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

71 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.

QualityRain, day of (in)Prior Day2 Days Prior3 Days Prior Rain4 Days Total Rain
SortSortSortSortSortSortSortSort
09/11/2017<10Acceptable0.00.00.00.00.0
08/14/2017<10Acceptable0.00.00.40.30.8
07/10/201710Acceptable0.00.00.02.22.2
06/12/201731Acceptable0.00.00.00.00.0
05/16/201710Acceptable0.00.00.11.71.8
10/13/2016<10Acceptable0.10.00.00.00.1
09/14/201620Acceptable0.00.00.00.00.0
08/15/2016<10Acceptable0.00.10.10.20.4
07/13/2016<10Acceptable0.00.00.00.00.0
06/15/2016<10Acceptable0.00.00.00.00.0
05/21/201610Acceptable0.00.00.00.00.0
10/12/2015<10Acceptable0.00.00.00.10.1
09/11/201563Beach Advisory0.31.30.00.01.6
08/12/2015<10Acceptable0.01.00.00.01.0
07/08/201531Acceptable0.00.10.00.00.1
06/11/2015<10Acceptable0.00.00.20.20.4
05/12/2015<10Acceptable0.00.00.00.00.0
10/13/2014<10Acceptable0.00.00.40.00.4
09/08/2014<10Acceptable0.00.00.00.00.0
08/12/2014<10Acceptable0.00.00.00.00.0
07/08/201410Acceptable0.20.00.00.00.2
06/13/2014309Beach Advisory1.40.00.10.01.5
05/13/201420Acceptable0.00.00.10.30.4
10/17/2013<10Acceptable0.00.00.00.00.0
09/19/201310Acceptable0.00.00.00.00.0
08/15/201341Acceptable0.00.00.70.41.1
07/18/201310Acceptable0.00.00.00.00.0
06/20/201310Acceptable0.00.00.30.20.5
05/30/2013<10Acceptable0.00.00.40.00.4
10/11/201220Acceptable0.00.10.00.00.1
09/11/201210Acceptable0.00.00.01.41.4
08/14/2012<10Acceptable0.00.00.00.00.0
07/17/2012<10Acceptable0.00.00.20.00.2
06/12/201220Acceptable0.50.00.00.00.5
05/16/2012<10Acceptable0.10.40.10.00.6
10/20/201163Beach Advisory0.00.10.00.00.1
09/15/201131Acceptable0.00.00.00.00.0
08/17/2011<10Acceptable0.00.00.03.43.4
08/15/201197Beach Advisory0.03.40.00.03.4
07/18/2011<10Acceptable0.00.00.00.00.0
06/28/201163Beach Advisory0.00.00.00.00.0
05/17/20114611Beach Advisory1.20.00.80.02.0
10/13/2010<10Acceptable0.00.10.30.00.4
09/12/201010Acceptable0.00.00.00.00.0
08/18/2010<10Acceptable0.00.00.20.30.5
07/22/2010441Beach Advisory0.00.10.01.41.5
06/16/201010Acceptable0.00.00.00.00.0
05/22/201010Acceptable0.00.00.00.00.0
10/20/2009<10Acceptable0.00.00.00.00.0
09/15/2009<10Acceptable0.00.00.00.00.0
08/21/200910Acceptable0.00.00.00.00.0
07/29/2009<10Acceptable0.00.00.00.20.2
06/23/200920Acceptable0.00.00.60.51.1
06/08/2009<10Acceptable0.00.00.00.80.8
05/13/200910Acceptable0.00.00.00.00.0
10/21/200841Acceptable0.00.00.00.00.0
09/23/2008<10Acceptable0.00.00.00.00.0
08/21/2008<10Acceptable0.00.00.00.00.0
07/15/200810Acceptable0.01.10.00.01.1
06/25/20081483Beach Advisory0.00.00.00.10.1
06/16/20086Acceptable0.00.01.70.01.7
05/20/20082420Beach Advisory0.00.00.20.10.3
09/09/2007<10Acceptable0.00.00.00.00.0
08/23/200748Acceptable0.00.01.30.11.4
07/16/20076Acceptable0.00.00.00.00.0
06/20/200711Acceptable0.10.30.00.00.4
05/21/200713Acceptable0.00.00.20.00.2
04/25/200743Acceptable0.00.00.00.00.0
12/06/200669Beach Advisory0.00.00.00.00.0
10/20/200615Acceptable0.40.10.01.11.6
09/19/20062Acceptable0.00.00.00.00.0

Entero Count (fecal indicator) and Rainfall Correlation

71 Samples taken

All Water Quality Parameters

71 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%).

