EPA Construction General Permit (CGP) — Stormwater Discharges
- Record: construction-management-reg-022 — EPA Construction General Permit (CGP) for stormwater discharges from construction activities (NPDES)
- Issuing body / enforcer: U.S. Environmental Protection Agency (EPA); authorized states issue their own CGPs (most construction permitting is state-administered)
- Jurisdiction: United States — where EPA is the NPDES permitting authority (MA, NH, NM, ID, DC, territories, tribal lands, federal facilities); elsewhere the state CGP applies with equivalent-or-stricter terms
- Record type / importance: regulation / license
- Last verified: 2026-09-30
What it is
The Clean Water Act NPDES general permit covering stormwater discharges from construction sites — the permit that makes sediment the most commonly violated pollutant in construction. Rather than individual permits, EPA (and states) issue one general permit; operators obtain coverage by filing a Notice of Intent (NOI). The CGP's core is the Stormwater Pollution Prevention Plan (SWPPP) plus technology-based effluent limits for erosion and sediment control. Cross-link: the mining-specific effluent brief (mining/epa-mining-effluent-40-cfr-440-434.md) and the shared Clean Water Act brief (shared/clean-water-act-npdes.md) cover the NPDES framework this permit operates under.
Scope: who/what it applies to, triggers, thresholds
- Trigger: construction activity disturbing 1 acre or more (or less than 1 acre if part of a larger common plan of development disturbing 1+ acres) with stormwater discharges to waters of the United States.
- Operators who must seek coverage: generally both the owner/developer (operational control over plans) and the general contractor (operational control over day-to-day activities) — dual-operator coverage is the norm and a frequent source of confusion.
- Exclusions/waivers: small sites may qualify for rainfall-erosivity or TMDL-based waivers; linear projects (pipelines, transmission) have tailored provisions.
Key requirements and compliance obligations
- NOI filing before discharge begins (electronic via EPA's NeT system or state equivalent); Notice of Termination (NOT) when the site reaches final stabilization.
- SWPPP: site-specific plan identifying potential pollutant sources, erosion/sediment controls, spill prevention, and the inspection/maintenance program. Must be kept on site and updated as conditions change — an outdated SWPPP is itself a violation.
- Effluent limits: narrative technology-based limits (minimize exposure, maintain controls, manage dewatering discharges) plus numeric turbidity limit of 280 NTU for larger sites discharging to sensitive waters (the 2022 CGP's numeric component — verify applicability thresholds in the current permit).
- Inspections: at the 2022 CGP's frequency (generally every 7 days or every 14 days + within 24h of a 0.25-inch storm — confirm in the current permit), with corrective-action deadlines and documentation.
- Dewatering: specific controls and (for contaminated groundwater) treatment requirements; some dewatering discharges need additional authorization.
- Endangered species and historic preservation: eligibility screening (Criterion A–F species review) is a condition of CGP coverage — a pre-NOI diligence step that delays projects when skipped.
Penalties and consequences
- CWA penalties: civil penalties per violation per day (inflation-adjusted; currently in the tens of thousands per day — verify in 40 CFR Part 19), administrative penalties, and criminal liability for knowing violations.
- Citizen suits under CWA § 505 are a live enforcement vector — environmental groups routinely sue over SWPPP/inspection deficiencies. Stop-work exposure via state enforcement is common.
Version/edition status and LIVE changes (verified 2026-09-30)
- The 2022 CGP (effective Feb 17, 2022) is the current EPA permit, expiring February 16, 2027. EPA will reissue a successor permit — contractors should expect the reissuance process (proposal, comment) to run through 2026–2027. Do not assume the successor's terms; monitor the Federal Register.
- The "waters of the United States" (WOTUS) definition — which determines whether a discharge needs NPDES coverage at all — remains in regulatory flux post-Sackett v. EPA (2023); the conforming rule and ongoing litigation affect jurisdictional determinations. Flag: WOTUS status should be confirmed project-by-project with current agency guidance, not assumed from this brief.
- State CGPs (where EPA is not the authority) have their own reissuance cycles — California's Construction General Permit, for example, operates on its own risk-based (Risk Level 1/2/3) scheme with numeric action levels.
Related certifications (Construction Management flagship/license)
- CCM (construction-management-cert-001): environmental-compliance content within construction management practice.
- No catalogue certification is a stormwater-credential per se; the industry credentials (e.g., CISEC, state QSP/QSD programs) sit outside the flagship tier.
Honest flags
- Numeric turbidity limit details and inspection frequencies should be confirmed against the current permit text — the 2022 CGP's specific provisions are summarized from industry reporting, not quoted from the permit. State-permit variations are deliberately not itemized.
Original ETS reference writing, verified against public sources on 2026-09-30. Thin sourcing is flagged inline. Not legal advice — confirm current editions with the issuing body.