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Use Attainability Analyses

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A use attainability analysis (UAA) is a scientific assessment of the factors affecting the attainment of a designated use. Designated aquatic life or contact uses in the Standards may not be removed or made less stringent unless a UAA demonstrates that attaining the assigned designated use is not feasible due to one of the factors listed in 40 CFR 131.10(g). An “existing use” may not be removed at all unless a use requiring more stringent criteria is added. An existing use is defined as, “a use actually attained in a surface water of the state on or after November 28, 1975, whether or not it is a designated use.” (20.6.4.7 NMAC).

NMED or any other party may conduct a UAA; the Standards explain the requirements at 20.6.4.15 NMAC. Changes to water quality standards based on a UAA must be adopted by the Water Quality Control Commission (WQCC) after a public hearing and then must be approved by the US Environmental Protection Agency (EPA).

Jennifer Fullam
Standards Coordinator
505- 827-2637

MORE AT SWQB...

Use Attainability Analyses
Approved Hydrology Protocol UAAs
Bulleted Item... Hydrology Protocol
Streams subject to 20.6.3.97 NMAC
Free Resources

MORE AT US EPA...

UAA Website
131.10 (g) Factors
UAAs in WQS Handbook

CURRENT LIST OF USE ATTAINABILITY ANALYSES IN NEW MEXICO

Waterbody
/ Watershed
CWA §101(A)(2) Designated Uses Under Review* UAA Proposed Designated Use Changes Status**
Mimbres River / Mimbres Closed Basin Coldwater and High Quality Coldwater Aquatic Life Uses
  • Allie Canyon to the mouth of the Mimbrescoolwater aquatic life use with a segment-specific temperature criterion of 30°C (Segment 803).
  • From Allie Canyon to Cooney canyon (the “Middle Mimbres”) – coldwater aquatic life use (Segment 804).
  • Cooney Canyon to the headwaters of the Mimbres River, including all perennial tributaries – high quality coldwater aquatic life use (Segment 807).
as Public DRAFT UAA
as

EPA Technical Approval Letter
May 8, 2015

as EPA Technical Support Document
as WQCC Technical Approval Pending -- see Triennial Review website
   
Animas River Coldwater and Marginal Coldwater Aquatic Life Uses Coolwater Aquatic Life Uses
FINAL DRAFT UAA
Public DRAFT UAA
Public Notice
EPA Technical Approval Letter
EPA Technical Support Document
Four Unclassified Non-Perennial Waters in Southern New Mexico:
/ Rio Peñasco;
/ Mimbres;
/ Tularosa; and
/Rio Hondo.
Primary Contact, Marginal Warmwater Aquatic Life Uses.

Hydrology protocol (HP) UAA - 4 ephemeral waters subject to 20.6.4.97 NMAC.

Secondary Contact, Limited Aquatic Life Uses.

Final UAA
EPA Technical Approval Letter
EPA Technical Support Document
Five Unclassified Non-Perennial Drainages within the Chino Mine Investigation Area:
/ Mimbres
Primary Contact, Marginal Warmwater Aquatic Life Uses.

Hydrology protocol (HP) UAA - 5 ephemeral streams to be listed under 20.6.4.97 NMAC.

Secondary Contact, Limited Aquatic Life Uses

Public DRAFT UAA
EPA Technical Approval Pending

Santa Fe River:
/ Upper Rio Grande

Secondary Contact, Marginal Warmwater, Warmwater, Marginal Coldwater Aquatic Life Uses.

Santa Fe River from Conchiti Pueblo boundary to City of Santa Fe Wastewater Treatment Plant - Primary Contact, Coolwater Aquatic Life Uses (Segment 113);

Santa Fe River from City of Santa Fe Wastewater Treatment Plant to Guadalupe Street – Primary Contact, Limited Aquatic Life Uses (Segment 136);

Santa Fe River from Guadalupe St. to Nichols Reservoir – Primary Contact, Coolwater Aquatic Life Uses (Segment 137); and

Nichols and McClure Reservoirs – Primary Contact, High Quality Coldwater Aquatic Life Uses (Segment 138).

FINAL UAA
WQCC Approval
January 8, 2013
EPA Approval Letter
June 5, 2013
EPA Technical Support Document
Galisteo Creek and its tributaries:
/ Upper Rio Grande
High Quality Coldwater Aquatic Life Uses. Galisteo Creek and tributaries from Kewa Pueblo boundary to above Lamy, NM – Coolwater Aquatic Life Use (Segment 139).
Final UAA
WQCC-Approved
January 8, 2013
EPA Approval Letter
June 5, 2013
EPA Tecnical Support Document
18 Unclassified Non-Perennial Stream Segments:
/ Various Watersheds
Primary Contact Warmwater, Marginal Warmwater Aquatic Life Uses. Secondary Contact, Limited Aquatic Life Uses.
Final UAA
EPA Technical Approval
Jan. 30, 2013
Dry Cimarron:
/ Dry Cimarron
Coldwater Aquatic Life Coolwater aquatic life use (Segment 702).
Final UAA
WQCC Approved
(April 10, 2012)
EPA Approval
(Nov. 30,  2012)
Sulphur Creek:
/ Jemez River
Primary Contact, High Quality Coldwater Aquatic Life Secondary contact, limited aquatic life use (Segment 124).
Final UAA
WQCC Approval (May 13, 2005)
EPA Approval
(Nov. 16, 2006)
LANL Waters:
/ Upper Rio Grande
Primary Contact, Secondary Contact, Coldwater, Limited Aquatic Life Secondary contact, coldwater aquatic life (Segment 126) and limited aquatic life uses (Segment 128).
Final UAA
WQCC Approval (May 13, 2005)
EPA Approval (August 31, 2007)

* CWA §101(A)(2) designated ‘fishable, swimmable’ uses under evaluation (i.e., primary or secondary contact; aquatic life uses). Other uses evaluated (if applicable) are detailed in the UAA.

**Status Notes:

Public Draft UAA – Draft UAA for public review and comment.

WQCC-Approved - UAA-supported changes to the WQS have been adopted by the WQCC.

EPA-Approved UAA-supported changes to the WQS are approved by EPA.

EPA Technical Approval for HP UAA – UAA-supported changes based on the department’s Hydrology Protocol (HP) are technically approved by EPA for CWA purposes in accordance with 20.6.4.15.C NMAC; waters are subject to 20.6.4.97 until adopted by WQCC in the WQS under Subsection C of 20.6.4.97.

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