Falls Lake

Falls LakeFalls Lake, located in the Neuse River Basin, provides the drinking water for a half million people in Raleigh and six other municipalities in eastern Wake County: Garner, Knightdale, Rolesville, Wake Forest, Wendell and Zebulon.  The Neuse River Basin is one of the fastest growing river basins in the country.  Demand for drinking water from Falls Lake will rise as Wake County’s population eventually doubles (currently growing by 63 people a day).  Falls Lake was within six weeks of running dry during the record drought of 2007-8.  Future drought will likely put lake supply at risk again, according to climatologists’ predictions.  The City of Raleigh is considering options to increase water supply from Falls Lake.

Falls Lake during record drought 2007-8DryFallsLake2007

Increasing development could have detrimental economic and public health consequences if sustainable water protection policies are not proactively carried out.  Falls Lake has been declared “impaired” (i.e., polluted) by the State of North Carolina due to polluted stormwater runoff and wastewater discharged upstream.  Research by the NC Division of Water Quality (DWQ) and NC State University indicate overabundance of nutrients (nitrogen and phosphorus) with chlorophyll A levels exceeding federal clean water standards and causing toxic algal blooms in the lake.  Levels are worst in the upper part of Falls, caused primarily by pollution and stormwater runoff draining downstream from Durham, Orange, Granville Counties. Click here for a map to see where chlorophyll A exceeds federal standard.  High levels of chlorophyll A lead to
reduced light penetration and low oxygen levels, both of which negatively Algae Falls Lakeimpact water quality.  This has necessitated the use of increasing amounts of chemicals and expensive filtration by Raleigh Public Utilities to maintain safe water quality.

Without improvements to current wastewater treatment and stormwater practices, Falls Lake will remain impaired. Following 18 months of negotiations and input from local stakeholders, the NC Environmental Management Commission adopted the Falls Lake rules onJanuary 15, 2011.

The rules aim to reduce nitrogen and phosphorus significantly. DWQ developed the rules which break the cleanup process into two components, focusing first on the lower, less-polluted portion of the lake, and then moving upward to the poorest water quality in the upper basin.  These rules call for actions to be taken by local governments, developers, existing development, agriculture, and wastewater treatment in Durham, Orange, Granville, and Wake Counties until 2035.  The Upper Neuse River Basin Association – comprised of local governments surrounding Falls Lake – has undertaken new research to assess needs for updates to the rules.  Also, the NC General Assembly mandated a review of rules as well, and changes to the rules are likely.  However, because the clean-up was given a $1.5 billion price-tag, future attacks to weaken these important rules may occur. WakeUP continues to monitor and provide input in order to advocate for a clean Falls Lake.

Please see additional information about the Falls Lake rules and conditions and factors contributing to the Falls Lake water quality problem:

Presentations from WakeUP 2014 Water Quality Series: Clean Water, More Valuable than Oil: State Actions Affecting Your Water:


WakeUP’s Falls Lake fact sheet (printable pdf)Falls Lake nutrient strategy website

Falls Lake nutrient strategy website

WakeUP’s comments to protect public water to state and EPA during EMC Triennal Review on Nov 19, 2013

Falls Lake online TV mini-series