Identify the applicable dewatering discharge permit for construction excavation groundwater

Steps

1. Understand that dewatering (temporary groundwater pumping during excavation) can sometimes be covered under a state's construction stormwater general permit, but is often regulated separately when groundwater — not just accumulated stormwater — is discharged.
2. For Massachusetts and New Hampshire, note the original Dewatering General Permit (DGP) was terminated March 31, 2023 and replaced by the combined 2022 Dewatering and Remediation General Permit (DRGP), effective August 2, 2022 (permit numbers MAG910000 / NHG910000) — do not cite the old DGP as currently active.
3. For Florida, check DEP's construction-with-dewatering guidance (floridadep.gov/water/stormwater/content/construction-dewatering-faq): dewatering BMPs can sometimes be covered under the general construction stormwater permit if criteria are met, otherwise a separate DEP District dewatering permit is required.
4. Before assuming coverage, verify the specific state permit's criteria (discharge volume, treatment/BMP requirements, receiving water) since coverage thresholds vary by state and are not automatic.