First-Time NMPDES Permittees Guide
Getting your first stormwater permit in New Mexico breaks down into six clear steps: determine if you need coverage, file your Notice of Intent, develop your SWPPP, install BMPs before breaking ground, inspect on schedule, and file your Notice of Termination at final stabilization. This guide walks through each one — and flags what changes as the state transitions from EPA permitting to NMPDES.
Determine If You Need Coverage
- Construction activity disturbing 1 acre or more (or part of a larger common plan of development)
- Industrial activity with stormwater exposure as defined by your sector / SIC code
- Any discharge to waters of the state, including ephemeral arroyos and dry washes
File a Notice of Intent (NOI)
Today, construction NOIs in New Mexico are filed through EPA's NeT system at cdx.epa.gov under CGP NMR100000 — you must wait for authorization after EPA posts your NOI before disturbing ground. Once NMED formally issues NMPDES after the WQCC hearing, new NOIs will move to the NMED eDMR system. Either way, file well before your planned start date and keep the authorization on site.
Develop Your SWPPP
Your Stormwater Pollution Prevention Plan must be complete before construction starts. It should include:
- Site description and construction activity overview
- Receiving waters and potential pollutant sources
- Erosion and sediment control BMPs
- Good housekeeping practices
- Inspection and maintenance procedures
- SWPPP amendment log
Install BMPs Before Breaking Ground
All perimeter and initial BMPs must be in place before land disturbance begins. In New Mexico's arid climate, pay special attention to fugitive dust control (CABQ requires a dust permit at 0.75 acres), inlet protection near arroyos, and stabilization of steep slopes ahead of monsoon-season storms.
Conduct Regular Inspections
Under CGP NMR100000, inspect your site and BMPs at least every 14 calendar days and within 24 hours of a storm event producing 0.25 inches or more of rainfall. Document every inspection and corrective action, and keep records available on site for regulatory review.
File the Notice of Termination (NOT)
Once final stabilization is achieved (70% of pre-disturbance perennial vegetative cover or equivalent permanent stabilization), file your NOT to close out coverage and end your inspection obligations. Failure to file the NOT is a common violation — it leaves coverage and inspection duties active after the project is physically complete.
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