Total Maximum Daily Loads (TMDLs)
Total maximum daily loads or TMDLs are an assessment of the amount of pollutant a waterbody can receive and not violate water quality standards. A TMDL determines how much pollutant load a lake or stream can assimilate. TMDLs take into account pollution from all sources, including discharges from sewage treatment facilities and industry; runoff from farms, forests, and urban areas; and natural sources.
TMDLs provide a way to integrate the management of both point and nonpoint sources of pollution through the establishment of wasteload allocations (WLA) for point source discharges and load allocations (LA) for nonpoint sources of pollution.
Approved TMDLs
| Waterbody | Reach Description | TMDL Parameters | Documents |
Brockliss Slough, including East and West Branches | From its divergence from the Carson River, West Fork to its confluence with the Carson River | Turbidity | |
Bryant Creek | From the Nevada-California state line to its confluence with the East Fork of the Carson River | Arsenic, Iron, Nickel, Total Suspended Solids (TSS), Turbidity | |
Carson River | From Weeks Bridge at Highway 95 to Lahontan Reservoir | Phosphorus (Total) | |
Carson River | From Genoa Lane to Cradlebaugh Bridge | Phosphorus (Total), Total Suspended Solids (TSS), Turbidity | |
Carson River | Cradlebaugh Bridge to Mexican Ditch Gage | Phosphorus (Total), Total Suspended Solids (TSS), Turbidity | |
Carson River | From Mexican Ditch Gage to New Empire | Phosphorus (Total), Total Suspended Solids (TSS), Turbidity | |
Carson River | From New Empire to Dayton Bridge | Phosphorus (Total), Total Suspended Solids (TSS), Turbidity | |
Carson River | Dayton Bridge to Weeks Bridge at Highway 95 | Phosphorus (Total), Total Suspended Solids (TSS), Turbidity | |
Carson River, East and West Forks and Carson River | Carson River, East Fork from Muller Lane to the West Fork, Carson River, West Fork from Muller Lane to the East Fork, and Carson River from the confluence of the East and West Forks to Genoa Lane | Phosphorus (Total), Total Suspended Solids (TSS), Turbidity | |
Carson River, East Fork | From Nevada-California state line to Riverview Mobile Home Park | Total Suspended Solids (TSS), Turbidity | |
Carson River, East Fork | From Riverview Mobile Home Park to Highway 88 | Phosphorus (Total), Total Suspended Solids (TSS), Turbidity | |
Carson River, East Fork | From Highway 88 to Muller Lane | Phosphorus (Total), Total Suspended Solids (TSS), Turbidity | |
Carson River, West Fork | From the Nevada-California state line to Muller Lane | Phosphorus (Total), Total Suspended Solids (TSS), Turbidity | |
Dixie Creek | From its origin to its confluence with the Humboldt River, South Fork | Temperature | |
Hanks Creek | From its origin to its confluence with the Marys River | Temperature | |
Humboldt River | From Osino to Palisade | Phosphorus (Total), Total Suspended Solids (TSS) | |
Humboldt River | From Palisade to Battle Mountain | Phosphorus (Total), Total Suspended Solids (TSS) | |
Humboldt River | From Battle Mountain to Comus | Phosphorus (Total), Total Dissolved Solids, Total Suspended Solids (TSS) | |
Humboldt River | From Comus to Imlay | Phosphorus (Total), Total Dissolved Solids, Total Suspended Solids (TSS) | |
Lake Tahoe | The entire Lake (Nevada Portion only) | Clarity | |
Las Vegas Wash | Las Vegas Wash from the Historic Lateral to its confluence with Lake Mead | Ammonia (Total), Chlorophyll-a, Phosphorus (Total) | |
Mill Creek | From the West line of section 11, T. 45 N., R. 53 E., M.D.B. & M. to the Owyhee River | Cadmium, Copper, Iron, Dissolved Oxygen, pH, Phosphorus (Total), Temperature, Total Dissolved Solids, Total Suspended Solids (TSS), Turbidity | |
Owyhee River | From Wildhorse Reservoir to its confluence with Mill Creek | Iron, Phosphorus (Total), Temperature, Total Suspended Solids (TSS), Turbidity | |
Owyhee River | From its confluence with Mill Creek the border of the Duck Valley Indian Reservation | Copper, Iron, Phosphorus (Total), Temperature, Total Suspended Solids (TSS), Turbidity | |
Rio Tinto Gulch | From its origin to Mill Creek | Cadmium, Copper, Iron, Dissolved Oxygen, pH, Phosphorus (Total), Temperature, Total Dissolved Solids, Total Suspended Solids (TSS), Turbidity | |
Truckee River | From East McCarran Blvd to Lockwood | Nitrogen (Total), Phosphorus (Total), Total Dissolved Solids | |
Truckee River | From Lockwood to Derby Dam | Nitrogen (Total), Phosphorus (Total), Total Dissolved Solids | |
Truckee River | From Derby Dam to Wadsworth | Nitrogen (Total), Phosphorus (Total), Total Dissolved Solids | |
Virgin River | From the Nevada-Arizona state line to Mesquite | Boron | |
Virgin River | From Mesquite to river mouth at Lake Mead | Boron | |
Walker Lake | The entire lake | Total Dissolved Solids | |
Walker River | From the confluence of Walker River, West and East Forks to the boundary of the Walker River Indian Reservation | Total Suspended Solids (TSS) | |
Walker River, East Fork | From the Walker River, East Fork at the Nevada-California state line to Bridge B-1475 | Total Suspended Solids (TSS) | |
Walker River, East Fork | From Bridge B-1475 to its confluence with the Walker River, West Fork | Total Suspended Solids (TSS) |