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  • Recycling & Waste Reduction
  • SCDES Laboratories
  • Analytical and Radiological Environmental Services Division
  • Radon Poster Contest
    A hand-drawn illustration of a house with its interior exposed, showing various rooms and activities. The text "Radon Kills" is prominently displayed at the top. Below, text reads, "You won't know it's there until it's too late. Radon poisoning is preventable. Get your home tested now!" The background is shaded in yellow, emphasizing the message., 2026 South Carolina Radon Poster Contest is NOW OPEN!, 2026 South Carolina Radon Poster Contest Guidelines,  , Poster Contest Artwork Submission Form, If you would like information about next year’s contest, contact the SC Radon Program at, radon@des.sc.gov, to be added to the mailing list.    2025 First Place Winner Wilhelm, South Carolina   ,  ,  , Award Recipients by Year,  
  • Jurisdictional Lines Review Process
  • Air Dispersion Modeling - Guidance and General Information
    Air Quality Modeling Guidance and Forms, Modeling Guidelines for Air Quality Permits (10/15/2018; revised 1/9/2025) Emission Point Data Instructions (9/25/2023) Other Information Guidance for Air Standards Demonstrations (12/19/2024) Standard 7 Increments Guidance (8/30/2024) PSD Minor Source Baseline Date by County (10/16/2023) Leak Detection and Repair (LDAR) Guidelines EPA SCRAM (Support Center for Regulatory Atmospheric Modeling)…, Consultants, Air Dispersion Modeling Consultants Listing 10/14/2022  
  • WaterSC Meetings
  • Municipal Separate Storm Sewer Systems (MS4s)
    By definition an MS4 is a system of conveyances that include, but are not limited to, catch basins, curbs, gutters, ditches, man-made channels, pipes, tunnels, and/or storm drains that discharge into, Waters of the State, . For these conveyances or system of conveyances to be recognized as an MS4, a state, city, town, village, or other public entity must own them. These conveyances must also not be part of a Publicly Owned Treatment Works and may not operate as a combined sewer. Operators of large, medium and regulated small Municipal Separate Storm Sewer Systems are required to obtain, NPDES permit coverage, in order to discharge pollutants into Waters of the State. These designations (large, medium, and small) are based on urbanized areas as determined by the latest census. South Carolina has one (1) large MS4 - the South Carolina Department of Transportation and three (3) medium MS4s -, City of Columbia, Greenville County, and Richland County., These MS4s receive individual NPDES permits for their discharges. There are also over, 70 regulated small MS4s, in South Carolina. The operators of these may choose to receive coverage under a general permit or obtain individual permit coverage. Documents icon, Technical Documents, Download all MS4 related documents including the general permit, worksheets and checklists. Links icon, Stormwater Contacts, Need to get in touch with an MS4 representative? Check out the MS4 Contact Page for recent regulator information. Stormwater drain pipe icon, Stormwater Links, All internal and external links related to the MS4 Community., Municipal Separate Storm Sewer Systems (MS4s), Large and Medium MS4s must prepare and submit a permit application to address each of the following elements: Structural control maintenance Areas of significant development or redevelopment Roadway runoff management Flood control related to water quality issues Municipal owned operations such as landfills, wastewater treatment plants, etc. Hazardous waste treatment, storage or disposal sites,…
  • Stormwater - Construction Activities
    2026 Construction General Permit, - 2026 Construction General Permit - Formal Response to Comments, SCDES held an informational session on Feb. 5, 2026., -, Information Session Recording, -, Informational Session Presentation
  • Infectious Waste Package, Storage, Transport, Treatment
    How should infectious waste be packaged and stored?, Sharps must be placed in rigid, leak- and puncture-resistant containers secured tightly. All other waste should be stored and maintained in a rigid or semi-rigid leak-proof container. Containers must be strong enough to resist bursting and tearing during handling and transport and must be able to be closed tightly and securely. Plastic bags used inside containers must be red or orange. Reusable…, Transport/Treatment of Waste, Rules:, Containers must be labeled properly before transport. Labeling must be clearly visible and include: Biohazard symbol Infectious Waste Program Registration Number Date the container was placed in storage or sent off-site Words INFECTIOUS WASTE (or BIO-HAZARDOUS WASTE or MEDICAL WASTE). Before waste can be transported, it must be manifested. This manifest must accompany waste at all times after…, Attention, Infectious Waste Registrations and Renewals can now be completed online using ePermitting.  Please use the link below to complete a new registration or renew an existing registration., https://epermitting.des.sc.gov/,  , If you need assistance or have questions please email , infectiouswaste@des.sc.gov, .