Yonkers mid-channel

Yonkers midchannel 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

79 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
09/10/2017<10Acceptable0.00.00.00.10.1
08/13/2017<10Acceptable0.00.40.30.00.8
07/09/2017<10Acceptable0.00.02.20.02.2
06/11/2017<10Acceptable0.00.00.00.00.0
05/14/201762Beach Advisory0.11.70.00.01.8
04/04/201730Acceptable1.10.00.00.11.2
10/12/2016<10Acceptable0.00.00.00.10.1
09/13/2016<10Acceptable0.00.00.00.20.2
08/14/2016<10Acceptable0.00.10.20.30.6
07/12/2016<10Acceptable0.00.00.00.80.8
06/14/2016<10Acceptable0.00.00.00.10.1
05/19/2016<10Acceptable0.00.00.00.00.0
10/11/2015<10Acceptable0.00.00.10.00.1
09/10/2015<10Acceptable1.30.00.00.01.3
08/11/20151785Beach Advisory1.00.00.00.01.0
07/07/201510Acceptable0.00.00.00.00.0
06/10/2015<10Acceptable0.00.20.20.00.4
05/11/201510Acceptable0.00.00.00.00.0
10/12/2014<10Acceptable0.00.30.00.00.3
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
06/12/201410Acceptable0.00.00.01.61.6
05/12/201441Acceptable0.00.00.40.00.4
10/16/2013<10Acceptable0.00.00.00.00.0
09/18/201310Acceptable0.00.00.00.00.0
08/14/201310Acceptable0.00.90.10.01.0
07/17/2013<10Acceptable0.00.00.00.00.0
06/19/201310Acceptable0.00.20.00.00.2
05/31/2013<10Acceptable0.00.00.00.50.5
11/08/201241Acceptable0.11.10.00.01.2
10/10/2012<10Acceptable0.30.00.00.20.5
09/10/2012<10Acceptable0.00.00.40.00.4
08/13/2012109Beach Advisory0.00.00.00.20.2
07/16/2012<10Acceptable0.00.30.00.00.3
06/12/2012<10Acceptable0.00.00.00.00.0
05/16/2012<10Acceptable0.10.50.00.00.6
10/21/2011<10Acceptable0.00.01.10.01.1
09/15/2011<10Acceptable0.00.00.00.00.0
08/17/201110Acceptable0.00.00.65.86.4
07/25/201110Acceptable0.00.00.00.00.0
07/22/2011<10Acceptable0.00.00.00.00.0
07/21/2011<10Acceptable0.00.00.00.10.1
07/18/2011<10Acceptable0.00.00.00.00.0
06/28/2011<10Acceptable0.00.00.00.00.0
05/17/201120Acceptable0.70.20.90.01.8
10/13/201010Acceptable0.00.11.10.01.2
09/12/201010Acceptable0.00.00.00.00.0
08/18/2010<10Acceptable0.00.00.10.20.3
07/22/2010<10Acceptable0.00.00.00.10.1
06/16/201020Acceptable0.00.00.00.30.3
05/22/2010<10Acceptable0.00.00.00.00.0
10/19/200920Acceptable0.00.30.00.10.4
09/15/2009<10Acceptable0.00.00.00.00.0
08/21/2009<10Acceptable0.00.00.00.60.6
07/29/2009<10Acceptable0.00.00.61.42.0
06/23/2009<10Acceptable0.00.00.50.30.8
06/06/2009<10Acceptable0.00.90.50.51.9
05/13/200910Acceptable0.00.00.00.00.0
10/21/200841Acceptable0.00.00.00.00.0
10/20/2008<10Acceptable0.00.00.00.00.0
10/19/2008<10Acceptable0.00.00.00.00.0
09/23/200810Acceptable0.00.00.00.00.0
08/19/2008<10Acceptable0.00.00.00.00.0
07/14/2008<10Acceptable0.50.00.00.00.5
07/02/200820Acceptable0.00.00.00.60.6
06/24/2008410Beach Advisory0.00.10.10.00.2
05/19/2008<10Acceptable0.00.10.00.91.0
09/06/2007<10Acceptable0.00.00.00.00.0
08/16/2007<10Acceptable0.00.00.00.00.0
07/11/200759Acceptable0.00.00.00.00.0
06/28/20072Acceptable0.00.70.00.00.7
06/18/20074Acceptable0.00.00.00.00.0
05/23/20073Acceptable0.00.00.00.00.0
04/18/2007<10Acceptable0.00.00.97.68.5
12/13/2006112Beach Advisory0.20.00.00.00.2
11/10/20066Acceptable0.00.03.60.03.6
10/18/200673Beach Advisory0.01.10.00.01.1
09/26/20061Acceptable0.00.00.00.10.1

