EPA MSGP 2026 Administrative Continuance: What Industrial Stormwater Operators Must Do Now

The 2021 EPA MSGP Expired February 28, 2026 -- Here Is Exactly What Happens Next

The EPA Multi-Sector General Permit (MSGP) for industrial stormwater discharges -- the permit covering an estimated 40,000+ industrial facilities across EPA-administered states -- expired on February 28, 2026. As of March 2026, EPA has not issued the new MSGP. The permit is operating under administrative continuance.

This situation creates significant regulatory ambiguity for industrial operators. Understanding administrative continuance -- what it preserves, what it does not, and what you must do -- is non-negotiable.

What Is Administrative Continuance?

Administrative continuance (sometimes called permit continuation or permit holdover) is a legal mechanism under the Clean Water Act that preserves the regulatory status quo when a permit expires before its successor is issued. Under 40 CFR Part 122.6, when an NPDES permittee submits a complete and timely renewal application and EPA has not issued the new permit by the expiration date, the existing permit terms continue in full force until the new permit is issued.

Key operative word: timely. Administrative continuance protection applies ONLY to permittees who:

Held valid MSGP coverage at the February 28, 2026 expiration date
Submitted a renewal NOI (or will re-submit under the new permit within the submission window EPA establishes)
Are operating under the same sector and facility conditions as covered in the expired permit

If you did not have active MSGP coverage before February 28, 2026, you cannot get covered under the administratively continued permit. You are an unpermitted discharger until EPA issues the new MSGP and you submit a valid NOI under that permit.

What Changes (and Does Not Change) Under Administrative Continuance

What Stays the Same

All effluent limits and numeric benchmarks from the 2021 MSGP remain in effect
All inspection requirements (quarterly visual observations, annual comprehensive evaluations) continue unchanged
All SWPPP requirements, including the obligation to review and certify the SWPPP annually, remain active
All monitoring and sampling obligations (sector-specific) continue
All recordkeeping and reporting requirements continue
Benchmark exceedances still trigger Tier 1 and Tier 2 corrective action requirements

What Is Uncertain

The timeline for new MSGP issuance (EPA has not published a final target date as of March 2026)
Whether the new MSGP will change numeric benchmarks, monitoring frequency, or sector-specific requirements
Whether operators in sectors being restructured will face transition requirements

Key 2021 MSGP Requirements Still in Effect

Stormwater Pollution Prevention Plan (SWPPP)

Every covered facility must maintain a SWPPP that:

Identifies all pollutant sources and potential exposure areas
Describes BMPs for each source
Includes site maps
Is reviewed and recertified at least annually
Is amended within 30 days of material changes to facility operations

Inspection Program

Quarterly visual observations of all stormwater discharge points during active discharge events (at least one per quarter)
Annual comprehensive site compliance evaluations by a qualified individual, covering the entire facility, all BMPs, and the SWPPP
All inspections documented with date, time, inspector name, discharge appearance, corrective actions

Monitoring Requirements

Sector-specific. Most sectors require benchmark monitoring (chemical or physical parameter testing) of stormwater samples collected quarterly during the first four quarters of permit coverage, then semi-annually thereafter. Benchmark exceedances trigger Tier 1 (investigate, implement corrective action) and Tier 2 (implement NAL exceedance response action plan) requirements.

Electronic Reporting

All DMRs (Discharge Monitoring Reports) and annual reports must be submitted electronically through EPA's NPDES Electronic Reporting Tool (NeT-MSGP). Paper reporting is not an option.

New Mexico Industrial Operators: NMPDES and MSGP Interaction

New Mexico operates a delegated NPDES program for construction stormwater but does NOT have delegation for the industrial MSGP sector. This means:

Construction activity (disturbing 1+ acres) at an industrial facility in NM requires NMPDES Construction CGP coverage (administered by NMED)
Industrial stormwater from the industrial operations themselves (vehicle maintenance, materials storage, process areas) -- many sectors are covered under the federal EPA MSGP directly
Some New Mexico industrial facilities need BOTH permits simultaneously

This dual-permit scenario is common for manufacturing facilities, mining operations, recycling yards, and transportation equipment maintenance facilities that also have on-site construction activity.

What Industrial Operators Should Do Right Now

1. Confirm Your Administrative Continuance Status

Log into EPA's NPDES Electronic Reporting system and verify your facility's permit status. If your permit status shows "Administratively Continued" or "Active under Administrative Continuance," you are protected. If your permit lapsed before you submitted a renewal, contact your EPA Region office immediately.

