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Hearing concluded (June 8–18, 2026) — the WQCC's 10-day formal rulemaking hearing has finished; the Commission is now deliberating whether to adopt the NMPDES rules. All NM construction operators are affected.

WQCC Rulemaking Hearing June 8–18, 2026 — What NM Contractors Need to Know

The New Mexico Water Quality Control Commission (WQCC) formal rulemaking hearing for the NMPDES construction stormwater rules was held June 8–18, 2026 and has concluded. The Commission is now deliberating and will decide, at a later date, whether to adopt the rules that set the specific requirements of New Mexico's state-administered permit program under NMAC 20.6.5 (draft). No final decision has been announced; NMR100000 remains in effect meanwhile.

What Is the WQCC?

The Water Quality Control Commission (WQCC) is a New Mexico state regulatory body established under the New Mexico Water Quality Act (§74-6 NMSA 1978). The WQCC is authorized to adopt, amend, and repeal water quality standards and permit regulations for the state of New Mexico. It operates as an independent commission with members appointed by the Governor.

The WQCC has authority to promulgate rules that are equivalent to or more stringent than federal EPA requirements under the Clean Water Act. Under SB21 (2025), the WQCC was directed to adopt rules establishing the New Mexico Pollution Discharge Elimination System (NMPDES) as a state-administered program under NMAC 20.6.5.

Senate Bill 21 — 2025 NM Legislative Session

Senate Bill 21 was passed during the 2025 New Mexico legislative session and signed into law. SB21 granted NMED the statutory authority to administer an NPDES-equivalent construction stormwater permit program. Prior to SB21, New Mexico was one of the few remaining states where EPA Region 6 — not the state — administered construction stormwater permits. NMR100000 was an EPA-issued permit because New Mexico had not previously sought NPDES primacy for construction stormwater.

SB21 directed NMED to:

Petition the WQCC to initiate rulemaking under NMAC 20.6.5
Develop draft rules equivalent to or more stringent than EPA CGP NMR100000
Establish NMED eDMR as the NOI/NOT filing system
Coordinate with EPA Region 6 for administrative continuance during the transition
Provide for a public comment and hearing process before the WQCC

Petition Filed December 9, 2025

NMED filed the formal WQCC petition on December 9, 2025, triggering the rulemaking process. The petition included the draft NMAC 20.6.5 rule text, an economic impact analysis, and supporting technical documentation. The WQCC accepted the petition and scheduled the formal evidentiary hearing for June 8–18, 2026.

The WQCC docket is publicly accessible at env.nm.gov/water-quality-control-commission/. All filings, exhibits, and draft rule text are available in the docket.

Draft NMAC 20.6.5 — Key Provisions

Permit Applicability
Draft NMAC 20.6.5 maintains the 1-acre disturbance threshold and Common Plan of Development provisions equivalent to 40 CFR 122.26(b)(15).
SWPPP Requirements
New Mexico-specific SWPPP provisions expected to address soil erodibility (caliche, sandy loams, alluvial deposits), arroyo drainage systems, and ephemeral waterway buffers.
Inspection Frequency
14-day routine inspections maintained. Draft provisions add state-specific requirements for monsoon season (July 1 – September 30) and ephemeral waterway proximity triggers.
Enforcement
Enforcement authority shifts from EPA Region 6 to NMED Surface Water Quality Bureau. Civil penalties under the NM Water Quality Act may differ from CWA §309 amounts.
NOI/NOT System
Filing transitions from EPA NeT at cdx.epa.gov to NMED eDMR. Transition timeline and account migration procedures to be established post-hearing.
Administrative Continuance
Operators with existing NMR100000 coverage continue under administrative continuance. No permit lapse occurs during the transition. New projects after the NMPDES effective date file directly under state program.

What Contractors Should Do Now

Register for WQCC docket notifications at env.nm.gov/water-quality-control-commission/ — updates are email-based
Download and review the draft NMAC 20.6.5 from the NMED docket
Continue full NMR100000 compliance: 14-day inspections, post-storm visits within 24 hours of ≥0.25"
Update your SWPPP if it doesn't already address arroyo proximity, ephemeral waterway drainage, or monsoon hydrology
Confirm your NOI is current and your operator contact information is up to date in EPA NeT
Monitor the WQCC docket for the Commission's decision — the hearing record is now closed and a ruling is pending
Contact Inspections Plus for a NMPDES transition readiness review — we monitor the docket in real time

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Frequently Asked Questions

Can I attend the WQCC hearing as a contractor?
Yes. The WQCC rulemaking hearing is a public evidentiary proceeding. Contractors, operators, industry groups, and interested parties may attend, submit written comments, and in some cases provide testimony. The WQCC docket at env.nm.gov/water-quality-control-commission/ contains the hearing schedule and participation instructions.
What is the SB21 connection to the WQCC hearing?
Senate Bill 21 (2025 New Mexico legislative session) authorized NMED to administer an NPDES-equivalent program under state law. SB21 directed NMED to petition the WQCC for rulemaking. The December 9, 2025 petition initiated the formal rulemaking process. The June 8–18, 2026 hearing is the evidentiary phase of that process.
What happens if NMPDES rules are not adopted by the WQCC?
If the WQCC does not adopt the NMAC 20.6.5 rules, EPA CGP NMR100000 remains the operative permit. Administrative continuance would extend indefinitely. Inspections Plus monitors the docket and will update clients immediately on any material change to the hearing schedule or outcome.
The hearing has concluded — do I need to do anything now?
No permit action is required while the WQCC deliberates. Continue full NMR100000 compliance under administrative continuance. Reviewing your SWPPP for NM-specific conditions and confirming your NOI is current remains best practice so you're ready if the Commission adopts NMPDES. Contact Inspections Plus for a transition readiness review — we monitor the docket for the ruling.