Environmental Rules in Mercer County, NJ (2026)
2 rules for unincorporated Mercer County, New Jersey.
Verified from official government sources
Stormwater Management
Mercer County Code § 5.03.050 bans diverting stormwater, sump-pump discharge or runoff onto County roadways, gutters, drains, bridges or culverts, and bars any construction that lets dirt or silt accumulate in County drainage facilities. New driveways and roads must also avoid impacting County roadway drainage under § 5.03.030(C)(7), and any storm drain connection needs a separate permit.
Mercer County Right-of-Way Stormwater Rules
Some RestrictionsMercer County Code § 5.03.050(H); § 5.03.050(I); § 5.03.030(C)(7)
Diverting surface, sump pump and other runoff waters to and upon County roadways, rights-of-way, drains, gutters, bridges, and culverts. ... no person, persons, firm, corporation, or municipality shall do or cause to be done any act including the construction of buildings, private or public roadways, grading, landscaping, or otherwise, which shall cause or result in the accumulation of dirt, si...
Erosion Control
Any tie-in to a County drainage structure or storm drain system requires a Mercer County road construction/right-of-way occupancy permit before work starts.
Mercer County storm drain connection permit
Significant RestrictionsMercer County Code § 5.03.030(B)(2)
A RCP/ROWOP shall be required for each approved connection into the County storm drain system, whether the connection is made with a new manhole or inlet, or is connected into an existing storm manhole or inlet. Connections that are not readily visible or are inaccessible are prohibited. (3) A RCP/ROWOP will be required for each new or modified driveway or road intersection encroaching upon ...
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