### Quality of surface-water supplies in the Triangle Area of North Carolina, water years 2012–13

By: C.A. PfeifleJ.L. CainR.B. Rasmussen

                            https://doi.org/10.3133/ofr20161137

#### Links

-                                                                                                                             Document:                                                                                                                                                                                                                                                  **Report**                                                                                                     (4.97 MB pdf)                                                                                                                                     
- Table:  **Table 3 -**                            (xlsx)  Summary of water-quality results for sampled sites in the Triangle Area Water Supply Monitoring Project, October 2011 through September 2013
- Appendixes:                               - **Appendix 1 -**                            (83.7 KB xlsx)                          Water-quality data for surface-water samples collected from October 2011 through September 2013 at the Triangle Area Water Supply Monitoring Project study sites, North Carolina
  - **Appendix 2 -**                            (27.7 KB xlsx)                          Analytical results for blanks collected from October 2011 through September 2013 during surface-water sampling at the Triangle Area Supply Monitoring Project study sites, North Carolina
  - **Appendix 3 -**                            (35.6 KB xlsx)                          Analytical results for the environmental and replicate sample sets collected from October 2011 through September 2013 at the Triangle Area Water Supply Monitoring Project study sites, North Carolina
  - **Appendix 4 -**                            (24 KB xlsx)                          Chemical constituents and physical properties analyzed by the U.S. Geological Survey National Water Quality Laboratory for the Triangle Area Water Supply Monitoring Project, and the methods used for sample analyses, October 2011 through September 2013 
- Data Releases:                               - **USGS data release**  - Associated data for Surface-Water Supplies in the Triangle Area of North Carolina, Water Years 2012-13
  - **USGS data release**  - Associated data for Surface-Water Supplies in the Triangle Area of North Carolina, Water Years 2012-13 
- Download citation as:  RIS                         |                         Dublin                            Core

#### Abstract

First posted September 7, 2016

**For additional information, contact:**
Director South Atlantic Water Science Center  U.S. Geological Survey  720 Gracern Road  Columbia, SC 29210 http://www.usgs.gov/water/southatlantic/

Surface-water supplies are important sources of drinking water for residents in the Triangle area of North Carolina, which is located within the upper Cape Fear and Neuse River Basins. Since 1988, the U.S. Geological Survey and a consortium of local governments have tracked water-quality conditions and trends in several of the area’s water-supply lakes and streams. This report summarizes data collected through this cooperative effort, known as the Triangle Area Water Supply Monitoring Project, during October 2011 through September 2012 (water year 2012) and October 2012 through September 2013 (water year 2013). Major findings for this period include:
              - Annual precipitation was approximately 2 percent above the long-term mean (average) annual precipitation in 2012 and approximately 3 percent below the long-term mean in 2013.
              - In water year 2012, streamflow was generally below the long-term mean during most of the period for the 10 project streamflow gaging stations. Streamflow was near or above the long-term mean at the same streamflow gaging stations during the 2013 water year.
              - More than 7,000 individual measurements of water quality were made at a total of 17 sites—6 in the Neuse River Basin and 11 in the Cape Fear River Basin. Forty-three water-quality properties or constituents were measured; State water-quality standards exist for 23 of these.
              - All observations met State water-quality standards for pH, temperature, hardness, chloride, fluoride, sulfate, nitrate, arsenic, cadmium, chromium, lead, nickel, and selenium.
              - North Carolina water-quality standards were exceeded one or more times for dissolved oxygen, dissolved-oxygen percent saturation, turbidity, chlorophyll  a , copper, iron, manganese, mercury, silver, and zinc. Exceedances occurred at all 17 sites.
              - Stream samples collected during storm events contained elevated concentrations of 19 water-quality constituents relative to non-storm events.

#### Suggested Citation

Pfeifle, C.A., Cain, J.L., and Rasmussen, R.B., 2016, Quality of surface-water supplies in the Triangle area of North Carolina, water years 2012–13: U.S. Geological Survey Open-File Report 2016–1137, 18 p., http://dx.doi.org/10.3133/ofr20161137.

ISSN: 2331-1258 (online)

#### Study Area

#### Table of Contents

- Abstract
- Introduction
- Monitoring Network
- Quality Assurance
- Precipitation and Streamflow
- Water Quality
- References Cited

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