Water Quality Data Assessment
What is water quality assessment?
Each monitored waterbody in North Carolina receives an assessment every two years. The most current assessment is the Draft 2014 Statewide Assessment and is available on the right side of the page. The first page of the document shows the various assessment categories. Additional assessment categories are typically added from year to year to aid in tracking assessment history and restoration activities.
What are impaired waters?
What is the 303(d) List?
How are water quality standards made and do they change?
How is the assessment methodology made and does it change?
Who collects the data?
Data used for water quality assessment is primarily collected by DWR's Ambient Monitoring System, NPDES Discharge Monitoring Coalitions , and Biological Assessment Branch, the NC DENR Division of Environmental Health, and the United States Geological Survey. Local governments and environmental groups as well as industry, municipal and university coalitions also provide data. Submitted data sets must include an approved Quality Assurance Project Plan (QAPP) to assure that the data were collected in a manner consistent with agency data. A standing solicitation for data is listed below.
Where to find data
DWR stores data from the Ambient Monitoring System on EPA's STORET online database. Guidance on how to search and download data is available on the DWR AMS homepage.
How you can submit data
DWR invites all interested parties to submit water quality data and information. The quality and reliability of data submitted determines the programs and projects for which the data can be used. DWR uses only the highest quality data for regulatory decision-making and water quality assessment.IF YOU INTEND TO SUBMIT DATA FOR DWR USE, PLEASE CONTACT US BEFORE BEGINNING DATA AND INFORMATION COLLECTION, TO ENSURE THAT WHAT YOU SUBMIT IS USABLE FOR ITS INTENDED PURPOSE.
What pollution sources are causing the impairment?
DWR Basinwide Planning Reports are an excellent resource for finding detailed information on the probable sources of pollution for 303(d) listed waterbodies.
How are waters removed from the 303(d )list?
Waters are removed when either a TMDL, or TMDL Alternative, is completed or when monitoring data shows that the waterbody is in compliance with water quality standards. Waters that are suspected to be impaired due to natural conditions may be removed with approval from the US EPA with appropriate documentation.
303(d) and Integrated Report Files
Draft 303(d) List
Supplemental 303(d) List Information
Statewide WQ Assessment Information