NPDES Wastewater Permitting

Hot Topics

DWR Addressing Erroneous Wastewater Facility Violations: N.C. Division of Water Resources staff are updating records to correct a technical issue with EPA electronic data reporting that has generated erroneous wastewater facility violations.

During a June 2016 upload of data for National Pollutant Discharge Elimination System permitted facilities from the division’s database to the EPA’s Integrated Compliance Information System (ICIS), numerous permit influent values reported for specific parameters were inadvertently and incorrectly linked to effluent limits in ICIS. This caused the database to generate erroneous facility violations, which were subsequently published on the EPA’s Enforcement and Compliance History Online website.

Staff at both agencies are aware that these faulty calculations have inaccurately characterized several North Carolina facilities as being in violation of permit terms. The Division of Water Resources is working diligently to correct this issue and display correct information in the data management systems.

For questions related to the compliance status of a particular facility, please contact Mr. Bob Sledge at 919-807-6398.

EPA’s Electronic Reporting Rule and how it may affect permit holders.

Precision in Discharge Monitoring Reports: Summarizes common conventions (and exceptions) for significant figures and rounding and describes their proper use in completing DMRs. Please direct questions to Mike Templeton at 919-807-6402 or

NPDES Permit Guidance

Engineering Alternatives Analysis
NC Model Mercury Minimization Plan
Reduction of Monitoring Frequencies for Exceptional Performance
Mixing Zones
Swamp Waters
Zero-Flow Streams
Trout Waters
Planning For An Expansion: A Guidance Document for Municipalities

Pollutant Specific Permitting Guidance

Toxicity Testing
Fecal Coliform
Total Residual Chlorine
Total Residual Chlorine Compliance Level
Total Metals

NPDES Implementation of Instream Dissolved Metals Standards – Freshwater Standards

NPDES Implementation of Instream Dissolved Metals Standards – Saltwater Standards

Basin Specific Permitting Guidance

Goose Creek
South Fork Catawba River Basin Color 

Facility Specific Permitting Guidance

Water Treatment Plant (WTP) Strategy
Assessment & Recommendations for WTP Permitting: Findings of the WTP Workgroup
Bulk Oil Terminals
Vehicle Pressure Washing  

NPDES Compliance Guidance

Significant Figures and Their Use on Discharge Monitoring Reports (DMRs)
DMR Calculations
NPDES Reporting Requirements
Wastewater Treatment Plant Annual Report Guidelines
Special Order by Consent (SOC) Guidance Document
Active Special Order by Consent (SOC) list
NPDES Standard Conditions 
Dissolved Metal to Total Metal Limit Calculators: Includes median HUC hardness values, user guide and calculators to assist permittees in understanding how the proposed Surface Water Standards (dissolved metals) impact permit limits.

Other Links

NPDES Compliance and Enforcement Information
Stormwater Permitting Program
DENR Customer Service Center
PERCS Unit: Sewer collection system permits and pretreatment
Land Application Unit: Non-discharge permits such as wastewater disposal systems consisting of surface irrigation, high rate irrigation, recycle or reuse.