Bronx River- Mouth

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

32 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
09/13/2019 31 Acceptable 0.0 0.0 0.0 0.0 0.0
08/08/2019 141 Beach Advisory 0.0 1.0 0.0 0.0 1.1
07/19/2019 959 Beach Advisory 0.0 0.3 0.5 0.0 0.8
06/27/2019 31 Acceptable 0.0 0.0 0.2 0.0 0.2
05/22/2019 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/09/2018 84 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/19/2018 452 Beach Advisory 0.0 2.0 0.0 0.0 2.0
09/14/2018 122 Beach Advisory 0.0 0.1 0.1 0.0 0.3
08/17/2018 <10 Acceptable 0.6 0.0 0.0 0.6 1.2
07/31/2018 10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/26/2018 12,997 Acceptable 0.0 0.8 0.0 0.1 0.9
06/26/2018 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/25/2018 63 Beach Advisory 0.0 0.0 0.0 0.1 0.1
06/08/2018 10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/30/2018 74 Beach Advisory 0.0 0.0 0.0 0.5 0.5
10/09/2017 399 Beach Advisory 0.0 0.2 0.0 0.0 0.2
09/27/2017 31 Acceptable 0.0 0.0 0.0 0.0 0.0
09/15/2017 231 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/26/2017 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/09/2017 72 Beach Advisory 0.0 0.0 0.4 0.0 0.4
07/25/2017 >24196 Beach Advisory 0.0 0.9 0.1 0.5 1.5
07/20/2017 754 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/26/2017 341 Beach Advisory 0.0 0.0 1.3 0.0 1.3
06/23/2017 <10 Acceptable 0.0 0.0 0.0 0.0 0.1
06/06/2017 160 Beach Advisory 0.1 0.0 0.1 0.0 0.2
05/10/2017 10 Acceptable 0.0 0.0 0.0 0.0 0.0
11/03/2016 105 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/10/2016 >24196 Beach Advisory 0.0 0.2 0.0 0.0 0.2
08/11/2016 <10 Acceptable 0.0 0.1 0.0 0.0 0.1
08/02/2016 <10 Acceptable 0.0 1.0 1.1 0.3 2.3
07/27/2016 <10 Acceptable 0.0 0.0 0.8 0.0 0.8
07/07/2016 <10 Acceptable 0.0 0.0 0.6 0.5 1.1

Entero Count (fecal indicator) and Rainfall Correlation

32 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:

This site marks the point where the Bronx River meets the East River. It also experiences traffic from recreational boaters and kayakers. It is in the vicinity of a Combined Sewer Overflow (CSO) outfall just north in the east bank of the river.

Agencies Responsible:

NYCDEP: 212-639-9675; NYSDEC Region 2: 718-482-4933

Keep the Hudson River flowing!
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