Dyckman Street Beach

Dyckman St. 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

94 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
09/09/2022 20 Acceptable 0.0 0.0 1.1 0.1 1.2
08/11/2022 31 Acceptable 0.1 0.1 0.0 0.6 0.8
07/14/2022 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/13/2022 75 Beach Advisory 0.0 0.3 0.0 0.0 0.3
05/23/2022 31 Acceptable 0.0 0.0 0.4 0.0 0.5
10/25/2021 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/13/2021 10 Acceptable 0.0 0.0 0.0 0.1 0.1
08/16/2021 10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/19/2021 10 Acceptable 0.0 0.6 0.0 0.0 0.6
06/07/2021 <10 Acceptable 0.0 0.0 0.7 0.3 1.0
05/17/2021 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/13/2020 63 Beach Advisory 0.9 0.2 0.0 0.0 1.1
09/17/2020 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/13/2020 74 Beach Advisory 1.5 0.0 0.0 0.0 1.5
07/13/2020 52 Acceptable 0.1 0.0 2.5 0.0 2.6
06/15/2020 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/25/2020 10 Acceptable 0.0 0.0 0.8 0.0 0.8
10/07/2019 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/09/2019 <10 Acceptable 0.0 0.0 0.0 0.3 0.3
08/05/2019 41 Acceptable 0.0 0.0 0.2 0.0 0.2
07/08/2019 20 Acceptable 0.0 0.0 0.0 0.0 0.0
06/03/2019 20 Acceptable 0.0 0.3 0.0 0.0 0.3
05/06/2019 10 Acceptable 0.0 1.3 0.1 0.1 1.5
10/09/2018 10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/09/2018 20 Acceptable 0.5 0.0 0.0 0.4 0.8
08/13/2018 243 Beach Advisory 0.7 0.0 2.9 0.0 3.6
07/16/2018 86 Beach Advisory 0.0 0.6 0.4 0.0 1.0
06/12/2018 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/05/2018 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/15/2017 <10 Acceptable 0.0 0.1 0.0 0.1 0.2
09/10/2017 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/13/2017 41 Acceptable 0.0 0.1 0.0 0.0 0.1
07/09/2017 <10 Acceptable 0.0 0.0 1.8 0.0 1.8
06/11/2017 10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/14/2017 10 Acceptable 0.0 1.6 0.0 0.0 1.6
10/12/2016 10 Acceptable 0.0 0.0 0.0 0.6 0.6
09/13/2016 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/14/2016 <10 Acceptable 0.0 0.0 0.3 0.2 0.5
07/12/2016 <10 Acceptable 0.0 0.0 0.0 0.5 0.5
06/14/2016 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/19/2016 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/11/2015 50 Acceptable 0.0 0.0 0.9 0.0 0.9
09/10/2015 794 Beach Advisory 1.6 0.0 0.0 0.0 1.6
08/11/2015 2909 Beach Advisory 1.2 0.0 0.0 0.0 1.2
07/07/2015 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/10/2015 <10 Acceptable 0.0 0.0 0.1 0.0 0.1
05/11/2015 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/12/2014 20 Acceptable 0.0 0.3 0.0 0.0 0.3
09/07/2014 <10 Acceptable 0.0 0.1 0.0 0.0 0.1
08/11/2014 20 Acceptable 0.0 0.0 0.0 0.0 0.0
07/07/2014 10 Acceptable 0.0 0.0 0.0 0.1 0.1
06/12/2014 41 Acceptable 0.0 0.0 0.0 1.6 1.6
05/12/2014 20 Acceptable 0.0 0.0 0.4 0.0 0.4
10/16/2013 10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/18/2013 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/14/2013 10 Acceptable 0.0 0.9 0.1 0.0 0.9
07/17/2013 41 Acceptable 0.0 0.0 0.0 0.0 0.0
06/19/2013 75 Beach Advisory 0.0 0.2 0.0 0.0 0.2
05/31/2013 20 Acceptable 0.0 0.0 0.0 0.5 0.5
11/08/2012 86 Beach Advisory 0.1 1.1 0.0 0.0 1.2
10/10/2012 <10 Acceptable 0.3 0.0 0.0 0.2 0.5
09/10/2012 20 Acceptable 0.0 0.0 0.4 0.0 0.4
08/13/2012 <10 Acceptable 0.0 0.0 0.0 0.2 0.2
07/16/2012 <10 Acceptable 0.0 0.3 0.0 0.0 0.3
06/11/2012 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/15/2012 10 Acceptable 0.5 0.0 0.0 0.0 0.5
10/21/2011 97 Beach Advisory 0.0 0.0 1.1 0.0 1.1
09/14/2011 52 Acceptable 0.0 0.0 0.0 0.0 0.0
08/16/2011 144 Beach Advisory 0.0 0.6 5.8 0.0 6.4
07/25/2011 110 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/22/2011 12033 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/21/2011 >24196 Beach Advisory 0.0 0.0 0.0 0.1 0.1
07/19/2011 <10 Acceptable 0.0 0.1 0.0 0.0 0.1
06/27/2011 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/16/2011 75 Beach Advisory 0.2 0.9 0.0 0.0 1.1
10/12/2010 41 Acceptable 0.1 1.1 0.0 0.0 1.2
09/11/2010 30 Acceptable 0.0 0.0 0.0 0.0 0.0
08/17/2010 41 Acceptable 0.0 0.1 0.2 0.0 0.3
07/21/2010 <10 Acceptable 0.0 0.0 0.1 0.0 0.1
06/15/2010 20 Acceptable 0.0 0.0 0.3 0.0 0.3
05/21/2010 <10 Acceptable 0.0 0.0 0.0 1.1 1.1
10/19/2009 10 Acceptable 0.0 0.3 0.0 0.1 0.4
09/14/2009 <10 Acceptable 0.0 0.0 0.0 0.8 0.9
08/20/2009 <10 Acceptable 0.0 0.0 0.6 0.0 0.6
07/28/2009 <10 Acceptable 0.0 0.6 1.4 0.0 2.0
06/22/2009 41 Acceptable 0.0 0.5 0.3 0.0 0.7
06/06/2009 20 Acceptable 0.0 0.9 0.5 0.5 2.0
05/12/2009 52 Acceptable 0.0 0.0 0.0 0.6 0.6
10/20/2008 10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/24/2008 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/19/2008 10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/14/2008 79 Beach Advisory 0.5 0.0 0.0 0.0 0.5
07/02/2008 15 Acceptable 0.0 0.0 0.0 0.6 0.6
05/19/2008 <10 Acceptable 0.0 0.1 0.0 0.9 1.1

