Water Quality
Water Quality > Tributary and Waterfront Data > Saw Mill River > Mount Pleasant- Nannyhagen Brook tributary

Mount Pleasant- Nannyhagen Brook tributary

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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

93 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
10/19/2023 121 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/05/2023 292 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/21/2023 336 Beach Advisory 0.0 0.0 0.0 1.9 1.9
09/07/2023 199 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/24/2023 670 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/24/2023 670 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/10/2023 520 Beach Advisory 0.0 0.0 0.0 1.7 1.7
07/27/2023 487 Beach Advisory 0.0 0.0 0.5 0.0 0.5
07/13/2023 1014 Beach Advisory 0.0 0.0 0.0 0.8 0.8
06/29/2023 1296 Beach Advisory 0.0 0.0 0.1 1.0 1.1
06/15/2023 2723 Beach Advisory 0.0 0.6 0.0 0.1 0.7
06/01/2023 266 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/18/2023 146 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/04/2023 231 Beach Advisory 0.0 0.0 0.0 0.3 0.3
10/27/2022 262 Beach Advisory 0.0 0.0 0.1 0.3 0.4
10/13/2022 185 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/29/2022 275 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/15/2022 1076 Beach Advisory 0.0 0.0 0.6 0.2 0.8
09/01/2022 958 Beach Advisory 0.0 0.0 0.1 0.0 0.1
08/18/2022 432 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/04/2022 414 Beach Advisory 0.0 0.0 0.0 0.4 0.4
07/21/2022 882 Beach Advisory 0.0 0.0 0.0 2.3 2.4
07/07/2022 275 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/23/2022 673 Beach Advisory 0.2 0.1 0.0 0.0 0.3
06/09/2022 >24196 Beach Advisory 1.8 0.1 0.0 0.0 1.9
05/26/2022 355 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/12/2022 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/21/2021 14136 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/07/2021 1664 Beach Advisory 0.0 0.0 0.0 0.5 0.6
09/23/2021 738 Beach Advisory 0.0 0.0 0.0 0.0 0.1
09/09/2021 5475 Beach Advisory 0.2 0.0 0.0 0.0 0.2
08/19/2021 24196 Beach Advisory 0.8 0.0 0.0 0.0 0.8
08/05/2021 414 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/22/2021 384 Beach Advisory 0.0 0.0 0.0 0.1 0.1
07/08/2021 1178 Beach Advisory 0.0 0.0 0.7 0.0 0.7
06/24/2021 1067 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/10/2021 857 Beach Advisory 0.0 0.0 0.0 0.9 0.9
05/27/2021 1043 Beach Advisory 0.1 0.0 0.0 0.0 0.1
05/13/2021 144 Beach Advisory 0.0 0.0 0.0 0.2 0.2
10/24/2019 175 Beach Advisory 0.0 0.2 0.2 0.0 0.4
10/10/2019 1014 Beach Advisory 0.0 0.3 0.1 0.2 0.6
09/26/2019 171 Beach Advisory 0.0 0.0 0.1 0.0 0.1
09/12/2019 >24196 Beach Advisory 0.1 0.0 0.0 0.0 0.1
08/15/2019 669 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/01/2019 3873 Beach Advisory 0.0 0.2 0.0 0.0 0.2
07/02/2019 327 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/20/2019 294 Beach Advisory 0.0 0.0 1.1 0.0 1.1
06/06/2019 256 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/23/2019 886 Beach Advisory 0.1 0.0 0.0 0.2 0.3
05/09/2019 10 Acceptable 0.0 0.0 0.1 0.0 0.1
10/18/2018 52 Acceptable 0.0 0.0 0.0 0.0 0.0
10/04/2018 1616 Beach Advisory 0.0 0.0 2.4 0.0 2.4
09/20/2018 441 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/06/2018 121 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/23/2018 862 Beach Advisory 0.0 0.9 0.0 0.0 0.9
08/09/2018 3654 Beach Advisory 0.0 0.3 0.6 0.0 0.9
07/26/2018 847 Beach Advisory 0.0 0.9 0.0 0.6 1.5
07/12/2018 816 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/28/2018 >24196 Beach Advisory 1.1 0.1 0.0 0.0 1.2
06/14/2018 428 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/31/2018 1130 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/17/2018 8164 Beach Advisory 0.2 0.8 0.4 0.0 1.4
10/26/2017 359 Beach Advisory 0.0 0.0 0.4 0.0 0.4
10/12/2017 651 Beach Advisory 0.1 0.0 0.0 0.2 0.3
09/28/2017 259 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/14/2017 75 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/31/2017 160 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/03/2017 14136 Beach Advisory 0.0 0.6 0.0 0.0 0.6
07/20/2017 287 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/06/2017 203 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/22/2017 404 Beach Advisory 0.0 0.0 0.0 0.9 0.9
06/08/2017 145 Beach Advisory 0.0 0.0 0.2 0.1 0.3
05/25/2017 1935 Beach Advisory 0.1 0.0 0.0 0.2 0.3
05/11/2017 10 Acceptable 0.0 0.0 0.0 0.0 0.0
10/27/2016 120 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/13/2016 150 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/29/2016 220 Beach Advisory 0.0 0.0 0.4 0.0 0.4
09/15/2016 110 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/01/2016 1190 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/18/2016 3450 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/04/2016 290 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/14/2016 5170 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/30/2016 2360 Beach Advisory 0.0 0.0 0.3 0.3 0.7
06/16/2016 590 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/02/2016 220 Beach Advisory 0.0 0.0 0.0 0.6 0.6
05/19/2016 50 Acceptable 0.0 0.0 0.0 0.0 0.0
10/08/2015 85 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/24/2015 183 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/10/2015 >24196 Beach Advisory 0.2 0.0 0.0 0.0 0.3
08/27/2015 345 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/13/2015 435 Beach Advisory 0.0 0.0 0.6 0.0 0.6
07/30/2015 471 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/16/2015 728 Beach Advisory 0.0 0.0 0.4 0.0 0.4

Entero Count (fecal indicator) and Rainfall Correlation

93 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:

The Nannyhagen Brook is the second named tributary to the Saw Mill River. The Brook flows through mostly residential areas, with less dense development in the upper watershed.

Agencies Responsible:

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

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