
Updated August 2026
The State of New Mexico's Lakes 2026
Of 58 lakes in New Mexico, 17.6% sit in EPA's favourable condition classes for nutrients and algae and 35.3% in its poorer ones. Mescalero Lake Deep is the cleanest; 39 lakes (67.2%) are on an official impaired-waters list.
Data Report
58
Monitored lakes sampled
C
Average readings
17.6%
low nutrient and algae readings
67.2%
On impaired list
New Mexico nutrient and algae readings
Cleanest lakes in New Mexico
Cleanest combined nutrient and algae readings, 2026.
- 1.Mescalero Lake Deep — Otero County50 µg/L P · 1 µg/L chl-a
- 2.Mescalero Lake Shallow — Otero County50 µg/L P · 2 µg/L chl-a
- 3.Silver Lake Deep — Otero County50 µg/L P · 1 µg/L chl-a
- 4.Silver Lake Shallow — Otero County50 µg/L P · 2 µg/L chl-a
Highest measured algae
Highest measured chlorophyll-a (algae) concentration.
- 1.Six Mile Dam Lake — Eddy County110 µg/L chlorophyll-a
- 2.Jal Lake — Lea County62 µg/L chlorophyll-a
- 3.Hopewell Lake — Rio Arriba County53 µg/L chlorophyll-a
- 4.Lake Roberts — Grant County41 µg/L chlorophyll-a
- 5.Caballo Lake — Sierra County37 µg/L chlorophyll-a
- 6.Burns Lake Deep — Rio Arriba County24 µg/L chlorophyll-a
- 7.Brantley Reservoir Deep — Eddy County21 µg/L chlorophyll-a
- 8.Elephant Butte Reservoir — Sierra County21 µg/L chlorophyll-a
Trending lakes
Improving
- 1.Heron Lake Deep Dam — Rio Arriba County
- 2.Grindstone Canyon Reservoir Deep — Lincoln County
- 3.Heron Lake Shallow — Rio Arriba County
- 4.Silver Lake Deep — Otero County
- 5.Alto Lake — Lincoln County
- 6.Silver Lake Shallow — Otero County
- 7.Grindstone Caynon Reservoir Inlet — Lincoln County
- 8.Caballo Lake — Sierra County
Declining
- 1.Hopewell Lake — Rio Arriba County
- 2.E Butte Lake — Sierra County
- 3.Mescalero Lake Deep — Otero County
- 4.Mescalero Lake Shallow — Otero County
- 5.Abiquiu Reservoir Chama R Inlet — Rio Arriba County
- 6.Conchas Reservoir — San Miguel County
- 7.Santa Rosa L Dp Sta Midchannel Buoy Lake — Guadalupe County
- 8.Burns Lake Deep — Rio Arriba County
Impaired waters in New Mexico
39 lakes appear on the EPA/state 303(d) impaired-waters list (39 formally listed, 5 with a cleanup plan/TMDL).
Nutrients (phosphorus, nitrogen) · 20Mercury · 15Temperature · 12PCBs · 4Fish consumption advisory · 3pH / acidity · 3Oxygen depletion (low DO) · 1Metals (other than mercury) · 1
Explore New Mexico lakes
Readings combine total phosphorus, total nitrogen, chlorophyll-a, and turbidity from the EPA Water Quality Portal and state agencies. See the full methodology, the national State of America’s Lakes report, or all New Mexico lakes.
Cite this report: LakeQuality, “The State of New Mexico's Lakes 2026”.