Water Quality
Water Quality > Hudson River Estuary Data > Rockland County & Westchester County Sites > Tarrytown Marina

Tarrytown Marina

Tarrytown Marina copy
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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

87 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
08/22/2023 309 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/18/2023 52 Acceptable 0.0 0.0 1.4 0.2 1.6
06/27/2023 17329 Beach Advisory 1.3 1.6 0.0 0.3 3.1
05/02/2023 134 Beach Advisory 0.0 0.2 2.2 1.6 4.0
10/10/2022 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/10/2022 414 Beach Advisory 0.0 0.0 0.0 2.1 2.1
08/12/2022 189 Beach Advisory 0.0 0.0 0.1 0.0 0.1
07/15/2022 10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/14/2022 97 Beach Advisory 0.1 0.0 0.0 0.0 0.1
05/24/2022 337 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/29/2021 480 Beach Advisory 0.0 0.0 0.0 3.4 3.4
09/14/2021 1607 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/17/2021 97 Beach Advisory 0.0 0.0 0.0 0.1 0.1
07/20/2021 31 Acceptable 0.0 0.1 0.3 0.9 1.3
06/08/2021 61 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/17/2021 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/14/2020 383 Beach Advisory 0.0 0.3 0.3 0.0 0.6
09/18/2020 30 Acceptable 0.0 0.0 0.0 0.0 0.0
08/14/2020 10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/14/2020 <10 Acceptable 0.0 0.0 0.0 2.2 2.2
06/16/2020 52 Acceptable 0.0 0.0 0.0 0.0 0.0
05/26/2020 10 Acceptable 0.0 0.0 0.0 0.2 0.2
10/08/2019 435 Beach Advisory 0.1 0.2 0.0 0.0 0.3
09/10/2019 520 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/06/2019 <10 Acceptable 0.0 0.0 0.2 0.9 1.1
07/09/2019 10 Acceptable 0.0 0.0 0.0 0.6 0.6
06/04/2019 10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/07/2019 10 Acceptable 0.0 0.1 1.1 0.1 1.3
10/10/2018 10 Acceptable 0.0 0.0 0.1 0.0 0.1
09/10/2018 24196 Beach Advisory 1.7 0.1 0.1 0.0 1.9
08/14/2018 <10 Acceptable 0.0 0.8 0.2 1.9 2.9
07/17/2018 >24196 Beach Advisory 1.6 0.1 0.3 0.5 2.5
06/13/2018 10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/06/2018 10 Acceptable 0.2 0.0 0.0 0.3 0.5
10/16/2017 2789 Beach Advisory 0.1 0.0 0.0 0.0 0.1
09/11/2017 20 Acceptable 0.0 0.0 0.0 0.0 0.0
08/14/2017 10 Acceptable 0.0 0.0 0.4 0.3 0.7
07/10/2017 86 Beach Advisory 0.0 0.0 0.0 2.2 2.2
06/12/2017 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/15/2017 10 Acceptable 0.0 0.1 1.7 0.0 1.8
10/13/2016 556 Beach Advisory 0.1 0.0 0.0 0.0 0.1
09/14/2016 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/15/2016 31 Acceptable 0.0 0.1 0.1 0.2 0.4
07/13/2016 10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/15/2016 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/20/2016 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/12/2015 4884 Beach Advisory 0.0 0.0 0.0 0.1 0.1
09/11/2015 10 Acceptable 0.3 1.3 0.1 0.0 1.7
08/12/2015 110 Beach Advisory 0.0 1.0 0.0 0.0 1.0
07/08/2015 <10 Acceptable 0.0 0.1 0.0 0.0 0.1
06/11/2015 <10 Acceptable 0.0 0.0 0.2 0.2 0.4
05/12/2015 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/13/2014 20 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 31 Acceptable 0.0 0.0 0.0 0.0 0.0
07/08/2014 75 Beach Advisory 0.2 0.0 0.0 0.0 0.2
06/13/2014 110 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 20 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 73 Beach Advisory 0.0 0.0 0.7 0.4 1.1
07/18/2013 85 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/20/2013 41 Acceptable 0.0 0.0 0.3 0.2 0.5
05/30/2013 20 Acceptable 0.0 0.0 0.4 0.0 0.4
10/11/2012 389 Beach Advisory 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
08/13/2012 10 Acceptable 0.0 0.0 0.0 0.2 0.2
07/17/2012 10 Acceptable 0.0 0.0 0.2 0.0 0.2
06/12/2012 75 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/16/2012 31 Acceptable 0.1 0.4 0.1 0.0 0.6
10/20/2011 86 Beach Advisory 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
08/15/2011 158 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 41 Acceptable 0.0 0.0 0.0 0.0 0.0
05/17/2011 >24196 Beach Advisory 1.2 0.0 0.8 0.0 2.0
10/13/2010 >24196 Beach Advisory 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 3654 Beach Advisory 0.0 0.1 0.0 1.4 1.5
08/22/2009 2310 Beach Advisory 0.6 0.6 0.0 0.0 1.2
09/27/2008 74 Beach Advisory 0.0 1.6 0.1 0.0 1.7
09/09/2008 213 Beach Advisory 0.6 0.0 0.0 4.8 5.4
08/21/2008 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/06/2008 3873 Beach Advisory 1.6 0.0 0.0 0.0 1.6

