Water Quality
Water Quality > Pocantico River > Sleepy Hollow- Gory Brook tributary

Sleepy Hollow- Gory Brook tributary

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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

61 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
09/19/2024 355 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/22/2024 1951 Beach Advisory 0.0 0.0 0.0 0.1 0.1
06/13/2024 324 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/16/2024 1785 Beach Advisory 0.2 0.3 0.1 0.0 0.5
10/19/2023 10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/21/2023 209 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/24/2023 465 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/27/2023 1160 Beach Advisory 0.0 0.0 0.4 0.0 0.4
06/15/2023 6867 Beach Advisory 0.0 0.6 0.0 0.1 0.7
05/18/2023 41 Acceptable 0.0 0.0 0.0 0.0 0.0
10/20/2022 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/18/2022 160 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/22/2022 728 Beach Advisory 0.0 0.3 0.0 0.0 0.3
10/21/2021 73 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/23/2021 193 Beach Advisory 0.0 0.0 0.0 0.0 0.1
07/15/2021 563 Beach Advisory 0.0 0.0 0.0 0.2 0.2
06/17/2021 122 Beach Advisory 0.0 0.0 0.0 0.1 0.1
05/20/2021 63 Beach Advisory 0.0 0.0 0.0 0.2 0.2
10/19/2019 798 Beach Advisory 0.0 0.0 0.0 2.9 3.0
09/21/2019 118 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/17/2019 985 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/20/2019 1374 Beach Advisory 0.0 0.0 0.3 1.1 1.4
06/15/2019 107 Beach Advisory 0.0 0.0 0.7 0.0 0.7
05/18/2019 31 Acceptable 0.0 0.0 0.0 0.0 0.1
10/27/2018 1317 Beach Advisory 0.2 0.0 0.0 0.0 0.2
09/15/2018 481 Beach Advisory 0.0 0.0 0.0 1.1 1.1
08/18/2018 12033 Beach Advisory 0.5 1.4 0.0 0.0 1.9
06/16/2018 613 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/19/2018 461 Beach Advisory 0.2 0.0 0.3 0.9 1.4
10/21/2017 204 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/16/2017 980 Beach Advisory 0.0 0.0 0.4 0.0 0.5
08/19/2017 2420 Beach Advisory 0.0 0.4 0.0 0.0 0.4
07/15/2017 1011 Beach Advisory 0.0 0.5 0.4 0.0 0.8
06/17/2017 1986 Beach Advisory 0.0 0.2 0.0 0.0 0.2
05/20/2017 72 Beach Advisory 0.0 0.0 0.0 0.0 0.0
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
07/09/2016 2420 Beach Advisory 0.0 0.0 0.4 0.0 0.4
05/14/2016 40 Acceptable 0.0 0.2 0.0 0.0 0.2
09/05/2015 1120 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/01/2015 1120 Beach Advisory 0.0 0.7 0.0 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
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
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

61 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