Water Quality
Water Quality > Hudson River Estuary Data > Rockland County & Westchester County Sites > Stony Point mid-channel

Stony Point mid-channel

Stony Point midchannel
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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

105 Samples taken

Sample Date [i] Enterococcus Count
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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
10/17/2023 10 Acceptable 0.0 0.0 0.0 0.6 0.6
09/19/2023 52 Acceptable 0.0 1.0 0.2 0.1 1.3
08/22/2023 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/18/2023 20 Acceptable 0.0 0.0 1.4 0.2 1.6
06/27/2023 31 Acceptable 1.3 1.6 0.0 0.3 3.1
05/02/2023 84 Beach Advisory 0.0 0.2 2.2 1.6 4.0
10/11/2022 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/11/2022 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/20/2022 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/16/2022 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/14/2022 <10 Acceptable 0.1 0.0 0.0 0.0 0.1
05/24/2022 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/29/2021 529 Beach Advisory 0.0 0.0 0.0 3.4 3.4
09/14/2021 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/17/2021 <10 Acceptable 0.0 0.0 0.0 0.1 0.1
07/20/2021 <10 Acceptable 0.0 0.1 0.3 0.9 1.3
06/08/2021 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/18/2021 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/15/2020 <10 Acceptable 0.0 0.0 0.3 0.3 0.6
09/19/2020 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/15/2020 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/15/2020 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/17/2020 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/27/2020 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/09/2019 <10 Acceptable 0.1 0.1 0.2 0.0 0.4
09/11/2019 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/07/2019 10 Acceptable 0.0 0.0 0.0 0.2 0.2
07/10/2019 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/06/2019 <10 Acceptable 0.1 0.0 0.0 0.0 0.1
05/09/2019 10 Acceptable 0.0 0.0 0.0 0.1 0.1
10/11/2018 10 Acceptable 0.0 0.0 0.0 0.1 0.1
09/11/2018 63 Beach Advisory 0.0 1.7 0.1 0.1 1.9
08/15/2018 <10 Acceptable 0.0 0.0 0.8 0.2 1.0
07/18/2018 <10 Acceptable 0.0 1.6 0.1 0.3 2.0
06/14/2018 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/07/2018 10 Acceptable 0.0 0.2 0.0 0.0 0.2
10/17/2017 20 Acceptable 0.0 0.1 0.0 0.0 0.1
09/12/2017 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/15/2017 10 Acceptable 0.1 0.0 0.0 0.4 0.5
07/11/2017 <10 Acceptable 0.4 0.1 0.0 0.0 0.5
06/13/2017 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/16/2017 <10 Acceptable 0.0 0.0 0.1 1.7 1.8
04/06/2017 31 Acceptable 0.9 0.0 1.1 0.0 2.0
10/16/2016 <10 Acceptable 0.0 0.0 0.0 0.1 0.1
09/15/2016 <10 Acceptable 0.0 0.2 0.0 0.0 0.2
08/16/2016 <10 Acceptable 0.0 0.0 0.1 0.1 0.2
07/14/2016 <10 Acceptable 0.2 0.0 0.0 0.0 0.2
06/16/2016 <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
10/13/2015 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/12/2015 <10 Acceptable 0.0 0.3 1.3 0.0 1.6
08/13/2015 <10 Acceptable 0.0 0.0 1.0 0.0 1.0
07/09/2015 <10 Acceptable 0.3 0.3 0.1 0.0 0.7
06/12/2015 <10 Acceptable 0.0 0.0 0.0 0.2 0.2
05/13/2015 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/14/2014 20 Acceptable 0.0 0.0 0.0 0.4 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 30 Acceptable 1.4 0.0 0.1 0.0 1.5
05/13/2014 <10 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 30 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 10 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 10 Acceptable 0.5 0.0 0.0 0.0 0.5
05/16/2012 20 Acceptable 0.1 0.4 0.1 0.0 0.6
10/20/2011 10 Acceptable 0.0 0.1 0.0 0.0 0.1
09/15/2011 86 Beach Advisory 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
07/18/2011 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/28/2011 20 Acceptable 0.0 0.0 0.0 0.0 0.0
05/17/2011 31 Acceptable 1.2 0.0 0.8 0.0 2.0
10/13/2010 <10 Acceptable 0.0 0.1 0.3 0.0 0.4
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 10 Acceptable 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 31 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 0.6 0.0 0.0 0.2 0.8
06/23/2009 10 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
05/17/2009 9 Acceptable 0.2 0.0 0.0 0.3 0.5
05/13/2009 2 Acceptable 0.0 0.0 0.0 0.0 0.0
10/21/2008 <10 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 9 Acceptable 0.0 1.1 0.0 0.0 1.1
06/25/2008 22 Acceptable 0.0 0.0 0.0 0.1 0.1
06/16/2008 7 Acceptable 0.0 0.0 1.7 0.0 1.7
05/20/2008 18 Acceptable 0.3 0.0 0.2 0.1 0.6
09/09/2007 1 Acceptable 0.0 0.0 0.0 0.0 0.0
08/23/2007 7 Acceptable 0.0 0.0 1.3 0.1 1.4
07/16/2007 1 Acceptable 0.0 0.0 0.0 0.0 0.0
04/25/2007 196 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/19/2006 3 Acceptable 0.0 0.0 0.0 0.0 0.0

