Stony Point mid-channel

Stony Point midchannel

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

69 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
10/17/201720Acceptable0.00.10.00.00.2
09/12/2017<10Acceptable0.00.00.00.00.0
08/15/201710Acceptable0.10.00.00.40.5
07/11/2017<10Acceptable0.40.10.00.00.5
06/13/2017<10Acceptable0.00.00.00.00.0
05/16/2017<10Acceptable0.00.00.11.71.8
04/06/201731Acceptable0.90.01.10.02.0
10/16/2016<10Acceptable0.00.00.00.10.1
09/15/2016<10Acceptable0.00.20.00.00.2
08/16/2016<10Acceptable0.00.00.10.10.2
07/14/2016<10Acceptable0.20.00.00.00.2
06/16/2016<10Acceptable0.00.00.00.00.0
05/21/2016<10Acceptable0.00.00.00.00.0
10/13/2015<10Acceptable0.00.00.00.00.0
09/12/2015<10Acceptable0.00.31.30.01.6
08/13/2015<10Acceptable0.00.01.00.01.0
07/09/2015<10Acceptable0.30.30.10.00.7
06/12/2015<10Acceptable0.00.00.00.20.2
05/13/2015<10Acceptable0.00.00.00.00.0
10/14/201420Acceptable0.00.00.00.40.4
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
06/13/201430Acceptable1.40.00.10.01.5
05/13/2014<10Acceptable0.00.00.10.30.4
10/17/2013<10Acceptable0.00.00.00.00.0
09/19/2013<10Acceptable0.00.00.00.00.0
08/15/201330Acceptable0.00.00.70.41.1
07/18/2013<10Acceptable0.00.00.00.00.0
06/20/2013<10Acceptable0.00.00.30.20.5
05/30/2013<10Acceptable0.00.00.40.00.4
10/11/201210Acceptable0.00.10.00.00.1
09/11/2012<10Acceptable0.00.00.01.41.4
08/14/2012<10Acceptable0.00.00.00.00.0
07/17/2012<10Acceptable0.00.00.20.00.2
06/12/201210Acceptable0.50.00.00.00.5
05/16/201220Acceptable0.10.40.10.00.6
10/20/201110Acceptable0.00.10.00.00.1
09/15/201186Beach Advisory0.00.00.00.00.0
08/17/201110Acceptable0.00.00.03.43.4
07/18/2011<10Acceptable0.00.00.00.00.0
06/28/201120Acceptable0.00.00.00.00.0
05/17/201131Acceptable1.20.00.80.02.0
10/13/2010<10Acceptable0.00.10.30.00.4
09/12/2010<10Acceptable0.00.00.00.00.0
08/18/2010<10Acceptable0.00.00.20.30.5
07/22/201010Acceptable0.00.10.01.41.5
06/16/2010<10Acceptable0.00.00.00.00.0
05/22/2010<10Acceptable0.00.00.00.00.0
10/20/200931Acceptable0.00.00.00.00.0
09/15/2009<10Acceptable0.00.00.00.00.0
08/21/200910Acceptable0.00.00.00.00.0
07/29/2009<10Acceptable0.60.00.00.20.8
06/23/200910Acceptable0.00.00.60.51.1
06/08/2009<10Acceptable0.00.00.00.80.8
05/17/20099Acceptable0.20.00.00.30.5
05/13/20092Acceptable0.00.00.00.00.0
10/21/2008<10Acceptable0.00.00.00.00.0
09/23/2008<10Acceptable0.00.00.00.00.0
08/21/2008<10Acceptable0.00.00.00.00.0
07/15/20089Acceptable0.01.10.00.01.1
06/25/200822Acceptable0.00.00.00.10.1
06/16/20087Acceptable0.00.01.70.01.7
05/20/200818Acceptable0.30.00.20.10.6
09/09/20071Acceptable0.00.00.00.00.0
08/23/20077Acceptable0.00.01.30.11.4
07/16/20071Acceptable0.00.00.00.00.0
04/25/2007196Beach Advisory0.00.00.00.00.0
09/19/20063Acceptable0.00.00.00.00.0

