NMPDES Construction General Permit 2026: NOI, Coverage, and Compliance Guide
Everything construction operators in New Mexico need to know about NMPDES coverage, Notice of Intent submission, SWPPP requirements, and the upcoming 2026 rule changes.
Terms used in these guides(19 terms, plain-language definitions)
- SWPPP — Stormwater Pollution Prevention Plan
- The written plan describing how a site keeps dirt, concrete washout, fuel and other pollutants out of storm drains and streams.
- BMP — Best Management Practice
- A physical control or work practice that reduces pollution in runoff, such as silt fence, a gravel construction entrance or covered stockpiles.
- NOI — Notice of Intent
- The form an operator files to request coverage under a general stormwater permit before ground is disturbed.
- NOT — Notice of Termination
- The form filed when a site is finished and stabilized, ending permit coverage.
- CGP — Construction General Permit
- The stormwater permit that covers construction sites, issued by EPA or a state program.
- MSGP — Multi-Sector General Permit
- The stormwater permit that covers operating industrial facilities, as opposed to construction sites.
- NPDES — National Pollutant Discharge Elimination System
- The federal Clean Water Act program under which stormwater permits are issued.
- NMPDES — New Mexico Pollutant Discharge Elimination System
- New Mexico's state-run version of the NPDES program.
- AZPDES — Arizona Pollutant Discharge Elimination System
- Arizona's state-run version of the NPDES program, administered by ADEQ.
- TPDES — Texas Pollutant Discharge Elimination System
- Texas's state-run version of the NPDES program.
- EPA — United States Environmental Protection Agency
- The federal agency that writes the NPDES rules and issues permits where a state has not taken over the program.
- NMED — New Mexico Environment Department
- The state agency responsible for water quality in New Mexico.
- ADEQ — Arizona Department of Environmental Quality
- The state agency that runs the AZPDES program.
- WQCC — Water Quality Control Commission
- The New Mexico body that adopts the state's water quality rules.
- PE — Professional Engineer
- A licensed engineer; some plans or certifications must be prepared or stamped by one.
- E&O — Errors and Omissions insurance
- Professional liability insurance a consultant carries against mistakes in their work.
- Discharge
- Water leaving a site, typically stormwater runoff that reaches a storm drain, ditch or stream.
- Outfall
- The point where runoff leaves a site or enters a water body.
- Stabilization — Final stabilization
- Covering exposed soil with vegetation, pavement or other permanent cover so it no longer erodes; usually the condition for ending permit coverage.
NMPDES Construction General Permit: The Complete 2026 Operator Guide
If you are conducting construction activity in New Mexico that disturbs one acre or more of land -- or less than one acre if you are part of a larger common plan of development -- you are required to obtain coverage under the New Mexico Pollutant Discharge Elimination System (NMPDES) Construction General Permit (CGP) before breaking ground.
Failure to obtain permit coverage before commencement of land disturbance is a strict-liability violation of the New Mexico Water Quality Act. NMED does not require proof of discharge to issue a Notice of Violation -- the act of disturbing land without active permit coverage is itself the violation.
This guide covers every step of the coverage process as it stands in 2026, including the administrative continuance status of the current permit, the upcoming WQCC rulemaking, and the practical compliance obligations you carry once coverage is in effect.
Who Administers NMPDES?
New Mexico operates a delegated NPDES program. Rather than EPA administering permit requirements directly (as it does in states without delegation), the New Mexico Environment Department (NMED) Surface Water Quality Bureau administers the state's construction stormwater program under NMPDES authority.
This delegation means:
- New Mexico's permit conditions can be more stringent than federal CGP standards, but not less
- EPA retains oversight authority and can assert federal jurisdiction in certain circumstances
- Changes to New Mexico's permit rules go through the Water Quality Control Commission (WQCC), not EPA rulemaking
The current NMPDES Construction General Permit operates under administrative continuance -- the permit term has expired, but NMED has extended coverage for operators who held valid coverage at expiration, while the new permit language undergoes the WQCC rulemaking process scheduled for June 2026.
Step-by-Step: How to Obtain NMPDES Construction Coverage
Step 1: Determine If You Need Coverage
You need NMPDES construction CGP coverage if your project involves:
- Land disturbance of 1 acre or more
- Land disturbance of less than 1 acre that is part of a larger common plan of development that will ultimately disturb 1+ acres
- Any construction activity within 300 feet of a waterbody in certain sensitive watersheds (check NMED maps)
Exemptions exist for agricultural land-disturbing activities not involving NPDES-regulated point sources, routine road maintenance, and emergency response activities. These exemptions are narrow and operators frequently over-apply them.
Step 2: Develop Your SWPPP Before Filing the NOI
This is the step most operators get wrong. Under NMPDES, your Stormwater Pollution Prevention Plan (SWPPP) must be completed and on-site before you submit your Notice of Intent, not developed afterward. Your NOI references the SWPPP; it does not trigger its creation.
Your SWPPP must include at minimum:
- Site description, including drainage patterns and receiving water(s)
- Identification of all potential pollutant sources (concrete washout, fueling areas, stockpiles, demolition debris)
- Description of all BMPs to be implemented, with installation timeline
- Maps showing BMP locations, drainage patterns, and points of discharge
- Inspection and maintenance schedule for each BMP
- Amendment procedures and responsible party identification
- Subcontractor training and certification documentation
For New Mexico specifically, your SWPPP must identify whether any receiving waters are designated Outstanding National Resource Waters (ONRWs) or 303(d)-listed impaired waters, as these trigger enhanced requirements.