SortSortSortSortSortSortSortSort
09/11/2017<10Acceptable71.97.188.4103.8
08/14/2017<10Acceptable814.613.29.4108.1
07/10/201710Acceptable79.62.74.58.7110.6
06/12/201731Acceptable77.70.89.610.8131.5
05/16/201710Acceptable59.00.28.812.2101.1
10/13/2016<10Acceptable66.19.57.23496
09/14/201620Acceptable81.885.7n/a119
08/15/2016<10Acceptable875.220.331136
07/13/2016<10Acceptable815.913.310112
06/15/2016<10Acceptable71.83.57.421109
05/21/201610Acceptable60.82.714.523100
10/12/2015<10Acceptable68.37.16.79103
09/11/201563Beach Advisory79.18.29.31890
08/12/2015<10Acceptable82.76.819.111147
07/08/201531Acceptable811.529.427129
06/11/2015<10Acceptable76.43.324.35145
05/12/2015<10Acceptable67.53.9431102
10/13/2014<10Acceptable64.77.30.21295
09/08/2014<10Acceptable78.15.119.77135
08/12/2014<10Acceptable78.75.96.82289
07/08/201410Acceptable79.41.362597
06/13/2014309Beach Advisory69.36.115.41595
05/13/201420Acceptable60.232.11899
10/17/2013<10Acceptable67.47.43688
09/19/201310Acceptable714.94.51394
08/15/201341Acceptable75.83.413.617119
07/18/201310Acceptable852.95.62588
06/20/201310Acceptable71.10.33.71696
05/30/2013<10Acceptable68.80.81.22895
10/11/201220Acceptable62.94.16.94495
09/11/201210Acceptable766.56.41893
08/14/2012<10Acceptable82.17.44.41296
07/17/2012<10Acceptable83.18.323.48133
06/12/201220Acceptable72.71.76.12792
05/16/2012<10Acceptable66.90.45.916118
10/20/201163Beach Advisory63.40.30.711892
09/15/201131Acceptable71.60.12.39086
08/17/2011<10Acceptable82.24.76.717106
08/15/201197Beach Advisoryn/an/an/an/an/a
07/18/2011<10Acceptable8328.616n/a
06/28/201163Beach Advisory80.51.512.515115
05/17/20114611Beach Advisory611.7n/an/a93
10/13/2010<10Acceptable650.27.22191
09/12/201010Acceptable71.36.319.62091
08/18/2010<10Acceptable80.87.19.2159100
07/22/2010441Beach Advisory827.141.432147
06/16/201010Acceptable73.36.212.21691
05/22/201010Acceptable64.657.1992
10/20/2009<10Acceptable59.14.721291
09/15/2009<10Acceptable75.75.233494
08/21/200910Acceptable83.33.620.615124
07/29/2009<10Acceptable79.625.72396
06/23/200920Acceptable72.10.41.615102
06/08/2009<10Acceptablen/an/an/an/an/a
05/13/200910Acceptable63.90.95.115111
10/21/200841Acceptable60.97.73.7693
09/23/2008<10Acceptable72.45.42.4694
08/21/2008<10Acceptable77.54.812.915113
07/15/200810Acceptable80.94.75.821109
06/25/20081483Beach Advisory77.35.75.412105
06/16/20086Acceptablen/an/an/an/an/a
05/20/20082420Beach Advisory58.22.62.43596
09/09/2007<10Acceptable79.38.313.212116
08/23/200748Acceptable756.63.4682
07/16/20076Acceptable79.37.242790
06/20/200711Acceptablen/an/an/an/an/a
05/21/200713Acceptable62.60.72.75597
04/25/200743Acceptable53.60.11.7365106
12/06/200669Beach Advisory44.50.21.4996
10/20/200615Acceptablen/an/an/an/an/a
09/19/20062Acceptablen/an/an/an/an/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

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