Water Quality > Tributary and Waterfront Data > Pocantico River > Sleepy Hollow- Rockefeller Park

Sleepy Hollow- Rockefeller Park

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

38 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
SortSortSortSortSortSortSortSort
09/16/20172420Beach Advisory0.00.00.40.00.5
07/15/2017691Beach Advisory0.00.50.40.00.8
06/17/20171300Beach Advisory0.00.20.00.00.2
06/16/20172420Beach Advisory0.00.00.40.00.5
05/20/201756Acceptable0.00.00.00.00.0
10/08/201647Acceptable0.00.00.00.00.0
09/10/2016173Beach Advisory0.00.00.00.00.0
08/13/2016>2420Beach Advisory0.00.40.00.40.8
07/09/2016613Beach Advisory0.00.00.40.00.4
06/11/20161300Beach Advisory0.00.00.00.30.3
05/14/201624Acceptable0.00.20.00.00.2
10/03/2015>2420Beach Advisory0.40.50.11.32.2
09/05/2015140Beach Advisory0.00.00.00.00.0
08/01/2015135Beach Advisory0.00.00.70.00.7
07/04/2015199Beach Advisory0.00.00.00.60.6
06/06/2015613Beach Advisory0.10.00.00.00.1
05/02/20158Acceptable0.00.00.00.00.0
10/04/2014>2420Beach Advisory0.80.00.00.00.8
09/06/2014150Beach Advisory0.10.00.00.00.1
08/02/2014>2420Beach Advisory0.20.20.00.00.4
07/05/20141553Beach Advisory0.00.11.41.53.0
06/07/201413Acceptable0.00.00.50.20.6
05/03/2014162Beach Advisory0.00.00.31.41.7
10/12/2013240Beach Advisory0.00.00.00.00.0
09/14/20132420Beach Advisory0.00.11.70.01.8
08/10/20131046Beach Advisory0.00.30.10.00.4
07/13/2013299Beach Advisory0.00.10.00.20.4
06/15/20131120Beach Advisory0.00.30.70.01.0
05/04/201317Acceptable0.00.00.00.00.0
10/06/2012>2420Beach Advisory0.00.01.20.31.5
09/08/2012128Beach Advisory1.50.00.00.52.0
08/04/2012195Beach Advisory0.00.00.00.10.1
07/14/2012308Beach Advisory0.10.00.00.00.1
06/02/2012>2420Beach Advisory0.90.00.00.01.0
05/12/201224Acceptable0.00.00.30.71.0
11/06/201154Acceptable0.00.00.00.00.0
11/04/2010>2420Beach Advisory1.10.00.00.01.1
06/12/2010121Beach Advisory0.00.00.00.10.1

Entero Count (fecal indicator) and Rainfall Correlation

38 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 the southern (downstream) edge of the Rockefeller State Park Preserve, which includes over 1,400 acres of forested park land and trails.

Agencies Responsible:

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

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