groundwater_atlas_statewide_water_chemistry| Field Name | Valid Values | Definition | Definition Source |
|---|
| SYS_LOC_CODE | - | Unique identifier used in EQuIS database | |
| RelateID | - | Unique number: created by County Well Index for wells, Department of Waters (DOW) number from DNR for lakes, Minnesota Spring Inventory from DNR for springs, from EQuIS for atmospheric samples and river/stream samples | |
| LOC_COUNTY_CODE | - | County where sample site is located | |
| PROJECT | - | Project for which the data were collected | |
| LOC_TYPE | - | Type of sample site (well, spring, lake, river/stream, or atmosphere) | |
| LOC_TYPE_2 | - | If a well was sampled, type of well if specified (domestic, public water supply, observation, commercial, irrigation, industrial, piezometer, dewatering, monitoring, other) | |
| UTME | - | UTM Easting of sample site (meters) | |
| UTMN | - | UTM Northing of sample site (meters) | |
| aquifer | - | 4-letter aquifer code from the Minnesota County Well Index (CWI). Data added March 2026. | https://mgsweb2.mngs.umn.edu/cwi_doc/aquifer.asp |
| depth_comp | - | Depth a well is completed to in feet, from the CWI. Data added March 2026. | |
| Date | - | Date sample was collected (MM/DD/YYYY) | |
| Alkalinity_ppm | - | Alkalinity in parts per million, text format | |
| Alkalinity_NUM | - | Alkalinity in parts per million, numeric format | |
| Aluminum_ppb | - | Aluminum concentration in parts per billion, text format | |
| Aluminum_NUM | - | Aluminum concentration in parts per billion, number format | |
| Ammonium_ppm | - | Ammonium concentration in parts per million, text format | |
| Ammonium_NUM | - | Ammonium concentration in parts per million, numeric format | |
| Antimony_ppb | - | Antimony concentration in parts per billion, text format | |
| Anitmony_NUM | - | Antimony concentration in parts per billion, numeric format | |
| Arsenic_ppb | - | Arsenic concentration in parts per billion, text format | |
| Arsenic_NUM | - | Arsenic concentration in parts per billion, numeric format | |
| Barium_ppb | - | Barium concentration in parts per billion, text format | |
| Barium_NUM | - | Barium concentration in parts per billion, numeric format | |
| Beryllium_ppb | - | Beryllium concentration in parts per billion, text format | |
| Beryllium_NUM | - | Beryllium concentration in parts per billion, numeric format | |
| Boron_ppb | - | Boron concentration in parts per billion, text format | |
| Boron_NUM | - | Boron concentration in parts per billion, numeric format | |
| Bromide_ppm | - | Bromide concentration in parts per million, text format. Values denoted with a ‘^’ are less than the reporting limit and above the detection limit. These values should be used with care. | |
| Bromide_NUM | - | Bromide concentration in parts per million, numeric format | |
| Cadmium_ppb | - | Cadmium concentration in parts per billion, text format | |
| Cadmium_NUM | - | Cadmium concentration in parts per billion, numeric format | |
| Calcium_ppm | - | Calcium concentration in parts per million, text format | |
| Calcium_NUM | - | Calcium concentration in parts per million, numeric format | |
| Cesium_ppb | - | Cesium concentration in parts per billion, text format | |
| Cesium_NUM | - | Cesium concentration in parts per billion, numeric format | |
| Chloride_ppm | - | Chloride concentration in parts per million, text format | |
| Chloride_NUM | - | Chloride concentration in parts per million, numeric format | |
| Chronium_ppb | - | Chronium concentration in parts per billion, text format | |
| Chronium_NUM | - | Chronium concentration in parts per billion, numeric format | |
| Cobalt_ppb | - | Cobalt concentration in parts per billion, text format | |
| Cobalt_NUM | - | Cobalt concentration in parts per billion, numeric format | |
| Copper_ppb | - | Copper concentration in parts per billion, text format | |
| Copper_NUM | - | Copper concentration in parts per billion, numeric format | |
| DeltaH_permil | - | Deuterium (permil), text format | |
| DeltaH_NUM | - | Deuterium (permil), numeric format | |
| DO_ppm | - | Dissolved oxygen in parts per million, text format | |
| DO_NUM | - | Dissolved oxygen in parts per million, numeric format | |
| Fluoride_ppm | - | Fluoride concentration in parts per million, text format | |
| Fluoride_NUM | - | Fluoride concentration in parts per million, numeric format | |
| Iron_ppm | - | Iron concentration in parts per million, text format | |
| Iron_NUM | - | Iron concentration in parts per million, numeric format | |
| Lead_ppb | - | Lead concentration in parts per billion, text format | |
| Lead_NUM | - | Lead concentration in parts per billion, numeric format | |
| Lithium_ppb | - | Lithium concentration in parts per billion, text format | |
| Lithium_NUM | - | Lithium concentration in parts per billion, numeric format | |
| Magnesium_ppm | - | Magnesium concentration in parts per million, text format | |
| Magnesium_NUM | - | Magnesium concentration in parts per million, numeric format | |
| Manganese_ppb | - | Manganese concentration in parts per billion, text format | |
| Manganese_NUM | - | Manganese concentration in parts per billion, numeric format | |
| Molybdenum_ppb | - | Molybdenum concentration in parts per billion, text format | |
| Molybdenum_NUM | - | Molybdenum concentration in parts per billion, numeric format | |
| Nickel_ppb | - | Nickel concentration in parts per billion, text format | |
| Nickel_NUM | - | Nickel concentration in parts per billion, numeric format | |