Entero Count (fecal indicator) and Rainfall Correlation

69 Samples taken

All Water Quality Parameters

69 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
10/17/201720Acceptable70.96.42.111.788.2
09/12/2017<10Acceptable76.252.312.386.3
08/15/201710Acceptable81.12.64.415.982.9
07/11/2017<10Acceptable79.71.63.011.091.2
06/13/2017<10Acceptable71.70.13.211.2119.2
05/16/2017<10Acceptable59.00.12.723.994.0
04/06/201731Acceptable41.80.11.825.699.0
10/16/2016<10Acceptable65.58.35.43691
09/15/2016<10Acceptable78.57.96.3n/a96
08/16/2016<10Acceptable85.44.25.22990
07/14/2016<10Acceptable78.83.35.11087
06/16/2016<10Acceptable713.55.82196
05/21/2016<10Acceptable601.23.73897
10/13/2015<10Acceptable69.55.64.51093
09/12/2015<10Acceptable81.95.94.11483
08/13/2015<10Acceptable82.156.61091
07/09/2015<10Acceptable76.90.22.93284
06/12/2015<10Acceptable7114.42792
05/13/2015<10Acceptable61.81.92.637n/a
10/14/201420Acceptable70.24.41.81889
09/08/2014<10Acceptable80.23.710.118102
08/12/2014<10Acceptable80.14.24.23085
07/08/201410Acceptable80.712.71989
06/13/201430Acceptable71.84.442388
05/13/2014<10Acceptable58.42.31.92198
10/17/2013<10Acceptable69.762.3889
09/19/2013<10Acceptable75.73.33.91498
08/15/201330Acceptable79.21.22.95283
07/18/2013<10Acceptable82.12.12.54074
06/20/2013<10Acceptable67.60.12.73295
05/30/2013<10Acceptable66.70.13.32596
10/11/201210Acceptable68.83.731584
09/11/2012<10Acceptable80.44.74.12386
08/14/2012<10Acceptable83.16.62.4684
07/17/2012<10Acceptable83.77.613.96107
06/12/201210Acceptable73.10.32.32588
05/16/201220Acceptable62.90.13.95297
10/20/201110Acceptable64.30.11.56788
09/15/201186Beach Advisory68.50.11.720986
08/17/201110Acceptable83.42.62.52588
07/18/2011<10Acceptable83.50.92.31994
06/28/201120Acceptable77.70.73.7n/a85
05/17/201131Acceptable59.20.12.816792
10/13/2010<10Acceptable670.14.42688
09/12/2010<10Acceptable73.94.86.62186
08/18/2010<10Acceptable82.93.95.8583
07/22/201010Acceptable84.74.82.91288
06/16/2010<10Acceptable73.43.94.12484
05/22/2010<10Acceptable64.722.42892
10/20/200931Acceptable60.83.731889
09/15/2009<10Acceptable76.84.11.92781
08/21/200910Acceptable83.32.24.71686
07/29/2009<10Acceptable80.30.53.71885
06/23/200910Acceptable710.11.12989
06/08/2009<10Acceptablen/an/an/an/an/a
05/17/20099Acceptablen/an/an/an/an/a
05/13/20092Acceptable61.60.23.923107
10/21/2008<10Acceptable65.64.71.4887
09/23/2008<10Acceptable76.12.51.61185
08/21/2008<10Acceptable81.52.42.7885
07/15/20089Acceptable84.73.52.71892
06/25/200822Acceptable76.73.31.71687
06/16/20087Acceptablen/an/an/an/an/a
05/20/200818Acceptable59.81.61.53492
09/09/20071Acceptablen/an/an/an/an/a
08/23/20077Acceptable80.25.71.6780
07/16/20071Acceptable90.65.9051105
04/25/2007196Beach Advisory48.90.10.3559108
09/19/20063Acceptablen/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:

Stony Point, NY
This deep water sampling site has boating, kayaking and fishing.

Agencies Responsible:

Rockland County Dept. of Health: 845-364-2900, Westchester County Dept. of Health: 914-813-5000 and NYSDEC Region 3: 914-428-2505

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