Entero Count (fecal indicator) and Rainfall Correlation

94 Samples taken

All Water Quality Parameters

94 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
09/09/2022 20 Acceptable 77.0 16.3 2.7 13.2 66.9
08/11/2022 31 Acceptable 79.6 18.7 2.9 15.3 67.0
07/14/2022 <10 Acceptable 74.9 18.2 3.5 20.4 82.1
06/13/2022 75 Beach Advisory 70.6 12.1 3.4 10.7 n/a
05/23/2022 31 Acceptable 63.3 9 1.5 17.6 n/a
10/25/2021 <10 Acceptable 63.878 7.03 3.17 8.5 85
09/13/2021 10 Acceptable 74.714 5.09 2.11 9 82
08/16/2021 10 Acceptable 78.206 8.12 5.59 6.1 87.3
07/19/2021 10 Acceptable 79.178 2.84 3.89 5.6 84.4
06/07/2021 <10 Acceptable 71.924 7.73 7.34 8 110.9
05/17/2021 <10 Acceptable 62.906 4.97 3.26 9.4 102.7
10/13/2020 63 Beach Advisory 63.266 15.61 3.03 27.9 85.3
09/17/2020 <10 Acceptable 73.184 17.01 2.28 18.2 68.6
08/13/2020 74 Beach Advisory 82.4 9.71 102.11 8.9 154.1
07/13/2020 52 Acceptable 81.392 11.81 10.13 6 115.8
06/15/2020 <10 Acceptable 71.546 8.55 8.98 6.6 121.8
05/25/2020 10 Acceptable 61.97 11.06 3.35 22.2 99.3
10/07/2019 <10 Acceptable 68.36 13.38 3.24 6.2 87.2
09/09/2019 <10 Acceptable 74.606 10.69 4.68 5.1 87.8
08/05/2019 41 Acceptable 78.224 17.55 2.06 17.2 52.3
07/08/2019 20 Acceptable 76.532 9.85 4.01 11.9 75.9
06/03/2019 20 Acceptable 65.174 9.79 1.54 10 86.3
05/06/2019 10 Acceptable 58.64 6.09 1.45 17.2 93.9
10/09/2018 10 Acceptable 70.664 8.61 2.33 48.1 72.9
09/09/2018 20 Acceptable 76.532 14.89 2.17 15.2 63.7
08/13/2018 243 Beach Advisory 79.142 13.9 3.3 15.7 58.2
07/16/2018 86 Beach Advisory 77.072 17.69 2.75 26.2 67.2
06/12/2018 <10 Acceptable 67.55 14.61 9.75 17 101.6
05/05/2018 10 Acceptable 56.462 1.48 1.89 23.3 105.3
10/15/2017 <10 Acceptable 69.944 15.44 2.31 12.1 77.7
09/10/2017 10 Acceptable 70.988 15.88 1.93 16 73.7
08/13/2017 41 Acceptable 77.198 11.97 2.19 13.3 71.9
07/09/2017 <10 Acceptable 76.118 7.79 3.02 11.4 99.6
06/11/2017 10 Acceptable 68.486 4.88 2.04 18.4 90
05/14/2017 10 Acceptable 58.496 3.02 2 21 97.1
10/12/2016 10 Acceptable 65.372 16.41 7.39 30.8 89.7
09/13/2016 <10 Acceptable 76.964 11.95 44.45 n/a 148.2
08/14/2016 <10 Acceptable 83.93 9.49 71.95 18.7 178.9
07/12/2016 <10 Acceptable 77.756 10.36 7.99 9 103.7
06/14/2016 <10 Acceptable 68.99 7.63 3.61 21.6 98.9
05/19/2016 <10 Acceptable 59.972 9.58 1.8 n/a 96.8
10/11/2015 50 Acceptable 65.822 16.14 2.6 19.1 83
09/10/2015 794 Beach Advisory 77.972 18.41 4.81 9.1 67.7
08/11/2015 2909 Beach Advisory 75.686 18.42 4.29 14.3 74.2
07/07/2015 <10 Acceptable 76.586 6.44 7.41 22.2 91.8
06/10/2015 <10 Acceptable n/a n/a n/a n/a n/a
05/11/2015 <10 Acceptable 59.774 12.13 2.14 33.1 91.3
10/12/2014 20 Acceptable 65.012 16.86 1.61 30.2 76.2
09/07/2014 <10 Acceptable 77.684 11.64 11.33 10.2 95.5
