State Waters & NMPDES SWOT Analysis
New Mexico's definition of "waters of the state" is broader than the federal "waters of the United States." It includes ephemeral arroyos and dry washes that flow only after precipitation — which means projects near these features may require NMPDES coverage even where federal NPDES would not apply.
Last updated: May 2026
What Are "Waters of the State"?
Under New Mexico law, waters of the state include all surface and groundwater within the state's boundaries:
This broader definition is central to the NMPDES program — and especially relevant after the Sackett decision narrowed federal jurisdiction over isolated and ephemeral waters.
SWOT Analysis of the NMPDES Program
Strengths
- • Local administration with knowledge of NM-specific conditions
- • Faster permit processing than EPA Region 6
- • Broader protection of state waters, including ephemeral streams
- • Tailored BMP guidance for arid/semi-arid environments
Weaknesses
- • Limited state funding and staffing compared to EPA resources
- • Fewer enforcement actions historically than the federal program
- • Rural areas may have limited compliance assistance
Opportunities
- • Integration with state water planning and conservation efforts
- • Better coordination with tribal water quality programs
- • Modernization of e-permitting and digital compliance tools
- • Enhanced monsoon-season BMP requirements
Threats
- • Budget constraints affecting program capacity
- • Climate change increasing extreme precipitation events
- • Federal regulatory changes affecting delegated programs
- • Expanding development in water-stressed areas
Frequently Asked Questions
How does New Mexico define "waters of the state"?
New Mexico defines waters of the state more broadly than the federal waters of the United States. It includes all surface and groundwater within the state's boundaries — including ephemeral arroyos and dry washes that flow only during and immediately after precipitation.
Can a project need NMPDES coverage where federal NPDES would not apply?
Yes. Because the state definition covers ephemeral arroyos and dry washes, projects near these features may require NMPDES coverage even where federal NPDES would not apply.
Why does the broader state definition matter after the Sackett decision?
The Sackett decision narrowed federal jurisdiction over isolated and ephemeral waters. New Mexico's broader definition of waters of the state remains central to the NMPDES program, so coverage can still apply to those features at the state level.
What are the strengths of the NMPDES program?
Strengths include local administration with knowledge of NM-specific conditions, faster permit processing than EPA Region 6, broader protection of state waters including ephemeral streams, and tailored BMP guidance for arid and semi-arid environments.
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