•  Swimmable
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LEARN ABOUT GRADES


  • Indicators
    • Overall Health Index
    • Dissolved Organic Carbon
    • Dissolved Oxygen
    • Water Clarity
    • Chlorophyll a
    • Seaweeds
    • Oxygen Saturation
  • Map Layers

    Sewage treatment plants with permit number listed.

    Outfall pipes where combined raw sewage and stormwater can overflow and discharge.

    Public locations to launch a boat.

    Public locations to launch a hand powered vessel. Town fees may apply.

    Potential EJ communities in the Long Island Sound watershed, based on 2000 census data.

    The land area that drains to a particular body of water.

    The land area that drains to a particular body of water.

    ≥ 0%
    ≥ 5%
    ≥ 10%
    ≥ 15%
    ≥ 20%
    ≥ 25%
    Areas covered by impenetrable materials such as asphalt, stone or rooftops.

     Agricultural Vegetation

     Aquatic Vegetation

     Developed & Other Human Use

     Forest & Woodland

     Introduced & Semi Natural Vegetation

     Nonvascular & Sparse Vascular Rock Vegetation

     Open Water

     Polar & High Montane Vegetation

     Recently Disturbed or Modified

     Semi-Desert

     Shrubland & Grassland

  Report Pollution
a project of
  • Swimmable
  • Fishable
  • Livable
  • Explore
    • Challenges
    • Reports
    • Learn About the Grades (Swimmable)
    • Learn About the Grades (Fishable)
    • Data Sources
  • About
    • Why We Love Long Island Sound
    • About SHE
    • Save the Sound
    • Water Monitoring
    • Unified Water Study
    • Contact Us
  • Take Action
  • Donate