| Data Fields: Field Name | Unit | Description |
| Water Code | | Stream segment code from the USGS National Hydrographic Database. |
| Waterbody Name | | Stream name from NHD database. |
| County Name | | County in which stream segment is located. |
| Town Name | | Town in which stream segment is located. Where a stream segment crosses town line(s), the given town is the one with the greatest segment representation. |
| HUC 12 | | 12-digit USGS hydrologic unit code (watershed). |
| Drainage | | Drainage basin in which sampling site is located. |
| Site | | Sampling site. |
| Record Type | | Sample type: Regular or field duplicate. |
| pH, Closed Cell | standard units | Closed cell pH, determined with electrode. Data have two significant figures. Any values with < 2 decimal places should be read as having zero(s) in the "missing" decimal places. e.g. 7.1 = 7.10. |
| pH, Air-Equilibrated | standard units | Air-equilibrated pH, determined with electrode. Any values with < 2 decimal places should be read as having zero(s) in the "missing" decimal places. e.g. 7.1 = 7.10. |
| ANC | micro-equivalents per liter (ueq/L) | Acid-neutralizing capacity, determined by Gran titration. Any values with < 1 decimal place should be read as having zero(s) in the "missing" decimal places. e.g. 7 = 7.0. |
| Dissolved Inorganic Carbon | milligrams per liter (mg/L) | Dissolved organic carbon, determined by infrared carbon analyzer. Any values with < 1 decimal place should be read as having zero(s) in the "missing" decimal places. e.g. 7 = 7.0. |
| Conductivity | microSiemens per cm (uS) | Specific conductance, determined with a Wheatstone bridge. |
| True Color | Platinum cobalt units | True color. |
| Apparent Color | Platinum cobalt units | Apparent color, determined by colorimetric comparison. |
| Dissolved Organic Carbon | milligrams per liter (mg/L) | Dissolved organic carbon, determined by infrared carbon analyzer, persulfate oxidation. Any values with < 1 decimal place should be read as having zero(s) in the "missing" decimal places. e.g. 7 = 7.0. |
| Calcium | micro-equivalents per liter (ueq/L) | Sodium, determined by ion chromatography, or inductively coupled atomic emission spectroscopy (ICP), or flame atomic absorption - method depends on project. |
| Magnesium | micro-equivalents per liter (ueq/L) | Sodium, determined by ion chromatography, or inductively coupled atomic emission spectroscopy (ICP), or flame atomic absorption - method depends on project. |
| Sodium | micro-equivalents per liter (ueq/L) | Sodium, determined by ion chromatography, or inductively coupled atomic emission spectroscopy (ICP), or flame atomic absorption - method depends on project. |
| Potassium | micro-equivalents per liter (ueq/L) | Sodium, determined by ion chromatography, or inductively coupled atomic emission spectroscopy (ICP), or flame atomic absorption - method depends on project. |
| Chloride | micro-equivalents per liter (ueq/L) | Chloride, determined by ion chromatography. |
| Nitrate | micro-equivalents per liter (ueq/L) | Nitrate, determined by ion chromatography Detection Limit: 0.1 ueq/L. Reporting Limit: 1.0 ueq/L. Any values with < 1 decimal place should be read as having zero(s) in the "missing" decimal places. e.g. 7 = 7.0. |
| Nitrate Flag | | < DL = below detection limit. < RL = below reporting limit. |
| Ammonium | milligrams per liter (mg/L) | Ammonium. Any values with < 2 decimal places should be read as having zero(s) in the "missing" decimal places. e.g. 7.1 = 7.10. |
| Ammonium Flag | | < DL = below detection limit. < RL = below reporting limit. |
| Sulfate | micro-equivalents per Liter (ueq/L) | Sulfate, determined by ion chromatography. |
| Silica | milligrams per liter (mg/L) | Silica. Any values with < 2 decimal places should be read as having zero(s) in the "missing" decimal places. e.g. 7.1 = 7.10. |
| Silica Flag | | < DL = below detection limit. < RL = below reporting limit. |
| Aluminum, Total | micrograms per liter (ug/L) | Total dissolved aluminum, determined by inductively coupled atomic emission spectroscopy (ICP), or graphite furnace atomic absorption spectroscopy - method depends on project. Any values with < 1 decimal place should be read as having zero(s) in the "missing" decimal places. e.g. 7 = 7.0. |
| Aluminum, Organic | micrograms per liter (ug/L) | Organic aluminum, determined by inductively coupled atomic emission spectroscopy (ICP), or graphite furnace atomic absorption spectroscopy - method depends on project. Any values with < 1 decimal place should be read as having zero(s) in the "missing" decimal places. e.g. 7 = 7.0. |
| Aluminum, Unfiltered | micrograms per liter (ug/L) | Unfiltered aluminum, determined by inductively coupled atomic emission spectroscopy (ICP), or graphite furnace atomic absorption spectroscopy - method depends on project. Any values with < 1 decimal place should be read as having zero(s) in the "missing" decimal places. e.g. 7 = 7.0. |
| Total Nitrogen | milligrams per liter (mg/L) | Total nitrogen. Any values with < 2 decimal places should be read as having zero(s) in the "missing" decimal places. e.g. 7.1 = 7.10. |
| Total Phosphorus | micrograms per liter (ug/L) | Total phosphorus. |
| Water Temperature | degrees Celcius | Water temperature |
| Discharge | Cubic meters per second | Stream discharge (flow) |
| Project | | Project: INSTUD = Intensive studies of stream fish populations in Maine (Haines et al. 1990). ASAP = Atlantic salmon acidity project. (GMC) DEP Tribs = Stream chemistry surveys by MDEP. CEDAR = Calcium enhancement of Downeast area rivers (GMC). Penobscot = Penobscot River monitoring (GMC). ASC Watersheds = Synoptic survey of stream chemistry in Atlantic salmon watersheds (Johnson and Kahl 2005). |
| Easting, Northing | | UTM coordinates: NAD83, Zone 19. |
