Water Quality
Water Quality > Hudson River Estuary Data > Albany County & Rensselaer County Sites > Hudson above Troy Lock

Hudson above Troy Lock

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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

96 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
08/24/2023 70 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/20/2023 1300 Beach Advisory 0.0 0.0 0.9 0.0 0.9
06/29/2023 231 Beach Advisory 0.0 0.1 0.2 1.2 1.6
05/04/2023 124 Beach Advisory 0.0 0.2 0.0 0.7 1.0
10/13/2022 1733 Beach Advisory 0.0 0.0 0.0 0.0 0.0
09/13/2022 921 Beach Advisory 0.1 0.0 0.0 0.0 0.1
08/22/2022 285 Beach Advisory 0.0 0.0 0.0 0.1 0.1
07/18/2022 134 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/16/2022 144 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/26/2022 126 Beach Advisory 0.0 0.0 0.0 0.8 0.8
10/28/2021 2420 Beach Advisory 0.0 0.0 1.0 0.9 1.9
09/16/2021 1733 Beach Advisory 0.2 0.8 0.0 0.8 1.8
08/19/2021 1203 Beach Advisory 0.5 0.0 0.0 0.0 0.5
07/22/2021 1986 Beach Advisory 0.0 0.5 0.3 0.1 0.9
06/10/2021 184 Beach Advisory 0.0 0.0 0.6 0.0 0.6
05/20/2021 16 Acceptable 0.0 0.0 0.0 0.0 0.0
10/17/2020 84 Beach Advisory 0.0 0.6 0.0 0.0 0.6
09/21/2020 44 Acceptable 0.0 0.0 0.0 0.0 0.0
08/17/2020 516 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/17/2020 870 Beach Advisory 0.4 0.1 0.0 0.1 0.5
06/19/2020 228 Beach Advisory 0.0 0.0 0.0 0.0 0.0
05/29/2020 411 Beach Advisory 0.5 0.0 0.0 0.0 0.5
10/11/2019 457 Beach Advisory 0.0 0.0 0.0 0.1 0.1
09/13/2019 866 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/09/2019 >2420 Beach Advisory 0.0 0.8 0.1 0.4 1.3
07/12/2019 172 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/08/2019 35 Acceptable 0.0 0.0 0.6 0.5 1.1
05/11/2019 46 Acceptable 0.0 0.2 0.0 0.0 0.2
10/13/2018 >2420 Beach Advisory 0.3 0.0 1.3 0.0 1.6
09/13/2018 44 Acceptable 0.0 0.1 0.1 0.9 1.1
08/17/2018 388 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/20/2018 345 Beach Advisory 0.0 0.0 0.0 0.4 0.4
06/16/2018 72 Beach Advisory 0.0 0.1 0.0 0.3 0.3
05/09/2018 17 Acceptable 0.0 0.0 0.0 0.3 0.3
10/19/2017 50 Acceptable 0.0 0.0 0.0 0.0 0.0
09/14/2017 122 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/17/2017 435 Beach Advisory 0.0 0.0 0.0 0.0 0.0
07/13/2017 33 Acceptable 0.2 0.1 0.1 0.0 0.3
06/15/2017 31 Acceptable 0.0 0.0 0.0 0.0 0.0
05/18/2017 3 Acceptable 0.0 0.0 0.0 0.3 0.3
04/07/2017 93 Beach Advisory 0.0 0.5 0.0 0.9 1.4
10/18/2016 51 Acceptable 0.0 0.0 0.0 0.0 0.0
09/17/2016 272 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/18/2016 211 Beach Advisory 0.0 0.0 0.2 0.0 0.2