Step 3: Submit Your Notice of Intent (NOI)
New Mexico NOIs are submitted through NMED's online ePASS system (Environment Portal and Automated Submission System). Paper NOIs are no longer accepted for most construction projects.
Required information on the NOI:
- Operator name, address, and contact information
- Project name, location (legal description + coordinates), and acreage of disturbance
- Receiving water name and whether it is listed as impaired
- Estimated start date and projected construction completion date
- Certification signature of a responsible corporate officer
NOI Processing Time: Currently 7-14 business days for standard projects. Projects adjacent to impaired waters or ONRWs may require additional review time.
NOI Fee: Approximately $200 for projects under 10 acres; $500 for projects 10 acres and above. Confirm current fees directly with NMED as they are subject to legislative adjustment.
Step 4: Receive Your Permit Coverage Acknowledgment
NMED issues a written acknowledgment confirming your permit coverage number. This NMPDES permit number must be:
- Posted at the construction site entrance
- Referenced in all SWPPP documentation
- Included on any correspondence with NMED regarding the project
Do not begin land disturbance until you have this acknowledgment in hand.
Step 5: Implement BMPs and Begin the Inspection Program
Once coverage is active, you are legally obligated to:
- Install all BMPs identified in the SWPPP before land disturbance begins
- Conduct inspections at the required frequency (currently every 14 calendar days AND within 24 hours of a 0.5-inch or greater precipitation event)
- Document every inspection in writing with date, time, inspector name, conditions observed, and corrective actions taken
- Maintain inspection records on-site and available for NMED inspection at all times
- Amend the SWPPP within 7 days of any material change to site conditions
Step 6: File Your Notice of Termination (NOT) When Construction Is Complete
Your permit coverage does not automatically terminate when construction ends. You must file a Notice of Termination through ePASS within 30 days of meeting all termination conditions:
- Final stabilization achieved on all disturbed areas (70% perennial vegetative cover; or 70% of pre-disturbance native species for arid/semi-arid areas in NM)
- All temporary BMPs removed and disposal documented
- Permanent stormwater controls installed and operational
- No further potential for pollutant discharge from the site
Failing to file the NOT leaves your coverage active and your inspection obligations ongoing -- a common compliance gap that triggers NMED notices of violation months after a project is complete.
Common NMPDES Compliance Failures and How to Avoid Them
| Failure Mode | Trigger | Prevention |
|---|---|---|
| No permit coverage before grading | Immediate NOV | Submit NOI minimum 10 business days before planned start |
| SWPPP not on site | Inspector site visit | Maintain physical AND digital copy on site at all times |
| Missed post-storm inspection | 0.5 inch rain event, no documentation | Set automated weather alerts keyed to site coordinates |
| Expired BMP (silt fence failure) | Routine or storm inspection | Weekly visual checks; replace before failure, not after |
| Subcontractor not in SWPPP | Grading sub hired after SWPPP completion | Mandatory SWPPP amendment before sub commences work |
| NOT not filed | Project complete, coverage still active | Calendar reminder: file NOT within 30 days of final stabilization |
2026 Administrative Continuance: What It Means for Active Permits
The NMPDES Construction General Permit is currently operating under administrative continuance. This means:
- Operators who had valid coverage at the permit expiration date retain their coverage automatically -- no action required.
- New projects filing NOIs now are covered under the administratively continued permit conditions -- the existing CGP terms apply.
- The new permit terms being developed through the June 2026 WQCC rulemaking will apply to new NOIs filed after the new permit's effective date.
For operators filing NOIs today: expect to revisit your SWPPP and inspection program within 6-12 months of the new permit taking effect. Build that review into your project schedule and budget now.
NMPDES vs. Federal CGP: Critical Differences
New Mexico's NMPDES program imposes several requirements that differ from or exceed the federal EPA Construction General Permit:
- Arid/semi-arid stabilization standard: NM requires 70% of pre-disturbance native species density for final stabilization in arid areas -- a much higher bar than many operators realize, particularly in the Rio Grande basin.
- Concrete washout: NM prohibits discharge of concrete washout water to any surface water or stormwater conveyance -- more stringent than federal language.
- Dewatering: Construction dewatering that will discharge to surface water requires a separate NMPDES permit, not just SWPPP documentation -- a common oversight on excavation-heavy projects.
- Endangered species consultation: Projects in habitat for federally or state-listed species may require NMED coordination before NOI approval.
Get Expert Help With Your NMPDES Coverage
Navigating NMPDES correctly — from SWPPP development through the final NOT — requires domain expertise that most general contractors and developers don't keep in-house. SWPPP HUB's verified network includes consultants with documented NMPDES experience covering SWPPP preparation, NOI submission, inspection programs, SWPPP amendments, and NOT preparation.
Get matched with a verified New Mexico SWPPP consultant → or see the full New Mexico SWPPP requirements guide.
Related Resources
Authoritative sources
This guide is education, not advice. The permit text and the agency that administers it are the final word.
- U.S. EPA:Construction General Permit (CGP)
- U.S. EPA:Multi-Sector General Permit (MSGP) for industrial stormwater
- New Mexico Environment Department:Surface Water Quality Bureau
- Arizona Department of Environmental Quality:AZPDES stormwater program
What next, and who is responsible
The permit holds the operator responsible: whoever controls the construction plans or the day-to-day work on the ground, which is usually the general contractor and often the owner as well. A landowner who has hired others to build is still named on the permit whenever they control the plans, so confirm who is filing before ground is disturbed.