East River mid-channel at 23rd Street

East River at Roosevelt Island

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

75 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
10/16/201710Acceptable0.00.00.10.00.1
09/11/201720Acceptable0.00.00.00.00.0
08/14/2017<10Acceptable0.00.00.10.00.1
07/10/2017<10Acceptable0.00.00.01.81.8
06/12/2017<10Acceptable0.00.00.00.00.0
05/15/201720Acceptable0.00.01.60.01.6
04/04/2017450Beach Advisory1.20.00.00.01.2
10/13/2016<10Acceptable0.00.00.00.00.0
09/14/2016<10Acceptable0.00.00.00.00.0
08/15/2016<10Acceptable0.00.10.00.30.4
07/13/2016<10Acceptable0.00.00.00.00.0
06/15/2016<10Acceptable0.00.00.00.00.0
05/20/2016<10Acceptable0.00.00.00.00.0
10/12/2015<10Acceptable0.00.00.00.90.9
09/11/201586Beach Advisory0.01.60.00.01.6
08/12/201562Beach Advisory0.01.20.00.01.2
07/08/2015<10Acceptable0.00.10.00.00.1
06/11/2015<10Acceptable0.00.00.00.10.1
05/12/2015<10Acceptable0.00.00.00.00.0
10/13/2014<10Acceptable0.00.00.30.00.3
09/07/201410Acceptable0.00.10.00.00.1
08/11/2014<10Acceptable0.00.00.00.00.0
07/07/2014<10Acceptable0.00.00.00.10.1
06/12/2014<10Acceptable0.00.00.01.61.6
05/12/201410Acceptable0.00.00.40.00.4
10/16/201310Acceptable0.00.00.00.00.0
09/18/2013<10Acceptable0.00.00.00.00.0
08/14/2013199Beach Advisory0.00.90.10.01.0
07/17/201310Acceptable0.00.00.00.00.0
06/19/201310Acceptable0.00.20.00.00.2
05/31/2013<10Acceptable0.00.00.00.50.5
11/08/2012121Beach Advisory0.11.10.00.01.2
10/10/201231Acceptable0.30.00.00.20.5
09/10/2012<10Acceptable0.00.00.40.00.4
08/13/2012<10Acceptable0.00.00.00.20.2
07/16/2012<10Acceptable0.00.30.00.00.3
06/11/201210Acceptable0.00.00.00.00.0
05/15/2012<10Acceptable0.50.00.00.00.5
10/21/201141Acceptable0.00.01.10.01.1
09/14/201120Acceptable0.00.00.00.00.0
08/16/201198Beach Advisory0.00.65.80.06.4
07/19/2011<10Acceptable0.00.10.00.00.1
06/27/2011<10Acceptable0.00.00.00.00.0
05/16/2011160Beach Advisory0.20.90.00.01.1
10/12/2010399Beach Advisory0.11.10.00.01.2
09/11/2010<10Acceptable0.00.00.00.00.0
08/17/201031Acceptable0.00.10.20.00.3
07/21/2010<10Acceptable0.00.00.10.00.1
06/15/2010<10Acceptable0.00.00.30.00.3
06/03/2010<10Acceptable0.00.00.00.00.0
05/21/201010Acceptable0.00.00.01.11.1
10/29/200920Acceptable0.01.30.60.01.9
10/19/2009<10Acceptable0.00.30.00.10.4
10/09/2009<10Acceptable0.00.00.20.00.2
09/14/2009<10Acceptable0.00.00.00.80.8
08/20/2009<10Acceptable0.00.00.60.00.6
07/28/200910Acceptable0.00.61.40.02.0
06/22/200952Acceptable0.00.40.30.00.7
06/05/200931Acceptable0.90.50.50.12.0
05/12/200910Acceptable0.00.00.00.60.6
10/20/200810Acceptable0.00.00.00.00.0
09/24/2008<10Acceptable0.00.00.00.00.0
08/19/2008<10Acceptable0.00.00.00.00.0
07/23/2008140Beach Advisory1.00.00.00.01.0
07/14/200890Beach Advisory0.50.00.00.00.5
07/02/2008<10Acceptable0.00.00.00.60.6
06/24/200852Acceptable0.00.10.10.00.2
05/19/2008<10Acceptable0.00.10.00.91.0
09/06/20071Acceptable0.00.00.00.00.0
08/16/20074Acceptable0.00.00.00.00.0
07/11/20071Acceptable0.00.00.00.00.0
06/18/20076Acceptable0.00.00.00.00.0
05/23/20075Acceptable0.00.00.00.00.0
05/17/2007109Beach Advisory0.00.80.00.00.8
04/18/2007376Beach Advisory0.00.00.97.68.5

