Water Quality in the Central Columbia Plateau, Washington and Idaho, 1992-95

Table of contents || Previous section || Next section || Glossary

Summary of compound detections and concentrations

The following tables summarize data collected for NAWQA studies from 1992-1995 by showing results for the Central Columbia Plateau Study Unit compared to the NAWQA national range for each compound detected. The data were collected at a wide variety of places and times. In order to represent the wide concentration ranges observed among Study Units, logarithmic scales are used to emphasize the general magnitude of concentrations (such as 10, 100, or 1000), rather than the precise number. The complete dataset used to construct these tables is available upon request.

Concentrations of herbicides, insecticides, volatile organic compounds, and nutrients detected in ground and surface waters of the Central Columbia Plateau Study Unit. [mg/L, milligrams per liter; µg/L, micrograms per liter; pCi/L, picocuries per liter; %, percent; <, less than; - -, not measured; trade names may vary]


Herbicides, insecticides, volatile organic compounds, and nutrients not detected in ground and surface waters of the Central Columbia Plateau Study Unit.


2,4,5-TP (Silvex, Fenoprop)
Acetochlor (Harness Plus, Surpass)
Acifluorfen (Blazer, Tackle 2S)
Bromacil (Hyvar X, Urox B, Bromax)
Chloramben (Amiben, Amilon-WP, Vegiben)
Clopyralid (Stinger, Lon trel, Reclaim, Transline)
Dicamba (Banvel, Dianat, Scotts Proturf)
Dichlobenil (Barrier, Caso ron, Dyclomec, Norosac)
Dichlorprop (2,4-DP, Seritox 50, Kildip, Lentemul)
Dinoseb (Dinosebe)
Fenuron (Fenulon, Fenidim)
Fluometuron (Flo-Met, Cotoran, Cottonex, Meturon)
MCPB (Can-Trol, Thistrol)
Molinate (Ordram)
Neburon (Neburea, Neburyl, Noruben)
Norflurazon (Evital, Predict, Solicam, Zorial)
Oryzalin (Surflan, Dirimal)
Pebulate (Tillam, PEBC)
Picloram (Grazon, Tordon)
Pronamide (Kerb, Propyzamid)
Triclopyr (Garlon, Grand stand, Redeem, Remedy)


3-Hydroxycarbofuran (Carbofuran metabolite)
Aldicarb sulfone (Standak, aldoxycarb, aldicarb metabolite)
Aldicarb sulfoxide (Aldicarb metabolite)
Aldicarb (Temik)
Chlorothalonil (Bravo, Daconil 2787, Exotherm)
Esfenvalerate (Asana XL, Sumi-alpha)
Methiocarb (Slug-Geta, Grandslam, Mesurol)
Methomyl (Lanox, Lannate, Nudrin)
Oxamyl (Vydate L, Pratt)
Phorate (Thimet, Granutox, Geomet, Rampart)
Propoxur (Baygon, Blattanex, Unden, Proprotox)
Terbufos (Contraven, Counter, Pilarfox)

Volatile organic compounds

1,1,1,2-Tetrachloroethane (1,1,1,2-TeCA)
1,1,2-Trichloroethane (Vinyl trichloride)
1,1-Dichloroethane (Ethylidene dichloride)
1,1-Dichloroethene (Vinylidene chloride)
1,2,3-Trichlorobenzene (1,2,3-TCB)
1,2-Dibromo-3-chloropropane (DBCP, Nemagon)
1,2-Dichlorobenzene (o-Dichlorobenzene, 1,2-DCB)
1,2-Dichloroethane (Ethylene dichloride)
1,3,5-Trimethylbenzene (Mesitylene)
1,3-Dichlorobenzene (m-Dichlorobenzene)
1,4-Dichlorobenzene (p-Dichlorobenzene, 1,4-DCB)
1-Chloro-2-methylbenzene (o-Chlorotoluene)
1-Chloro-4-methylbenzene (p-Chlorotoluene)
Bromobenzene (Phenyl bromide)
Bromochloromethane (Methylene chlorobromide)
Bromodichloromethane (Dichlorobromomethane)
Bromomethane (Methyl bromide)
Chlorobenzene (Monochlorobenzene)
Chloroethene (Vinyl Chloride)
Chloromethane (Methyl chloride)
Dibromochloromethane (Dibromochloromethane)
Dibromomethane (Methylene dibromide)
Dichlorodifluoromethane (CFC 12, Freon 12)
Dichloromethane (Methylene chloride)
Dimethylbenzenes (Xylenes (total))
Ethenylbenzene (Styrene)
Ethylbenzene (Phenylethane)
Isopropylbenzene (Cumene)
Methylbenzene (Toluene)
Tribromomethane (Bromoform)
Trichlorofluoromethane (CFC 11, Freon 11)
cis-1,2-Dichloroethene ((Z)-1,2-Dichloroethene)
cis-1,3-Dichloropropene ((Z)-1,3-Dichloropropene)
n-Butylbenzene (1-Phenylbutane)
n-Propylbenzene (Isocumene)
p-Isopropyltoluene (p-Cymene)
trans-1,2-Dichloroethene ((E)-1,2-Dichlorothene)
trans-1,3-Dichloropropene ((E)-1,3-Dichloropropene)


