Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Historic surface water </SPAN><SPAN STYLE="font-style:italic;">E. coli </SPAN><SPAN>monitoring site locations and data summaries showing estimated compliance rates with the Michigan water quality standard. Data are compiled by the State of Michigan Department of Environment, Great Lakes and Energy (EGLE) from EGLE-Water Resources Division and publicly available sources (Water Quality Exchange [WQX]). At a minimum, this dataset is updated annually in December from EGLE's own data and WQX. Please note that it is not updated immediately as new results are available. Only monitoring events with a daily geometric mean of three or more samples are included in this dataset.</SPAN></P><P><SPAN>Fields include the site ID, site description, number of sampling events, whether there was a 30-day water quality standard exceedance, sample collector (agency), and the number of water quality standard exceedances. Total Body Contact is represented as TBC, while Partial Body Contact is represented as PBC. Note that if a monitoring event exceeds both the TBC and the PBC, it will only be counted as a PBC exceedance numerically. </SPAN></P><P><SPAN>Updated: 04/14/2021</SPAN></P></DIV></DIV></DIV>
Copyright Text: Molly Rippke, Water Resources Division, Michigan Department of Environment, Great Lakes and Energy (EGLE). WQX derived data is attributed to the data collector as indicated in the "Collector" field. Please direct question or corrections to: Rippkem@michigan.gov. Original data may also be requested via email (please request by watershed, county or site ID).
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN>Groundwater discharges are regulated by EGLE and treat sewage by separating solids from liquids through settling, skimming or sieving, and then generally apply the liquid to the ground. The liquid waste then percolates through the ground (similar to a septic system), allowing time and filtration from the soils to further treat the effluent. Groundwater discharges are not expected to be a source of E. coli to surface water if they are functioning properly. More detailed information, such as discharge monitoring reports and compliance history can be found on the MiWaters Site Explorer. Fields include permit number, permit category, type of facility, and facility name.</SPAN></P><P /><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>To learn more, see the Statewide E. coli TMDL, Section 7.4.D (Nonpoint Sources, Groundwater Discharges). Available at http://www.michigan.gov/EcoliTMDL.</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Copyright Text: Molly Rippke, Water Resources Division, Michigan Department of Environment, Great Lakes, and Energy (EGLE). MiWaters, https://miwaters.deq.state.mi.us/miwaters
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This layer is intended to provide estimates of nonpoint sources on the subwatershed level. These include estimates of livestock agriculture (such as livestock numbers and manure land-application area), the number of on-site septic systems, lost wetland, natural riparian buffers, and the amount of land that is covered by impervious surfaces. Each nonpoint source indicator (or stressor) is given a category based on how the subwatershed compares with all other subwatersheds in the entire state (e.g. a subwatershed that is marked as "high" for impervious surfaces would have a high amount of impervious surface relative to the state median value). </SPAN></P><P><SPAN>Land cover (NOAA, 2011), population and housing unit data (US Census Bureau, 2010 and 2012), agricultural census data (USDA, 2014), lost wetland (Fizzell, 2015), and septic system information are summarized for each 12-digit HUC level subwatershed in Michigan. The number of hogs and cattle, and the percent of agricultural land that has manure land-applied or tiled, are estimates derived from county-based agricultural census data. These county-level data were then distributed geographically across all agricultural land cover in that county (assuming even distribution or impact of the livestock across agricultural land), then intersected with subwatersheds to obtain a population estimate. The number of septic systems are estimates and should also be verified locally. Septic systems were estimated by determining the number of housing units in census blocks that were served by sanitary sewers, and assuming that the remainder relied on residential septic systems. The number of housing units served by sanitary sewers was estimated from permit applications on file in EGLE's MiWaters database and files (collection system maps, shapefiles where available from the permittee, and/or estimates of population served). Natural riparian buffer coverage is a percent of stream miles with a 30 meter natural vegetation buffer, and was created by buffering the stream hydrography layer and intersecting the buffer with forested and wetland 2011-era land cover.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Molly Rippke, Water Resources Division, Michigan Department of Environment, Great Lakes, and Energy (EGLE).
Fizzell, C. (2015). Status and Trends of Michigan’s Wetlands: Analysis of Wetland Quantity and Quality Pre-European Settlement to 2005. , Michigan Department of Environmental Quality.
EGLE MiWaters Database. https://miwaters.deq.state.mi.us/miwaters/external/home
NOAA (2011). NOAA Coastal Change Analysis Program (C-CAP) Zone 51 (lower) 2011-Era Land Cover. Charleston, SC. National Oceanic and Atmospheric Administration. Accessed 2014.
U.S. Census Bureau (2010). "Michigan TIGER/Line Shapefiles. 2010 Census Block Polygons for the State of Michigan. ."
U.S. Census Bureau (2012). Census of Population and Housing, 2010 [United States]: Redistricting Data (Public Law 94-171) Summary File. USDA (2014). 2012 Census of Agriculture- Michigan State and County Data. , United States Department of Agriculture - National Agricultural Statistics Service.