07/16/2016 22 Acceptable 0.0 0.1 0.1 0.0 0.2
06/18/2016 9 Acceptable 0.0 0.0 0.0 0.0 0.0
05/23/2016 24 Acceptable 0.0 0.0 0.0 0.0 0.0
10/15/2015 50 Acceptable 0.0 0.0 0.0 0.0 0.0
09/14/2015 231 Beach Advisory 0.0 0.9 1.2 0.1 2.3
08/15/2015 61 Beach Advisory 0.3 0.3 0.0 0.0 0.6
07/11/2015 150 Beach Advisory 0.0 0.0 1.2 0.0 1.2
06/13/2015 365 Beach Advisory 0.0 1.3 0.0 0.0 1.3
05/14/2015 21 Acceptable 0.0 0.0 0.1 0.0 0.1
10/16/2014 285 Beach Advisory 0.3 0.1 0.0 0.0 0.4
09/10/2014 60 Acceptable 0.0 0.0 0.0 0.0 0.0
08/14/2014 133 Beach Advisory 0.0 0.1 0.0 0.0 0.1
07/10/2014 727 Beach Advisory 0.0 1.7 0.4 0.3 2.3
06/15/2014 1300 Beach Advisory 0.0 0.5 0.5 0.1 1.0
05/15/2014 120 Beach Advisory 0.1 0.1 0.0 0.0 0.2
10/21/2013 117 Beach Advisory 0.0 0.0 0.0 0.2 0.2
09/21/2013 199 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/19/2013 41 Acceptable 0.0 0.0 0.0 0.0 0.0
07/21/2013 67 Beach Advisory 0.0 0.0 0.0 0.0 0.0
06/24/2013 1203 Beach Advisory 1.4 0.0 0.0 0.0 1.4
06/04/2013 980 Beach Advisory 0.0 0.0 1.1 0.1 1.1
10/15/2012 65 Beach Advisory 0.4 0.5 0.0 0.1 1.0
09/15/2012 64 Beach Advisory 0.1 0.0 0.0 0.0 0.1
08/18/2012 33 Acceptable 0.0 0.1 0.0 0.2 0.3
07/21/2012 28 Acceptable 0.0 0.0 0.0 0.2 0.2
06/16/2012 49 Acceptable 0.0 0.0 0.0 0.2 0.2
05/20/2012 96 Beach Advisory 0.0 0.0 0.0 0.0 0.0
10/16/2011 1553 Beach Advisory 0.0 0.1 1.1 0.3 1.6
09/19/2011 72 Beach Advisory 0.0 0.0 0.0 0.1 0.1
08/21/2011 727 Beach Advisory 0.4 0.0 0.0 0.0 0.4
07/14/2011 108 Beach Advisory 0.0 0.3 0.0 0.0 0.3
07/02/2011 63 Beach Advisory 0.0 0.0 1.0 1.1 2.1
05/19/2011 96 Beach Advisory 0.8 0.2 0.1 0.5 1.7
10/16/2010 1986 Beach Advisory 0.0 1.0 0.3 0.0 1.3
09/14/2010 32 Acceptable 0.0 0.0 0.0 0.0 0.0
08/23/2010 345 Beach Advisory 0.1 0.4 0.0 0.1 0.5
08/21/2010 67 Beach Advisory 0.0 0.1 0.1 0.0 0.2
07/19/2010 579 Beach Advisory 0.0 0.2 0.5 0.0 0.7
06/18/2010 387 Beach Advisory 0.0 0.0 0.2 0.0 0.3
05/25/2010 30 Acceptable 0.0 0.0 0.0 0.0 0.0
10/23/2009 22 Acceptable 0.0 0.0 0.0 0.0 0.0
09/17/2009 99 Beach Advisory 0.0 0.0 0.0 0.0 0.0
08/24/2009 260 Beach Advisory 0.0 0.3 1.0 1.5 2.8
07/31/2009 >2420 Beach Advisory 0.6 0.3 1.0 0.0 1.9
06/13/2009 272 Beach Advisory 0.0 0.3 0.3 0.0 0.6
05/15/2009 54 Acceptable 0.0 0.5 0.0 0.0 0.5
10/23/2008 4 Acceptable 0.0 0.2 0.1 0.0 0.2
09/18/2008 11 Acceptable 0.0 0.0 0.0 0.0 0.0
08/09/2008 42 Acceptable 0.0 0.0 1.3 0.2 1.5
07/17/2008 17 Acceptable 0.0 0.0 0.0 0.1 0.1
06/19/2008 45 Acceptable 0.0 0.4 0.1 0.9 1.4
05/22/2008 34 Acceptable 0.2 0.0 0.0 0.0 0.2

