## USGS domains of WQX-Outbound data elements

Domains are not enforced on data elements by the WQX-Outbound schema. However, the expected domains are listed here to assist others in conforming to a consistent nomenclature. A "domain-values" web service can be queried to determine the USGS-supplied values of the domains used for retrievals.

**CharacteristicName**: is confined by the **USEPA Substance Registry System** (SRS),
with a small number of exceptions also implemented by the USEPA WQX system.

USGS identifies measurements using parameter codes. The association of parameter codes to SRS names is evolving as parameters and SRS names are added and modified. This list will be updated periodically. A relatively small number of USGS results (<3% of non-taxonomic measurements) are not provided through the water-quality web services. Measurements are not included for one of these reasons: (1) No Substance Registry System (SRS) name has been assigned, (2) measurement describes counts of algae or benthic invertebrate taxonomic groups, or (3) measurement describes surrogate recovery for a compound added at the laboratory prior to analysis. These data may be obtained from NWIS Web.

The following names are employed but are not in the SRS.

Aluminum, Organic + Inorganic Monomeric (reactive aluminum) Aluminum, Organic Monomeric (reactive aluminum) Hydrophilic fraction of organic carbon Hydrophobic fraction of organic carbon Transphilic fraction of organic carbon

## NWIS Parameter Code to SRS Crosswalk

The association of USGS parameter codes with WQX-Outbound data elements is available in html or Excel formats. The following column names are used.

- parm_cd - USGS parameter code
- description - USGS parameter description
- epa_equivalence - Comparison of USGS usage with USEPA of this parameter code
- characteristicname - WQX-Outbound characteristic name
- measureunitcode - WQX-Outbound measurement units
- resultsamplefraction - WQX-Outbound sample fraction
- resulttemperaturebasis - WQX-Outbound temperature basis
- resultstatisticalbasis - WQX-Outbound statistical basis
- resulttimebasis - WQX-Outbound time basis
- resultweightbasis - WQX-Outbound weight basis
- resultparticlesizebasis - WQX-Outbound particle-size basis

**ResultSampleFractionText: **

Fraction | Comment |
---|---|

Bed Sediment | - Added by USGS |

Bedload | - Added by USGS |

Comb Available | |

Dissolved | |

Free Available | |

Non-filterable | |

Non-settleable | |

Recoverable | |

Settleable | |

Suspended | |

Total | |

Total Residual |

**MeasureUnitCode: **

Units | Comment |
---|---|

#/m3 | Number per cubic meter |

#/ml | Number per milliliter |

% | Percent |

% by wt | Percent by weight |

% saturatn | Percent of saturation - added by USGS |

100xA/cm/c | 100 times the absorbance per centimeter per milligram per liter of hydrophobic acid - added by USGS |

AU | Light, detection angle 180 degrees to incident light, attenuation units - added by USGS |

AU/cm | Light absorbance units per centimeter - added by USGS |

BU | Light, detection angle 0 degrees to incident light, backscatter units - added by USGS |

Bcol/day | Billions of colonies per day - added by USGS |

Deg | Direction or angle, degrees |

FAU | Light detection angle 180 degrees to incident light, attenuation units - added by USGS |

FBU | Light detection angle 0 degrees to incident light, backscatter units - added by USGS |

FNMU | Light multiple beam, detectors at multiple angles including 90 degrees, - added by USGS |

FNRU | Light multiple beam, detectors at multiple angless including 90 degrees, ratiometric correction - added by USGS |

FNU | formazin nephelometric units - added by USGS |

IVFU | in vivo fluorescence units - added by USGS |

JTU | Turbidity, Jackson Turbidity Units |

Kac-ft | thousand acre feet - added by USGS |

L/mgDOC*m | Liter per (milligram of dissolved organic carbon * meter) - added by USGS |

MPN | Most Probable Number |

MPN/100 ml | Most Probable Number per 100 milliliters |

MPN/100L | most probable number per 100 liters - added by USGS |

MPN/gram | most probable number per gram - added by USGS |

Mft3 | million cubic feet - added by USGS |

Mgal | million gallons - added by USGS |

NTMU | Light multiple beam, detectors at multiple angles including 90 degrees, - added by USGS |

NTRU | Light detectors at multiple angles including 90 +/-30 degrees, ratiometric correction, nephelometric - added by USGS |