Entero Count (fecal indicator) and Rainfall Correlation

105 Samples taken

All Water Quality Parameters

105 Samples taken

Sample Date [i] Entero Count
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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)
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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
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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
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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
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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
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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
10/17/2023 10 Acceptable 17.01 0.87 1.46 12 102.1
09/19/2023 52 Acceptable 23.32 2.61 2.03 n/a n/a
08/22/2023 <10 Acceptable 24.78 0.68 2.68 2.7 81.5
07/18/2023 20 Acceptable 26.8 0.13 3.42 15 86.8
06/27/2023 31 Acceptable 70.9 5.6 4.5 8.1 84.5
05/02/2023 84 Beach Advisory 55.3 1.8 2.2 11.8 92.3
10/11/2022 <10 Acceptable 64.7 6.3 1.7 5.1 85.9
09/11/2022 <10 Acceptable 77.2 6.6 10.7 9.6 79.2
08/20/2022 <10 Acceptable 79.9 5.5 5.1 6.9 85.9
07/16/2022 <10 Acceptable 77.9 5.1 4.8 11.3 87.1
06/14/2022 <10 Acceptable 70.4 3 3.3 16.3 n/a
05/24/2022 10 Acceptable 62.1 2.6 1.7 17.1 96.1
10/29/2021 529 Beach Advisory 60.4 0.2 3.0 11 88
09/14/2021 <10 Acceptable 74.4 0.2 4.6 19 84
08/17/2021 <10 Acceptable 78.2 3.0 4.0 11 79
07/20/2021 <10 Acceptable 78.7 0.1 4.0 20 81
06/08/2021 <10 Acceptable 69.4 2.0 3.1 11 94
05/18/2021 <10 Acceptable 59.6 0.5 2.6 14 92
10/15/2020 <10 Acceptable 66.4 8.4 3.1 9 88
09/19/2020 <10 Acceptable 72.4 8.5 4.0 14 88
08/15/2020 <10 Acceptable 83.3 4.8 6.2 9 80
07/15/2020 <10 Acceptable 81.6 4.6 5.3 7 89
06/17/2020 <10 Acceptable 73.0 5.4 7.2 7 105
05/27/2020 <10 Acceptable 62.5 2.1 1.8 22 98
10/09/2019 <10 Acceptable 68.9 4.9 n/a 4 87
09/11/2019 <10 Acceptable 78.5 5.3 4.3 7 90
08/07/2019 10 Acceptable 85.3 4.2 4.5 17 78
07/10/2019 <10 Acceptable 80.8 2.1 5.1 15 89
06/06/2019 <10 Acceptable 68.4 0.7 2.1 15 93
05/09/2019 10 Acceptable 56.3 0.1 2.1 20 98
10/11/2018 10 Acceptable 71.3 0.1 3.2 17 88
09/11/2018 63 Beach Advisory 78.4 2.9 3.9 8 77
08/15/2018 <10 Acceptable 83.5 0.2 2.7 15 82
07/18/2018 <10 Acceptable 82.9 4.8 7.3 16 88
06/14/2018 <10 Acceptable 72.5 4.5 9.6 21 103
05/07/2018 10 Acceptable 56.7 0.1 1.8 20 105
10/17/2017 20 Acceptable 70.9 6.4 2.1 12 88
09/12/2017 <10 Acceptable 76.2 5.0 2.3 12 86
08/15/2017 10 Acceptable 81.1 2.6 4.4 16 83
07/11/2017 <10 Acceptable 79.7 1.6 3.0 11 91
06/13/2017 <10 Acceptable 71.7 0.1 3.2 11 119
05/16/2017 <10 Acceptable 59.0 0.1 2.7 24 94
04/06/2017 31 Acceptable 41.8 0.1 1.8 26 99
10/16/2016 <10 Acceptable 65.5 8.3 5.4 36 91