Entero Count (fecal indicator) and Rainfall Correlation

96 Samples taken

All Water Quality Parameters

96 Samples taken

Sample Date [i] Entero 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 [i] Temp (f)
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Temperature

Hudson River water temperature changes seasonally. Surface water temperature can change on small scales in the river reflecting natural and human influences.

[i] Salinity
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Salinity

Estuaries like the Hudson are where freshwaters in rivers meet the sea. Salinity tells us about the relative contribution of fresh and salt water within a particular region of the estuary. 

[i] Chlorophyll
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Chlorophyll

A measure of the amount of microscopic algae present in the water. High chlorophyll counts can mean high levels of the nutrients phosphorus and nitrogen, and the threat, or presence, of algae blooms.

[i] Turbidity
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Turbidity

Turbidity is a measure of the amount of fine particles suspended in the water. As turbidity rises, light penetration, a key factor for aquatic plants and algae, diminishes.

[i] Oxygen
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Oxygen

Oxygen concentrations in the water are closely connected to biological activities. Surface waters are typically in equilibrium with the atmosphere such that the oxygen concentration near the surface is close to fully saturated (100%).

Sort Sort Sort Sort Sort Sort Sort Sort
08/24/2023 70 Beach Advisory 21.93 0.05 2.22 2.6 102.7
07/20/2023 1300 Beach Advisory 23.83 0.07 1.86 19.3 102.1
06/29/2023 231 Beach Advisory 72.8 0.1 2.3 17.9 96.8
05/04/2023 124 Beach Advisory 50.4 0.0 2.6 14.7 105.0
10/13/2022 1733 Beach Advisory 59.4 0.1 2.7 4.1 95.1
09/13/2022 921 Beach Advisory 73.8 0.1 1.9 3.6 91.1
08/22/2022 285 Beach Advisory 79.3 0.1 2.5 1.8 93.9
07/18/2022 134 Beach Advisory 79.3 0.1 3.5 1.5 93.9
06/16/2022 144 Beach Advisory 73.2 0.1 2.2 7.5 96.6
05/26/2022 126 Beach Advisory 67.8 0.1 2.1 7.7 n/a
10/28/2021 2420 Beach Advisory 53.582 0.07 2.99 53.6 102.2
09/16/2021 1733 Beach Advisory 69.566 0.08 1.66 29.8 n/a
08/19/2021 1203 Beach Advisory 76.55 0.06 2.5 4.9 99.7
07/22/2021 1986 Beach Advisory 69.35 0.07 2.73 26.3 104.5
06/10/2021 184 Beach Advisory 75.146 0.12 2.93 5.4 94.5
05/20/2021 16 Acceptable 65.444 0.11 2.47 5.5 100.4
10/17/2020 84 Beach Advisory 59.36 0.12 1.73 3.5 95.2
09/21/2020 44 Acceptable 66.218 0.12 1.98 3.4 102.9
08/17/2020 516 Beach Advisory 80.726 0.11 7.29 4.4 109.5
07/17/2020 870 Beach Advisory 78.296 0.12 2.68 6.3 94.8
06/19/2020 228 Beach Advisory 78.656 0.11 7.78 6.8 109.1
05/29/2020 411 Beach Advisory 75.398 0.11 2.86 6.7 106.3
10/11/2019 457 Beach Advisory 60.116 0.11 1.88 5.8 100.5
09/13/2019 866 Beach Advisory 70.16 0.1 2.52 4.9 98.7
08/09/2019 >2420 Beach Advisory 79.448 0.13 3.49 17.2 95.9
07/12/2019 172 Beach Advisory 78.746 0.09 3.39 6.8 98.3
06/08/2019 35 Acceptable 67.028 0.05 2.66 10.9 109.5
05/11/2019 46 Acceptable 55.904 0.07 2.12 11.9 106.3
10/13/2018 >2420 Beach Advisory 61.898 0.09 2.38 19.2 98.8
09/13/2018 44 Acceptable 73.436 0.14 1.86 6.4 104.9
08/17/2018 388 Beach Advisory 78.062 0.11 3.12 6.7 95.5
07/20/2018 345 Beach Advisory 81.194 0.13 5.21 4.9 103.2
06/16/2018 72 Beach Advisory 74.75 0.13 7.12 5.6 113.1
05/09/2018 17 Acceptable 57.326 0.05 1.93 8.4 110
10/19/2017 50 Acceptable 61.556 0.09 2.71 17.1 100.7
09/14/2017 122 Beach Advisory 69.638 0.07 3.28 6.7 103
08/17/2017 435 Beach Advisory 78.296 0.09 4.36 6.6 105.7
07/13/2017 33 Acceptable 74.858 0.05 0.78 16.8 102.5
06/15/2017 31 Acceptable 72.806 0.06 1.87 14.6 105.2
