Last Updated 08/25/2026
Stormwater Code: Excerpts from Trenton, New Jersey
Chapter 254 Stormwater Management
Design and Performance Standards for Structural Stormwater Management Measures
- Stormwater management measures for major development shall be designed to provide erosion control, groundwater recharge, stormwater runoff quantity control, and stormwater runoff quality treatment as follows:
- The minimum standards for erosion control are those established under the Soil and Sediment Control Act, N.J.S.A. 4:24-39 et seq., and implementing rules at N.J.A.C. 2:90.
- The minimum standards for groundwater recharge, stormwater quality, and stormwater runoff quantity shall be met by incorporating green infrastructure.
- Stormwater management measures for minor development shall be designed to provide erosion control and stormwater runoff control, as follows.
- The minimum standards for erosion control are those established under the Soil and Sediment Control Act, N.J.S.A. 4:24-39 et seq., and implementing rules at N.J.A.C. 2:90.
- The minimum standards for stormwater runoff quantity shall be met by incorporating green infrastructure.
- The standards in this article that apply to new major development and are intended to minimize the impact of stormwater runoff on water quality and water quantity in receiving water bodies and maintain groundwater recharge. The standards in this article that apply to minor development are intended to minimize the impact of stormwater runoff by retaining the first one-inch of precipitation on impervious surfaces onsite. The standards do not apply to new major development or minor development to the extent that alternative design and performance standards are applicable under a regional stormwater management plan or Water Quality Management Plan adopted in accordance with Department rules.
Safety Standards for Stormwater Management Basins
- This section sets forth requirements to protect public safety through the proper design and operation of stormwater management BMPs. This section applies to any new stormwater management BMP.
- The provisions of this section are not intended to preempt more stringent municipal or county safety requirements for new or existing stormwater management BMPs. Municipal and county stormwater management plans and ordinances may, pursuant to their authority, require existing stormwater management BMPs to be retrofitted to meet one or more of the safety standards in Section 254-9C(1)-(3) for trash racks, overflow grates, and escape provisions at outlet structures.
- Requirements for trash racks, overflow grates and escape provisions.
- A trash rack is a device designed to catch trash and debris and prevent the clogging of outlet structures. Trash racks shall be installed at the intake to the outlet from the Stormwater management BMP to ensure proper functioning of the BMP outlets in accordance with the following:
- The trash rack shall have parallel bars, with no greater than six-inch spacing between the bars;
- The trash rack shall be designed so as not to adversely affect the hydraulic performance of the outlet pipe or structure;
- The average velocity of flow through a clean trash rack is not to exceed 2.5 feet per second under the full range of stage and discharge. Velocity is to be computed on the basis of the net area of opening through the rack; and
- The trash rack shall be constructed of rigid, durable, and corrosion resistant material and designed to withstand a perpendicular live loading of 300 pounds per square foot.
- An overflow grate is designed to prevent obstruction of the overflow structure. If an outlet structure has an overflow grate, such grate shall meet the following requirements:
- The overflow grate shall be secured to the outlet structure but removable for emergencies and maintenance.
- The overflow grate spacing shall be no greater than two inches across the smallest dimension.
- The overflow grate shall be constructed and installed to be rigid, durable, and corrosion resistant, and shall be designed to withstand a perpendicular live loading of 300 pounds per square foot.
- Stormwater management BMPs shall include escape provisions as follows:
- If a stormwater management BMP has an outlet structure, escape provisions shall be incorporated in or on the structure. Escape provisions include the installation of permanent ladders, steps, rungs, or other features that provide easily accessible means of egress from stormwater management BMPs. With the prior approval of the municipality pursuant to Section 254-9C, a free-standing outlet structure may be exempted from this requirement;
- Safety ledges shall be constructed on the slopes of all new stormwater management BMPs having a permanent pool of water deeper than 2 1/2 feet. Safety ledges shall be comprised of two steps. Each step shall be four to six feet in width. One step shall be located approximately 2 1/2 feet below the permanent water surface, and the second step shall be located one to 1 1/2 feet above the permanent water surface. See Section 254-9E for an illustration of safety ledges in a stormwater management BMP; and
- In new stormwater management BMPs, the maximum interior slope for an earthen dam, embankment, or berm shall not be steeper than three horizontal to one vertical.
- A trash rack is a device designed to catch trash and debris and prevent the clogging of outlet structures. Trash racks shall be installed at the intake to the outlet from the Stormwater management BMP to ensure proper functioning of the BMP outlets in accordance with the following:
- Variance or exemption from safety standard. A variance or exemption from the safety standards for stormwater management BMPs may be granted only upon a written finding by the municipality that the variance or exemption will not constitute a threat to public safety.
Maintenance and Repair
- The design engineer shall prepare a maintenance plan for the stormwater management measures incorporated into the design of a major development or minor development. For existing Stormwater Management BMPs, a professional engineer shall prepare an operation and maintenance plan for the stormwater management measures incorporated into the existing stormwater management facilities.
- The maintenance plan shall contain specific preventative maintenance tasks and schedules; cost estimates, including estimated cost of sediment, debris, or trash removal; and the name, address, and telephone number of the person or persons responsible for preventative and corrective maintenance (including replacement). The plan shall contain information on BMP location, design, ownership, maintenance tasks and frequencies, and other details as specified in Chapter 8 of the NJ BMP Manual, as well as the tasks specific to the type of BMP, as described in the applicable chapter containing design specifics.
- If the maintenance plan identifies a person other than the property owner (for example, a developer, a public agency or homeowners’ association) as having the responsibility for maintenance, the plan shall include documentation of such person’s or entity’s agreement to assume this responsibility, or of the owner’s obligation to dedicate a stormwater management facility to such person under an applicable ordinance or regulation.