NTU | Turbidity, Nephelometric Turbidity Units |

None | None |

PCU | Platinum Cobalt Units (color) |

PSS | Practical Salinity Scale |

PrsAbs | presence or absence - added by USGS |

PrsAbs/50L | presence or absence in 50 liters - added by USGS |

PrsAbs0.1L | presence or absence per 100 milliliters - added by USGS |

RFU | Relative fluorescence units - added by USGS |

T.U. | Tritium Unit |

TON | Threshold Odor Number |

ac-ft | Acre-feet |

bq/g | becquerels per gram - added by USGS |

cal/cm2/d | calories per square centimeter per day - added by USGS |

cells/mm2 | number of cells per square millimeter - added by USGS |

cfs | Cubic feet per second |

cfs-days | cubic feet per second-days - added by USGS |

cfu/100ml | Colony Forming Units per 100 Milliliters |

cm3/g @STP | Cubic centimeters per gram at standard temperature and pressure - added by USGS |

cm3/g STP | cubic centimeters per gram at standard temperature and pressure - added by USGS |

code | code - added by USGS |

col/gram | colonies per gram - added by USGS |

col/mL | colonies per milliliter - added by USGS |

counts/sec | Counts per second - added by USGS |

cysts/100L | cysts per 100 liters - added by USGS |

cysts/10L | cysts per 10 liters - added by USGS |

days | Days |

deg C | Degrees Celsius (Centigrade) |

deg F | Degrees Fahrenheit |

dpm/g | disintegrations per minute per gram - added by USGS |

dpm/l | Disintegrations per minute per liter - added by USGS |

fg/kg | femtograms per kilogram - added by USGS |

ft | feet |

ft abv MSL | feet above mean sea level - added by USGS |

ft/sec | Feet per second |

g H2O/g | grams of water per gram of dry solids - added by USGS |

g/day | Grams per day |

g/kg | grams per kilogram |

g/m2 | grams per square meter |

g/m2/day | grams per square meter per day |

g/m3 | grams per cubic meter |

g/mL @ 20C | grams per milliliter at 20 degrees Celsius - added by USGS |

gal/batch | gallons per batch - added by USGS |

gal/min | Gallons per minute |

in | inches |

in/H2O | Pressure, inches of water |

in/Hg | Pressure, inches of mercury |

inches/day | inches per day - added by USGS |

kPa | kilopascals - added by USGS |

l | Liters |

lb/d as N | pounds per day as nitrogen - added by USGS |

lb/day | Pounds per day |

m | meters |

m/sec | Meters per second |

m2/g | square meters per gram - added by USGS |

mL/L/hr | milliliters per liter per hour - added by USGS |

mV | Millivolts |

meq/100g | milliequivalents per 100 grams - added by USGS |

meq/L | Milli-equivalents per Liter |

mg 02/m2/d | milligrams oxygen per square meter per day - added by USGS |

mg 02/m3/d | milligrams oxygen per cubic meter per day - added by USGS |

mg/g | milligrams per gram |

mg/kg | milligrams per kilogram |

mg/kg NH4 | milligrams per kilogram as NH4 - added by USGS |

mg/kg PO4 | milligrams per kilogram as phosphate - added by USGS |

mg/kg as N | milligrams per kilogram as nitrogen - added by USGS |

mg/kg as P | milligrams per kilogram as phosphorus - added by USGS |

mg/l | milligrams per liter |

mg/l CaCO3 | Milligrams per liter calcium carbonate |

mg/l NH4 | milligrams per liter as NH4 - added by USGS |

mg/l NO3 | milligrams per liter as nitrate - added by USGS |

mg/l PO4 | milligrams per liter as phosphate - added by USGS |

mg/l SiO2 | milligrams per liter as silicon dioxide - added by USGS |

mg/l as H | milligrams per liter as hydrogen ion - added by USGS |

mg/l as N | milligrams per liter as nitrogen - added by USGS |

mg/l as Na | milligrams per liter as sodium - added by USGS |

mg/l as P | milligrams per liter as phosphorus - added by USGS |

mg/l as S | milligrams per liter as sulfur - added by USGS |

mg/m2 | milligrams per square meter |

mg/m2 NH4 | milligrams per square meter as NH4 - added by USGS |

mg/m2 NO3 | milligrams per square meter as nitrate - added by USGS |

mg/m2 as N | milligrams per square meter as nitrogen - added by USGS |

mg/m2 as P | milligrams per square meter as phosphorus - added by USGS |

mg/m2 as S | milligrams per square meter as sulfur - added by USGS |

mg/mL @25C | Milligrams per liter at 25-degrees Celsius - added by USGS |

mgC3H6O2/L | milligrams per liter as propionic acid - added by USGS |

mgal/mnth | Millions of gallons per month |

mgd | Millions of gallons per day |

millibars | millibars - added by USGS |

minutes | Minutes |

ml/l | Milliliters per liter |

mm | millimeters |

mm/Hg | Pressure, millimeters of mercury |

mosm/kg | milliosmoles per kilogram - added by USGS |

ng/POCIS | nanograms per polar organic chemical integrative sampler (POCIS) - added by USGS |

