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

Yonkers- JFK Marina boat launch

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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

146 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
07/25/2024 <10 Acceptable 0.0 0.1 0.3 0.0 0.3
07/11/2024 40 Acceptable 0.0 0.0 0.0 0.0 0.0
06/27/2024 41 Acceptable 0.4 0.0 0.0 0.0 0.4
06/13/2024 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/30/2024 631 Beach Advisory 1.2 0.0 0.2 0.3 1.6
05/16/2024 41 Acceptable 0.0 0.2 0.0 0.0 0.3
05/02/2024 <10 Acceptable 0.0 0.1 0.0 0.0 0.1
10/19/2023 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/05/2023 74 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/21/2023 10 Acceptable 0.0 0.0 0.5 0.8 1.3
09/07/2023 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/10/2023 10 Acceptable 0.0 0.0 0.2 0.7 0.9
07/27/2023 20 Acceptable 0.0 0.0 0.7 0.0 0.7
07/13/2023 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/29/2023 30 Acceptable 0.0 0.0 0.1 0.5 0.6
06/15/2023 301 Beach Advisory 0.0 0.2 0.0 0.1 0.3
06/01/2023 20 Acceptable 0.0 0.0 0.0 0.0 0.0
05/18/2023 <10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/04/2023 52 Acceptable 0.1 0.0 0.0 0.0 0.1
10/27/2022 10 Acceptable 0.0 0.0 0.1 0.5 0.5
10/13/2022 10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/15/2022 120 Beach Advisory 0.0 0.0 0.6 0.2 0.8
09/01/2022 20 Acceptable 0.0 0.0 0.1 0.0 0.1
08/04/2022 20 Acceptable 0.0 0.0 0.0 0.2 0.2
07/21/2022 41 Acceptable 0.0 0.0 0.0 4.8 4.8
10/21/2021 189 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/07/2021 158 Beach Advisory 0.0 0.0 0.2 0.5 0.7
09/23/2021 62 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/09/2021 52 Acceptable 0.4 0.0 0.0 0.0 0.4
07/22/2021 75 Beach Advisory 0.0 0.0 0.0 0.0 0.1
07/08/2021 368 Beach Advisory 0.0 0.0 0.3 0.0 0.3
06/24/2021 52 Acceptable 0.0 0.0 0.3 0.0 0.3
06/10/2021 168 Beach Advisory 0.0 0.0 0.8 0.3 1.1
05/27/2021 31 Acceptable 0.1 0.0 0.0 0.0 0.1
10/24/2019 20 Acceptable 0.0 0.0 0.5 0.0 0.5
10/10/2019 1100 Beach Advisory 0.0 1.0 0.1 0.8 1.8
09/12/2019 41 Acceptable 0.0 0.0 0.0 0.0 0.0
08/15/2019 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/01/2019 86 Beach Advisory 0.0 1.0 0.0 0.0 1.0
06/20/2019 10 Acceptable 0.0 0.0 0.3 0.0 0.4
06/06/2019 10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/23/2019 20 Acceptable 0.1 0.0 0.0 0.2 0.3
05/09/2019 20 Acceptable 0.0 0.0 0.1 0.0 0.1
10/04/2018 62 Beach Advisory 0.0 0.0 0.8 0.0 0.8
09/06/2018 10 Acceptable 0.0 0.0 0.0 0.0 0.0
08/23/2018 20 Acceptable 0.0 1.0 0.0 0.0 1.0
08/09/2018 84 Beach Advisory 0.4 0.0 0.2 0.0 0.6
07/26/2018 3968 Beach Advisory 0.1 1.0 0.0 0.3 1.4
07/12/2018 10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/28/2018 393 Beach Advisory 0.8 0.0 0.0 0.0 0.8
06/14/2018 663 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/31/2018 10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/17/2018 41 Acceptable 0.2 1.0 0.4 0.0 1.7
10/26/2017 41 Acceptable 0.0 0.0 0.2 0.0 0.2
10/12/2017 10 Acceptable 0.2 0.0 0.0 0.2 0.4
08/03/2017 10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/22/2017 52 Acceptable 0.0 0.0 0.0 0.0 0.0
06/08/2017 52 Acceptable 0.0 0.0 0.0 0.0 0.0
05/25/2017 241 Beach Advisory 0.4 0.0 0.0 0.5 0.9
05/11/2017 41 Acceptable 0.0 0.0 0.0 0.0 0.0
10/27/2016 30 Acceptable 0.1 0.0 0.0 0.2 0.2
10/13/2016 90 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/29/2016 2190 Beach Advisory 0.0 0.0 0.3 0.0 0.3
09/15/2016 160 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/08/2016 20 Acceptable 0.0 0.0 0.0 0.0 0.0
09/01/2016 100 Beach Advisory 0.1 0.0 0.0 0.0 0.1
08/18/2016 40 Acceptable 0.0 0.0 0.9 0.0 0.9
08/04/2016 10 Acceptable 0.0 0.0 0.0 0.0 0.0
07/28/2016 10 Acceptable 0.0 0.0 0.0 0.2 0.2
07/21/2016 31 Acceptable 0.0 0.0 0.0 0.1 0.1
07/14/2016 30 Acceptable 0.2 0.0 0.0 0.0 0.2
07/07/2016 51 Acceptable 0.0 0.0 0.7 0.1 0.8
