The 16 largest wastewater treatment plants in New Mexico
Ranked by average flow · 20 MGD combined · 100% of the state's reported flow
City Of Farmington in Farmington is the largest publicly owned wastewater treatment plant in New Mexico by reported average flow, treating about 6.23 million gallons per day. The 16 plants below treat 20 MGD between them, 100% of the flow reported by all 29 plants in the state, and serve about 232,288 people. Every plant links to its profile with permit, technology and compliance data.
| # | Facility | City | Avg flow (MGD) | Population | NPDES permit | Expires | Technology | Violations (3y) |
|---|---|---|---|---|---|---|---|---|
| 1 | City Of Farmington | Farmington | 6.23 | 56,746 | NM0020583 | Nov 2026 | Clarifiers, Carrousels / oxidation ditches, Biogas silos, Biogas balloons | 47 |
| 2 | Santa Fe WWTP | Santa Fe | 5.52 | 87,505 | NM0022292 | Aug 2026 | Clarifiers, Carrousels / oxidation ditches, Biogas silos, Biogas balloons | 224 |
| 3 | Las Vegas (city Of) | Las Vegas | 1.23 | 13,166 | NM0028827 | Nov 2027 | — | 111 |
| 4 | Sunland Park Wastewater Plant | Sunland Park | 1.2 | 16,234 | NM0029483 | Oct 2025 | Clarifiers | 52 |
| 5 | Anthony Water & Sanitation Dis | Anthony | 1.1 | 8,695 | NM0029629 | Dec 2028 | — | 42 |
| 6 | Taos Wastewater Treatment Plant | Taos | 1.03 | 14,119 | NM0024066 | Oct 2030 | Clarifiers | 56 |
| 7 | Silver City (city Of) - Wastewater Treatment Plant | Silver City | 1.02 | 9,705 | NM0020109 | Aug 2018 | Clarifiers, Carrousels / oxidation ditches | 18 |
| 8 | Espanola, City Of | Espanola | 0.78 | 10,526 | NM0029351 | Feb 2028 | Clarifiers | 13 |
| 9 | Town Of Red River | Taos | 0.5 | 489 | NM0024899 | Jun 2027 | Uncovered lagoons | 23 |
| 10 | City Of Santa Rosa Wastewater | Santa Rosa | 0.29 | 2,850 | NM0024988 | Apr 2027 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 411 |
| 11 | Shiprock WWTF | Shiprock | 0.29 | 9,599 | NN0020621 | Aug 2028 | Clarifiers, Uncovered lagoons, Biogas silos | 8 |
| 12 | Hatch, Village Of | Hatch | 0.25 | 1,539 | NM0020010 | Mar 2031 | — | 0 |
| 13 | Rio Del Oro WW Treatment Fac. | Los Lunas | 0.24 | — | NM0030414 | Jul 2031 | — | 16 |
| 14 | Village Of Chama | Chama | 0.08 | 917 | NM0027731 | Feb 2028 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 171 |
| 15 | Jemez Springs, Village Of | Jemez Springs | 0.04 | 198 | NM0028011 | Jul 2031 | — | 95 |
| 16 | Northern Edge Casino | Fruitland | 0.01 | — | NN0030343 | Nov 2027 | Biogas silos | 5 |
Largest plants in New Mexico: questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026.