2. Do Not Reduce Your Compliance Activity

Administrative continuance is NOT a compliance holiday. Enforcement continues under the expired permit terms. Do not skip inspections, defer SWPPP updates, or delay responding to benchmark exceedances because the permit has expired.

3. Review Your SWPPP for 2026 Readiness

Use this period to update your SWPPP to reflect current facility conditions. Many facilities have undergone operational changes since 2021 that are not reflected in their SWPPP. An outdated SWPPP under an active inspection is a violation waiting to happen.

4. Monitor EPA for New Permit Issuance

EPA will announce the new MSGP through the Federal Register and update the NPDES stormwater website. Once the new permit is issued, there will typically be a 90-day window to submit a new NOI. Monitor this closely -- the submission window opens and closes quickly.

5. Budget for Confirmed Requirement Changes in the 2026 MSGP

EPA's December 2024 proposal confirmed three major cost-drivers in the 2026 permit. Budget now:

PFAS monitoring program — lab costs for EPA Method 1633 analysis of 40 PFAS compounds
Increased benchmark sampling — quarterly sampling for the first three full years of new permit coverage (up from quarterly only in years 1 and 4 under 2021 MSGP)
SWPPP climate resilience documentation — new requirement to document facility vulnerability to increased storm events using FEMA, NOAA, or USGS flood mapping data

EPA estimates incremental compliance cost at approximately $4,670 per facility per year under the proposed 2026 MSGP.

What Is Changing in the 2026 MSGP

EPA published the proposed 2026 MSGP on December 13, 2024 (Federal Register docket EPA-HQ-OW-2024-0481). The public comment period closed May 19, 2025. The permit is currently in final review. Key changes from the 2021 MSGP:

PFAS Monitoring (New — 23 Sectors)

The most significant new requirement. Sectors A, B, C, D, F, I, K, L, M, N, P, R, S, T, U, V, W, X, Y, Z, AA, AB, and AC must conduct report-only PFAS monitoring using EPA Method 1633 for 40 PFAS compounds for the full five-year permit term. No benchmarks are established yet — EPA is collecting baseline data to inform future rulemaking. "Report-only" does not mean you can ignore the results; exceedances above health advisory levels will draw scrutiny.

Benchmark Monitoring Frequency Increase

The 2021 MSGP required quarterly benchmark monitoring in permit years 1 and 4, semi-annually otherwise. The proposed 2026 MSGP requires quarterly monitoring for the first three consecutive years (or until 12 quarters of data are collected). This is a significant increase in lab and sampling costs for sectors with multiple outfalls.

New benchmark monitoring is proposed for:

Ammonia, nitrate, and nitrite — subsector I1 (vehicle maintenance areas)
pH, TSS, and COD — several sectors upgraded from report-only indicator to benchmark status
Metals monitoring — new requirements across several subsectors

Climate Resilience Provisions

Operators must document how their stormwater control measures are designed to withstand projected future weather conditions. Required steps:

Consult FEMA Flood Maps, NOAA precipitation frequency data, or USGS stream gauge data to assess site flood vulnerability
Assess whether increased storm frequency or intensity affects BMP effectiveness
Adjust maintenance schedules accordingly
Document all of the above in the SWPPP

Impaired Waters Monitoring Expansion

Quarterly monitoring required for all relevant pollutants when discharging to waters on the 303(d) impaired waters list — regardless of whether a TMDL has been established.

New Visual Discharge Standard

Discharges must not contain or result in observable floating solids, scum, sheen, foam, or discoloration. This adds a specific enforceable visual standard that did not exist in the 2021 MSGP.

Official Proposed 2026 MSGP Documents

Enforcement Risk During Administrative Continuance

EPA Region 6 (covering New Mexico, Texas, Oklahoma, Arkansas, and Louisiana) has been active in MSGP enforcement. Recent enforcement actions have included civil penalty assessments for failure to conduct quarterly visual observations, NOVs for SWPPPs not updated to reflect current facility conditions, and penalty settlements in the $50,000-$250,000 range for multi-year, multi-violation situations.

The transition period around permit expiration is actually a higher-risk enforcement window, not lower -- inspectors know operators may be confused about their obligations and use inspection sweeps to identify non-compliant facilities.

Industrial Stormwater Compliance Support

SWPPP HUB's verified network includes consultants with MSGP compliance experience across multiple industrial sectors — SWPPP review and annual certification, quarterly visual observation inspections, annual comprehensive evaluations, benchmark monitoring and sampling, and NOI submission support for the new MSGP once issued. Every consultant is verified for active credentials and documented industrial stormwater experience before listing.

Get matched with a verified industrial stormwater consultant → or review requirements at the SWPPP requirements library.

Related Resources

Official EPA Sources

SWPPP HUB Guides