Total Maximum Daily Loads & Alternative Recovery Plans
Waters that persistently do not meet Alaska’s Water Quality Standards (18 AAC 70) are placed in Alaska’s 303(d) Category 5 Impaired Waters List through the Integrated Reporting process. When a water is Category 5 listed, it triggers certain requirements in order for that water to move out of Category 5.
A Total Maximum Daily Load (TMDL) establishes the maximum amount of a pollutant allowed in a waterbody and serves as the starting point or planning tool for restoring water quality. A TMDL identifies pollution sources in a waterbody and calculates the amount or 'load' of that specific pollutant that the water can receive and still maintain Water Quality Standards. TMDLs are a necessary first step toward waterbody recovery and are the primary tool per the Clean Water Act for a waterbody to be moved from the Alaska 303(d) Category 5 Impaired Waters List. TMDLs are approved by EPA and once approved, the water-body moves to Category 4a, impaired with a recovery plan in place. TMDL implementation includes taking actions to improve water quality.
TMDLs are not the only tool DEC utilizes for planning water quality improvements in impaired waters. EPA allows alternative plans that identify actions that when implemented are expected to improve water quality in a set amount of time. These types of alternative plans are also approved by EPA and move an impaired water from Category 5 to Category 4b, impaired with an alternative recovery plan in place.
Waterbody | Region | TMDL (PDF) | Category 4(b) Demonstration | Year | Author | Impairment |
---|---|---|---|---|---|---|
Waterbody | Region | TMDL (PDF) | Category 4(b) Demonstration | Year | Author | Impairment |
Akutan Harbor | Southwest | TMDL (PDF 3.35M) | 1995 | EPA | Dissolved oxygen | |
Akutan Harbor | Southwest | TMDL (PDF 2.22M) | 1995 | EPA | Residues | |
Big Lake | Southcentral | TMDL (PDF 1.8M) | 2012 | DEC | Petroleum hydrocarbons, Oil and Grease | |
Upper Birch Creek | Interior | TMDL (PDF 1.2M) | 1996 | EPA | Turbidity and sediment | |
Cabin Creek | Interior | 4(b) demonstration | 2012 | DEC | Toxic and other deleterious organic and inorganic substances | |
Campbell Creek/Lake | Southcentral | TMDL (PDF 3M) | 2006 | DEC | Fecal coliform bacteria | |
Chester Creek, University Lake, Westchester Lagoon | Southcentral | TMDL (PDF 2.4) | 2005 | DEC | Fecal coliform bacteria | |
Cold Bay | Southwest | 4(b) demonstration | 2020 | DEC | Petroleum Hydrocarbons, Oils, and Grease | |
Cottonwood Creek, Wasilla | Southcentral | TMDL (PDF 4.1M) | 2015 | DEC | Fecal coliform bacteria | |
Crooked Creek Watershed (Crooked, Boulder, Deadwood, and Ketchem Creeks) | Interior | TMDL (PDF 3.55M) | 2019 | EPA | Turbidity | |
Duck Creek | Southeast | TMDL (PDF) | EPA | Debris | ||
Duck Creek | Southeast | TMDL (PDF) | EPA | Fecal coliform bacteria | ||
Duck Creek | Southeast | TMDL (PDF) | EPA | Turbidity | ||
Duck Creek | Southeast | TMDL (PDF) | EPA | Dissolved oxygen and iron | ||
Dutch Harbor | Southwest | TMDL (PDF) | 2010 | DEC | Petroleum hydrocarbons | |
Eagle River | Southcentral | TMDL (PDF) | AWWU | Ammonia, copper, lead, silver, chlorine | ||
Exxon Valdez Oil Spill (EVOS) Beaches | Southcentral | 4(b) demonstration | 2010 | DEC | Petroleum Hydrocarbons, Oils, and Grease | |
Fish Creek, Anchorage | Southcentral | TMDL (PDF) | DEC | Fecal coliform bacteria | ||
