Green Infrastructure Stormwater Management Rules Take Effect in New Jersey

Amendments to New Jersey’s Stormwater Management Rules, N.J.A.C. 7:8, requiring the use of “green infrastructure” measures for stormwater management took effect on March 2, 2021.

Green infrastructure encourages the infiltration of stormwater into the ground, promoting natural filtration of pollutants and sediment and thereby reducing discharge impacts on streams, rivers, and other waterways. The new rules make green infrastructure the preferred and predominant method for managing stormwater for all regulated residential and non-residential projects.

Previously, the state’s Stormwater Management Rule had allowed projects to use traditional engineered structures such as pipes and culverts to manage stormwater, although the Department of Environmental Protection (NJDEP) had encouraged property owners and project proponents to make use of green infrastructure through financial and technical assistance. The rule change formalizes the state’s requirement that new projects implement green infrastructure measures, such as rain gardens, bioretention basins, vegetated swales, pervious paving, and green roofs, as part of project planning and design.

NJDEP adopted amendments to the Stormwater Management Rule on March 2, 2020; the amendments allowed a year before the rule took effect to allow projects in the system to proceed under existing rules, and to allow municipalities to adopt revised local ordinances and to train municipal review staff.

Going forward, any application for a residential development in the state will be reviewed under the revised Stormwater Management rules. Any application for a non-residential project will be reviewed for compliance with the local stormwater control ordinance, which is required under a municipality’s Municipal Separate Storm Sewer System (MS4) permit. Under the MS4 permit, the stormwater control ordinance must be at least as stringent as NJDEP’s Stormwater Management rules.

Additionally, any applications submitted to NJDEP under its Flood Hazard Area, Freshwater Wetlands, and Coastal Zone Management programs will be reviewed by NJDEP under the new rules.

By making green infrastructure a requirement in new development, New Jersey is taking decisive action to advance Governor Murphy’s stated commitment to improving the management of the state’s watersheds.  The change will improve the sustainability of the state’s waterways and will reduce the runoff of harmful pollutants and sediments.