New Mexico Towns Face Updated Storm Sewer Rules
Published Date: 3/4/2026
Notice
Summary
The EPA is proposing a new permit for cities and towns in New Mexico to better manage stormwater pollution from their sewer systems. This affects urban areas and requires them to follow updated rules to keep water clean. You’ve got until May 4, 2026, to share your thoughts, so don’t miss your chance to weigh in!
Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
New Mexico MS4 Permit Covers Urban Areas
The EPA is proposing a statewide NPDES general permit that would authorize stormwater discharges from municipal separate storm sewer systems (MS4s) located in Census-designated 2000, 2010, and 2020 urbanized areas in New Mexico and any other MS4s designated by the Director. If your city or town operates an MS4 within those urbanized area boundaries, it would be covered by this proposed permit.
MS4s Must Meet MEP and Six Controls
The proposed permit requires MS4 operators to prohibit non-stormwater discharges and to reduce pollutants to the maximum extent practicable (MEP) using best management practices (BMPs), control techniques, and design/engineering methods. It specifically requires implementation of BMPs that address the six minimum control measures in 40 CFR 122.34(b) and combines Phase I (large and medium MS4s) and Phase II (small MS4s in urbanized areas) coverage in a single general permit.
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