Gowanus Canal

Gowanus Canal

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

62 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
10/15/2017122Beach Advisory0.00.10.00.10.2
09/10/201752Acceptable0.00.00.00.00.0
08/13/201710Acceptable0.00.10.00.00.1
07/09/2017108Beach Advisory0.00.01.80.01.8
06/11/2017<10Acceptable0.00.00.00.00.0
05/14/201752Acceptable0.01.60.00.01.6
04/04/201712997Beach Advisory1.20.00.00.01.2
10/12/201652Acceptable0.00.00.00.60.6
09/13/2016<10Acceptable0.00.00.00.00.0
08/14/201620Acceptable0.00.00.30.20.5
07/12/201631Acceptable0.00.00.00.50.5
06/14/2016<10Acceptable0.00.00.00.00.0
05/19/201620Acceptable0.00.00.00.00.0
10/11/201520Acceptable0.00.00.90.00.9
09/10/2015816Beach Advisory1.60.00.00.01.6
08/11/201524196Beach Advisory1.20.00.00.01.2
07/07/2015<10Acceptable0.10.00.00.00.1
06/10/201531Acceptable0.00.00.10.00.1
05/11/201510Acceptable0.00.00.00.00.0
10/12/2014106Beach Advisory0.00.30.00.00.3
09/07/2014754Beach Advisory0.00.10.00.00.1
08/11/2014<10Acceptable0.00.00.00.00.0
07/07/2014<10Acceptable0.00.00.00.10.1
06/12/201474Beach Advisory0.00.00.01.61.6
05/12/201484Beach Advisory0.00.00.40.00.4
10/16/201363Beach Advisory0.00.00.00.00.0
09/18/201341Acceptable0.00.00.00.00.0
08/14/2013364Beach Advisory0.00.90.10.01.0
07/17/2013<10Acceptable0.00.00.00.00.0
06/19/201320Acceptable0.00.20.00.00.2
05/31/201398Beach Advisory0.00.00.00.50.5
11/08/2012>24196Beach Advisory0.11.10.00.01.2
10/10/2012259Beach Advisory0.30.00.00.20.5
09/10/2012<10Acceptable0.00.00.40.00.4
08/13/2012<10Acceptable0.00.00.00.20.2
07/16/2012241Beach Advisory0.00.30.00.00.3
06/11/201210Acceptable0.00.00.00.00.0
05/15/2012>24196Beach Advisory0.50.00.00.00.5
10/21/201196Beach Advisory0.00.01.10.01.1
09/14/201141Acceptable0.00.00.00.00.0
08/16/20112603Beach Advisory0.00.65.80.06.4
07/19/20111046Beach Advisory0.00.10.00.00.1
06/27/2011<10Acceptable0.00.00.00.00.0
05/16/2011>24196Beach Advisory0.20.90.00.01.1
10/12/2010>24196Beach Advisory0.11.10.00.01.2
09/11/2010<10Acceptable0.00.00.00.00.0
08/17/20104884Beach Advisory0.00.10.20.00.3
08/09/201010Acceptable0.00.00.00.00.0
06/10/2010882Beach Advisory0.00.90.00.00.9
09/02/2009<10Acceptable0.00.00.00.00.0
07/15/2009<10Acceptable0.00.00.00.00.0
06/19/2009160Beach Advisory0.02.30.00.02.3
05/29/200917329Beach Advisory0.40.10.00.00.5
10/15/200820Acceptable0.00.00.00.00.0
07/23/20085790Beach Advisory1.00.00.00.01.0
05/16/2008>24196Beach Advisory0.00.10.00.91.0
09/06/2007<10Acceptable0.00.00.00.00.0
08/16/200735Acceptable0.00.00.00.00.0
07/11/2007238Beach Advisory1.00.00.00.01.0
06/18/20076Acceptable0.00.00.00.00.0
05/23/200710Acceptable0.00.00.00.00.0
04/18/2007274Beach Advisory0.00.00.97.68.5