06/30/2016 120 Beach Advisory 0.0 0.0 0.5 0.3 0.7
06/23/2016 241 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/16/2016 110 Beach Advisory 0.1 0.0 0.0 0.0 0.1
06/09/2016 336 Beach Advisory 1.0 0.0 0.0 0.0 1.0
05/26/2016 10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/19/2016 20 Acceptable 0.0 0.0 0.0 0.0 0.0
10/08/2015 169 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/01/2015 2489 Beach Advisory 0.0 1.0 0.0 0.0 1.0
09/17/2015 41 Acceptable 0.0 0.0 0.0 0.0 0.0
09/10/2015 75 Beach Advisory 0.9 0.0 0.0 0.0 0.9
09/03/2015 122 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/27/2015 74 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/20/2015 269 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/13/2015 97 Beach Advisory 0.0 0.0 0.7 0.0 0.7
08/06/2015 75 Beach Advisory 0.0 0.0 0.1 0.0 0.1
07/30/2015 41 Acceptable 0.0 0.0 0.0 0.0 0.0
07/23/2015 121 Beach Advisory 0.0 0.0 0.1 0.0 0.1
07/16/2015 292 Beach Advisory 0.0 0.0 1.5 0.0 1.5
07/09/2015 738 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/01/2015 184 Beach Advisory 0.5 0.0 0.0 0.3 0.9
06/25/2015 10 Acceptable 0.0 0.0 0.0 0.0 0.0
06/18/2015 51 Acceptable 0.0 0.0 0.1 0.2 0.4
06/11/2015 31 Acceptable 0.0 0.0 0.0 0.0 0.0
06/04/2015 110 Beach Advisory 0.0 0.0 0.0 0.2 0.2
05/21/2015 31 Acceptable 0.0 0.0 0.1 0.0 0.1
10/02/2014 20 Acceptable 0.0 0.0 0.0 0.0 0.0
09/18/2014 20 Acceptable 0.0 0.0 0.4 0.0 0.4
09/11/2014 10 Acceptable 0.0 0.0 0.0 0.0 0.0
09/04/2014 30 Acceptable 0.0 0.0 0.0 0.0 0.0
08/28/2014 52 Acceptable 0.0 0.0 0.0 0.0 0.0
08/14/2014 63 Beach Advisory 0.0 1.0 0.2 0.0 1.2
08/07/2014 122 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/31/2014 10 Acceptable 0.0 0.0 0.0 0.2 0.2
07/24/2014 631 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/17/2014 52 Acceptable 0.0 0.0 1.3 0.5 1.8
07/10/2014 262 Beach Advisory 0.0 0.0 0.4 0.0 0.4
07/02/2014 52 Acceptable 1.0 0.0 0.0 0.0 1.0
06/26/2014 85 Beach Advisory 0.1 0.0 0.0 0.0 0.1
06/19/2014 657 Beach Advisory 0.2 0.0 0.0 0.0 0.2
06/12/2014 395 Beach Advisory 0.1 0.0 0.0 1.6 1.7
06/05/2014 6488 Beach Advisory 0.9 0.0 0.1 0.0 1.0
05/29/2014 52 Acceptable 0.0 0.0 0.0 0.0 0.0
05/22/2014 530 Beach Advisory 0.2 0.0 0.0 0.0 0.2
10/03/2013 61 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/26/2013 20 Acceptable 0.0 0.0 0.0 0.0 0.0
09/19/2013 86 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/29/2013 158 Beach Advisory 0.0 0.0 0.0 0.0 0.1
08/22/2013 10 Acceptable 0.3 0.0 0.0 0.0 0.3
08/15/2013 121 Beach Advisory 0.0 0.0 0.9 0.1 0.9
08/08/2013 97 Beach Advisory 0.5 0.0 0.0 0.0 0.5
08/01/2013 10 Acceptable 0.7 0.0 0.0 0.0 0.7
07/25/2013 820 Beach Advisory 0.0 0.0 0.3 0.1 0.4
07/11/2013 20 Acceptable 0.0 0.0 0.2 0.2 0.5
07/02/2013 512 Beach Advisory 0.1 1.0 0.0 0.0 1.1
06/27/2013 74 Beach Advisory 0.2 0.0 0.0 0.0 0.2
06/20/2013 20 Acceptable 0.0 0.0 0.2 0.0 0.2
06/13/2013 30 Acceptable 1.3 0.0 0.1 1.4 2.7
06/06/2013 41 Acceptable 0.1 0.0 0.0 0.9 1.0
05/23/2013 10 Acceptable 1.8 0.0 0.0 0.0 1.8
09/20/2012 2909 Beach Advisory 0.0 0.0 1.5 0.0 1.5
09/13/2012 121 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/06/2012 10 Acceptable 0.0 0.0 0.1 0.0 0.1
08/30/2012 41 Acceptable 0.0 0.0 0.1 0.6 0.8
08/23/2012 20 Acceptable 0.0 0.0 0.0 0.0 0.0
08/16/2012 75 Beach Advisory 0.0 1.0 0.0 0.0 1.0
07/26/2012 10 Acceptable 0.6 0.0 0.0 0.2 0.8
07/19/2012 520 Beach Advisory 0.0 2.0 0.0 0.0 2.0
07/05/2012 10 Acceptable 0.0 0.0 0.0 0.0 0.0
05/31/2012 146 Beach Advisory 0.0 0.0 0.2 0.0 0.2
05/24/2012 20 Acceptable 1.0 0.0 0.2 1.4 2.6
12/01/2011 68 Beach Advisory 0.0 0.0 0.5 0.0 0.5
11/21/2011 60 Acceptable 0.1 0.0 0.0 0.0 0.1
11/17/2011 5 Acceptable 0.7 1.0 0.0 0.0 1.7
11/09/2011 293 Beach Advisory 0.0 0.0 0.0 0.0 0.0

Entero Count (fecal indicator) and Rainfall Correlation

146 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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