Name, State, County, Longitude (Deg, Min, Sec), Latitude
(Deg, Min, Sec), Township, Range, Section, Qtr section, Date collected, Map datum, and Sample collector. Location data are of variable quality. Sites with locations given to degrees, minutes, and seconds are considered most accurate, sites with locations given to degrees and minutes are less accurate, and sites with locations given only to decimal degrees are approximate.
Includes T°C, pHfield
(mS), dissolved solids (mg/L), discharge (gallons per minute)
Major dissolved constituents
Includes Ca, Mg, Na, K, Li, SiO2
, Cl, F, SO4
, cation_total, anion_total, charge balance (in %). Concentrations in mg/L, alkalinity is reported as bicarbonate (HCO3
Minor dissolved constituents
Includes B, Br, Fe, H, H2
, I, Mn, NH4
(as N), NO3 field
, NO3 lab
, NO2 field
, NO2 lab
, OH, PO4
(as P), Rb, Sr. Concentrations in mg/L.
, As, Au, Ba, Be, Cd, Co, Cr, Cs, Cu, Hg, Mo, Ni, Pb, S, Sb, Se, U, Zn. Concentrations in mg/L.
Gas composition (free gas bubbles, gas seeps, fumaroles, and steam wells)
+ Ar, O2
, CO, CH4
S, He, H2
, Total free gas. Concentrations in volume percent.
Gas composition (dissolved gas) in micromoles gas per kilogram of water
Includes Ar, O2
, He, H2
. Concentrations in millimoles gas per kilogram of water.
Includes δD, δ18
O, tritium. The isotope compositions of oxygen and hydrogen in a sample are expressed as per mil differences relative to standard mean ocean water (SMOW). Tritium concentrations are reported in tritium units (TU).
Isotopes (dissolved constituents, minerals, and rocks)
Pb_rock. The isotope composition of carbon in the sample is expressed as per mil differences relative to PDB. The isotope composition of oxygen in the samples is reported in per differences relative to SMOW. Strontium and lead values are isotope ratios. The denominator in both the strontium and lead values is a stable isotope that is not produced by decay of any other naturally occurring isotope. 14C values are reported as % modern carbon.
Isotopes (free gas)
C of CO2
O of CO2
N of N2
C of CH4
He. Nitrogen isotope compositions are reported in per mil notation relative to the
N value of air. 3
He values are reported as R/Ra.