EPA has defined seven reasons to remove a water from the 303(d) list, as described below. When any of the seven reasons are determined accurate by the state, a request can be made to delist the water/pollutant combination from the 303(d) list.
- The state determines water quality standards are being met.
- There was a flaw in the original 303(d) listing.
- Other pollution controls are expected to meet the water quality standard.
- The impairment is due to a condition other than a pollutant, e.g., a natural environmental condition or a condition not addressed by the total maximum daily load (TMDL) process.
- EPA has approved a TMDL.
- The waterbody is not within the state's jurisdiction.
- Other reasons that are defined as needed.
Delisting a water from a 303(d) list is a formal process that requires approval from EPA.
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