Esopus Creek

Citizen Testing Sites

Water Quality Conditions by Location

Recent Samples Historical Statistics
Site Name (Watershed) Sample Date [i] Entero Count

Entero Count

Enterococcus (“Entero”) is a fecal indicating bacterium that lives in the intestines of humans and other warm-blooded animals.

[i] 4 Days Total Rain (in)

4 Days Total Rain (in)

The combined rainfall for the day of sampling, prior day, two days prior and three days prior. More than 1/4 inch is considered a “wet weather sample.”

[i] Number of Samples

Number of Samples

Total number of samples included in these calculations.

[i] Geometric

Geometric Mean

A measure of central tendency (a weighted average) used by NYS DEC and the US EPA to assess water quality. The geometric mean is defined as the nth root (where n is the number of samples) of the product of the Enterococcus measurements. A geometric mean over 30 fails the EPA criteria for safe primary contact.

[i] Maximum


The highest Enterococcus count we have recorded at this site (“>” indicates an unknown number greater than this number and reflects the upper limit of our scoring ability for this sample).

[i] Minimum


The lowest Enterococcus count we have recorded at this site (“<” indicates an unknown number less than this number and reflects the lower limit of our scoring ability for this sample).

Individual Entero Counts by Site

Note: multiple counts of the same value will overlap and appear as one dot.

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+)

Geometric Mean*

Acceptable (0–30) Unacceptable (31+)

*Weighted average of multiple
samples; Enterococcus count
per 100mL

Riverkeeper’s citizen science partners sample the Esopus Creek downstream of the Ashokan reservoir. The upper portion of the watershed, including the reservoir and the waterways upstream of it, is part of New York City’s water supply, but the Lower Esopus Watershed, downstream of the reservoir, is not.

Below the Ashokan Reservoir, the Esopus Creek flows through a narrow valley before turning to the northeast and entering a wide, agricultural floodplain. Throughout this section stream water is withdrawn to irrigate the nearby farms. The creek’s valley narrows again, flowing into the Esopus Gorge near Mt. Marion before joining the Hudson River at Saugerties.

The lowermost two miles of the Esopus Creek are tidally influenced and are important year-round habitat for a wide variety of fish, amphibians, birds and mammals. Upstream of Kingston, the creek and some of its tributaries are designated by NYS DEC as trout waters.

The portions of the Esopus Creek where Riverkeeper monitors are used for kayaking and swimming both at official beaches and informal spots.

Read Riverkeeper’s 2021 data report for the Esopus Creek Watershed.



Riverkeeper partners with watershed citizens to sample the Esopus Creek.

  • Waterway Classifications

  • Water Quality Data and Impairments

  • Wastewater Infrastructure

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