08/11/2014 20 Acceptable 77.846 11.45 0.95 18.8 81.8
07/07/2014 10 Acceptable 75.776 8.79 10.52 12 100.7
06/12/2014 41 Acceptable 67.694 10.55 33.29 24.5 115.2
05/12/2014 20 Acceptable 60.242 4.34 2.7 19.7 100
10/16/2013 10 Acceptable 65.264 19 1.52 11.2 77.8
09/18/2013 10 Acceptable 69.476 17.98 1.98 15.8 71.6
08/14/2013 10 Acceptable 75.92 10.93 9.28 25.5 96.8
07/17/2013 41 Acceptable 80.132 9.39 6.46 134.1 93.3
06/19/2013 75 Beach Advisory 69.602 4.91 3.59 17.6 92.4
05/31/2013 20 Acceptable 66.11 6.44 3.48 54.2 91.3
11/08/2012 86 Beach Advisory 51.206 10.08 0.94 17.6 91.1
10/10/2012 <10 Acceptable 65.93 8.83 7.62 3.6 93.2
09/10/2012 20 Acceptable 76.424 12.22 9.22 66 92.9
08/13/2012 <10 Acceptable 83.3 11.94 13.38 9.1 164.7
07/16/2012 <10 Acceptable 83.57 13.07 23.15 9.7 174.9
06/11/2012 <10 Acceptable 71.042 9.12 6.1 n/a 81.9
05/15/2012 10 Acceptable 62.582 2.91 9.69 17.4 103
10/21/2011 97 Beach Advisory 62.186 4.26 1.64 41.7 90
09/14/2011 52 Acceptable 71.474 1.01 1.93 197.6 80.3
08/16/2011 144 Beach Advisory 78.17 12.63 1.7 73.6 69.6
07/25/2011 110 Beach Advisory 81.9 6.61 22.62 9.2 139.8
07/22/2011 12033 Beach Advisory 84.7 6.82 30.94 15 179.7
07/21/2011 >24196 Beach Advisory n/a n/a n/a n/a n/a
07/19/2011 <10 Acceptable 78.728 11.96 1.79 28.5 73.7
06/27/2011 <10 Acceptable 78.134 2.61 14.74 41.8 104.1
05/16/2011 75 Beach Advisory 58.64 6.3 2.79 259.7 86.8
10/12/2010 41 Acceptable 66.11 6.42 4.52 15.7 85.6
09/11/2010 30 Acceptable 73.598 17.29 1.98 42.9 66.8
08/17/2010 41 Acceptable 78.728 15.87 5.54 10.8 73.8
07/21/2010 <10 Acceptable 83.12 11.58 73.77 11.4 187.5
06/15/2010 20 Acceptable 70.52 14.27 2.49 41.2 68
05/21/2010 <10 Acceptable 62.294 11.6 3.3 19.9 89.5
10/19/2009 10 Acceptable 56.12 12.03 n/a n/a 88.2
09/14/2009 <10 Acceptable 73.922 10.05 3.36 26 89.8
08/20/2009 <10 Acceptable 80.186 10.71 3.41 22.7 80.8
07/28/2009 <10 Acceptable 76.748 11.09 2.42 16.3 75.1
06/22/2009 41 Acceptable 70.214 2.02 0.88 80 84.2
06/06/2009 20 Acceptable n/a n/a n/a n/a n/a
05/12/2009 52 Acceptable 60.566 5.01 1.3 18.5 93.8
10/20/2008 10 Acceptable 62.168 19.87 1.39 9.6 80.3
09/24/2008 <10 Acceptable 70.9 12.04 2.58 8.2 85
08/19/2008 10 Acceptable 77.2 11.2 1.3 22 77.6
07/14/2008 79 Beach Advisory 78.962 9.56 12.63 10.2 121.6
07/02/2008 15 Acceptable 78.224 10.82 12.8 20.8 108.4
05/19/2008 <10 Acceptable 59.36 7.5 1.13 37.5 92.8

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:

Manhattan, NY
The sample site at Inwood Hill Park has fishing, kayaking, team rowing, recreational boating and casual water contact at the beach. There is a combined sewer overflow (CSO) under the pier at this site.

Agencies Responsible:

NYCDEP: 212-639-9675 and NYSDEC Region 2: 718-482-4933

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