Water Quality > Tributary and Waterfront Data > Pocantico River > Sleepy Hollow- Gory Brook tributary

Sleepy Hollow- Gory Brook tributary

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

42 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
10/27/20181317Beach Advisory0.
09/15/2018481Beach Advisory0.
08/18/201812033Beach Advisory0.
06/16/2018613Beach Advisory0.
05/19/2018461Beach Advisory0.
10/21/2017204Beach Advisory0.
09/16/2017980Beach Advisory0.
08/19/20172420Beach Advisory0.
07/15/20171011Beach Advisory0.
06/17/20171986Beach Advisory0.
05/20/201772Beach Advisory0.
09/10/2016231Beach Advisory0.
08/13/2016>2420Beach Advisory0.
07/09/20162420Beach Advisory0.
06/11/2016>2420Beach Advisory0.
10/03/2015>2420Beach Advisory0.
09/05/20151120Beach Advisory0.
08/01/20151120Beach Advisory0.
07/04/2015344Beach Advisory0.
06/06/20152420Beach Advisory0.
10/04/20141733Beach Advisory0.
09/06/2014980Beach Advisory0.
08/02/20141300Beach Advisory0.
07/05/20141733Beach Advisory0.
10/12/2013131Beach Advisory0.
09/14/20131414Beach Advisory0.
08/10/2013>2420Beach Advisory0.
07/13/20131733Beach Advisory0.
06/15/2013602Beach Advisory0.
10/06/20121733Beach Advisory0.
09/08/20121203Beach Advisory1.
08/04/2012210Beach Advisory0.
07/14/20121733Beach Advisory0.
06/02/2012>2420Beach Advisory0.
11/06/2011103Beach Advisory0.

Entero Count (fecal indicator) and Rainfall Correlation

42 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 in Rockfeller State Park Preserve, in Gory Brook tributary just upstream of its confluence with the Pocantico River.

Agencies Responsible:

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

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