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National Association of Clean Water Agencies

Native Plants

Plants which occurred in an area before disturbance by humans.

Natural Filter

A grassed, wooded or vegetative strip that acts as a filter for the runoff before the water enters a stream.

Non-Capacity-Related SSO

Discharges from a wastewater system in dry weather into a receiving stream rather than a treatment plant, usually as a result of a blockage or break in the system.

Also known as a Dry Weather Overflow.

Non-point Source Pollution

Pollution which does not enter the water from any discernible, confined and discrete conveyance source but rather wash off, run off or seep from broad areas of land.


National Pollutant Discharge Elimination System