In developed watersheds with large impervious surface areas such as roads, driveways, and rooftops, stormwater runs over impervious surfaces, collecting pollutants such as sediment, nutrients, and oil and grease as it travels, enters the nearest storm drain or stream and ultimately ends up in Lake Tahoe. All storm drains eventually lead to Lake Tahoe. Runoff containing fine sediment and nutrients cloud the water and feed algal growth, which has led to over 30 feet of clarity loss since the 1960’s. Science shows that implementing Best Management Practices (BMPs) on new or existing development can improve Lake Tahoe’s water quality and clarity. BMPs are measures taken to minimize soil erosion and capture polluted water before it enters Lake Tahoe and are required on all new development and redevelopment projects in the Region.

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