ng/SPMD | nanograms per semi-permeable membrane device - added by USGS |

ng/g | nanograms per gram |

ng/l | nanograms per liter |

ng/m2/hr | nanograms per square meter per hour - added by USGS |

ng/m2/wk | nanograms per square meter per week - added by USGS |

ng/m3 | nanograms per cubic meter |

nmol/L | nanomoles per liter - added by USGS |

nu | number or gage |

ocyst/100L | oocysts per 100 liters - added by USGS |

oocyst/10L | oocysts per 10 liters - added by USGS |

pCi/L | pico-Curies per Liter |

pCi/g | pico-Curies per gram |

pCi/ml | pico-Curies per milliliter |

pct modern | percent modern - added by USGS |

per mil | per mil - added by USGS |

pg/g | picograms per gram |

pg/kg | picograms per kilogram |

pg/l | picograms per liter |

pg/m3 | picograms per cubic meter |

pg/mL | picograms per milliliter - added by USGS |

ppth | parts per thousand |

std units | standard units - added by USGS |

ton/d as N | tons per day as nitrogen - added by USGS |

ton/d/ft | tons per day per foot of width - added by USGS |

tons/ac ft | Tons per acre feet |

tons/day | Tons per day |

uS/cm | Micro-Siemens per Centimeter |

uS/cm @25C | Microsiemens per centimeter at 25 degrees Celsius - added by USGS |

ueq/L | Micro-equivalents per Liter |

ug/L U3O8 | micrograms per liter as uranium(V,VI) oxide (U3O8) - added by USGS |

ug/L as As | micrograms per liter as arsenic - added by USGS |

ug/L as Cl | micrograms per liter as chloride - added by USGS |

ug/L as N | micrograms per liter as nitrogen - added by USGS |

ug/L as P | micrograms per liter as phosphorus - added by USGS |

ug/g | micrograms per gram |

ug/g as Cl | micrograms per gram as Chloride - added by USGS |

ug/g as N | micrograms per gram as Nitrogen - added by USGS |

ug/kg | micrograms per kilogram |

ug/l | micrograms per liter |

ug/m2 | micrograms per square meter |

ug/mg | micrograms per milligram - added by USGS |

ugAtrazn/L | micrograms per liter as Atrazine - added by USGS |

ugAtrzn/kg | ug of Atrazine per kilogram - added by USGS |

umol/l | micromoles per liter - added by USGS |

umol/m2/s | micro moles per square meter per second |

units/cm | Units per centimeter, for UV absorbance |

watts/m2 | watts per square meter - added by USGS |

**ResultWeightBasisText: **

Weight Basis | Comment |
---|---|

Ash Weight | Added by USGS |

Ash-Free Dry | |

Dry | |

Wet |

**ResultTemperatureBasisText: **

Temperature Basis | Comment |
---|---|

105 deg C | |

110 deg C | |

180 deg C | |

20 deg C | |

25 deg C | |

35 deg C | |

37 deg C | |

42 deg C | |

43 deg C | |

44.5 deg C | |

60 deg C | |

Heated |

**ResultStatisticalBasisText: **

Statistical Basis | Comment |
---|---|

1-Sigma CSU | Combined standard uncertainty, 1 standard deviation - Added by USGS |

2-Sigma CSU | Combined standard uncertainty, 2 * standard deviation - Added by USGS |

Counting Error | Added by USGS |

Maximum | |

Mean | |

Standard Deviation |

**DetectionQuantitationLimitType: **

Quantitation Limit Type | Comment |
---|---|

Elevated detection limit | Added by USGS |

Historical lower reporting limit | Added by USGS |

Interim reporting level | Added by USGS |

Laboratory reporting level | Added by USGS |

Long term method detection level | |

Lower quantitation limit | |

Minimum reporting level | Added by USGS |

Method detection limit | |

Sample-specific min detect concentration | Added by USGS |

Sample-specific critical level | Added by USGS |

Upper reporting limit |

**ResultDetectionConditionText: **

Detection Condition | Comment |
---|---|

Not Detected | |

Systematic Contamination | Added by USGS |

Detected Not Quantified | |

Present Above Quantification Limit |

**ResultStatusIdentifier: **

Result Status Type | Comment |
---|---|

Preliminary | |

Historical | Added by USGS |

Accepted |