Water Quality
Water Quality > Water Quality Testing Locations > Rockland County & Westchester County > Yonkers Wastewater Treatment Plant Outfall

Yonkers Wastewater Treatment Plant Outfall

Yonkers WWTP Outfall

About this location:

Yonkers, NY
This wastewater treatment plant treats sewage from much 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

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Basic Sampling Data

Physical, chemical and biological properties of the surface water that are measured continuously while the patrol boat is underway.

Water Quality, Enterococcus Count and Precipitation

44 Samples taken

Sample Date [i] Enterococcus
Count
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Enterococcus Count

Enterococcus is a commonly used indicator of water quality and sewage contamination.

Quality Rain, day
of (in)		 Prior Day 2 Days
Prior		 3 Days
Prior		 5 Days
Prior
10/10/2012 <10 Acceptable 0.3 0.3 0.3 0.5 0.5
09/10/2012 30 Acceptable 0.0 0.0 0.4 0.4 0.5
08/13/2012 <10 Acceptable 0.0 0.0 0.0 0.2 0.2
07/16/2012 <10 Acceptable 0.0 0.3 0.3 0.3 0.3
06/12/2012 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/16/2012 10 Acceptable 0.1 0.6 0.6 0.6 0.6
10/21/2011 85 Possible Risk 0.0 0.0 1.1 1.1 1.1
09/15/2011 20 Acceptable 0.0 0.0 0.0 0.0 0.0
08/17/2011 <10 Acceptable 0.0 0.0 0.6 6.4 6.4
07/18/2011 <10 Acceptable 0.0 0.0 0.0 0.0 0.1
06/28/2011 <10 Acceptable 0.0 0.0 0.0 0.0 0.3
05/17/2011 20 Acceptable 0.7 0.8 1.7 1.7 1.7
10/13/2010 31 Acceptable 0.0 0.1 1.2 1.2 1.2
09/12/2010 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/18/2010 <10 Acceptable 0.0 0.0 0.1 0.3 0.3
07/22/2010 <10 Acceptable 0.0 0.0 0.0 0.1 0.1
06/16/2010 <10 Acceptable 0.0 0.0 0.0 0.3 0.3
05/22/2010 41 Possible Risk 0.0 0.0 0.0 0.0 1.1
10/19/2009 10 Acceptable 0.0 0.3 0.3 0.4 1.0
09/15/2009 <10 Acceptable 0.0 0.0 0.0 0.0 0.9
08/21/2009 <10 Acceptable 0.0 0.0 0.0 0.6 0.6
07/29/2009 <10 Acceptable 0.0 0.0 0.6 2.0 2.0
06/23/2009 <10 Acceptable 0.0 0.0 0.5 0.7 3.0
06/06/2009 10 Acceptable 0.0 0.9 1.5 2.0 2.0
05/13/2009 10 Acceptable 0.0 0.0 0.0 0.0 0.6
10/21/2008 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/20/2008 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/19/2008 20 Acceptable 0.0 0.0 0.0 0.0 0.0
09/23/2008 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/19/2008 10 Acceptable 0.0 0.0 0.0 0.0 1.1
07/14/2008 15 Acceptable 0.5 0.5 0.5 0.5 0.5
07/02/2008 15 Acceptable 0.0 0.0 0.0 0.6 1.1
06/24/2008 13 Acceptable 0.0 0.1 0.1 0.1 0.3
05/19/2008 20 Acceptable 0.0 0.1 0.2 1.1 1.1
09/06/2007 18 Acceptable 0.0 0.0 0.0 0.0 0.0
08/16/2007 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/11/2007 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/18/2007 3 Acceptable 0.0 0.0 0.0 0.0 0.0
05/23/2007 6 Acceptable 0.0 0.0 0.0 0.0 0.2
04/18/2007 103 Possible Risk 0.0 0.0 0.9 8.5 8.5
12/13/2006 40 Possible Risk 0.2 0.2 0.2 0.2 0.2
11/10/2006 22 Acceptable 0.0 0.0 3.6 3.6 3.6
10/18/2006 12 Acceptable 0.0 1.1 1.1 1.1 1.1
09/26/2006 23 Acceptable 0.0 0.0 0.0 0.1 0.1

Basic Sampling Data

44 Samples taken

Sample Date [i] Enterococcus
Count
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Enterococcus Count

Enterococcus is a commonly used indicator of water quality and sewage contamination.

