This dataset contains line work representing streams and rivers listed as "impaired" in Iowa's 2016 Section 305(b) Water Quality Assessment and the 303(d) Impaired Waters Report. Together, these two reports are known as Iowa's 2016 Integrated Report. Waterbodies in Iowa each have specific designations based on what they are commonly used for-recreation, such as swimming or fishing; drinking water; or maintaining a healthy population of fish and other aquatic life. Every two years, Iowa must report on its progress in meeting water quality goals to the U.S. Environmental Protection Agency (EPA). The state prepares one report called the 305(b) Water Quality Assessment or 305(b) list. This 305(b) list categorizes waterbodies to reflect: those that meet all the designated uses (category 1), those in which data availability is insufficient to determine whether any or all designated uses are being met (categories 2 and 3), and those waters in which the water quality prevents it from fully meeting its designated use, and is thus considered "impaired". New impairments (or category 5 listings) are placed on the "303(d) Impaired Waters Report", commonly referred to as the "impaired waters list." This is named after section 303(d) of the Federal Clean Water Act and means that the stream or lake needs a water quality improvement plan written (also known by a technical name, "Total Maximum Daily Load," or "TMDL"). The water quality improvement plan outlines water quality problems, identifies sources of the problem(s), identifies needed reductions in pollutants and offers possible solutions. Water quality improvement plans are approved by the EPA and then the waters are moved from the 303(d) list back to the 305(b) list as category 4 listings (waters considered impaired, but a water quality improvement plan has been written).
This dataset has the following 14 columns:
Column Name | API Column Name | Data Type | Sample Values |
---|---|---|---|
Segment | the_geom | multiline | view top 100 |
ADB Code | adb_code | text | 01-TRK-121 01-YEL-447 01-YEL-439 01-YEL-437 01-WPS-354 view top 100 |
ADB Name | adb_name | text | Iowa River Des Moines River Cedar River Missouri River Yellow River view top 100 |
Cycle Listed | cyclelistd | number | 2008 2014 2004 2016 2006 view top 100 |
Waterbody Type | wbtype | text | River view top 100 |
Designated Use | desig_use | text | A1 B(WW-1) B(WW-2) B(CW1) A2 view top 100 |
Support | support | text | PS NS view top 100 |
Category | category | text | 5p 5a 5b-t 4a 5b view top 100 |
List | list | text | 303(d) 305(b) view top 100 |
Impairment | impairment | text | Bacteria: Indicator Bacteria, E. coli Biological: low fish & invert IBIs, cause unknown Biological: low aquatic macroinvertebrate IBI Fish Kill: Caused By Animal Waste Biological: low fish IBI view top 100 |
Listing Rated | listingrat | text | Geometric mean criterion exceeded Low Biotic Index Pollutant-caused fish kill Significantly > 10% of samples fail to meet criterion Fish consumption advisory in effect: no more than 1 meal/week view top 100 |
Data Source | datasource | text | Watershed project monitoring Biological monitoring: Iowa DNR WQMA Special project/study Fish kill investigation: Iowa DNR Ambient monitoring: Iowa DNR-rivers view top 100 |
TMDL Priority | tmdlpriori | text | Tier III Tier IV N/A view top 100 |
Implementation Status | impstatus | text | Continuing New Delisted view top 100 |