New Mexico
Environment Department

Contact Information:
(505) 827-2855 MAIN // 1-800-219-6157 (toll free)
Environmental Emergencies:
505-827-9329 (24 hrs)

Surface Water Quality

Total Maximum Daily Loads



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 TMDL Alternative (IR Category 4b Demonstration), for each assessment  unit – pollutant combination.

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, TMDL Coordinator, with any questions about TMDL activities.

Key TMDL documents and links
List of New Mexico TMDLs
(Excel & pdf)
TMDL fact sheet
Prioritization Framework and 10-year Vision Comprehensive Assessment and Listing Methodology (CALM) 303(d)/305(b) Integrated Report
Probable Sources SOP 4.1
Consent Decree information
Forest Guardians v. C. Browner (1996)
Settlement Agreement  (1997)
EPA-NMED MOU  (2001) Consent Decree dismissal (2009)

Settlement Agreement dismissal (2019)