Under Section 303(d)(1) of the federal Clean Water Act, each state is required to develop a list of waters within that state which are not supporting their designated uses established in the state Water Quality Standards and establish a total maximum daily load (TMDL) or prepare an Advanced Restoration Plan (ARP).
A TMDL is defined as the “calculation of the maximum amount of a pollutant allowed to enter a waterbody so that the waterbody will meet and continue to meet water quality standards for that particular pollutant. A TMDL determines a pollutant reduction target and allocates load reductions necessary to the source(s) of the pollutant.”
Contact Heidi Henderson at heidi.henderson@env.nm.gov with TMDL questions.
—Recent Actions-–
WQCC Approved Upper Pecos River Watershed TMDL (10-13-2026)
WQCC approval order
WQCC Approved Upper Rio Grande Watershed TMDL (10-13-2026)
WQCC approval order
EPA Approved Jemez River Watershed TMDL (10-13-2026)
WQCC approval order – EPA approval letter
EPA Approved San Juan and Animas River Watershed TMDL (10-08-2026)
WQCC approval order – EPA approval letter
Key Documents
- List of New Mexico TMDLs
- List of New Mexico TMDL – Waste Load Allocations
- Prioritization Framework and 10-year TMDL Vision- 2026 update