This is a set of the impaired streams as determined by MPCA's surface water quality assessment process, submitted for the 2020 reporting cycle to the US Environmental Protection Agency (EPA). Streams declared impaired prior to 2020 are also included in this dataset unless they have been delisted or corrected. The waterbodies included in the dataset have been submitted to EPA as part of the impaired waters list. EPA evaluates the list and either approves it as-is or modifies it, which may result in changes to this spatial data. Note that for the purpose of submitting the impaired waters list to EPA, waterbodies partially or wholly within Indian reservation boundaries are published in separate datasets. The MPCA still considers these waters impaired and has an interest in restoring them. The MPCA respectfully requests that the waters partially or wholly within Indian reservations be symbolized differently on map products so that viewers can differentiate them from waters not intersecting Indian reservations. These streams are a subset and enhancement of the 1:24,000 scale National Hydrography Dataset (NHD). In cases where the NHD does not include a stream reach that MPCA has assessed, a feature is added by MPCA. Since the impaired streams are a small subset of the NHD, only that subset is included in the dataset. This dataset includes impaired streams which have not yet had a TMDL plan approved by the US EPA, those that have a US EPA approved TMDL plan as well as those waters that do not need a TMDL plan. To be notified of updates to this shapefile, please send an email to kristofor.parson@state.mn.us