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.

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 1553 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/10/2016 >2420 Beach Advisory 0.0 0.2 0.0 0.0 0.3
08/13/2016 >2420 Beach Advisory 0.0 0.6 0.1 0.1 0.8
07/09/2016 1986 Beach Advisory 0.0 0.0 0.4 0.0 0.4
06/11/2016 1046 Beach Advisory 0.0 0.0 0.0 0.3 0.3
05/14/2016 649 Beach Advisory 0.0 0.2 0.0 0.0 0.2
10/03/2015 >2420 Beach Advisory 0.2 0.2 0.1 1.2 1.8
09/05/2015 345 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/01/2015 313 Beach Advisory 0.0 0.0 1.5 0.0 1.5
07/04/2015 1203 Beach Advisory 0.0 0.0 0.0 1.1 1.1
06/06/2015 >2420 Beach Advisory 0.4 0.0 0.0 0.0 0.4
05/02/2015 16 Acceptable 0.0 0.0 0.0 0.0 0.0
10/04/2014 >2420 Beach Advisory 0.2 0.0 0.0 0.0 0.2
09/06/2014 365 Beach Advisory 0.9 0.0 0.0 0.0 0.9
08/02/2014 >2420 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/05/2014 >2420 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/07/2014 1203 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/03/2014 101 Beach Advisory 0.0 0.0 0.4 3.0 3.4
10/12/2013 649 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/14/2013 >2420 Beach Advisory 0.0 2.1 2.0 0.0 4.2
08/10/2013 >2420 Beach Advisory 0.1 0.6 0.3 0.0 0.9
07/13/2013 >2420 Beach Advisory 0.3 0.1 0.1 0.1 0.6
06/15/2013 1046 Beach Advisory 0.0 0.6 0.6 0.1 1.3
05/04/2013 29 Acceptable 0.0 0.0 0.0 0.0 0.0
10/06/2012 >2420 Beach Advisory 0.0 0.0 1.0 0.4 1.4
09/08/2012 1733 Beach Advisory 1.0 0.0 0.1 0.4 1.5
08/04/2012 1553 Beach Advisory 0.0 0.0 0.0 0.1 0.1
07/14/2012 >2420 Beach Advisory 0.1 0.0 0.0 0.0 0.1
06/02/2012 >2420 Beach Advisory 0.7 0.0 0.0 0.0 0.7
05/12/2012 613 Beach Advisory 0.0 0.4 0.3 0.2 0.9
11/06/2011 58 Acceptable 0.0 0.0 0.0 0.0 0.0
09/03/2011 488 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/28/2011 488 Beach Advisory 0.0 0.0 0.0 0.0 0.0

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

2017 Fishermen's Ball
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