Furrow Creek | Southcentral | TMDL (PDF) | 2004 | DEC | Fecal coliform bacteria | |
Garrison Slough | Interior | TMDL (PDF 612K) | 1996 | EPA | Poly-chlorinated biphenyls | |
Goldstream Creek | Interior | TMDL (PDF) | 2015 | DEC | Turbidity | |
Granite Creek | Southeast | TMDL (PDF) | DEC | Turbidity | ||
Hawk Inlet | Southeast | TMDL (PDF) | DEC | Metals in marine sediments | ||
Herring Cove | Southeast | TMDL (PDF) | DEC | Residues | ||
Iliuliuk Harbor | Southwest | TMDL (PDF) | DEC | Petroleum hydrocarbons | ||
Jewel Lake | Southcentral | TMDL (PDF) | EPA | Fecal coliform bacteria | ||
Jordan Creek | Southeast | TMDL (PDF) | DEC | Residues | ||
Jordan Creek | Southeast | TMDL (PDF) | DEC | DO/sediment | ||
King Cove | Southwest | TMDL (PDF) | DEC | Residues | ||
Klag Bay | Southeast | TMDL (PDF) | DEC | Toxic and other deleterious organic and inorganic substances | ||
Lake Lucille | Southcentral | TMDL | DEC | Toxic and other deleterious organic and inorganic substances | ||
Lake Lucille | Southcentral | TMDL (PDF) | DEC | Dissolved oxygen | ||
Lemon Creek | Southeast | TMDL (PDF) | DEC | Sediment and turbidity | ||
Little Campbell Creek | Southcentral | TMDL (PDF) | DEC | Fecal coliform bacteria | ||
Little Rabbit Creek | Southcentral | TMDL (PDF) | DEC | Fecal coliform bacteria | ||
Little Survival Creek | Southcentral | TMDL (PDF) | DEC | Fecal coliform bacteria | ||
Little Sustina River | Southcentral | 4(b) demonstration | 2018 | DEC | Petroleum Hydrocarbons, Oils, and Grease | |
Matanuska River | Southcentral | TMDL (PDF 3.3M) | 2017 | DEC | Residues(debris) | |
Noyes Slough | Interior | TMDL (PDF 1.4M) | 2008 | DEC | Residues | |
Noyes Slough | Interior | TMDL (PDF) | 2011 | DEC | Petroleum hydrocarbons, Oil and Grease | |
Pederson Hill Creek | Southeast | TMDL (PDF) | DEC | Fecal coliform bacteria | ||
Popof Strait | Southwest | 4(b) demonstration | 2019 | DEC | Seafood Residues | |
Pullen Creek | Southeast | TMDL (PDF) | 2010 | DEC | Toxic and other deleterious organic and inorganic substances | |
Red Lake Anton Road Pond, or Red Lake/Anton Road Pond | Southcentral | TMDL (PDF) | DEC | Toxic and other deleterious organic and inorganic substances | ||
Ship Creek | Southcentral | TMDL (PDF) | DEC | Fecal coliform bacteria | ||
Silver Bay | Southeast | 4(b) demonstration | 2020 | DEC | Seafood Residues | |
Silver Bay | Southeast | TMDL (PDF) | DEC | Residue and toxic substances | ||
Skagway Harbor (West & Central) | Southeast | TMDL (PDF) | DEC | Petroleum hydrocarbons | ||
Slate Creek | Interior | TMDL (PDF) | 2014 | DEC | Antimony, arsenic and iron | |
South Unalaska Bay | Southwest | TMDL (PDF) | EPA | Biochemical oxygen demand | ||
South Unalaska Bay | Southwest | TMDL (PDF) | EPA | Settleable solid residues | ||
Swan Lake | Southeast | TMDL (PDF) | DEC | Debris and solid waste | ||
Thorne Bay | Southeast | TMDL (PDF) | DEC | Wood residues | ||
Tributary Creek | Southeast | 4(b) demonstration | 2022 | DEC | Lead | |
Udagak Bay of Beaver Inlet | Southwest | TMDL (PDF) | DEC | Residues | ||
Vanderbilt Creek | Southeast | TMDL (PDF) | DEC | Sediment and turbidity | ||
Ward Cove | Southeast | TMDL (PDF) | DEC | Biochemical oxygen demand | ||
Ward Cove | Southeast | TMDL (PDF) | DEC | Residue and dissolved oxygen |
FAQs about Total Maximum Daily Load (TMDL)
Click question to show answer.
