2016 20 Acceptable 0.0 0.0 0.0 0.0 0.0
08/15/2016 <10 Acceptable 0.0 0.1 0.1 0.2 0.4
07/13/2016 <10 Acceptable 0.0 0.0 0.0 0.0 0.1
06/15/2016 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/21/2016 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/12/2015 <10 Acceptable 0.0 0.0 0.0 0.1 0.1
09/11/2015 63 Beach Advisory 0.3 1.3 0.0 0.0 1.6
08/12/2015 <10 Acceptable 0.0 1.0 0.0 0.0 1.0
07/08/2015 31 Acceptable 0.0 0.1 0.0 0.0 0.1
06/11/2015 <10 Acceptable 0.0 0.2 0.2 0.0 0.4
05/12/2015 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/13/2014 <10 Acceptable 0.0 0.0 0.4 0.0 0.4
09/08/2014 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/12/2014 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/08/2014 10 Acceptable 0.2 0.0 0.0 0.0 0.2
06/13/2014 309 Beach Advisory 1.4 0.0 0.1 0.0 1.5
05/13/2014 20 Acceptable 0.0 0.0 0.1 0.3 0.4
10/17/2013 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/19/2013 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/15/2013 41 Acceptable 0.0 0.0 0.7 0.4 1.1
07/18/2013 10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/20/2013 10 Acceptable 0.0 0.0 0.3 0.2 0.5
05/30/2013 <10 Acceptable 0.0 0.0 0.4 0.0 0.4
10/11/2012 20 Acceptable 0.0 0.1 0.0 0.0 0.1
09/11/2012 10 Acceptable 0.0 0.0 0.0 1.4 1.4
08/14/2012 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/17/2012 <10 Acceptable 0.0 0.0 0.2 0.0 0.2
06/12/2012 20 Acceptable 0.5 0.0 0.0 0.0 0.5
05/16/2012 <10 Acceptable 0.1 0.4 0.1 0.0 0.6
10/20/2011 63 Beach Advisory 0.0 0.1 0.0 0.0 0.1
09/15/2011 31 Acceptable 0.0 0.0 0.0 0.0 0.0
08/17/2011 <10 Acceptable 0.0 0.0 0.0 3.4 3.4
08/15/2011 97 Beach Advisory 0.0 3.4 0.0 0.0 3.4
07/18/2011 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/28/2011 63 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/17/2011 4611 Beach Advisory 1.2 0.0 0.8 0.0 2.0
10/13/2010 <10 Acceptable 0.0 0.1 0.2 0.0 0.3
09/12/2010 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/18/2010 <10 Acceptable 0.0 0.0 0.2 0.3 0.5
07/22/2010 441 Beach Advisory 0.0 0.1 0.0 1.4 1.5
06/16/2010 10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/22/2010 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/20/2009 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/15/2009 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/21/2009 10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/29/2009 <10 Acceptable 0.0 0.0 0.0 0.2 0.2
06/23/2009 20 Acceptable 0.0 0.0 0.6 0.5 1.1
06/08/2009 <10 Acceptable 0.0 0.0 0.0 0.8 0.8
05/13/2009 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/21/2008 41 Acceptable 0.0 0.0 0.0 0.0 0.0
09/23/2008 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/21/2008 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/15/2008 10 Acceptable 0.0 1.1 0.0 0.0 1.1
06/25/2008 1483 Beach Advisory 0.0 0.0 0.0 0.1 0.1
06/16/2008 6 Acceptable 0.0 0.0 1.7 0.0 1.7
05/20/2008 2420 Beach Advisory 0.0 0.0 0.2 0.1 0.3
09/09/2007 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/23/2007 48 Acceptable 0.0 0.0 1.3 0.1 1.4
07/16/2007 6 Acceptable 0.0 0.0 0.0 0.0 0.0
06/20/2007 11 Acceptable 0.1 0.3 0.0 0.0 0.4
05/21/2007 13 Acceptable 0.0 0.0 0.2 0.0 0.2
04/25/2007 43 Acceptable 0.0 0.0 0.0 0.0 0.0
12/06/2006 69 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/20/2006 15 Acceptable 0.4 0.1 0.0 1.1 1.6
09/19/2006 2 Acceptable 0.0 0.0 0.0 0.0 0.0

Entero Count (fecal indicator) and Rainfall Correlation

67 Samples taken

All Water Quality Parameters

67 Samples taken

Sample Date [i] Entero Count

Entero Count

Enterococcus (“Entero”) is a fecal indicating bacterium that lives in the intestines of humans and other warm-blooded animals. It is the EPA preferred indicator for sewage contamination.

