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

31 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.

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
10/08/2016 18 Acceptable 0.0 0.0 0.0 0.0 0.0
09/10/2016 231 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/13/2016 >2420 Beach Advisory 0.0 0.4 0.0 0.4 0.8
07/09/2016 2420 Beach Advisory 0.0 0.0 0.4 0.0 0.4
06/11/2016 >2420 Beach Advisory 0.0 0.0 0.0 0.3 0.3
05/14/2016 40 Acceptable 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 1120 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/01/2015 1120 Beach Advisory 0.0 0.0 0.7 0.0 0.7
07/04/2015 344 Beach Advisory 0.0 0.0 0.0 0.6 0.6
06/06/2015 2420 Beach Advisory 0.1 0.0 0.0 0.0 0.1
05/02/2015 5 Acceptable 0.0 0.0 0.0 0.0 0.0
10/04/2014 1733 Beach Advisory 0.8 0.0 0.0 0.0 0.8
09/06/2014 980 Beach Advisory 0.1 0.0 0.0 0.0 0.1
08/02/2014 1300 Beach Advisory 0.2 0.2 0.0 0.0 0.4
07/05/2014 1733 Beach Advisory 0.0 0.1 1.4 1.5 3.0
06/07/2014 50 Acceptable 0.0 0.0 0.5 0.2 0.6
05/03/2014 28 Acceptable 0.0 0.0 0.3 1.4 1.7
10/12/2013 131 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 >2420 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 602 Beach Advisory 0.0 0.3 0.7 0.0 1.0
05/04/2013 11 Acceptable 0.0 0.0 0.0 0.0 0.0
10/06/2012 1733 Beach Advisory 0.0 0.0 1.2 0.3 1.5
09/08/2012 1203 Beach Advisory 1.5 0.0 0.0 0.5 2.0
08/04/2012 210 Beach Advisory 0.0 0.0 0.0 0.1 0.1
07/14/2012 1733 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 6 Acceptable 0.0 0.0 0.3 0.7 1.0
11/06/2011 103 Beach Advisory 0.0 0.0 0.0 0.0 0.0

Entero Count (fecal indicator) and Rainfall Correlation

31 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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