- Just what is a TMDL?
- A TMDL identifies the amount of a pollutant that a waterbody can assimilate and maintain compliance with water quality standards. TMDLs include an appropriate margin of safety and identify the level of management needed to reduce pollutant inputs to a level (or “load”) that allows a waterbody to meet its designated uses.
A TMDL is composed of individual wasteload allocations (WLAs) for point sources and load allocations (LAs) for nonpoint sources and background loads. In addition, the TMDL must include a margin of safety (MOS), either implicitly or explicitly, that accounts for the uncertainty in the relationship between pollutant loads and the quality of the receiving waterbody. - What are water quality standards and designated uses?
- Water Quality Standards are either numeric or narrative standards used to define the goals for a waterbody by designating its uses, setting criteria to protect those uses, and establishing provisions to protect waterbodies from pollutants. Designated uses specify appropriate water uses to be achieved and protected. Appropriate uses are identified by taking into consideration the use and value of the water body for public water supply, for protection of fish, shellfish, and wildlife, and for recreational, agricultural, industrial, and navigational purposes. In designating uses for a water body, States and Tribes examine the suitability of a water body for the uses based on the physical, chemical, and biological characteristics of the water body, its geographical setting and scenic qualities, and economic considerations.
- How are TMDLs implemented?
- The mechanisms used to address water quality problems after the TMDL is developed can include a combination of best management practices (BMPs) for nonpoint sources and/or effluent limits and monitoring required through Alaska Pollutant Discharge Elimination System (APDES) permits. Municipalities and other stakeholders have the opportunity to apply for grants to assist in funding projects to help reduce water pollution. Using a TMDL approach for water bodies does not replace existing water quality control programs or standard treatment technologies. It provides a framework for evaluating all possible water quality control efforts and promotes closer coordination of local, state, and federal efforts to better guarantee that we collectively meet water quality goals.
- How does a TMDL affect my property?
- A TMDL is not designed to act as a permitting tool but rather as a tool for assessing the various sources of pollution associated with a waterbody that cause the waterbody not to meet Alaska Water Quality Standards. Municipal and State zoning and ordinances apply as they would in any other permitting situation. However, permitting requirements and enforcement may be much stricter for properties adjacent to a TMDL waterbody depending on the type, duration, and extent of development to take place. Point source permits must be consistent with approved TMDLs.
- How is the local community involved in restoring water quality?
- The DEC supports the use of a watershed approach to address nonpoint source pollution. A watershed approach is based on the premise that water quality restoration and protection are best addressed through integrated efforts within a defined geographic area. Municipalities, non-governmental organizations, and other interested partners, have the ability to develop waterbody restoration plans and apply for funding to implement such programs. On an annual basis DEC looks for partners to address restoration plans through the Alaska Clean Water Actions (ACWA) program.
- What happens if the TMDL plan doesn’t restore water quality?
- If monitoring indicates that water quality standards are not being achieved after a plan is approved, DEC has the ability to conduct a formal evaluation to determine if:
- The implementation of new and improved management practices are necessary;
- Water quality is improving but more time is needed to comply with water quality standards; or
- Revisions to the plan are necessary to meet water quality standards.
- How can the public comment on the TMDL?
- Alaska has a 30-day public comment period in which anyone is welcome to comment on the TMDL. During this period, news releases are sent out and the copies of the TMDL and public notice are posted on the DEC’s TMDL website. DEC will respond to comments in a “Response to Comments” document prior to submitting the TMDL to EPA for approval.