George Washington Bridge mid-channel

George Wash Bridge midchan copy

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

77 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
10/15/201710Acceptable0.00.10.00.10.2
09/10/2017<10Acceptable0.00.00.00.00.0
08/13/2017<10Acceptable0.00.10.00.00.1
07/09/2017<10Acceptable0.00.01.80.01.8
06/11/201710Acceptable0.00.00.00.00.0
05/14/201741Acceptable0.01.60.00.01.6
04/04/201741Acceptable1.20.00.00.01.2
10/12/2016<10Acceptable0.00.00.00.60.6
09/13/2016<10Acceptable0.00.00.00.00.0
08/14/2016<10Acceptable0.00.00.30.20.5
07/12/201610Acceptable0.00.00.00.50.5
06/14/2016<10Acceptable0.00.00.00.00.0
05/19/2016<10Acceptable0.00.00.00.00.0
10/11/2015<10Acceptable0.00.00.90.00.9
09/10/201595Beach Advisory1.60.00.00.01.6
08/11/20151086Beach Advisory1.20.00.00.01.2
07/07/2015<10Acceptable0.00.00.00.00.0
06/10/2015<10Acceptable0.00.00.10.00.1
05/11/2015<10Acceptable0.00.00.00.00.0
10/12/2014<10Acceptable0.00.30.00.00.3
09/07/2014<10Acceptable0.00.10.00.00.1
08/11/2014<10Acceptable0.00.00.00.00.0
07/07/201430Acceptable0.00.00.00.10.1
06/12/201420Acceptable0.00.00.01.61.6
05/12/201420Acceptable0.00.00.40.00.4
10/16/201320Acceptable0.00.00.00.00.0
09/18/201363Beach Advisory0.00.00.00.00.0
08/14/201352Acceptable0.00.90.10.01.0
07/17/2013<10Acceptable0.00.00.00.00.0
06/19/2013<10Acceptable0.00.20.00.00.2
05/31/201320Acceptable0.00.00.00.50.5
11/08/201284Beach Advisory0.11.10.00.01.2
10/10/2012<10Acceptable0.30.00.00.20.5
09/10/201210Acceptable0.00.00.40.00.4
08/13/2012<10Acceptable0.00.00.00.20.2
07/16/2012<10Acceptable0.00.30.00.00.3
06/11/2012<10Acceptable0.00.00.00.00.0
05/15/201210Acceptable0.50.00.00.00.5
10/21/201152Acceptable0.00.01.10.01.1
09/14/201130Acceptable0.00.00.00.00.0
08/16/201120Acceptable0.00.65.80.06.4
07/25/201110Acceptable0.00.00.00.00.0
07/22/201120Acceptable0.00.00.00.00.0
07/21/2011313Beach Advisory0.00.00.00.10.1
07/19/2011<10Acceptable0.00.10.00.00.1
06/27/2011<10Acceptable0.00.00.00.00.0
05/16/201141Acceptable0.20.90.00.01.1
10/12/2010110Beach Advisory0.11.10.00.01.2
09/11/2010<10Acceptable0.00.00.00.00.0
08/17/2010<10Acceptable0.00.10.20.00.3
07/21/2010<10Acceptable0.00.00.10.00.1
06/15/201010Acceptable0.00.00.30.00.3
05/21/2010<10Acceptable0.00.00.01.11.1
10/19/200910Acceptable0.00.30.00.10.4
09/14/2009<10Acceptable0.00.00.00.80.8
08/20/2009<10Acceptable0.00.00.60.00.6
07/28/2009<10Acceptable0.00.61.40.02.0
06/22/2009<10Acceptable0.00.50.30.00.8
06/06/2009<10Acceptable0.00.90.50.51.9
05/12/200910Acceptable0.00.00.00.60.6
10/20/2008<10Acceptable0.00.00.00.00.0
09/24/2008<10Acceptable0.00.00.00.00.0
08/19/2008<10Acceptable0.00.00.00.00.0
07/14/200831Acceptable0.50.00.00.00.5
07/02/200816Acceptable0.00.00.00.60.6
06/24/2008134Beach Advisory0.00.10.10.00.2
05/19/2008<10Acceptable0.00.10.00.91.0
09/06/20071Acceptable0.00.00.00.00.0
08/16/20076Acceptable0.00.00.00.00.0
07/11/20071500Beach Advisory1.00.00.00.01.0
06/18/200711Acceptable0.00.00.00.00.0
05/23/20075Acceptable0.00.00.00.00.0
04/18/2007246Beach Advisory0.00.00.97.68.5
12/13/200646Acceptable0.20.00.00.00.2
11/10/200672Beach Advisory0.00.03.60.03.6
10/18/200629Acceptable0.01.10.00.01.1
09/26/20062Acceptable0.00.00.00.10.1