Entero Count (fecal indicator) and Rainfall Correlation

62 Samples taken

All Water Quality Parameters

62 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
10/15/2017122Beach Advisory69.024.41.93.3104.5
09/10/201752Acceptable70.423.22.56.4105.6
08/13/201710Acceptable75.423.32.76.698.5
07/09/2017108Beach Advisory74.220.58.613.5110.9
06/11/2017<10Acceptable70.416.813.15.5122.4
05/14/201752Acceptable57.915.66.010.5100.3
04/04/201712997Beach Advisory44.614.32.39.9106.0
10/12/201652Acceptable66.3251.632105
09/13/2016<10Acceptable76.824.75n/a111
08/14/201620Acceptable82.923.945.824170
07/12/201631Acceptable74.923.726100
06/14/2016<10Acceptable6721.41.828102
05/19/201620Acceptable57.521.81.9n/a113
10/11/201520Acceptable66.124.82.37104
09/10/2015816Beach Advisory76.926.49.59100
08/11/201524196Beach Advisory75.120.33.51085
07/07/2015<10Acceptable7620.94.1496
06/10/201531Acceptable66.122.31.4n/a104
05/11/201510Acceptable58.523.44.111108
10/12/2014106Beach Advisory65.125.31.5696
09/07/2014754Beach Advisory76.624.118.4695
08/11/2014<10Acceptable75.523.81.34682
07/07/2014<10Acceptable76.815.815.44105
06/12/201474Beach Advisory64.322.63.4473
05/12/201484Beach Advisory61.317.45.59104
10/16/201363Beach Advisory65.624.62.3423
09/18/201341Acceptable67.825.63.8108
08/14/2013364Beach Advisory73.123.67.7449
07/17/2013<10Acceptable80.820.659.79190
06/19/201320Acceptable70.415.461386
05/31/201398Beach Advisory66.718.82.81977
11/08/2012>24196Beach Advisory54.411.63.83967
10/10/2012259Beach Advisory66.723.62.61635
09/10/2012<10Acceptable77.124.814.74060
08/13/2012<10Acceptable82.732.824.715302
07/16/2012241Beach Advisory80.431.963.695214
06/11/201210Acceptable72.921.437.9n/a158
05/15/2012>24196Beach Advisory63.515.375886
10/21/201196Beach Advisory61.215.91.6986
09/14/201141Acceptable75.510.827.210142
08/16/20112603Beach Advisory7522.61.42211
07/19/20111046Beach Advisory77.522.949.518154
06/27/2011<10Acceptable74.915.734.328185
05/16/2011>24196Beach Advisory56.318.414.812186
10/12/2010>24196Beach Advisory65.817.53.6783
09/11/2010<10Acceptable72.226.512.117122
08/17/20104884Beach Advisory77.525.319.71252
08/09/201010Acceptablen/an/an/an/an/a
06/10/2010882Beach Advisoryn/an/an/an/an/a
09/02/2009<10Acceptablen/an/an/an/an/a
07/15/2009<10Acceptablen/an/an/an/an/a
06/19/2009160Beach Advisoryn/an/an/an/an/a
05/29/200917329Beach Advisoryn/an/an/an/an/a
10/15/200820Acceptablen/an/an/an/an/a
07/23/20085790Beach Advisory74.225.74672
05/16/2008>24196Beach Advisoryn/an/an/an/an/a
09/06/2007<10Acceptable76.325.41.8563
08/16/200735Acceptable7624.91.21132
07/11/2007238Beach Advisory70.7253.72680
06/18/20076Acceptablen/an/an/an/an/a
05/23/200710Acceptable6519.30.6582
04/18/2007274Beach Advisory45.610.50.15096

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:

ALERT: This site is never safe for swimming or fishing

Brooklyn, NY
The Gowanus Canal is an industrial waterway with limited dockage for recreational boats, and some kayaking and canoeing.

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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