The term “303(d) list” or “list” is short for a state’s list of impaired and threatened waters (e.g. stream/river segments, lakes). States are required to submit their list for EPA approval every two years. For each water on the list, the state identifies the pollutant causing the impairment, when known.
What is Section 303 D of the Clean Water Act?
Section 303(d) of the Clean Water Act authorizes EPA to assist states, territories and authorized tribes in listing impaired waters and developing Total Maximum Daily Loads (TMDLs) for these waterbodies.
How do I calculate TMDL?
TMDL = ΣWLA + ΣLA + MOS Where WLA is the sum of wasteload allocations (point sources), LA is the sum of load allocations (nonpoint sources and background) and MOS is the margin of safety.
What is a point source discharge?
The U.S. Environmental Protection Agency (EPA) defines point source pollution as “any single identifiable source of pollution from which pollutants are discharged, such as a pipe, ditch, ship or factory smokestack.” Some factories discharge their effluents directly into a waterbody.
How does the Clean Water Act deal with impaired water bodies?
When a water body is impaired, a plan is required to restore the waters to a healthy condition. If nonpoint reductions fail, then permits must be tightened to reach the goal of clean water.
What is the biggest cause of sediment pollution?
Construction activity is the most common source of sediment pollution. According to the Environmental Protection Agency, sediment pollution causes approximately $16 billion in environmental damage annually.
What is an approved TMDL?
A Total Maximum Daily Load (TMDL) is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards.
What is the value of water?
Water also has a tremendous environmental value. Water allows plants, mangroves and peatlands to filter water, purify air, store carbon, reduce soil erosion, nurture biodiversity and offer protection from storms and droughts. People and companies use and rely on these natural services, “for free”.
What is the 303d list in Washington State?
Starting with the 2004 Water Quality Assessment, Washington’s 303 (d) list of polluted waters were placed under category 5 in the approved assessment. Total Maximum Daily Loads (TMDLs) or other approved water quality improvement projects are required for the water bodies in this category.
What is 303d of the Clean Water Act?
The federal Clean Water Act requires that all states restore their water bodies to be “fishable and swimmable.” Section 303 (d) of the Clean Water Act establishes a process to identify and clean up polluted water. What is the Water Quality Atlas? We also have a mapping tool called the Water Quality Atlas.
What is the 303(d) listed impaired waters program?
The 303 (d) Listed Impaired Waters program system provides impaired water data and impaired water features reflecting river segments, lakes, and estuaries designated under Section 303 (d) of the Clean Water Act. Each State will establish Total Maximum Daily Loads (TMDLs) for these waters.
Where is SR 303 in Kitsap County?
SR 304 →. State Route 303 (SR 303) is a 9.27-mile (14.92 km) state highway in Kitsap County, located in the U.S. state of Washington. The highway connects SR 304 in Bremerton to an interchange with SR 3 in Silverdale.