Entero Count (fecal indicator) and Rainfall Correlation

77 Samples taken

All Water Quality Parameters

77 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
10/15/201710Acceptable69.915.33.37.382.2
09/10/2017<10Acceptable70.817.22.31476.1
08/13/2017<10Acceptable77.912.62.313.269.4
07/09/2017<10Acceptable74.89.12.710.993.2
06/11/201710Acceptable68.55.61.814.892.4
05/14/201741Acceptable57.44.02.223.092.5
04/04/201741Acceptable41.91.22.027.6100.3
10/12/2016<10Acceptable65.214.817.631103
09/13/2016<10Acceptable76.811.634.9n/a136
08/14/2016<10Acceptable83.61054.520171
07/12/201610Acceptable76.613.37.1997
06/14/2016<10Acceptable69.47.14.523102
05/19/2016<10Acceptable59.792.6n/a97
10/11/2015<10Acceptable65.917.52.71184
09/10/201595Beach Advisory77.818.55.5975
08/11/20151086Beach Advisory75.219.25.1978
07/07/2015<10Acceptable776.881798
06/10/2015<10Acceptable69.68.33.5792
05/11/2015<10Acceptable61.213.13.72795
10/12/2014<10Acceptable65.117.41.71581
09/07/2014<10Acceptable77.511.86.6992
08/11/2014<10Acceptable77.712.20.81977
07/07/201430Acceptable76.18.25.6998
06/12/201420Acceptable67.112.128.723109
05/12/201420Acceptable59.74.72.826100
10/16/201320Acceptable65.219.91.62278
09/18/201363Beach Advisory6919.91.91672
08/14/201352Acceptable75.712.26.52292
07/17/2013<10Acceptable81.17.87.19499
06/19/2013<10Acceptable70.63.33.81596
05/31/201320Acceptable67.45.34.74596
11/08/201284Beach Advisory50.78.90.92892
10/10/2012<10Acceptable65.98.47.4493
09/10/201210Acceptable76.811.712.66699
08/13/2012<10Acceptable82.113.512.78147
07/16/2012<10Acceptable82.214.516.18153
06/11/2012<10Acceptable71.49.15.3n/a86
05/15/201210Acceptable62.23.23.72398
10/21/201152Acceptable61.83.41.73092
09/14/201130Acceptable71.91.31.811981
08/16/201120Acceptable78.412.22.32978
07/25/201110Acceptable82.36.419.49135
07/22/201120Acceptable83.68.825.473171
07/21/2011313Beach Advisoryn/an/an/an/an/a
07/19/2011<10Acceptable80.910.92.71186
06/27/2011<10Acceptable76.62.713.269100
05/16/201141Acceptable58.66.42.824288
10/12/2010110Beach Advisory65.99.93.61682
09/11/2010<10Acceptable73.816.61.92068
08/17/2010<10Acceptable8014.97.1685
07/21/2010<10Acceptable83.11277.711190
06/15/201010Acceptable71.61641875
05/21/2010<10Acceptable62.511.33.31789
10/19/200910Acceptable56.512.9n/an/a88
09/14/2009<10Acceptable74.39.53.82792
08/20/2009<10Acceptable80.510.22.32079
07/28/2009<10Acceptable77.510.83.21679
06/22/2009<10Acceptable70.32.30.96284
06/06/2009<10Acceptablen/an/an/an/an/a
05/12/200910Acceptable60.45.11.32093
10/20/2008<10Acceptable61.921.81.5782
09/24/2008<10Acceptable70.911.72.3885
08/19/2008<10Acceptable76.713.41.21478
07/14/200831Acceptable78.610.16.310101
07/02/200816Acceptable77.511.77.614101
06/24/2008134Beach Advisory73.913.24.1991
05/19/2008<10Acceptable59.27.41.12993
09/06/20071Acceptable75.117.25.71190
08/16/20076Acceptable78.315.82.41775
07/11/20071500Beach Advisory7319.24.88489
06/18/200711Acceptablen/an/an/an/an/a
05/23/20075Acceptable63.47.71.146n/a
04/18/2007246Beach Advisory43.60.50.34699
12/13/200646Acceptable44.84.81.11798
11/10/200672Beach Advisory52.631.35193
10/18/200629Acceptablen/an/an/an/an/a
09/26/20062Acceptable71.314.50.3n/a89

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
This deep water sample site at the George Washington Bridge has recreational boating, jet-skiing, kayaking and occasional swim events.

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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