Water Quality > Tributary and Waterfront Data > Bronx River > Bronxville- Near Grassy Sprain Brook confluence

Bronxville- Near Grassy Sprain Brook confluence

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

17 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
10/11/2018183Beach Advisory0.
09/27/20185794Beach Advisory0.
09/13/2018287Beach Advisory0.
08/30/2018336Beach Advisory0.
08/16/2018275Beach Advisory0.
08/02/20182489Beach Advisory0.
07/19/2018520Beach Advisory0.
07/05/20186488Beach Advisory0.
06/21/2018738Beach Advisory0.
06/07/2018738Beach Advisory0.
05/24/2018122Beach Advisory0.
09/07/2017504Beach Advisory0.
07/13/2017175Beach Advisory0.
05/18/201785Beach Advisory0.

Entero Count (fecal indicator) and Rainfall Correlation

17 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

Agencies Responsible:

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

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