Deadline Approaching: Connecticut Schools Have Until December 1, 2026 to Register Under DEEP’s Revised Commercial Stormwater General Permit

Connecticut schools and other educational institutions have less than two months to act. December 1, 2026 is the registration deadline for existing sites that are now covered by the Connecticut Department of Energy and Environmental Protection’s (“DEEP”) revised General Permit for the Discharge of Stormwater Associated with Commercial Activities (“CSGP”) but were never required to obtain coverage before. Public and private school campuses that newly fall within the permit’s scope should confirm their status and get ready to register now.

A Quick Recap: Why Schools Are Now Covered

DEEP issued the revised CSGP on December 1, 2025. The permit still applies to owners or operators of sites with five or more acres of contiguous impervious surface, such as rooftops, parking lots, driveways, and walkways. The change is in which land uses are regulated. The revised permit now expressly covers educational services, which includes public and private elementary and secondary schools as well as colleges, universities, and professional schools.

As a result, many school campuses that were never regulated under the CSGP may now need permit coverage. Schools that lease space to third parties, share facilities, or operate on multi-tenant properties should also look closely at the revised permit’s expanded provisions on how compliance responsibility is split between property owners and occupants.

What Must Happen Before December 1

Schools subject to the CSGP must register with DEEP through its online permitting system. The fee is $625, and municipalities qualify for a reduced fee.

Registration is only the first step. Covered entities must also prepare and implement a site-specific Stormwater Management Plan (“SMP”) under the guidance of a qualified consultant. The SMP must identify potential sources of stormwater contamination and set out best management practices to minimize pollutant runoff. For schools, these practices may include:

• Regular sweeping of parking areas and other paved surfaces;
• Routine maintenance of catch basins and drainage systems;
• Spill prevention and response procedures; and
• Staff training on stormwater protection.

Covered schools must also prepare a detailed site plan showing impervious surfaces, drainage features, and outfalls. They must conduct annual stormwater sampling, along with quarterly inspections, monitoring, and reporting. DEEP’s Fact Sheet and FAQ provide more detail on these requirements.

A Short Checklist for the Weeks Ahead

With the deadline close, schools that have not yet addressed the revised CSGP should prioritize the following:

1. Confirm applicability. Measure whether the campus has five or more acres of contiguous impervious surface. Pay close attention to all buildings, lots, and paved areas.
2. Clarify responsibility. If the property is leased, shared, or multi-tenant, decide who holds compliance obligations under the revised permit.
3. Register with DEEP. Submit the registration and fee through DEEP’s online system before December 1, 2026.
4. Begin the SMP and site plan. Engage qualified environmental consultants to map drainage features and outfalls and to develop site-specific best management practices.
5. Document a “not covered” determination. If the school concludes it is not subject to the CSGP (e.g.,  because it calculated less than five acres of contiguous impervious surface), document that conclusion and its basis in writing. Keep it in institutional records in case of a future regulatory inquiry.

Don’t Wait Until the Last Week

Determining applicability and preparing the SMP are site-specific tasks that often take substantial lead time, particularly for campuses with several buildings, complex drainage systems, or shared-use arrangements.

Working early with experienced legal counsel and environmental consultants can help schools meet the deadline, manage compliance efficiently, and reduce enforcement risk.