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>A high density of human population is generally correlated with higher </SPAN></SPAN><SPAN STYLE="font-style:italic;"><SPAN>E. coli</SPAN></SPAN><SPAN>in surface water, for reasons which may include; pet waste, illicit connections, failing septic systems, and attracting nuisance wildlife such as raccoons. This layer shows areas with more than 912 housing units per square mile (or, above the average housing unit density for the census blocks in the state). This layer will be replaced in full after each decennial Census. </SPAN></P></DIV></DIV></DIV>
Copyright Text: Molly Rippke, Water Resources Division, Michigan Department of Environment, Great Lakes, and Energy (EGLE).
Data Sources: U.S. Census Bureau (2012). Census of Population and Housing, 2010 [United States]: Redistricting Data (Public Law 94-171) Summary File. C. B. U.S. Department of Commerce.
U.S. Census Bureau (2010), Michigan TIGER/Line Shapefiles. 2010 Census Block Polygons for the State of Michigan.
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This layer shows the legal description of the agricultural fields where land-application is approved, and does not give the exact location of the fields due to accuracy issues with coordinates submitted by the septage hauler applicants. These are potential fields for land-application of septage and may not recieve waste each year. Domestic septage is defined as the solids that settle out in an on-site septic system tank, which must be pumped and hauled away. Septage can be land applied at a site permitted by EGLE in accordance with state law to ensure pathogens do not contaminate surface waters, and so the nutrients are utilized by crops as a fertilizer. Septage is regulated by Michigan’s 2004 Public Act 381, which amended Part 117, Septage Waste Servicers, of the NREPA (1994 PA 451, as amended). For more information, visit EGLE's Septage Hauler Directory. Updates will occur about once per year (Layer Updated: 5/2/2020)</SPAN></P></DIV></DIV></DIV>
Copyright Text: Molly Rippke, Water Resources Division, Michigan Department of Environment, Great Lakes, and Energy (EGLE).
Data Source: EGLE's Septage Hauler Directory and Database (internal)
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This layer shows the extent of Pasture/Hay and Cultivated Land Gridcodes (6 and 7) combined from </SPAN><SPAN><SPAN>nlcd_2011_landcover_2011_edition_2014_03_31.img</SPAN></SPAN></P><P><SPAN>For ease of display, the 2011 Landcover Raster had been converted to a shapefile, intersected with 12-digit Hydrologic Unit Codes (HUCs), and dissolved by 12-digit HUC. The field "area_sqmi" is the area (in square miles) of agricultural land in each 12-digit HUC. 12-digit HUCs were obtained from the USDA Geospatial Data Gateway version of the Watershed Boundary Dataset (WBD) layers. The USGS WBD data can be downloaded from the following link: http://nhd.usgs.gov/data.html. </SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Copyright Text: NOAA, 2011. NOAA Coastal Change Analysis Program (C-CAP) Zone 51 (lower) 2011-Era Land Cover. Charleston, SC. National Oceanic and Atmospheric Administration. Accessed 2014. nlcd_2011_landcover_2011_edition_2014_03_31.img
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN>This layer contains the percentage of generalized land cover by 12-digit hyrdologic unit codes (HUCs). The 2011 NOAA C-CAP land cover raster was converted to a shapefile, generalized to minimize the number of categories, intersected with 12-digit Hydrologic Unit Codes (HUCs), and dissolved by generalized category and 12-digit HUC. Percent calculations were then made based on the total area of each 12-digit HUC.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>Fields: subwatershed name, subwatershed HUC, and percent cover in generalized categories, as follows: "Agricultural" includes pasture and cultivated area; "Forest" and "Wetland" includes all types within those broader categories (e.g. evergreen, decidious, etc); "Other" includes water and barren land; and "Developed" includes all gradations (high density, low density, etc). </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>The field "area_sqmi" is the area (in square miles) of the entire 12-digit HUC. </SPAN></P></DIV></DIV></DIV>
Copyright Text: Molly Rippke, Water Resources Division, Michigan Department of Environment, Great Lakes, and Energy (EGLE).
Data Source: NOAA, 2011. NOAA Coastal Change Analysis Program (C-CAP) Zone 51 (lower) 2011-Era Land Cover. Charleston, SC. National Oceanic and Atmospheric Administration. Accessed 2014. nlcd_2011_landcover_2011_edition_2014_03_31.img
12-digit HUCs were obtained from the USDA Geospatial Data Gateway version of the Watershed Boundary Dataset (WBD) layers. The USGS WBD data can be downloaded from the following link: http://nhd.usgs.gov/data.html.
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Michigan's watersheds for USEPA approved E. coli Total Maximum Daily Loads (TMDLs). The watersheds indicate approxiate areas used for determination of the waste load (point sources) and load allocation (nonpoint sources) of each TMDL. Data are compiled by the State of Michigan Department of Environment, Great Lakes, and Energy (EGLE), Water Resources Division. At a minimum, this dataset is updated every two years after the approval of Michigan's Integrated Report (303d List). Features include a hyperlink to the applicable TMDL document, and the year of USEPA approval. Version: November, 2020.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Copyright Text: Molly Rippke, Water Resources Division, Michigan Department of Environment, Great Lakes, and Energy (EGLE). Please direct questions to: Rippkem@michigan.gov