Water Quality > Tributary and Waterfront Data > Saw Mill River > Mount Pleasant- Nannyhagen Brook tributary

Mount Pleasant- Nannyhagen 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

42 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
10/04/20181616Beach Advisory0.
09/20/2018441Beach Advisory0.
09/06/2018121Beach Advisory0.
08/23/2018862Beach Advisory0.
08/09/20183654Beach Advisory0.
07/26/2018847Beach Advisory0.
07/12/2018816Beach Advisory0.
06/28/2018>24196Beach Advisory1.
06/14/2018428Beach Advisory0.
05/31/20181130Beach Advisory0.
10/26/2017359Beach Advisory0.
10/12/2017651Beach Advisory0.
09/28/2017259Beach Advisory0.
09/14/201775Beach Advisory0.
08/31/2017160Beach Advisory0.
08/03/201714136Beach Advisory0.
07/20/2017287Beach Advisory0.
07/06/2017203Beach Advisory0.
06/22/2017404Beach Advisory0.
06/08/2017145Beach Advisory0.
05/25/20171935Beach Advisory0.
10/27/2016120Beach Advisory0.
10/13/2016150Beach Advisory0.
09/29/2016220Beach Advisory0.
09/15/2016110Beach Advisory0.
09/01/20161190Beach Advisory0.
08/18/20163450Beach Advisory0.
08/04/2016290Beach Advisory0.
07/14/20165170Beach Advisory0.
06/30/20162360Beach Advisory0.
06/16/2016590Beach Advisory0.
06/02/2016220Beach Advisory0.
10/08/201585Beach Advisory0.
09/24/2015183Beach Advisory0.
09/10/2015>24196Beach Advisory0.
08/27/2015345Beach Advisory0.
08/13/2015435Beach Advisory0.
07/30/2015471Beach Advisory0.
07/16/2015728Beach Advisory0.

Entero Count (fecal indicator) and Rainfall Correlation

42 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 and processed at laboratories that aren't directly affiliated with Riverkeeper, using methods and study designs that are consistent with Riverkeeper's Hudson River and Citizen Testing programs.

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 Nannyhagen Brook is the second named tributary to the Saw Mill River. The Brook flows through mostly residential areas, with less dense development in the upper watershed.

Agencies Responsible:

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

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