EPA CGP 2022 Requirements Summary — NMR100000 Quick Reference
The EPA Construction General Permit (CGP) 2022 governs construction stormwater in New Mexico under permit identifier NMR100000. It became effective February 17, 2022 and expires February 16, 2027, subject to the NMPDES transition. This page summarizes key requirements.
Last updated: April 2026
NOI Filing Requirements
An NOI must be filed and acknowledged before any soil disturbance begins on a project requiring NMR100000 permit coverage. Filing is electronic through EPA NeT at cdx.epa.gov.
Required SWPPP Contents (CGP Part III)
Inspection Schedule
| Trigger | Frequency | Notes |
|---|---|---|
| Routine | Every 14 calendar days | Any day within the 14-day window; document inspection date and weather conditions |
| Post-Storm (NMR100000) | Within 24 hours of ≥ 0.25" rain event | Triggered by storm event — inspect all BMPs and document findings |
| Post-Storm (AZPDES) | Within 24 hours of ≥ 0.50" rain event | Arizona-specific trigger — different from NMR100000 |
| Inspection Waiver (Frozen) | 14-day waiver available when ground is frozen | Document frozen conditions — waiver applies to routine, not post-storm |
Corrective Action Requirements
Notice of Termination (NOT) Requirements
The NOT terminates permit coverage. Operators must not file the NOT until all requirements are met. Filing a premature NOT while construction is still active is a permit violation.
Penalties for Noncompliance
Under Clean Water Act Section 309(d) (33 U.S.C. § 1319(d)), civil penalties for NPDES permit violations can reach up to $68,445 per day per violation, as adjusted for inflation at 40 C.F.R. § 19.4 (effective Jan. 8, 2025; 90 Fed. Reg. 1377). Criminal violations for knowing or willful noncompliance carry additional penalties. EPA Region 6 and NMED both have active enforcement programs for NMR100000 violations. The most common enforcement triggers: operating without an acknowledged NOI, missing inspection intervals, and inadequate BMP maintenance.
Frequently asked questions
When did EPA CGP 2022 take effect and when does it expire?
The EPA Construction General Permit 2022 became effective February 17, 2022 and expires February 16, 2027, subject to the NMPDES transition. It governs construction stormwater in New Mexico under permit identifier NMR100000.
When must an NOI be filed under NMR100000?
An NOI must be filed and acknowledged before any soil disturbance begins. File electronically through EPA NeT at cdx.epa.gov, and post the acknowledgment letter at the construction entrance before ground disturbance.
How often are inspections required under CGP 2022?
Routine inspections are required every 14 calendar days, plus post-storm inspections within 24 hours of a 0.25-inch rain event under NMR100000 (or a 0.50-inch event under AZPDES).
When must a Notice of Termination (NOT) be filed?
The NOT must be filed within 30 days of achieving final stabilization — generally 70% perennial vegetative cover across all disturbed areas — through EPA NeT at cdx.epa.gov, the same system as the NOI.
How quickly must a SWPPP be amended after a change?
The SWPPP must be amended within 7 calendar days of any change in site conditions or BMP design.
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