| Nitrate_ppm | - | Nitrate concentration in parts per million, reported as nitrogen, text format | |
| Nitrate_NUM | - | Nitrate concentration in parts per million, reported as nitrogen, numeric format | |
| Nitrite_ppm | - | Nitrite concentration in parts per million, reported as nitrogen, text format | |
| Nitrite_NUM | - | Nitrite concentration in parts per million, reported as nitrogen, numeric format | |
| Nitrate_Nitrite_ppm | - | Calculated field that combines Nitrate_Nitrite_NUM or Nitrate_NUM + Nitrite_NUM into one field, reported in parts per million, numeric format | |
| Nitrate_Nitrite_NUM | - | Nitrate + nitrite concentration in parts per million, reported as nitrogen, numeric format | |
| Nitrate_All_NUM | - | Combined field; nitrate + nitrite OR nitrate concentration in parts per million, reported as nitrogen, numeric format | |
| ORP_mV | - | Oxidation reduction potential in millivolts, text format | |
| ORP_NUM | - | Oxidation reduction potential in millivolts, numeric format | |
| Delta18O_permil | - | Oxygen-18 (permil), text format | |
| Delta18O_NUM | - | Oxygen-18 (permil), numeric format | |
| pH | - | pH, text format | |
| pH_NUM | - | pH, numeric format | |
| Phosphate-phosphorus_ppm | - | Phosphate concentration in parts per million, reported as phosphorus, text format | |
| Phosphate-phosphorus_NUM | - | Phosphate concentration in parts per million, reported as phosphorus, numeric format | |
| Phosphorus_ppm | - | Total phosphorus concentration in parts per million, text format. Values denoted with a ‘^’ are less than the reporting limit and above the detection limit. These values should be used with care. | |
| Phosphorus_NUM | - | Total phosphorus concentration in parts per million, numeric format | |
| Potassium_ppm | - | Potassium concentration in parts per million, text format | |
| Potassium_NUM | - | Potassium concentration in parts per million, numeric format | |
| Rubidium_ppb | - | Rubidium concentration in parts per billion, text format | |
| Rubidium_NUM | - | Rubidium concentration in parts per billion, numeric format | |
| Selenium_ppb | - | Selenium concentration in parts per billion, text format | |
| Selenium_NUM | - | Selenium concentration in parts per billion, numeric format | |
| Silicon_ppm | - | Silicon concentration in parts per million, text format | |
| Silicon_NUM | - | Silicon concentration in parts per million, numeric format | |
| Sodium_ppm | - | Sodium concentration in parts per million, text format | |
| Sodium_NUM | - | Sodium concentration in parts per million, numeric format | |
| SC_uS | - | Specific conductivity in microsiemens per centimeter, text format | |
| SC_NUM | - | Specific conductivity in microsiemens per centimeter, numeric format | |
| Strontium_ppb | - | Strontium concentration in parts per billion, text format | |
| Strontium_NUM | - | Strontium concentration in parts per billion, numeric format | |
| Sulfate_ppm | - | Sulfate concentration in parts per million, text format | |
| Sulfate_NUM | - | Sulfate concentration in parts per million, numeric format | |
| Sulfur_ppm | - | Sulfur concentration in parts per million, text format | |
| Sulfur_NUM | - | Sulfur concentration in parts per million, numeric format | |
| Temp_C | - | Temperature in degrees Celsius, text format | |
| Temp_NUM | - | Temperature in degrees Celsius, numeric format | |
| Thallium_ppb | - | Thallium concentration in parts per billion, text format | |
| Thallium_NUM | - | Thallium concentration in parts per billion, numeric format | |
| Thiosulfate_ppm | - | Thiosulfate concentration in parts per million, text format | |
| Thiosulfate_NUM | - | Thiosulfate concentration in parts per million, numeric format | |
| Tin_ppb | - | Tin concentration in parts per billion, text format | |
| Tin_NUM | - | Tin concentration in parts per billion, numeric format | |
| Titanium_ppb | - | Titanium concentration in parts per billion, text format | |
| Titanium_NUM | - | Titanium concentration in parts per billion, text format | |
| Tritium_TU | - | Tritium in tritium units (TU), text format | |
| Tritium_NUM | - | Tritium in tritium units (TU), numeric format | |
| Trit_Age | enumerated | Residence time based on tritium value | https://files.dnr.state.mn.us/waters/groundwater_section/mapping/gw/gw-05-minnesota-tritium-age.pdf |
| modern | water entered the ground since about 1953 | |
| mixed | water is a mixture of modern and premodern | |
| mostly premodern | tritium not detected and the premodern threshold is below the detection limit | |
| premodern | water entered the ground before 1953 | |
| Tungsten_ppb | - | Tungsten concentration in parts per billion, text format | |
| Tungsten_NUM | - | Tungsten concentration in parts per billion, numeric format | |
| Uranium-238_ppb | - | Uranium-238 concentration in parts per billion, text format | |
| Urainium-238_NUM | - | Uranium-238 concentration in parts per billion, numeric format | |
| Vanadium_ppb | - | Vanadium concentration in parts per billion, text format | |
| Vanadium_NUM | - | Vanadium concentration in parts per billion, numeric format | |
| Zinc_ppb | - | Zinc concentration in parts per billion, text format | |
| Zinc_NUM | - | Zinc concentration in parts per billion, numeric format | |
| Zirconium_ppb | - | Zirconium concentration in parts per billion, text format | |
| Zirconium_NUM | - | Zirconium concentration in parts per billion, numeric format | |
| C14_Age | - | Groundwater residence time in years, estimated using the results of carbon-14 isotope analysis | |
| C14_Date | - | Date carbon-14 sample was collected (MM/DD/YYYY) | |