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EXPLANATION
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Freshwater-chronic criterion for the protection of aquatic life¹ Drinking water standard or guideline¹ Range of surface-water detections in all 20 NAWQA Study Units Range of ground-water detections in all 20 NAWQA Study Units Detection in the Red River of the North Study Unit |
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| Herbicide (Trade or common name) | Rate of detection² | Concentration, in µg/L |
|---|---|---|
| Acetochlor | 12% 0% |
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| Acifluorfen (Blazer) | 9% 0% |
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| Alachlor (Lasso) | 11% 1% |
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| 2,6-Diethylaniline (metabolite) | 0% <1% |
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| Atrazine (AAtrex) | 79% 16% |
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| Deethylatrazine³ (metabolite) | 22% 15% |
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| Bentazon (Basagran) | 20% 3% |
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| Bromoxynil (Buctril) | 3% 0% |
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| Cyanazine (Bladex) | 56% 1% |
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| 2,4-D (Butyrac) | 12% 0% |
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| DCPA (Dacthal) | <1% 0% |
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| Dicamba (Banvel) | 1% 1% |
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| Dichlorprop (Kildip) | <1% 0% |
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| Diuron (Karmex, Direx) | 1% 0% |
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| EPTC (Eptam) | 28% 1% |
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| Ethalfluralin (Sonalan) | 3% 0% |
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| Fenuron (Beet-Kleen, fenidim) | 1% 0% |
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| MCPA | 6% 0% |
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| Metolachlor (Dual) | 25% 1% |
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| Metribuzin (Lexone, Sencor) | 3% 3% |
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| Molinate (Ordram) | <1% 0% |
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| Pendimethalin (Prowl) | <1% 0% |
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| Picloram (Tordon) | 0% 3% |
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| Prometon (Pramitol) | 14% 0% |
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| Propachlor (Ramrod) | <1% 0% |
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| Propanil (Stampede) | <1% 0% |
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| Simazine (Princep, Weedex) | 10% 3% |
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| Tebuthiuron (Spike) | <1% 0% |
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| Terbacil³ (Sinbar) | <1% 0% |
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| Triallate (Far-Go) | 19% 0% |
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| Trifluralin (Treflan) | 7% 0% |
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| Insecticide (Trade or common name) | Rate of detection² | Concentration, in µg/L |
| Aldicarb³ (Temik) | <1% 0% |
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| Azinphos-methyl³ (Guthion) | <1% 0% |
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| Carbaryl³ (Sevin, Savit) | <1% 0% |
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| Carbofuran³ (Furadan) | 14% 0% |
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| Chlorpyrifos (Lorsban) | 2% 0% |
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| p,p'-DDE (metabolite) | <1% <1% |
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| Diazinon | <1% 0% |
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| Fonofos (Dyfonate) | 1% 0% |
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| gamma-HCH | 2% 0% |
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| Malathion (malathon, Cythion) | 1% <1% |
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| Methyl parathion (Penncap-M) | <1% 0% |
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| Propoxur (Blattanex, Undene) | 1% 0% |
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| Volatile organic compound (Trade or common name) | Rate of detection² | Concentration, in µg/L |
| 1,2,4-Trimethylbenzene | -- 3% |
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| 1,3,5-Trimethylbenzene | -- 3% |
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| Chloroethene (vinyl chloride) | -- 3% |
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| Dimethylbenzenes (total xylenes) | -- 3% |
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| Ethenylbenzene (styrene) | -- 3% |
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| Ethylbenzene (phenylethane) | -- 3% |
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| Isopropylbenzene (cumene) | -- 3% |
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| Methylbenzene (toluene) | -- 3% |
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| Naphthalene | -- 3% |
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| n-Butylbenzene (1-phenylbutane) | -- 3% |
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| n-Propylbenzene (isocumene) | -- 3% |
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| Nutrient | Rate of detection² | Concentration, in mg/L |
| Dissolved ammonia as nitrogen | 92% 80% |
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| Dissolved ammonia plus organic nitrogen as nitrogen | 100% 46% |
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| Dissolved phosphorus as phosphorus | 90% 57% |
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| Dissolved nitrite plus nitrate as nitrogen | 76% 54% |
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| Other | Rate of detection² | Concentration, in pCi/L |
| Radon 222 | -- 99% |
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² 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 Gilliom and others (in press).
³ Detections of these compounds are reliable, but concentrations are determined with greater uncertainty than for the other compounds and are reported as estimated values (Zaugg and others, 1995).