Site | Nitrate Level (mg/L) | |
Spring | Fall | |
Mississippi River, Clinton, IA | 0.55 | 1.20 |
Mississippi River, Memphis, TN | 1.60 | 2.90 |
Rio Grande River, El Paso, TX | 0.38 | 0.59 |
Ohio River, Benwood, WV | 0.87 | 1.30 |
Willamette River, Portland, OR | 0.28 | 0.98 |
Missouri River, Garrison Dam, ND | 0.40 | 0.14 |
Hudson River, Poughkeepsie, NY | 0.49 | 0.64 |
Platte River, Sharpes Station, MO | 1.90 | 1.30 |