Notice of Call for Public Comments ~Regulations on groundwater discharge into urban rainwater separation sewers (MS4)~

Sub Levels


Current requirements (pre-regulation)

DOEE currently permits and supervises the discharge of groundwater to the district’s surface water bodies through the City’s Separate Storm Sewer System (MS4). Wastewater passing through a combined sewer system or sewer system is monitored by DC Water. DOEE’s Groundwater Discharge Permit (GDA) program screens and inspects discharges into MS4 to ensure districts comply with NPDES permits and to prevent contaminated groundwater from reaching district rivers and streams. approve. DOEE’s program provides an efficient method of groundwater treatment for construction dewatering units and sump that collect groundwater in the basement of buildings.

Groundwater discharged into MS4 (see CSS and MS4 maps) must first be screened and approved by the DOEE. This includes water from drainage pumps in non-residential buildings and water from construction projects that encounter groundwater during excavation (such as buildings with basements and parking lots in areas with shallow groundwater tables). Application requirements include DOEE-approved groundwater characterization prior to discharge and planned wastewater monitoring during discharge. If you would like more information on whether your site is eligible for a groundwater discharge permit and what steps you need to complete to apply, please contact us. [email protected].

Proposed regulation

DOEE has drafted a new set of regulations codifying the groundwater discharge permit program. The new regulations will make the application review and permit oversight process more transparent and predictable, while diligently protecting the district’s surface water bodies. These proposed regulations recently received final approval for posting in the DC Register. We will schedule public meetings to provide an opportunity for stakeholders to learn about the new regulations and ask questions before submitting public comments.

– The Draft Regulations for the DC Register will be published on May 26, 2023.
– Updated meeting schedule for next week.





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