Quality [i] Temp (f)

Temperature

Hudson River water temperature changes seasonally. Surface water temperature can change on small scales in the river reflecting natural and human influences.

[i] Salinity

Salinity

Estuaries like the Hudson are where freshwaters in rivers meet the sea. Salinity tells us about the relative contribution of fresh and salt water within a particular region of the estuary. 

[i] Chlorophyll

Chlorophyll

A measure of the amount of microscopic algae present in the water. High chlorophyll counts can mean high levels of the nutrients phosphorus and nitrogen, and the threat, or presence, of algae blooms.

[i] Turbidity

Turbidity

Turbidity is a measure of the amount of fine particles suspended in the water. As turbidity rises, light penetration, a key factor for aquatic plants and algae, diminishes.

[i] Oxygen

Oxygen

Oxygen concentrations in the water are closely connected to biological activities. Surface waters are typically in equilibrium with the atmosphere such that the oxygen concentration near the surface is close to fully saturated (100%).

Sort Sort Sort Sort Sort Sort Sort Sort
05/16/2017 10 Acceptable 59.0 0.2 8.8 12.2 101.1
10/13/2016 <10 Acceptable
09/14/2016 20 Acceptable 81.8 8.0 5.7 n/a 118.5
08/15/2016 <10 Acceptable 87 5.2 20.3 31.3 135.6
07/13/2016 <10 Acceptable 81 5.9 13.3 9.9 112.2
06/15/2016 <10 Acceptable 71.8 3.5 7.4 20.5 108.6
05/21/2016 10 Acceptable 60.8 2.7 14.5 23.2 100.1
10/12/2015 <10 Acceptable 68.3 7.1 6.7 9 103
09/11/2015 63 Beach Advisory 79.1 8.2 9.3 18 90
08/12/2015 <10 Acceptable 82.7 6.8 19.1 11 147
07/08/2015 31 Acceptable 81 1.5 29.4 27 129
06/11/2015 <10 Acceptable 76.4 3.3 24.3 5 145
05/12/2015 <10 Acceptable 67.5 3.9 4 31 102
10/13/2014 <10 Acceptable 64.7 7.3 0.2 12 95
09/08/2014 <10 Acceptable 78.1 5.1 19.7 7 135
08/12/2014 <10 Acceptable 78.7 5.9 6.8 22 89
07/08/2014 10 Acceptable 79.4 1.3 6 25 97
06/13/2014 309 Beach Advisory 69.3 6.1 15.4 15 95
05/13/2014 20 Acceptable 60.2 3 2.1 18 99
10/17/2013 <10 Acceptable 67.4 7.4 3 6 88
09/19/2013 10 Acceptable 71 4.9 4.5 13 94
08/15/2013 41 Acceptable 75.8 3.4 13.6 17 119
07/18/2013 10 Acceptable 85 2.9 5.6 25 88
06/20/2013 10 Acceptable 71.1 0.3 3.7 16 96
05/30/2013 <10 Acceptable 68.8 0.8 1.2 28 95
10/11/2012 20 Acceptable 62.9 4.1 6.9 44 95
09/11/2012 10 Acceptable 76 6.5 6.4 18 93
08/14/2012 <10 Acceptable 82.1 7.4 4.4 12 96
07/17/2012 <10 Acceptable 83.1 8.3 23.4 8 133
06/12/2012 20 Acceptable 72.7 1.7 6.1 27 92
05/16/2012 <10 Acceptable 66.9 0.4 5.9 16 118
10/20/2011 63 Beach Advisory 63.4 0.3 0.7 118 92
09/15/2011 31 Acceptable 71.6 0.1 2.3 90 86
08/17/2011 <10 Acceptable 82.2 4.7 6.7 17 106
