Scientific Investigations Report 2007–5179
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5179
Table 5. Median concentration of nutrient species within regional National Water-Quality Assessment Program study units in the arid to semiarid Western United States, 1993–2004.
[Concentration for nitrogen species expressed as milligrams nitrogen per liter; orthophosphorus and total phosphorus concentrations expressed as milligrams phosphorus per liter. Abbreviations: CAZB, Central Arizona Basins; GRSL, Great Salt Lake Basins; NVBR, Nevada Basin and Range; RIOG, Rio Grande Valley; SACR, Sacramento River Basin; SANJ, San Joaquin-Tulare Basins; SOCA, Southern California Basins. Symbols: <, less than; –, not applicable]
| Nutrient species | Land use | Study units | ||||||
|---|---|---|---|---|---|---|---|---|
| CAZB | GRSL | NVBR | RIOG | SACR | SANJ | SOCA | ||
| Ammonia nitrogen | Agricultural | <0.04 | – | 0.050 | <0.04 | <0.04 | <0.04 | – |
| Urban | – | <0.04 | <0.04 | 0.07 | <0.04 | – | 0.36 | |
| Kjeldahl nitrogen | Agricultural | <0.2 | – | 0.28 | 0.20 | <0.2 | <0.2 | – |
| Urban | – | <0.2 | <0.2 | <0.20 | <0.2 | – | 0.62 | |
| Nitrite nitrogen | Agricultural | <0.01 | – | <0.01 | <0.01 | <0.01 | <0.01 | – |
| Urban | – | <0.01 | <0.01 | <0.01 | <0.01 | – | <0.01 | |
| Nitrate nitrogen | Agricultural | 19.6 | – | <0.1 | 2.0 | 0.72 | 8.3 | – |
| Urban | – | 6.8 | 2.7 | <0.1 | 2.4 | – | <0.1 | |
| Orthophosphorus | Agricultural | <0.02 | – | 0.180 | 0.06 | 0.074 | 0.037 | – |
| Urban | – | 0.028 | 0.046 | 0.03 | 0.079 | – | 0.060 | |
| Total phosphorus | Agricultural | 0.015 | – | 0.150 | 0.06 | 0.064 | 0.040 | – |
| Urban | – | 0.032 | 0.021 | 0.03 | 0.113 | – | 0.053 | |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2007/5179
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