Yonkers Sewage Treatment Plant Outfall

Yonkers WWTP Outfall

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

78 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
08/13/201731Acceptable0.00.40.30.00.8
07/09/201741Acceptable0.00.02.20.02.2
06/11/2017<10Acceptable0.00.00.00.00.0
05/14/2017189Beach Advisory0.11.70.00.01.8
04/04/2017110Beach Advisory1.10.00.00.11.2
10/12/201620Acceptable0.00.00.00.10.1
09/13/2016<10Acceptable0.00.00.00.20.2
08/14/201610Acceptable0.00.10.20.30.6
07/12/201631Acceptable0.00.00.00.80.8
06/14/2016<10Acceptable0.00.00.00.10.1
05/19/2016<10Acceptable0.00.00.00.00.0
10/11/201560Acceptable0.00.00.10.00.1
09/10/201510Acceptable1.30.00.00.01.3
08/11/201598Beach Advisory1.00.00.00.01.0
07/07/201510Acceptable0.00.00.00.00.0
06/10/2015<10Acceptable0.00.20.20.00.4
05/11/2015<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
07/07/201410Acceptable0.00.00.00.10.1
06/12/201410Acceptable0.00.00.01.61.6
05/12/201420Acceptable0.00.00.40.00.4
10/16/201331Acceptable0.00.00.00.00.0
09/18/201341Acceptable0.00.00.00.00.0
08/14/201375Beach Advisory0.00.90.10.01.0
07/17/201320Acceptable0.00.00.00.00.0
06/19/201341Acceptable0.00.20.00.00.2
05/31/201320Acceptable0.00.00.00.50.5
11/08/20122400Beach Advisory0.11.10.00.01.2
10/10/2012<10Acceptable0.30.00.00.20.5
09/10/201230Acceptable0.00.00.40.00.4
08/13/2012<10Acceptable0.00.00.00.20.2
07/16/2012<10Acceptable0.00.30.00.00.3
06/12/2012<10Acceptable0.00.00.00.00.0
05/16/201210Acceptable0.10.50.00.00.6
10/21/201185Beach Advisory0.00.01.10.01.1
09/15/201120Acceptable0.00.00.00.00.0
08/17/2011<10Acceptable0.00.00.65.86.4
07/25/201186Beach Advisory0.00.00.00.00.0
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
10/13/201031Acceptable0.00.11.10.01.2
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
06/16/2010<10Acceptable0.00.00.00.30.3
05/22/201041Acceptable0.00.00.00.00.0
10/19/200910Acceptable0.00.30.00.10.4
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
06/06/200910Acceptable0.00.90.50.51.9
05/13/200910Acceptable0.00.00.00.00.0
10/21/2008<10Acceptable0.00.00.00.00.0
10/20/200810Acceptable0.00.00.00.00.0
10/19/200820Acceptable0.00.00.00.00.0
09/23/2008<10Acceptable0.00.00.00.00.0
08/19/200810Acceptable0.00.00.00.00.0
07/14/200815Acceptable0.50.00.00.00.5
07/02/200815Acceptable0.00.00.00.60.6
06/24/200813Acceptable0.00.10.10.00.2
05/19/200820Acceptable0.00.10.00.91.0
09/06/200718Acceptable0.00.00.00.00.0
08/16/2007<10Acceptable0.00.00.00.00.0
07/11/2007<10Acceptable0.00.00.00.00.0
06/18/20073Acceptable0.00.00.00.00.0
05/23/20076Acceptable0.00.00.00.00.0
04/18/2007103Beach Advisory0.00.00.97.68.5
12/13/200640Acceptable0.20.00.00.00.2
11/10/200622Acceptable0.00.03.60.03.6
10/18/200612Acceptable0.01.10.00.01.1
09/26/200623Acceptable0.00.00.00.10.1

