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Harbor Island Beach
WESTCHESTER, NY

CURRENT CONDITIONS   

Harbor Island Beach is a town operated beach and park complex in Mamaroneck, New York. It is open to the public with an increased fee for non-residents.

Harbor Island Beach WESTCHESTER, NY

Dive into the Data

  • D+ 2025

    In 2025, water quality samples at Harbor Island Beach failed 33% of the time.

    Water quality samples fail when bacteria levels are >104 colony forming units (cfu) of Enterococcus per 100mL.

      80% of samples failed after wet weather

      19% of samples failed after dry weather

        21 total samples were analyzed with 5 wet samples and 16 dry samples.

        The most recent sample date was September 8, 2025.

    Dry Weather
    FRQSometimes Fails
    MAGLow Intensity Failure

    Wet Weather
    FRQConsistently Fails
    MAGHigh Intensity Failure

  • BACTERIA LEVELS

    Colony Forming Units (CFU) of enterococcus/100 mL

    16 in
    D+
    		 2025
    22 in
    D
    		 2024
    18 in
    C-
    		 2023
    15 in
    F
    		 2022
    23 in
    D
    		 2021
    13 in
    D+
    		 2020
    16 in
    D
    		 2019
    8 in
    C-
    		 2018
    10 in
    A
    		 2017
    6 in
    C
    		 2016
    10 in
    C-
    		 2015
    14 in
    A+
    		 2014
    18 in
    A+
    		 2013
    16 in
    D+
    		 2012
    21 in
    D
    		 2011
    10 in
    D+
    		 2010
    18 in
    C-
    		 2009
    13 in
    D
    		 2008
    13 in
    C-
    		 2007
    21 in
    B-
    		 2006
    9 in
    B+
    		 2005
    14 in
    B
    		 2004
    19 in
    F
    		 2003
    A
    B
    C
    D
    F
    N/A