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

Bronxville- Near Grassy Sprain Brook confluence

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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

39 Samples taken

Sample Date [i] Enterococcus Count
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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
10/20/2022 41 Acceptable 0.0 0.0 0.0 0.1 0.1
09/29/2022 602 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/15/2022 520 Beach Advisory 0.0 0.0 1.8 0.4 2.2
08/04/2022 273 Beach Advisory 0.0 0.0 0.0 0.4 0.4
07/21/2022 1112 Beach Advisory 0.0 0.0 0.0 3.4 3.4
07/07/2022 183 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/09/2022 24196 Beach Advisory 0.7 0.4 0.0 0.0 1.2
05/26/2022 228 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/30/2021 613 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/16/2021 414 Beach Advisory 0.0 0.0 0.1 0.0 0.1
08/19/2021 2359 Beach Advisory 0.2 0.0 0.0 0.0 0.2
08/05/2021 345 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/22/2021 256 Beach Advisory 0.0 0.0 0.0 0.0 0.1
07/08/2021 1318 Beach Advisory 0.0 0.0 0.3 0.0 0.3
06/24/2021 161 Beach Advisory 0.0 0.0 0.3 0.1 0.4
06/10/2021 703 Beach Advisory 0.0 0.0 0.7 0.4 1.0
05/27/2021 3448 Beach Advisory 0.0 0.1 0.0 0.0 0.1
10/17/2019 >24196 Beach Advisory 0.0 2.4 0.0 0.0 2.4
09/19/2019 122 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/05/2019 714 Beach Advisory 0.0 0.0 0.0 0.3 0.3
08/08/2019 1725 Beach Advisory 0.0 0.6 0.0 0.0 0.6
06/13/2019 2014 Beach Advisory 0.2 0.0 0.3 0.6 1.1
05/16/2019 119 Beach Advisory 0.1 0.1 0.1 0.8 1.0
10/11/2018 183 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/27/2018 5794 Beach Advisory 0.0 0.1 4.6 0.0 4.7
09/13/2018 287 Beach Advisory 0.0 0.1 0.0 1.1 1.2
08/30/2018 336 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/16/2018 275 Beach Advisory 0.0 0.0 0.0 0.9 0.9
08/02/2018 2489 Beach Advisory 0.0 0.6 0.0 0.0 0.6
07/19/2018 520 Beach Advisory 0.0 0.0 1.3 0.0 1.3
07/05/2018 6488 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/21/2018 12999 Beach Advisory 0.5 0.0 0.1 0.3 0.8
05/24/2018 122 Beach Advisory 0.0 0.2 0.3 0.0 0.5
10/05/2017 41 Acceptable 0.0 0.0 0.0 0.0 0.0
09/07/2017 504 Beach Advisory 0.0 0.1 0.1 0.0 0.3
08/10/2017 41 Acceptable 0.0 0.0 0.0 0.8 0.8
07/13/2017 175 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/15/2017 52 Acceptable 0.0 0.0 0.0 0.0 0.0
05/18/2017 85 Beach Advisory 0.0 0.0 0.0 0.0 0.0

Entero Count (fecal indicator) and Rainfall Correlation

39 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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