Entero Count (fecal indicator) and Rainfall Correlation

75 Samples taken

All Water Quality Parameters

75 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
10/16/201710Acceptable68.323.81.63.674.1
09/11/201720Acceptable69.823.32.26.270.5
08/14/2017<10Acceptable74.423.12.36.852.6
07/10/2017<10Acceptable70.221.42.19.381.2
06/12/2017<10Acceptable65.218.52.29.384.6
05/15/201720Acceptable55.619.32.27.383.1
04/04/2017450Beach Advisory43.819.017.06.198.8
10/13/2016<10Acceptable66.124.72.33579
09/14/2016<10Acceptable75.124.55.2n/a78
08/15/2016<10Acceptable77.623.952576
07/13/2016<10Acceptable73.323.12.4969
06/15/2016<10Acceptable62.722.53.11689
05/20/2016<10Acceptable55.322.45n/a92
10/12/2015<10Acceptable6524.82.11480
09/11/201586Beach Advisory76.425.44.6764
08/12/201562Beach Advisory74.224.92.6870
07/08/2015<10Acceptable71.122.52.51466
06/11/2015<10Acceptable64.721.61.8172
05/12/2015<10Acceptable56.52351391
10/13/2014<10Acceptable64.924.51.71274
09/07/201410Acceptable75.924.12.5859
08/11/2014<10Acceptable75.522.71.61466
07/07/2014<10Acceptable71.320.34575
06/12/2014<10Acceptable64.121.83.81380
05/12/201410Acceptable53.920.12.15088
10/16/201310Acceptable65.624.71.5480
09/18/2013<10Acceptable69.925.72.51369
08/14/2013199Beach Advisory7323.81.62055
07/17/201310Acceptable74.522.53.21569
06/19/201310Acceptable67.319.72.4973
05/31/2013<10Acceptable62.322.21.4975
11/08/2012121Beach Advisory53.120.11.8887
10/10/201231Acceptable67.224.51.9866
09/10/2012<10Acceptable76.824.32.63456
08/13/2012<10Acceptable78.433.40.9553
07/16/2012<10Acceptable75.132.61.9857
06/11/201210Acceptable68.522.11.7n/a65
05/15/2012<10Acceptable59.121.41.61179
10/21/201141Acceptable64.319.50.61477
09/14/201120Acceptable71.513.71.52474
08/16/201198Beach Advisory7422.911860
07/19/2011<10Acceptable79.621.815.1595
06/27/2011<10Acceptable7119.31.6859
05/16/2011160Beach Advisory55.519.14.516083
10/12/2010399Beach Advisory65.919.71.71573
09/11/2010<10Acceptable70.826.83.61374
08/17/201031Acceptable76.426.32646
07/21/2010<10Acceptable77.825.42.6453
06/15/2010<10Acceptable65.923.30.51568
06/03/2010<10Acceptablen/an/an/an/an/a
05/21/201010Acceptable56.823.72.5977
10/29/200920Acceptablen/an/an/an/an/a
10/19/2009<10Acceptable57.325.31.1581
10/09/2009<10Acceptablen/an/an/an/an/a
09/14/2009<10Acceptable71.324.50.93765
08/20/2009<10Acceptable77.521.91.91960
07/28/200910Acceptable7322.811049
06/22/200952Acceptable67.216.20.61968
06/05/200931Acceptablen/an/an/an/an/a
05/12/200910Acceptable57.319.31.31278
10/20/200810Acceptable62.125.51673
09/24/2008<10Acceptable70.624.85.8787
08/19/2008<10Acceptable73.1231.21067
07/23/2008140Beach Advisory73.524.91.31360
07/14/200890Beach Advisory69.623n/an/a68
07/02/2008<10Acceptable68.624.41.11055
06/24/200852Acceptable68.923.21667
05/19/2008<10Acceptable5721.80.91183
09/06/20071Acceptable74.125.41.7960
08/16/20074Acceptable75.724.51.21760
07/11/20071Acceptable7024.91.1954
06/18/20076Acceptablen/an/an/an/an/a
05/23/20075Acceptable60.220.911380
05/17/2007109Beach Advisory59.120.81.35680
04/18/2007376Beach Advisory46.32.80.219100

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:

Brooklyn, NY
The deep water sampling site around 23rd St. has mostly transitory boat traffic.

The data displayed on these pages relates to the levels of sewage indicating microbes. Even though the levels on a single days can fall within acceptable levels for Enterococcus, these locations are not necessarily acceptable for swimming. Other water quality parameters not reported on this web site such as chemical contamination and floatables should cause users to exercise caution at this site.

Agencies Responsible:

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

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