Entero Count (fecal indicator) and Rainfall Correlation

78 Samples taken

All Water Quality Parameters

78 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<10Acceptable70.913.12.627.172
08/13/201731Acceptable76.39.62.342.869.6
07/09/201741Acceptable75.37.13.09.998.4
06/11/2017<10Acceptable67.24.42.322.985.1
05/14/2017189Beach Advisory57.73.42.422.498.1
04/04/2017110Beach Advisory41.80.91.932.399.2
10/12/201620Acceptable65.91443185
09/13/2016<10Acceptable76.413.219.3n/a112
08/14/201610Acceptable82.410.944.519149
07/12/201631Acceptable77.110.78.410102
06/14/2016<10Acceptable68.48.44.23297
05/19/2016<10Acceptable59.66.22.7n/a98
10/11/201560Acceptable66.414.42.53279
09/10/201510Acceptable7816.54.11465
08/11/201598Beach Advisory75.914.562180
07/07/201510Acceptable77.35.113.53396
06/10/2015<10Acceptablen/an/an/an/an/a
05/11/2015<10Acceptable61.5102.84591
10/12/2014<10Acceptable6512.32.24875
09/07/2014<10Acceptable76.513.63.22273
08/11/2014<10Acceptable76.412.62.98667
07/07/201410Acceptable75.84.27.91199
06/12/201410Acceptable66.312.127.324104
05/12/201420Acceptable57.85.222197
10/16/201331Acceptable65.815.72.41778
09/18/201341Acceptable70142.84370
08/14/201375Beach Advisory75.88.35.32582
07/17/201320Acceptable797.63.92082
06/19/201341Acceptable692.83.61992
05/31/201320Acceptable64.73.52.56890
11/08/20122400Beach Advisory51.99.112289
10/10/2012<10Acceptable65.310.45.4485
09/10/201230Acceptable76.111.45.41582
08/13/2012<10Acceptable80.512.713.48100
07/16/2012<10Acceptable76.617.74.31572
06/12/2012<10Acceptable70.97.55.42480
05/16/201210Acceptable62.13.54.61897
10/21/201185Beach Advisory62.72.61.47190
09/15/201120Acceptable70.90.21.813481
08/17/2011<10Acceptable77.88.3211072
07/25/201186Beach Advisory80.78.319.713n/a
07/22/2011<10Acceptable846.42815156
07/21/2011<10Acceptablen/an/an/an/an/a
07/18/2011<10Acceptable77.56.32.454n/a
06/28/2011<10Acceptable755.18.2297
05/17/201120Acceptable59.25.3n/an/a68
10/13/201031Acceptable64.52.43.51685
09/12/201010Acceptable7312.43.76066
08/18/2010<10Acceptable77.213.18.8973
07/22/2010<10Acceptable7913.420.81676
06/16/2010<10Acceptable70.89.32.24170
05/22/201041Acceptable60.213.13.78881
10/19/200910Acceptable56.512.51.75883
09/15/2009<10Acceptable72.1131.53766
08/21/2009<10Acceptable79.68.94.55273
07/29/2009<10Acceptable76.86.131879
06/23/2009<10Acceptable70.21.40.94289
06/06/200910Acceptablen/an/an/an/an/a
05/13/200910Acceptable60.26.11.77980
10/21/2008<10Acceptable61.812.21.81880
10/20/200810Acceptable62.816.91.32172
10/19/200820Acceptable62.816.91.62978
09/23/2008<10Acceptable70.212.51.31176
08/19/200810Acceptable77.28.32.23084
07/14/200815Acceptable74.611.92.91677
07/02/200815Acceptable75.110.94.32482
06/24/200813Acceptable72.210.11.92577
05/19/200820Acceptable6061.33693
09/06/200718Acceptable74.612.12.41675
08/16/2007<10Acceptable78.411.52.83676
07/11/2007<10Acceptable75.512.66.81990
06/18/20073Acceptablen/an/an/an/an/a
05/23/20076Acceptable63.14.21.18191
04/18/2007103Beach Advisory43.40.40.495100
12/13/200640Acceptable452.61.11296
11/10/200622Acceptable52.50.81.85595
10/18/200612Acceptable63.310.22.51182
09/26/200623Acceptable69.79.11.2n/a87

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 sewage treatment plant treats sewage from much of the western side of Westchester County. The area has boating, kayaking and fishing.

Agencies Responsible:

Westchester County Dept. of Health: 914-813-5000 and NYSDEC Region 3: 914-428-2505

Tell Congress: NY Needs a Robust, Fully Funded EPA
Become a Member