No non-detects  

Concentrations of semivolatile organic compounds, organochlorine compounds, and trace elements detected in fish and clam tissue and bed sediment of the Central Columbia Plateau Study Unit. [µg/g, micrograms per gram; µg/kg, micrograms per kilogram; %, percent; <, less than; - -, not measured; trade names may vary]


Semivolatile organic compounds, organochlorine compounds, and trace elements not detected in fish and clam tissue and bed sediment of the Central Columbia Plateau Study Unit.

Semivolatile organic compounds

1,2-Dichlorobenzene (o-Dichlorobenzene, 1,2-DCB)
1,3-Dichlorobenzene (m-Dichlorobenzene)
1,4-Dichlorobenzene (p-Dichlorobenzene, 1,4-DCB)
Benzo [c] cinnoline
bis (2-Chloroethoxy)methane

Organochlorine compounds

Chloroneb (chloronebe, Demosan, Soil Fungicide 1823)
Endosulfan I (alpha-Endosulfan, Thiodan, Cyclodan, Beosit, Malix, Thimul, Thifor)
Endrin (Endrine)
Heptachlor (Heptachlore, Velsicol 104)
Isodrin (Isodrine, Compound 711)
Mirex (Dechlorane)
Pentachloroanisole (PCA, pentachlorophenol metabolite)
Toxaphene (Camphechlor, Hercules 3956)
alpha-HCH (alpha-BHC, alpha-lindane, alpha-hexachlorocyclohexane, alpha-benzene hexachloride)
delta-HCH (delta-BHC, delta-hexachlorocyclohexane, delta-benzene hexachloride)
p,p'-Methoxychlor (Marlate, methoxychlore)

Trace elements

No non-detects



a Selected water-quality standards and guidelines [38].

b Rates of detection are based on the number of analyses and detections in the Study Unit, not on national data. Rates of detection for herbicides and insecticides were computed by only counting detections equal to or greater than 0.01 µg/L in order to facilitate equal comparisons among compounds, which had widely varying detection limits. For herbicides and insecticides, a detection rate of "<1%" means that all detections are less than 0.01 µg/L, or the detection rate rounds to less than one percent. For other compound groups, all detections were counted and minimum detection limits for most compounds were similar to the lower end of the national ranges shown. Method detection limits for all compounds in these tables are summarized in [38].

c Detections of these compounds are reliable, but concentrations are determined with greater uncertainty than for the other compounds and are reported as estimated values [43].

d In the Central Columbia Plateau Study Unit, several ground-water samples were analyzed for 1,2-dibromoethane (EDB) at a lower detection limit (0.04 µg/L). The detections shown on page 27 were confirmed, and EDB was detected in one additional well.

e The guideline for methyl tert-butyl ether is between 20 and 40 µg/L; if the tentative cancer classification C is accepted, the lifetime health advisory will be 20 µg/L [38].

f Selected sediment-quality guidelines [38].

U.S. Geological Survey Circular 1144

Table of contents || Previous section || Next section || Glossary

Suggested citation:
Williamson, A.K., Munn, M.D., Ryker, S.J., Wagner, R.J., Ebbert, J.C., and Vanderpool, A.M., 1998, Water Quality in the Central Columbia Plateau, Washington and Idaho, 1992-95: U.S. Geological Survey Circular 1144, on line at <URL:>, updated March 3, 1998.

This page is a subpage of <URL:>
Email questions and comments to
Last modified: Sat Mar 21 13:06:51 1998