- Responsibility for maintenance shall not be assigned or transferred to the owner or tenant of an individual property in a residential development or project, unless such owner or tenant owns or leases the entire residential development or project. The individual property owner may be assigned incidental tasks, such as weeding of a green infrastructure BMP, provided the individual agrees to assume these tasks; however, the individual cannot be legally responsible for all of the maintenance required.
- If the party responsible for maintenance identified under Section 254-11B(3) above is not a public agency, the maintenance plan and any future revisions based on Section 254-11B(7) below shall be recorded upon the deed of record for each property on which the maintenance described in the maintenance plan must be undertaken.
- Preventative and corrective maintenance shall be performed to maintain the functional parameters (storage volume, infiltration rates, inflow/outflow capacity, etc.), of the stormwater management measure, including, but not limited to, repairs or replacement to the structure; removal of sediment, debris, or trash; restoration of eroded areas; snow and ice removal; fence repair or replacement; restoration of vegetation; and repair or replacement of non-vegetated linings.
- The party responsible for maintenance identified under Section 254-11B(3) above shall perform all of the following requirements:
- Maintain a detailed log of all preventative and corrective maintenance for the structural stormwater management measures incorporated into the design of the development, including a record of all inspections and copies of all maintenance-related work orders;
- Evaluate the effectiveness of the maintenance plan at least once per year and adjust the plan and the deed as needed; and
- Retain and make available, upon request by any public entity with administrative, health, environmental, or safety authority over the site, the maintenance plan and the documentation required by Section 254-11B(6) and (7) above.
- Obtain a stormwater maintenance permit from the City Engineer by June 30th of each year; and
- On an annual basis, submit to the City Engineer a maintenance and inspection report and certification on a form approved by the City Engineer with all required maintenance logs.
- The requirements of Section 254-11B(3) and (4) do not apply to stormwater management facilities that are dedicated to and accepted by the municipality or another governmental agency, subject to all applicable municipal stormwater general permit conditions, as issued by the Department.
- In the event that the stormwater management facility becomes a danger to public safety or public health, or if it is in need of maintenance or repair, the municipality shall so notify the responsible person in writing. Upon receipt of that notice, the responsible person shall have 14 days to effect maintenance and repair of the facility in a manner that is approved by the municipal engineer or their designee. The municipality, in its discretion, may extend the time allowed for effecting maintenance and repair for good cause. If the responsible person fails or refuses to perform such maintenance and repair, the municipality or County may immediately proceed to do so and shall bill the cost thereof to the responsible person. Nonpayment of such bill may result in a lien on the property.
- A two year maintenance guarantee in accordance with N.J.S.A. 40:55D-53 is required for all stormwater management facilities incorporated into a major or minor development.
- The person responsible for maintenance shall submit an annual inspection report prepared by a professional engineer licensed in New Jersey or a New Jersey certified stormwater inspector to the City Engineer by June 30th of each year. The inspection report and log shall include and not be limited to:
- Detention basin outflow structures, escape provisions as out lined in N.J.A.C. 7:8-6.2 and all components;
- Vegetation;
- Trash racks and overflow grates;
- Embankment erosion; and
- Sediment removal and pond maintenance.
- Copies of checklist requirements for various Stormwater Management BMPs shall be available from the City Clerk.
Nothing in this subsection shall preclude the municipality in which the major development, minor development, or existing Stormwater Management BMP is located from requiring the posting of a performance or maintenance guarantee in accordance with N.J.S.A. 40:55D-53.
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Frequently Asked Questions
What are my post-construction maintenance responsibilities as a property owner in Trenton?
Property owners in Trenton are responsible for maintaining all on-site stormwater facilities and open space areas designated in their approved stormwater management plan. That includes tasks like removing sediment, debris, and trash, restoring eroded areas, keeping up with snow and ice removal, and repairing or replacing fencing around the facility. AQUALIS manages these ongoing maintenance obligations for Trenton property owners, so nothing gets overlooked once a project moves from construction into everyday operation.
What happens if the City of Trenton finds my stormwater facility out of compliance?
The City of Trenton has the authority to inspect properties for stormwater compliance and issue a Notice of Violation when a facility is not being properly maintained. Property owners generally have 14 days to correct the deficiency, and if that doesn’t happen, the city can step in to remediate the issue itself and bill the property owner for the cost. AQUALIS helps Trenton property owners respond to a Notice of Violation quickly, correcting the problem before the city takes remedial action.
Who is responsible for maintaining a stormwater facility once a Trenton development is finished?
Once a project in Trenton receives final approval, responsibility for maintaining the stormwater facility shifts to the property owner, who must keep the system functioning as it was originally designed and permitted. This is an ongoing obligation, not a one-time requirement tied to the construction phase. AQUALIS takes on this long term responsibility for Trenton property owners, providing the routine maintenance and oversight the city expects without the owner having to manage it directly.
Where can I find a single resource for managing my stormwater compliance needs in Trenton?
Between pre-construction planning, structural design standards, ongoing maintenance obligations, and a city inspection and enforcement program that can end in municipal remediation and billing, staying compliant in Trenton involves several moving pieces. AQUALIS offers Trenton property owners a single point of contact for stormwater management, covering maintenance plan development, inspections, Notice of Violation response, and general compliance consulting, so property owners can meet the City of Trenton’s requirements without managing every detail themselves.
The information on this page is provided for general informational purposes only and is not legal advice. Regulations change frequently — AQUALIS makes no warranty as to the accuracy or completeness of this content, and any reliance on it is at your own risk. Consult a qualified professional or your local regulatory authority to confirm requirements applicable to your specific property.