Entero Count (fecal indicator) and Rainfall Correlation

87 Samples taken

All Water Quality Parameters

87 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
08/22/2023 309 Beach Advisory 23.86 4.24 3.97 6.8 77.5
07/18/2023 52 Acceptable 26.33 0.53 3.74 25.7 80.2
06/27/2023 17329 Beach Advisory 72.0 7.8 12.7 8.1 95.1
05/02/2023 134 Beach Advisory 54.5 2.0 2.3 19.3 92.5
10/10/2022 <10 Acceptable 63.5 10.4 1.9 8.9 90
09/10/2022 414 Beach Advisory 79.7 10.8 8.6 9.7 109.7
08/12/2022 189 Beach Advisory 81.9 11.3 7.9 7 111.3
07/15/2022 10 Acceptable 79.6 10.3 9.6 9.3 105.3
06/14/2022 97 Beach Advisory 70.3 7.9 13 n/a 92.9
05/24/2022 337 Beach Advisory 62.7 6.6 2.1 9.8 n/a
10/29/2021 480 Beach Advisory 59.5 1.3 2.6 6 87
09/14/2021 1607 Beach Advisory 72.2 1.7 3.1 15 75
08/17/2021 97 Beach Advisory 77.5 6.6 3.5 6 78
07/20/2021 31 Acceptable 79.3 0.6 13.7 16 97
06/08/2021 61 Beach Advisory 69.9 5.9 8.2 9 95
05/17/2021 <10 Acceptable 71.3 2.5 3.2 11 113
10/14/2020 383 Beach Advisory 65.5 10.5 1.5 9 94
09/18/2020 30 Acceptable 72.3 11.4 2.6 15 83
08/14/2020 10 Acceptable 84.0 6.5 38.4 9 150
07/14/2020 <10 Acceptable 82.7 8.5 11.9 7 120
06/16/2020 52 Acceptable 73.7 6.1 11.6 9 140
05/26/2020 10 Acceptable 66.9 5.3 9.3 9 125
10/08/2019 435 Beach Advisory 67.7 8.3 3.0 5 90
09/10/2019 520 Beach Advisory 75.5 7.9 6.5 4 93
08/06/2019 <10 Acceptable 81.9 8.9 17.3 10 94
07/09/2019 10 Acceptable 81.0 6.2 5.4 12 93
06/04/2019 10 Acceptable 67.7 4.5 2.6 13 96
05/07/2019 10 Acceptable 59.9 1.0 2.2 31 98
10/10/2018 10 Acceptable 71.8 0.5 5.8 20 91
09/10/2018 24196 Beach Advisory 75.3 9.9 2.6 11 63
08/14/2018 <10 Acceptable 83.7 3.0 8.7 16 102
07/17/2018 >24196 Beach Advisory 81.6 9.8 30.7 14 115
06/13/2018 10 Acceptable 69.9 7.9 59.2 20 139
05/06/2018 10 Acceptable 57.0 0.3 3.8 28 103
10/16/2017 2789 Beach Advisory 68.7 10.1 4.2 20 94
09/11/2017 20 Acceptable 71.1 8.5 3.9 19 93
08/14/2017 10 Acceptable 79.3 7.0 4.8 12 86
07/10/2017 86 Beach Advisory 79.5 3.9 5.7 9 115
06/12/2017 <10 Acceptable 74.5 1.5 4.2 19 106
05/15/2017 10 Acceptable 58.8 0.2 7.9 63 103
10/13/2016 556 Beach Advisory 65.9 11.5 3.4 38 91
09/14/2016 <10 Acceptable 78.6 10.0 0.8 n/a 118
08/15/2016 31 Acceptable 87.8 6.5 18.0 31 162
07/13/2016 10 Acceptable 82.2 7.2 11.3 10 117
