​Effective July 2, 2012

BACKGROUND

Both Falls Lake and Jordan Lake are considered polluted due to excessive nutrient inputs, and stormwater runoff is one of the major sources. As a result, both lakes have been designated as Nutrient Sensitive Waters (NSW) by the North Carolina Division of Water Quality (DWQ). The Falls Lake and Jordan Lake rules passed by the State require local governments to adopt stormwater standards for new development. On July 2, 2012, the Wake County Board of Commissioners approved a UDO Amendment, OA-03-12, State-mandated stormwater rules for new development in the Falls Lake and Jordan basins.

 

Standards Checklist for Falls Lake

 

Standards Checklist for Jordan Lake

 

STANDARDS

For a complete list of new stormwater standards for new development in Falls and Jordan Lake, see checklist links below.

 

Nutrient Standards
Stormwater runoff from new development in Jordan and Falls Lake must meet both nitrogen and phosphorus limits. Nutrient reduction requirements for the Falls Lake and Jordan Lake watersheds differ slightly. Nitrogen and phosphorus limits are different depending on which watershed the development is located. The following table differentiates nutrient loading requirements by nutrient management strategy. Jordan Lake Watershed is divided into two regulatory jurisdictions – Upper New Hope (UNH) and Lower New Hope (LNH). View a map of these two jurisdictions.
 
EXISTING VERSUS NEW STANDARDS
FOR NEW DEVELOPMENT IN WAKE COUNTY
​Standard Wake County​ Existing Neuse NMS *​ New Falls Lake NMS​ New Jordan Lake NMS​
Nitrogen Export Limit
lbs/ac/yr
N/A​ 3.6​ ​2.2
2.2 (UNH)
4.4 (LNH)​
Phosphorus Export Limit
lbs/ac/yr
N/A​ ​N/A 0.33​
0.82 (UNH)
0.78 (LNH)​
Stormwater Management
Land Disturbance Threshold​
Residential = All Regular Subdivisions and
Minor Subdivisions>15% Impervious
Nonresidential = 1/2-Acre
Residential = 1 Acre
Non-residential = 1/2-Acre
Residential = 1/2-Acre
Non-residential = 12,000 SF

 

Residential = 1 Acre

 

Non-residential = 1/2-Acre

  
 * The Neuse Rules are currently applied county-wide. All developments must meet state, local and federal regulations. If these regulations are inconsistent, the more restrictive standard governs.

 

Nutrient Offset Process
[N.C. Dept. of Environment and Natural Resources (NCDENR) website]

 

The Hybrid Tool is for residential and non-residential development will be required by engineers for plan submittals beginning August 1, 2012, for all stormwater submittals in Wake County's jurisdiction. The tool will incorporate TCN requirements, peak flow as well as the nutrient loading methodology provided in the Jordan/Falls Accounting Tool.