Water Quality > Tributary and Waterfront Data > Saw Mill River > Yonkers- JFK Marina boat launch

Yonkers- JFK Marina boat launch

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

107 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
SortSortSortSortSortSortSortSort
10/12/201710Acceptable0.20.00.00.20.4
09/28/2017<10Acceptable0.00.00.00.00.0
09/14/2017<10Acceptable0.00.00.00.00.0
08/03/201710Acceptable0.00.30.00.00.3
07/20/2017<10Acceptable0.00.00.00.00.0
06/22/201752Acceptable0.00.00.00.00.0
06/08/201752Acceptable0.00.00.00.00.0
05/11/201741Acceptable0.00.00.00.00.0
10/27/201630Acceptable0.10.00.00.10.1
10/13/201690Beach Advisory0.00.00.00.00.0
09/29/20162190Beach Advisory0.00.00.30.00.3
09/22/2016<10Acceptable0.00.00.00.50.5
09/15/2016160Beach Advisory0.00.00.00.00.0
09/08/201620Acceptable0.00.00.00.00.0
09/01/2016100Beach Advisory0.10.00.00.00.1
08/25/2016<10Acceptable0.00.00.00.00.0
08/18/201640Acceptable0.00.10.90.00.9
08/11/2016<10Acceptable0.00.50.00.00.5
08/04/201610Acceptable0.00.00.00.00.0
07/28/201610Acceptable0.00.00.00.20.2
07/21/201631Acceptable0.00.00.00.10.1
07/14/201630Acceptable0.20.00.00.00.2
07/07/201651Acceptable0.00.00.70.10.8
06/30/2016120Beach Advisory0.00.00.50.30.8
06/23/2016241Beach Advisory0.00.00.00.00.0
06/16/2016110Beach Advisory0.10.00.00.00.1
06/09/2016336Beach Advisory1.00.40.00.01.3
05/26/201610Acceptable0.00.00.30.10.4
05/19/201620Acceptable0.00.00.00.00.0
10/08/2015169Beach Advisory0.00.00.00.00.0
10/01/20152489Beach Advisory0.11.00.00.01.1
09/24/2015<10Acceptable0.00.00.00.00.0
09/17/201541Acceptable0.50.00.00.00.5
09/10/201575Beach Advisory0.40.00.00.00.4
09/03/2015122Beach Advisory0.00.00.00.00.0
08/27/201574Beach Advisory0.00.00.00.00.0
08/20/2015269Beach Advisory0.00.00.00.00.0
08/13/201597Beach Advisory0.00.00.00.00.0
08/06/201575Beach Advisory0.00.00.00.00.0
07/30/201541Acceptable0.00.00.10.00.1
07/23/2015121Beach Advisory0.00.00.10.00.1
07/16/2015292Beach Advisory0.00.00.00.00.0
07/09/2015738Beach Advisory0.00.40.00.00.4
07/01/2015184Beach Advisory0.10.00.00.40.5
06/25/201510Acceptable0.00.00.00.00.0
06/18/201551Acceptable0.00.00.30.50.8
06/11/201531Acceptable0.00.00.20.30.5
06/04/2015110Beach Advisory0.00.00.40.71.2
05/21/201531Acceptable0.00.00.00.00.0
10/02/201420Acceptable0.00.00.00.00.0
09/18/201420Acceptable0.00.00.40.00.4
09/11/201410Acceptable0.00.00.00.00.0
09/04/201430Acceptable0.00.00.00.00.0
08/28/201452Acceptable0.00.00.00.00.0
08/21/2014<10Acceptable0.40.00.00.00.4
08/14/201463Beach Advisory0.00.50.20.00.7
08/07/2014122Beach Advisory0.00.00.00.00.0
07/31/201410Acceptable0.00.00.00.20.2
07/24/2014631Beach Advisory0.00.20.00.00.2
07/17/201452Acceptable0.00.01.30.51.8
07/10/2014262Beach Advisory0.10.40.00.00.5
07/02/201452Acceptable1.00.00.00.01.0
06/26/201485Beach Advisory0.10.10.00.00.2
06/19/2014657Beach Advisory0.20.00.00.00.2
06/12/2014395Beach Advisory0.10.00.01.61.7
06/05/20146488Beach Advisory0.90.00.10.01.0
05/29/201452Acceptable0.00.00.00.00.0
05/22/2014530Beach Advisory0.20.00.00.00.2
10/03/201361Beach Advisory0.00.00.00.00.0
09/26/201320Acceptable0.00.00.00.00.0
09/19/201386Beach Advisory0.00.00.00.00.0
09/12/2013<10Acceptable1.60.00.00.01.6
08/29/2013158Beach Advisory0.00.40.00.00.5
08/22/201310Acceptable0.30.00.00.00.3
08/15/2013121Beach Advisory0.00.00.90.10.9
08/08/201397Beach Advisory0.50.00.00.00.5
08/01/201310Acceptable0.70.00.00.00.7
07/25/2013820Beach Advisory0.00.00.30.10.4
07/18/2013<10Acceptable0.00.00.00.00.0
07/11/201320Acceptable0.00.00.20.20.5
07/02/2013512Beach Advisory0.10.80.00.00.9
06/27/201374Beach Advisory0.20.10.00.00.3
06/20/201320Acceptable0.00.00.20.00.2
06/13/201330Acceptable1.30.00.11.42.7
06/06/201341Acceptable0.10.00.00.91.0
05/23/201310Acceptable1.80.00.00.01.8
09/27/2012<10Acceptable0.10.00.00.00.1
09/20/20122909Beach Advisory0.00.01.50.01.5
09/13/2012121Beach Advisory0.00.00.00.00.0
09/06/201210Acceptable0.00.10.10.00.2
08/30/201241Acceptable0.00.00.10.60.8
08/23/201220Acceptable0.00.00.00.00.0
08/16/201275Beach Advisory0.00.60.00.00.6
08/09/2012<10Acceptable0.00.00.00.00.0
07/26/201210Acceptable0.60.00.00.20.8
07/19/2012520Beach Advisory0.01.80.00.01.8
07/12/2012<10Acceptable0.00.00.00.00.0
07/05/201210Acceptable0.00.10.00.00.1
06/07/2012<10Acceptable0.00.00.00.20.2
05/31/2012146Beach Advisory0.00.00.20.00.2
05/24/201220Acceptable1.00.00.21.42.6
05/17/2012<10Acceptable0.00.10.50.00.6
12/01/201168Beach Advisory0.00.00.50.00.5
11/21/201160Acceptable0.10.00.00.00.1
11/17/20115Acceptable0.70.70.00.01.4
11/09/2011293Beach Advisory0.00.00.00.00.0
10/27/2011<1Acceptable0.60.00.00.00.6

Entero Count (fecal indicator) and Rainfall Correlation

107 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 marina and public launch at the north end of Yonkers is used by the Yonkers Paddling & Rowing Club for occasional public programming. Partners: Jerry Blackstone (sponsor), Yonkers Paddling & Rowing Club, Sarah Lawrence College Center for the Urban River at Beczak (lab analysis); Site Coordinators: Jerry Blackstone and Robert Hothan

Agencies Responsible:

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

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