Tappan- Oak Tree Road

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

33 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
10/08/20161553Beach Advisory0.
09/10/2016>2420Beach Advisory0.
08/13/2016>2420Beach Advisory0.
07/09/20161986Beach Advisory0.
06/11/20161046Beach Advisory0.
05/14/2016649Beach Advisory0.
10/03/2015>2420Beach Advisory0.
09/05/2015345Beach Advisory0.
08/01/2015313Beach Advisory0.
07/04/20151203Beach Advisory0.
06/06/2015>2420Beach Advisory0.
10/04/2014>2420Beach Advisory0.
09/06/2014365Beach Advisory0.
08/02/2014>2420Beach Advisory0.
07/05/2014>2420Beach Advisory0.
06/07/20141203Beach Advisory0.
05/03/2014101Beach Advisory0.
10/12/2013649Beach Advisory0.
09/14/2013>2420Beach Advisory0.
08/10/2013>2420Beach Advisory0.
07/13/2013>2420Beach Advisory0.
06/15/20131046Beach Advisory0.
10/06/2012>2420Beach Advisory0.
09/08/20121733Beach Advisory1.
08/04/20121553Beach Advisory0.
07/14/2012>2420Beach Advisory0.
06/02/2012>2420Beach Advisory0.
05/12/2012613Beach Advisory0.
09/03/2011488Beach Advisory0.
05/28/2011488Beach Advisory0.

Entero Count (fecal indicator) and Rainfall Correlation

33 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 sampling site in Tappan Memorial Park is in the midst of a residential section of the watershed. There is a small pond in the park, which is connected by a pipe to the creek. Within and shortly upstream of the park, the creek is confined on one or both banks by a masonry wall.

Agencies Responsible:

Rockland County Dept. of Health: 845-364-2900; NYSDEC Region 3: 914-428-2505

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