Water Quality
Water Quality > Tributary and Waterfront Data > Saw Mill River > Yonkers- Hearst Street

Yonkers- Hearst Street

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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

91 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
09/05/2024 85 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/22/2024 199 Beach Advisory 0.0 0.0 0.0 2.2 2.2
08/08/2024 985 Beach Advisory 0.1 2.1 0.0 0.2 2.3
07/25/2024 160 Beach Advisory 0.0 0.1 0.3 0.0 0.3
07/11/2024 158 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/13/2024 96 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/30/2024 >24196 Beach Advisory 1.2 0.0 0.2 0.3 1.6
05/16/2024 8164 Beach Advisory 0.0 0.2 0.0 0.0 0.3
05/02/2024 20 Acceptable 0.0 0.1 0.0 0.0 0.1
10/05/2023 266 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/21/2023 183 Beach Advisory 0.0 0.0 0.5 0.8 1.3
09/07/2023 52 Acceptable 0.0 0.0 0.0 0.0 0.0
08/24/2023 132 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/10/2023 97 Beach Advisory 0.0 0.0 0.2 0.7 0.9
07/27/2023 860 Beach Advisory 0.0 0.0 0.7 0.0 0.7
07/13/2023 408 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/29/2023 798 Beach Advisory 0.0 0.0 0.1 0.5 0.6
06/15/2023 5012 Beach Advisory 0.0 0.2 0.0 0.1 0.3
06/01/2023 148 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/18/2023 20 Acceptable 0.0 0.0 0.0 0.0 0.0
05/04/2023 359 Beach Advisory 0.1 0.0 0.0 0.0 0.1
10/27/2022 63 Beach Advisory 0.0 0.0 0.1 0.5 0.5
10/13/2022 75 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/29/2022 63 Beach Advisory 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
08/18/2022 122 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/04/2022 185 Beach Advisory 0.0 0.0 0.0 0.2 0.2
07/21/2022 1039 Beach Advisory 0.0 0.0 0.0 4.8 4.8
10/21/2021 63 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/07/2021 121 Beach Advisory 0.0 0.0 0.2 0.5 0.7
09/23/2021 171 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/09/2021 5475 Beach Advisory 0.4 0.0 0.0 0.0 0.4
08/19/2021 4611 Beach Advisory 0.2 0.0 0.0 0.0 0.2
08/05/2021 120 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/22/2021 173 Beach Advisory 0.0 0.0 0.0 0.0 0.1
07/08/2021 256 Beach Advisory 0.0 0.0 0.3 0.0 0.3
06/24/2021 228 Beach Advisory 0.0 0.0 0.3 0.0 0.3
06/10/2021 855 Beach Advisory 0.0 0.0 0.8 0.3 1.1
05/13/2021 97 Beach Advisory 0.0 0.0 0.0 0.1 0.1
10/24/2019 292 Beach Advisory 0.0 0.0 0.5 0.0 0.5
10/10/2019 332 Beach Advisory 0.0 1.0 0.1 0.8 1.8
09/26/2019 238 Beach Advisory 0.0 0.0 0.0 0.0 0.1
09/12/2019 213 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/15/2019 1455 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/01/2019 9804 Beach Advisory 0.0 1.0 0.0 0.0 1.0
07/02/2019 63 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/20/2019 473 Beach Advisory 0.0 0.0 0.3 0.0 0.4
06/06/2019 121 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/23/2019 318 Beach Advisory 0.1 0.0 0.0 0.2 0.3
05/09/2019 130 Beach Advisory 0.0 0.0 0.1 0.0 0.1
10/18/2018 97 Beach Advisory 0.0 0.0 0.1 0.1 0.1
10/04/2018 3076 Beach Advisory 0.0 0.0 0.8 0.0 0.8
09/20/2018 537 Beach Advisory 0.0 0.0 1.1 0.0 1.1
09/06/2018 63 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/23/2018 1674 Beach Advisory 0.0 1.0 0.0 0.0 1.0
08/09/2018 3448 Beach Advisory 0.4 0.0 0.2 0.0 0.6
07/26/2018 3448 Beach Advisory 0.1 1.0 0.0 0.3 1.4
07/12/2018 235 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/28/2018 24196 Beach Advisory 0.8 0.0 0.0 0.0 0.8
06/14/2018 97 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/31/2018 181 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/26/2017 226 Beach Advisory 0.0 0.0 0.2 0.0 0.2
10/12/2017 383 Beach Advisory 0.2 0.0 0.0 0.2 0.4
09/28/2017 74 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/14/2017 52 Acceptable 0.0 0.0 0.0 0.0 0.0
08/31/2017 84 Beach Advisory 0.0 0.0 0.2 0.0 0.2
08/03/2017 4611 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/20/2017 51 Acceptable 0.0 0.0 0.0 0.0 0.0
07/06/2017 156 Beach Advisory 0.0 0.0 0.1 0.0 0.1
06/22/2017 233 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/08/2017 155 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/25/2017 6131 Beach Advisory 0.4 0.0 0.0 0.5 0.9
05/11/2017 96 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/27/2016 120 Beach Advisory 0.0 0.0 0.0 0.1 0.1
10/13/2016 120 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/29/2016 50 Acceptable 0.0 0.0 0.3 0.0 0.3
09/15/2016 40 Acceptable 0.0 0.0 0.0 0.0 0.0
09/01/2016 230 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/18/2016 100 Beach Advisory 0.0 0.0 0.9 0.0 0.9
08/04/2016 140 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/14/2016 2720 Beach Advisory 0.2 0.0 0.0 0.0 0.2
06/30/2016 380 Beach Advisory 0.0 0.0 0.5 0.3 0.7
06/16/2016 280 Beach Advisory 0.1 0.0 0.0 0.0 0.1
06/02/2016 160 Beach Advisory 0.0 0.0 0.0 1.1 1.1
05/19/2016 50 Acceptable 0.0 0.0 0.0 0.0 0.0
10/08/2015 266 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/24/2015 109 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/27/2015 327 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/13/2015 567 Beach Advisory 0.0 0.0 0.7 0.0 0.7
07/30/2015 1034 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/16/2015 473 Beach Advisory 0.0 0.0 1.5 0.0 1.5

Entero Count (fecal indicator) and Rainfall Correlation

91 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 sampling site is located approximately one mile upstream of the channelized former industrial area at the outskirts of downtown Yonkers. Near this location, residential development becomes more dense, as the river flows into Yonkers.

Agencies Responsible:

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

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