Entero Count (fecal indicator) and Rainfall Correlation

79 Samples taken

All Water Quality Parameters

79 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
09/10/2017<10Acceptable71.212.42.911.883
08/13/2017<10Acceptable77.88.92.812.178.5
07/09/2017<10Acceptable76.45.23.310.198.0
06/11/2017<10Acceptable68.82.92.217.794.3
05/14/201762Beach Advisory58.50.83.319.298.4
04/04/201730Acceptablen/an/an/an/an/a
10/12/2016<10Acceptable64.812.420.73298
09/13/2016<10Acceptable76.711.240.5n/a131
08/14/2016<10Acceptable83.88.245.711160
07/12/2016<10Acceptable77.98.681198
06/14/2016<10Acceptable69.25.44.221102
05/19/2016<10Acceptable595.83.4n/a96
10/11/2015<10Acceptable65.613.55.41191
09/10/2015<10Acceptable78.514.314.61181
08/11/20151785Beach Advisory76.314.311.21190
07/07/201510Acceptable77.5418.527105
06/10/2015<10Acceptable71.85.57.78111
05/11/201510Acceptable63.17.62.42597
10/12/2014<10Acceptable64.711.42.41784
09/07/201410Acceptable77.112.55.72182
08/11/2014<10Acceptable77.810.34.22077
07/07/2014<10Acceptable76.53.29.41398
06/12/201410Acceptable67.49.643.717110
05/12/201441Acceptable57.84.32.32398
10/16/2013<10Acceptable65.214.54.61783
09/18/201310Acceptable69.511.62.81282
08/14/201310Acceptable76.66.19.81095
07/17/2013<10Acceptable823.65.31692
06/19/201310Acceptable69.71.34.51695
05/31/2013<10Acceptable65.626.22195
11/08/201241Acceptable50.26.51.21894
10/10/2012<10Acceptable64.97.37.1488
09/10/2012<10Acceptable76.79.48.6992
08/13/2012109Beach Advisory81.111.913.510102
07/16/2012<10Acceptable80.312.716.48113
06/12/2012<10Acceptable71.35.66.81789
05/16/2012<10Acceptable622.852198
10/21/2011<10Acceptable62.21.71.44891
09/15/2011<10Acceptable71.30.129785
08/17/201110Acceptable79.28.42.33080
07/25/201110Acceptable82.64.523.77n/a
07/22/2011<10Acceptable84.54.96.821174
07/21/2011<10Acceptablen/an/an/an/an/a
07/18/2011<10Acceptable80.25.62.716n/a
06/28/2011<10Acceptable76.93.210.5795
05/17/201120Acceptable58.76.32.54888
10/13/201010Acceptable64.50.84.31789
09/12/201010Acceptable72.710.84.11275
08/18/2010<10Acceptable78.510.947.61094
07/22/2010<10Acceptable81.211.630.313123
06/16/201020Acceptable71.49.93.82774
05/22/2010<10Acceptable63.58.551492
10/19/200920Acceptable55.910.71.71988
09/15/2009<10Acceptable72.110.82.93785
08/21/2009<10Acceptable80.28.15.41882
07/29/2009<10Acceptable784.47.61887
06/23/2009<10Acceptable70.31.20.93789
06/06/2009<10Acceptablen/an/an/an/an/a
05/13/200910Acceptable60.42.822295
10/21/200841Acceptable59.610.52.7991
10/20/2008<10Acceptable61.917.41.91184
10/19/2008<10Acceptable6215.91.51283
09/23/200810Acceptable70.29.42.21084
08/19/2008<10Acceptable77.9932786
07/14/2008<10Acceptable77.69.56.11194
07/02/200820Acceptable7610.95.51487
06/24/2008410Beach Advisory73.98.72.81487
05/19/2008<10Acceptable59.45.11.22894
09/06/2007<10Acceptable75.212.94.51286
08/16/2007<10Acceptable79114.22186
07/11/200759Acceptable76.712.35.81694
06/28/20072Acceptablen/an/an/an/an/a
06/18/20074Acceptablen/an/an/an/an/a
05/23/20073Acceptable62.23.31.38191
04/18/2007<10Acceptable42.70.30.677100
12/13/2006112Beach Advisoryn/an/an/an/an/a
11/10/20066Acceptable52.50.22.15296
10/18/200673Beach Advisory62.37.94892
09/26/20061Acceptable69.67.81.4n/a94

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:

Yonkers, NY
This deep water site has boating and fishing.

Agencies Responsible:

Westchester County Dept. of Health: 914-813-5000, Rockland County Dept. of Health: 845-364-2900 and NYSDEC Region 3: 914-428-2505

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