09/15/2016 <10 Acceptable 78.5 7.9 6.3 n/a 96
08/16/2016 <10 Acceptable 85.4 4.2 5.2 29 90
07/14/2016 <10 Acceptable 78.8 3.3 5.1 10 87
06/16/2016 <10 Acceptable 71.0 3.5 5.8 21 96
05/21/2016 <10 Acceptable 60.0 1.2 3.7 38 97
10/13/2015 <10 Acceptable 69.5 5.6 4.5 10 93
09/12/2015 <10 Acceptable 81.9 5.9 4.1 14 83
08/13/2015 <10 Acceptable 82.1 5.0 6.6 10 91
07/09/2015 <10 Acceptable 76.9 0.2 2.9 32 84
06/12/2015 <10 Acceptable 71.0 1.0 4.4 27 92
05/13/2015 <10 Acceptable 61.8 1.9 2.6 37 n/a
10/14/2014 20 Acceptable 70.2 4.4 1.8 18 89
09/08/2014 <10 Acceptable 80.2 3.7 10.1 18 102
08/12/2014 <10 Acceptable 80.1 4.2 4.2 30 85
07/08/2014 10 Acceptable 80.7 1.0 2.7 19 89
06/13/2014 30 Acceptable 71.8 4.4 4.0 23 88
05/13/2014 <10 Acceptable 58.4 2.3 1.9 21 98
10/17/2013 <10 Acceptable 69.7 6.0 2.3 8 89
09/19/2013 <10 Acceptable 75.7 3.3 3.9 14 98
08/15/2013 30 Acceptable 79.2 1.2 2.9 52 83
07/18/2013 <10 Acceptable 82.1 2.1 2.5 40 74
06/20/2013 <10 Acceptable 67.6 0.1 2.7 32 95
05/30/2013 <10 Acceptable 66.7 0.1 3.3 25 96
10/11/2012 10 Acceptable 68.8 3.7 3.0 15 84
09/11/2012 <10 Acceptable 80.4 4.7 4.1 23 86
08/14/2012 <10 Acceptable 83.1 6.6 2.4 6 84
07/17/2012 <10 Acceptable 83.7 7.6 13.9 6 107
06/12/2012 10 Acceptable 73.1 0.3 2.3 25 88
05/16/2012 20 Acceptable 62.9 0.1 3.9 52 97
10/20/2011 10 Acceptable 64.3 0.1 1.5 67 88
09/15/2011 86 Beach Advisory 68.5 0.1 1.7 209 86
08/17/2011 10 Acceptable 83.4 2.6 2.5 25 88
07/18/2011 <10 Acceptable 83.5 0.9 2.3 19 94
06/28/2011 20 Acceptable 77.7 0.7 3.7 n/a 85
05/17/2011 31 Acceptable 59.2 0.1 2.8 167 92
10/13/2010 <10 Acceptable 67.0 0.1 4.4 26 88
09/12/2010 <10 Acceptable 73.9 4.8 6.6 21 86
08/18/2010 <10 Acceptable 82.9 3.9 5.8 5 83
07/22/2010 10 Acceptable 84.7 4.8 2.9 12 88
06/16/2010 <10 Acceptable 73.4 3.9 4.1 24 84
05/22/2010 <10 Acceptable 64.7 2.0 2.4 28 92
10/20/2009 31 Acceptable 60.8 3.7 3.0 18 89
09/15/2009 <10 Acceptable 76.8 4.1 1.9 27 81
08/21/2009 10 Acceptable 83.3 2.2 4.7 16 86
07/29/2009 <10 Acceptable 80.3 0.5 3.7 18 85
06/23/2009 10 Acceptable 71.0 0.1 1.1 29 89
06/08/2009 <10 Acceptable n/a n/a n/a n/a n/a
05/17/2009 9 Acceptable n/a n/a n/a n/a n/a
05/13/2009 2 Acceptable 61.6 0.2 3.9 23 107
10/21/2008 <10 Acceptable 65.6 4.7 1.4 8 87
09/23/2008 <10 Acceptable 76.1 2.5 1.6 11 85
08/21/2008 <10 Acceptable 81.5 2.4 2.7 8 85
07/15/2008 9 Acceptable 84.7 3.5 2.7 18 92
06/25/2008 22 Acceptable 76.7 3.3 1.7 16 87
06/16/2008 7 Acceptable n/a n/a n/a n/a n/a
05/20/2008 18 Acceptable 59.8 1.6 1.5 34 92
09/09/2007 1 Acceptable n/a n/a n/a n/a n/a
08/23/2007 7 Acceptable 80.2 5.7 1.6 7 80
07/16/2007 1 Acceptable 90.6 5.9 0.0 51 105
04/25/2007 196 Beach Advisory 48.9 0.1 0.3 559 108
09/19/2006 3 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:

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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