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

Sleepy Hollow- Rockefeller 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

20 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
07/15/2017 2420 Beach Advisory 0.0 0.5 0.4 0.0 0.8
06/17/2017 2420 Beach Advisory 0.0 0.2 0.0 0.0 0.2
05/20/2017 57 Acceptable 0.0 0.0 0.0 0.0 0.0
10/08/2016 178 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 0.4 0.8
07/09/2016 2420 Beach Advisory 0.0 0.0 0.4 0.0 0.4
06/11/2016 328 Beach Advisory 0.0 0.0 0.0 0.3 0.3
05/14/2016 32 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 50 Acceptable 0.0 0.0 0.0 0.0 0.0
08/01/2015 575 Beach Advisory 0.0 0.0 0.7 0.0 0.7
07/04/2015 613 Beach Advisory 0.0 0.0 0.0 0.6 0.6
06/06/2015 488 Beach Advisory 0.1 0.0 0.0 0.0 0.1
05/02/2015 20 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 517 Beach Advisory 0.1 0.0 0.0 0.0 0.1
08/02/2014 921 Beach Advisory 0.2 0.2 0.0 0.0 0.4
07/05/2014 2420 Beach Advisory 0.0 0.1 1.4 1.5 3.0
06/07/2014 281 Beach Advisory 0.0 0.0 0.5 0.2 0.6

Entero Count (fecal indicator) and Rainfall Correlation

20 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:

The Rockefeller Brook rises from three small ponds and flows through a mostly forested and agricultural area before joining the Pocantico River in the Rockefeller State Park Preserve.

Agencies Responsible:

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

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