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Stormwater and water quality

Stormwater management, discharge permits, sewage planning and water quality certifications. What changed, the rules that apply and the dates ahead for projects in New Jersey, New York, Connecticut and Pennsylvania.

Latest briefings

  1. HighNew JerseyFree to read

    New Jersey adopts one-year extension letting complete applications use its older land-use rules until July 2027

    Applications the state declares administratively and technically complete before July 20, 2027 will be reviewed under the pre-2026 land-use rules rather than the climate-adjusted flood standards.

    FinalWetlands & floodingStormwater & water quality
  2. MediumKings County, NY

    New York proposes higher water quality classification for Newtown Creek; comments due in late November

    The proposal moves the creek from Class SD to Class I; the State Register notice says comments close five days after the last hearing, so owners and applicants along the creek should confirm the deadline.

    ProposedStormwater & water quality
  3. MediumNew York

    Federal: Rule narrowing state review of federal water permits reportedly cleared White House review

    EPA's January 2026 proposal would limit state water quality certification to the discharge and cut the information states may require. A final rule reportedly cleared OMB review September 4, 2026; no publication was found. The 2023 rule remains in effect.

    ProposedStormwater & water quality
  4. MediumPennsylvania

    Pennsylvania: DEP drafts revised small-site construction stormwater permit with new municipal certification route

    A draft revision of PAG-01, which DEP reports was published August 22, 2026 with comments closed September 21, would align it with PAG-02 and add a municipal certification route with no impervious-area limits. DEP estimates issuance in January 2027 and effect March 1, 2027.

    ProposedStormwater & water quality
  5. MediumNew York

    New York's water permit for Raritan Bay gas pipeline survives federal appeal as New Jersey's falls

    A federal appeals court upheld New York's conditional water quality certification for the Northeast Supply Enhancement pipeline, weeks before another appeals court voided New Jersey's certification for the same project.

    In courtEnergy & gridStormwater & water quality
  6. MediumPhiladelphia County, PA

    Pennsylvania: Philadelphia exempts small homes from stormwater rules and widens its maximum release-rate zones

    Since July 1, 2026, one- and two-family projects disturbing under one acre are exempt from Philadelphia's post-construction stormwater rules, release-rate zones are larger, and sites of 5,000 square feet or more need approved erosion plans. Guidance Manual 3.4 took effect the same day.

    LocalStormwater & water qualityHousing
  7. MediumNew York

    New York proposes requiring active landfills to treat leachate before disposal, with phase-in to four years

    DEC's proposed amendments to its solid waste rules would require treatment of leachate at 32 active landfills before it goes to wastewater plants or other discharge, with plans due one and two years after the effective date. Comments closed September 9, 2026. The proposal is not in force.

    ProposedContamination & cleanupStormwater & water quality
  8. MediumFairfield County, CT

    Connecticut appeals court affirms ruling that Wilton sewer authority acted arbitrarily in denying 70-unit project

    On May 26, 2026 the Appellate Court affirmed a judgment that Wilton's sewer authority acted arbitrarily in denying a 70-unit project, because its capacity finding rested on a hypothetical flow and the applicant had no chance to respond to its ownership objections. The matter was remanded for approval with conditions.

    In courtHousingZoning & land useStormwater & water quality
  9. MediumConnecticut

    Connecticut reissues dewatering and cleanup wastewater permit; new sites must apply 180 days before discharging

    The state's general permit for dewatering and remediation wastewater took effect March 1, 2026 and runs to February 28, 2031. New sites apply 180 days before discharge and file coastal, wildlife and treatment documents. A related draft general permit was withdrawn on July 15, 2026.

    FinalStormwater & water qualityContamination & cleanup

Rules 22

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