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NMPDES Dual Permit Period 2026 — Operating Under Administrative Continuance

During 2026, New Mexico construction operators must maintain EPA CGP NMR100000 compliance while monitoring the NMPDES transition. The MSGP 2021 expired February 28, 2026 and is under federal administrative continuance. Operators may need to file under both programs during the transition window.

Last updated: April 2026

What Administrative Continuance Means

Administrative continuance is a legal doctrine that allows existing permit coverage to remain valid when a permit expires or when permit authority transitions between agencies — provided the permittee continues to comply with existing permit conditions and timely applies for renewal or transfer. Under administrative continuance:

Permit coverage does not lapse — the operator remains legally covered
All existing permit conditions (inspection frequency, SWPPP requirements, reporting) remain in full force
No new fees or applications are required during the continuance window
Coverage continues until the new permit is formally issued and in effect

Current Permit Status — 2026

NMR100000 Remains in Force
EPA CGP NMR100000 became effective February 17, 2022 and is valid through February 16, 2027. This permit continues to govern all NM construction stormwater until NMPDES is formally issued by NMED.
MSGP 2021 Under Federal Continuance
The Multi-Sector General Permit (MSGP) 2021 expired February 28, 2026. Industrial facilities with stormwater exposure continue under EPA federal administrative continuance — coverage does not lapse. Operators must maintain full MSGP compliance.
No Lapse for Currently Permitted Operators
Operators with acknowledged NOIs under NMR100000 do not lose coverage during the NMPDES transition. Administrative continuance is automatic. No re-filing or new NOI is required until NMPDES formally takes effect.
New Projects During Transition
Construction projects initiating ground disturbance during the dual-permit window continue to file NOIs through EPA NeT at cdx.epa.gov under NMR100000. Once NMPDES takes effect, new projects file through NMED eDMR.
Dual Compliance Window
Between the WQCC hearing (June 8–18, 2026) and the NMPDES effective date, some operators may face dual compliance requirements if NMED establishes interim guidance. Inspections Plus monitors all NMED guidance updates.
Important: Continuance Is Not a Compliance HolidayAdministrative continuance means coverage continues — it does NOT mean compliance obligations are suspended. Every NMR100000 inspection requirement, SWPPP amendment duty, and reporting obligation continues in full during the transition. NMED and EPA both retain enforcement authority during the dual-permit window.

Required Actions During the Transition Window

Continue 14-day routine inspections under NMR100000
Conduct post-storm inspections within 24 hours of ≥0.25" rain events
Maintain inspection reports on site and available for regulatory review
Amend SWPPP within 7 days of any change in site conditions
File NOT within 30 days of final stabilization (70% perennial cover)
Retain records for 3 years after NOT filing
Monitor NMED docket for NMPDES effective date and transition guidance
Watch for NMED guidance on NOI transfer procedures to eDMR

How Inspections Plus Handles the Transition

Inspections Plus monitors the WQCC and NMED dockets in real time. For all active clients, we:

·Track the NMPDES effective date and notify clients immediately upon WQCC adoption
·Update all active SWPPPs to reflect NMPDES provisions when rules are finalized
·Handle NOI transfer from EPA NeT to NMED eDMR as directed by NMED guidance
·Provide written transition checklist to each client before the effective date
·Maintain dual-compliance documentation during any overlap window
NMR100000 vs. NMPDES comparison →NOI filing transition →MSGP 2021 continuance details →

Frequently Asked Questions

Does EPA CGP NMR100000 remain valid during the NMPDES transition?

Yes. EPA CGP NMR100000 became effective February 17, 2022 and is valid through February 16, 2027. It continues to govern all NM construction stormwater until NMPDES is formally issued by NMED.

Did stormwater coverage lapse when the MSGP 2021 expired?

No. The MSGP 2021 expired February 28, 2026, but industrial facilities with stormwater exposure continue under EPA federal administrative continuance — coverage does not lapse, and operators must maintain full MSGP compliance.

Do currently permitted operators need to re-file during the transition?

No. Operators with acknowledged NOIs under NMR100000 do not lose coverage during the NMPDES transition. Administrative continuance is automatic, and no re-filing or new NOI is required until NMPDES formally takes effect.

Does administrative continuance suspend compliance obligations?

No. Continuance means coverage continues — it does not suspend compliance. Every NMR100000 inspection requirement, SWPPP amendment duty, and reporting obligation remains in full force, and NMED and EPA both retain enforcement authority.

Where do new construction projects file NOIs during the dual-permit window?

New projects that initiate ground disturbance during the transition continue to file NOIs through EPA NeT at cdx.epa.gov under NMR100000. Once NMPDES takes effect, new projects file through NMED eDMR.

Related resources

NMPDES GuideNew Mexico's stormwater permit program and the transition from federal NPDES.MSGP 2021 ContinuanceIndustrial stormwater coverage under federal administrative continuance.CGP vs. MSGPHow construction and industrial general permits differ.Stormwater InspectionsRoutine and post-storm inspection requirements under NMR100000.

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