Water Quality
Water Quality > Tributary and Waterfront Data > Pocantico River > Sleepy Hollow- DEP Spillway

Sleepy Hollow- DEP Spillway

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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

46 Samples taken

Sample Date [i] Enterococcus Count
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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 Rain, day of (in) Prior Day 2 Days Prior 3 Days Prior Rain 4 Days Total Rain
Sort Sort Sort Sort Sort Sort Sort Sort
10/19/2019 388 Beach Advisory 0.0 0.0 0.0 2.9 3.0
09/21/2019 155 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/17/2019 181 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/20/2019 956 Beach Advisory 0.0 0.0 0.3 1.1 1.4
05/18/2019 41 Acceptable 0.0 0.0 0.0 0.0 0.1
10/27/2018 2603 Beach Advisory 0.3 0.0 0.0 0.0 0.3
09/15/2018 195 Beach Advisory 0.0 0.0 0.0 1.1 1.1
08/18/2018 >24196 Beach Advisory 0.5 1.4 0.0 0.0 1.9
06/16/2018 629 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/19/2018 >2420 Beach Advisory 0.2 0.0 0.3 0.9 1.4
10/21/2017 44 Acceptable 0.0 0.0 0.0 0.0 0.0
09/16/2017 866 Beach Advisory 0.0 0.0 0.4 0.0 0.5
08/19/2017 1414 Beach Advisory 0.0 0.4 0.0 0.0 0.4
07/15/2017 2420 Beach Advisory 0.0 0.5 0.4 0.0 0.8
06/17/2017 313 Beach Advisory 0.0 0.2 0.0 0.0 0.2
05/20/2017 104 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/08/2016 436 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/10/2016 2420 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/13/2016 1986 Beach Advisory 0.0 0.4 0.0 0.3 0.7
07/09/2016 1414 Beach Advisory 0.0 0.0 0.4 0.0 0.4
06/11/2016 285 Beach Advisory 0.0 0.0 0.0 0.3 0.3
05/14/2016 63 Beach Advisory 0.0 0.2 0.0 0.0 0.2
10/03/2015 >2420 Beach Advisory 0.4 0.5 0.1 1.3 2.2
09/05/2015 1986 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/01/2015 770 Beach Advisory 0.0 0.7 0.0 0.0 0.7
07/04/2015 687 Beach Advisory 0.0 0.0 0.0 0.6 0.6
06/06/2015 1733 Beach Advisory 0.1 0.0 0.0 0.0 0.1
05/02/2015 24 Acceptable 0.0 0.0 0.0 0.0 0.0
10/04/2014 >2420 Beach Advisory 0.8 0.0 0.0 0.0 0.8
09/06/2014 71 Beach Advisory 0.1 0.0 0.0 0.0 0.1
08/02/2014 326 Beach Advisory 0.2 0.2 0.0 0.0 0.4
07/05/2014 1986 Beach Advisory 0.0 0.1 1.4 1.5 3.0
06/07/2014 152 Beach Advisory 0.0 0.0 0.5 0.2 0.6
05/03/2014 60 Acceptable 0.0 0.0 0.3 1.4 1.7
10/12/2013 66 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/14/2013 1414 Beach Advisory 0.0 0.1 1.7 0.0 1.8
08/10/2013 158 Beach Advisory 0.0 0.3 0.1 0.0 0.4
07/13/2013 1733 Beach Advisory 0.0 0.1 0.0 0.2 0.4
06/15/2013 178 Beach Advisory 0.0 0.3 0.7 0.0 1.0
05/04/2013 326 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/08/2012 >2420 Beach Advisory 1.5 0.0 0.0 0.5 2.0
08/04/2012 130 Beach Advisory 0.0 0.0 0.0 0.1 0.1
07/14/2012 >2420 Beach Advisory 0.1 0.0 0.0 0.0 0.1
06/02/2012 >2420 Beach Advisory 0.9 0.0 0.0 0.0 1.0
05/12/2012 28 Acceptable 0.0 0.0 0.3 0.7 1.0
11/06/2011 167 Beach Advisory 0.0 0.0 0.0 0.0 0.0

Entero Count (fecal indicator) and Rainfall Correlation

46 Samples taken

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 citizen scientists trained by Riverkeeper, 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:

This site is located at a NYC DEP building that is part of the Croton aqueduct system. The site is near Rockefeller Brook.

Agencies Responsible:

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

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