05/18/2017 3 Acceptable 63.554 0.05 1.87 19 110.1
04/07/2017 93 Beach Advisory n/a n/a n/a n/a n/a
10/18/2016 51 Acceptable 62.618 0.1 1.47 33.5 101.1
09/17/2016 272 Beach Advisory 73.544 0.1 1.52 n/a 98.1
08/18/2016 211 Beach Advisory 81.572 0.1 3.41 25.9 104.8
07/16/2016 22 Acceptable 81.698 0.09 3.31 17.2 98.7
06/18/2016 9 Acceptable 74.822 0.09 0.33 22.1 105.6
05/23/2016 24 Acceptable 64.94 0.1 0.15 20.2 103.4
10/15/2015 50 Acceptable 60.116 0.09 2.66 5.3 100.9
09/14/2015 231 Beach Advisory 74.012 0.13 2.14 10.8 90.8
08/15/2015 61 Beach Advisory 80.636 0.1 7.75 6.8 106.3
07/11/2015 150 Beach Advisory 75.326 0.06 3.72 18.3 106.1
06/13/2015 365 Beach Advisory n/a n/a n/a n/a n/a
05/14/2015 21 Acceptable 67.964 0.1 1.96 9.4 106.9
10/16/2014 285 Beach Advisory 63.14 0.12 4.92 13.9 101.2
09/10/2014 60 Acceptable 75.2 0.08 0.47 10.5 98.5
08/14/2014 133 Beach Advisory 75.542 0.08 2.32 5.1 95
07/10/2014 727 Beach Advisory 76.568 0.08 1.01 45.9 103.2
06/15/2014 1300 Beach Advisory 69.278 0.06 1.44 51.4 109
05/15/2014 120 Beach Advisory 61.862 0.05 0.99 10.4 107.3
10/21/2013 117 Beach Advisory 58.964 0.1 1.68 107.8 99.2
09/21/2013 199 Beach Advisory 67.604 0.13 2.94 23.7 107.8
08/19/2013 41 Acceptable 75.002 0.11 1.16 58.9 106
07/21/2013 67 Beach Advisory 81.896 0.08 2.45 18.9 110.3
06/24/2013 1203 Beach Advisory 74.102 0.09 1.7 32 106
06/04/2013 980 Beach Advisory 68.936 0.06 0.49 40.2 103.8
10/15/2012 65 Beach Advisory 56.804 0.11 1.98 12.1 99.8
09/15/2012 64 Beach Advisory 72.356 0.09 1.18 5.3 102.6
08/18/2012 33 Acceptable 80.006 0.14 2.06 4.4 115.8
07/21/2012 28 Acceptable 82.634 0.13 7.77 8.7 130.7
06/16/2012 49 Acceptable 74.642 0.1 1.6 15.2 109
05/20/2012 96 Beach Advisory 66.578 0.07 0.95 21.7 107
10/16/2011 1553 Beach Advisory 59.882 0.08 1.87 77.9 102.2
09/19/2011 72 Beach Advisory 64.616 0.07 0.85 12.8 104.8
08/21/2011 727 Beach Advisory 77.702 0.11 2.66 19.6 99.7
07/14/2011 108 Beach Advisory 76.892 0.07 5.74 4.1 n/a
07/02/2011 63 Beach Advisory 73.4 0.05 0.74 7.7 n/a
05/19/2011 96 Beach Advisory n/a n/a n/a n/a n/a
10/16/2010 1986 Beach Advisory 53.96 0.07 2.18 48.3 102.3
09/14/2010 32 Acceptable 69.062 0.1 4.71 5.1 100.4
08/23/2010 345 Beach Advisory n/a n/a n/a n/a n/a
08/21/2010 67 Beach Advisory 77.306 0.11 3.02 n/a 97.7
07/19/2010 579 Beach Advisory 81.392 0.1 6.51 3.3 88.9
06/18/2010 387 Beach Advisory 71.492 0.12 4.56 7 104.5
05/25/2010 30 Acceptable 75.722 0.11 6.72 126.8 116.2
10/23/2009 22 Acceptable 50.306 0.08 0.38 21.8 98.9
09/17/2009 99 Beach Advisory 67.838 0.12 2.09 5.2 95.1
08/24/2009 260 Beach Advisory 77.612 0.11 1.86 53.9 105.3
07/31/2009 >2420 Beach Advisory 72.662 0.09 2.09 138.7 102.7
06/13/2009 272 Beach Advisory n/a n/a n/a n/a n/a
05/15/2009 54 Acceptable 64.22 n/a 1.18 5.2 111.4
10/23/2008 4 Acceptable 52.178 0.1 1.48 1.6 96.5
09/18/2008 11 Acceptable n/a n/a n/a n/a n/a
08/09/2008 42 Acceptable n/a n/a n/a n/a n/a
07/17/2008 17 Acceptable 80.042 0.11 2.14 15.4 107.1
06/19/2008 45 Acceptable n/a n/a n/a n/a n/a
05/22/2008 34 Acceptable 59.486 0.12 9.85 13.5 110.2

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 Riverkeeper, Lamont-Doherty Earth Observatory and CUNY Queens College staff, and processed on the Riverkeeper vessel, according to the 2014 Quality Assurance Project Plan.

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:

Troy, NY
The Hudson River, above the lock at Troy, is no longer part of the estuary. This site has boating, kayaking, recreational and subsistence fishing, and occasional swimming.

Agencies Responsible:

Rensselaer County Dept. of Health: 518-270-2655, Albany County Dept. of Health: 518-447-4580 and NYSDEC Region 4: 518-357-2045

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