Quality Temperature
(f)		 Salinity Chlorophyll Turbidity Oxygen
10/10/2012 <10 Acceptable 65.3 10.4 5.4 4.3 84.5
09/10/2012 30 Acceptable 76.1 11.4 5.4 15 82
08/13/2012 <10 Acceptable 80.5 12.7 13.4 8 100
07/16/2012 <10 Acceptable 76.6 17.7 4.3 15 72
06/12/2012 <10 Acceptable 70.9 7.5 5.4 24 80
05/16/2012 10 Acceptable 62.1 3.5 4.6 18 97
10/21/2011 85 Possible Risk 62.7 2.6 1.4 71 90
09/15/2011 20 Acceptable 70.9 0.2 1.8 134 81
08/17/2011 <10 Acceptable 77.8 8.3 2.0 110 72
07/18/2011 <10 Acceptable 77.5 6.3 2.4 54 n/a
06/28/2011 <10 Acceptable 75.0 5.1 8.2 2 97
05/17/2011 20 Acceptable 59.2 5.3 n/a n/a 68
10/13/2010 31 Acceptable 64.5 2.4 3.5 16 85
09/12/2010 10 Acceptable 73.0 12.4 3.7 60 66
08/18/2010 <10 Acceptable 77.2 13.1 8.8 9 73
07/22/2010 <10 Acceptable 79.0 13.4 20.8 16 76
06/16/2010 <10 Acceptable 70.8 9.3 2.2 41 70
05/22/2010 41 Possible Risk 60.2 13.1 3.7 88 81
10/19/2009 10 Acceptable 56.5 12.5 1.7 58 83
09/15/2009 <10 Acceptable 72.1 13.0 1.5 37 66
08/21/2009 <10 Acceptable 79.6 8.9 4.5 52 73
07/29/2009 <10 Acceptable 76.8 6.1 3.0 18 79
06/23/2009 <10 Acceptable 70.2 1.4 0.9 42 89
06/06/2009 10 Acceptable n/a n/a n/a n/a n/a
05/13/2009 10 Acceptable 60.2 6.1 1.7 79 80
10/21/2008 <10 Acceptable 61.8 12.2 1.8 18 80
10/20/2008 10 Acceptable 62.8 16.9 1.3 21 72
10/19/2008 20 Acceptable 62.8 16.9 1.6 29 78
09/23/2008 <10 Acceptable 70.2 12.5 1.3 11 76
08/19/2008 10 Acceptable 77.2 8.3 2.2 30 84
07/14/2008 15 Acceptable 74.6 11.9 2.9 16 77
07/02/2008 15 Acceptable 75.1 10.9 4.3 24 82
06/24/2008 13 Acceptable 72.2 10.1 1.9 25 77
05/19/2008 20 Acceptable 60.0 6.0 1.3 36 93
09/06/2007 18 Acceptable 74.6 12.1 2.4 16 75
08/16/2007 <10 Acceptable 78.4 11.5 2.8 36 76
07/11/2007 <10 Acceptable 75.5 12.6 6.8 19 90
06/18/2007 3 Acceptable n/a n/a n/a n/a n/a
05/23/2007 6 Acceptable 63.1 4.2 1.1 81 91
04/18/2007 103 Possible Risk 43.4 0.4 0.4 95 100
12/13/2006 40 Possible Risk 45.0 2.6 1.1 12 96
11/10/2006 22 Acceptable 52.5 0.8 1.8 55 95
10/18/2006 12 Acceptable 63.3 10.2 2.5 11 82
09/26/2006 23 Acceptable 69.7 9.1 1.2 n/a 87

Rainfall data comes from wunderground.com. It is added daily to show cumulative amounts.

Acceptable Color
Enterococcus count (under 35/100ml) is acceptable by EPA standards*
Possible Risk Color
Enterococcus count (between 35 and 104/100ml), if sustained over time, would be unacceptable by EPA standards*
Unacceptable Color
Enterococcus count (over 104/100ml) is unacceptable by EPA standards*

What do the Numbers Mean?

We have based our assessment of acceptable water quality on the federal guidelines outlined in the 2000 Beaches Environmental Assessment and Coastal Health (BEACH) Act. Learn More