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

Comprehensive Assessment and Listing Methodology

San Juan River at sunset The Monitoring, Assessment, and Standards Section of  SWQB has documented listing methodologies (previously called Assessment Protocols) for determining use attainment in order to develop the State of New Mexico Clean Water Act (CWA) §303(d)/§305(b) Integrated Report and List.

The Comprehensive Assessment and Listing Methodology (CALM) explains how the SWQB evaluates existing and readily available surface water quality data and other information to determine whether or not surface water quality standards are being attained.  Written listing methodologies are necessary to consistently determine whether or not surface waters are meeting their designated and uses.  Protocols are updated as new and improved assessment tools and approaches become available.

The SWQB invited the public to comment on the draft revised listing methodology from June 26 – July 25, 2019, while concurrently soliciting surface water quality data for all surface waters of the state that can be compared to water quality standards published in 20.6.4 NMAC.

Do you collect water quality data? Click here for data submittal information.
Final Comprehensive Assessment and Listing Methodology (CALM)
Main CALM 
 Appendix A ALU Data Quality
 Appendix B Temperature
Appendix C Nutrients – Streams 
 Appendix D  Nutrients-Lakes 

Public notice

 Appendix E  Dissolved Oxygen
 Appendix F  pH  
 Appendix G  Sedimentation
 Appendix H  Turbidity
 Appendix I   IR Category 4b


CALM Supporting Web Pages
Bioassessment Nutrient Assessment
Sedimentation Assessment Fish Consumption Advisories
Previous Versions
2017 2015 2013 2011
2009 2008 2006 2004
2000 1998