06/15/2016 <10 Acceptable 73.3 4.8 5.2 20 111
05/20/2016 10 Acceptable 64.3 4.3 6.0 n/a 112
10/12/2015 4884 Beach Advisory 67.2 8.4 4.4 27 97
09/11/2015 10 Acceptable 78.3 10.2 5.6 19 85
08/12/2015 110 Beach Advisory 79.3 8.9 17.6 46 113
07/08/2015 <10 Acceptable 79.8 2.4 15.9 34 118
06/11/2015 <10 Acceptable 73.6 4.7 10.3 4 111
05/12/2015 10 Acceptable 68.1 5.8 2.0 24 98
10/13/2014 20 Acceptable 64.6 9.2 0.2 20 88
09/08/2014 <10 Acceptable 76.8 7.5 26.4 9 105
08/12/2014 31 Acceptable 77.6 8.4 5.9 29 76
07/08/2014 75 Beach Advisory 77.6 2.7 12.2 18 99
06/13/2014 110 Beach Advisory 68.0 8.7 28.2 26 95
05/13/2014 20 Acceptable 59.3 4.5 2.1 94 96
10/17/2013 20 Acceptable 66.4 9.1 3.0 7 87
09/19/2013 <10 Acceptable 69.5 7.3 3.9 17 85
08/15/2013 73 Beach Advisory 74.7 5.0 6.4 14 92
07/18/2013 85 Beach Advisory 75.3 3.5 4.9 17 85
06/20/2013 41 Acceptable 69.4 1.4 3.8 18 92
05/30/2013 20 Acceptable 66.8 2.1 0.8 62 92
10/11/2012 389 Beach Advisory 62.7 5.3 6.2 27 88
09/11/2012 10 Acceptable 75.1 8.3 7.0 30 89
08/14/2012 10 Acceptable 80.9 9.4 4.4 9 96
08/13/2012 10 Acceptable 81.2 9.1 14.8 8 96
07/17/2012 10 Acceptable 81.3 10.8 22.2 10 112
06/12/2012 75 Beach Advisory 71.8 4.0 4.3 25 83
05/16/2012 31 Acceptable 64.6 1.3 4.5 51 104
10/20/2011 86 Beach Advisory 64.2 1.1 0.5 137 93
09/15/2011 86 Beach Advisory 71.2 0.1 2.0 107 81
08/17/2011 <10 Acceptable 80.0 6.6 3.9 28 89
08/15/2011 158 Beach Advisory n/a n/a n/a n/a n/a
07/18/2011 <10 Acceptable 81.9 4.2 16.7 19 n/a
06/28/2011 41 Acceptable 78.8 2.1 7.0 2 102
05/17/2011 >24196 Beach Advisory 59.6 2.8 3.0 80 90
10/13/2010 >24196 Beach Advisory 63.6 0.3 6.9 26 87
09/12/2010 <10 Acceptable 72.5 9.3 7.4 19 76
08/18/2010 10 Acceptable 78.9 9.3 9.7 33 85
07/22/2010 3654 Beach Advisory 82.2 9.1 37.8 12 175
08/22/2009 2310 Beach Advisory 80.3 4.9 35.0 20 90
09/27/2008 74 Beach Advisory n/a n/a n/a n/a n/a
09/09/2008 213 Beach Advisory n/a n/a n/a n/a n/a
08/21/2008 10 Acceptable 76.1 6.4 3.9 32 85
08/06/2008 3873 Beach Advisory 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:

Tarrytown, NY
This large marina has boating and fishing.

Agencies Responsible:

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

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