Physical, chemical and biological properties of the surface water that are measured continuously while the patrol boat is underway.
Water Quality > Hudson River Estuary Data > Rockland County & Westchester County Sites > Saw Mill River
Saw Mill River
Entero Count (fecal indicator) and Rainfall
1 Samples taken
| Sample Date |
[i]
Enterococcus Count
Entero CountEnterococcus (“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 |
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Entero Count (fecal indicator) and Rainfall Correlation
1 Samples taken
All Water Quality Parameters
1 Samples taken
| Sample Date |
[i]
Entero Count
Entero CountEnterococcus (“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)
TemperatureHudson River water temperature changes seasonally. Surface water temperature can change on small scales in the river reflecting natural and human influences. |
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Salinity
SalinityEstuaries 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. |
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Chlorophyll
ChlorophyllA 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. |
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Turbidity
TurbidityTurbidity 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. |
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Oxygen
OxygenOxygen 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%). |
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Water Quality*
*Single sample thresholds;
Enterococcus count per 100mL
Prior Four Day Rainfall
(in inches)
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:
Yonkers, NY
The Sawmill River enters the Hudson at Yonkers. There is boating, kayaking, recreational and subsistence fishing in this area.
Agencies Responsible:
Westchester County Dept. of Health: 914-813-5000 and NYSDEC Region 3: 914-428-2505