08/15/2011 97 Beach Advisory n/a n/a n/a n/a n/a
07/18/2011 <10 Acceptable 83 2 8.6 16 n/a
06/28/2011 63 Beach Advisory 80.5 1.5 12.5 15 115
05/17/2011 4611 Beach Advisory 61 1.7 n/a n/a 93
10/13/2010 <10 Acceptable 65 0.2 7.2 21 91
09/12/2010 10 Acceptable 71.3 6.3 19.6 20 91
08/18/2010 <10 Acceptable 80.8 7.1 9.2 159 100
07/22/2010 441 Beach Advisory 82 7.1 41.4 32 147
06/16/2010 10 Acceptable 73.3 6.2 12.2 16 91
05/22/2010 10 Acceptable 64.6 5 7.1 9 92
10/20/2009 <10 Acceptable 59.1 4.7 2 12 91
09/15/2009 <10 Acceptable 75.7 5.2 3 34 94
08/21/2009 10 Acceptable 83.3 3.6 20.6 15 124
07/29/2009 <10 Acceptable 79.6 2 5.7 23 96
06/23/2009 20 Acceptable 72.1 0.4 1.6 15 102
06/08/2009 <10 Acceptable n/a n/a n/a n/a n/a
05/13/2009 10 Acceptable 63.9 0.9 5.1 15 111
10/21/2008 41 Acceptable 60.9 7.7 3.7 6 93
09/23/2008 <10 Acceptable 72.4 5.4 2.4 6 94
08/21/2008 <10 Acceptable 77.5 4.8 12.9 15 113
07/15/2008 10 Acceptable 80.9 4.7 5.8 21 109
06/25/2008 1483 Beach Advisory 77.3 5.7 5.4 12 105
06/16/2008 6 Acceptable n/a n/a n/a n/a n/a
05/20/2008 2420 Beach Advisory 58.2 2.6 2.4 35 96
09/09/2007 <10 Acceptable 79.3 8.3 13.2 12 116
08/23/2007 48 Acceptable 75 6.6 3.4 6 82
07/16/2007 6 Acceptable 79.3 7.2 4 27 90
06/20/2007 11 Acceptable n/a n/a n/a n/a n/a
05/21/2007 13 Acceptable 62.6 0.7 2.7 55 97
04/25/2007 43 Acceptable 53.6 0.1 1.7 365 106
12/06/2006 69 Beach Advisory 44.5 0.2 1.4 9 96
10/20/2006 15 Acceptable n/a n/a n/a n/a n/a
09/19/2006 2 Acceptable n/a n/a n/a n/a n/a

Water Quality*

Acceptable (0–60) Beach Advisory (61+)

*Single sample thresholds;
Enterococcus count per 100mL

Prior Four Day Rainfall
(in inches)

Dry Weather (0–0.25) Wet Weather (0.25+)

Enterococcus is an EPA-approved fecal contamination indicator.

Samples taken by Riverkeeper, Lamont-Doherty Earth Observatory and CUNY Queens College staff, and processed on the Riverkeeper vessel, according to the 2014 Quality Assurance Project Plan.

Rainfall data comes from wunderground.com. Wet weather is a common trigger of fecal contamination.

What do the Numbers Mean?

Water Quality scoring is based on the 2012 Recreational Water Quality Criteria from the US Environmental Protection Agency (EPA) for safe swimming. Learn More

About this location:

Ossining, NY
Swimming at Ossining beach is prohibited, yet casual contact with the water has been observed. The beach is immediately north of a sewage treatment plant outfall. There is fishing, boating and kayaking at this site.

Agencies Responsible:

Westchester County Dept. of Health: 914-813-5000 and NYSDEC Region 3: 914-428-2505

Help Save the Environmental Law That Banned Fracking
Become a Member