U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
The following limitations establish the quantity or quality of pollutants or pollutant properties, controlled by this section, which may be discharged by a point source subject to the provisions of this subpart after application of the best available technology economically achievable:
(a) The following limitations constitute the maximum permissible discharge for urea manufacturing operations in which urea is produced as a solution product:
| Effluent characteristics | Effluent limitations (mg/l) | |
|---|---|---|
| Maximum for any 1 day | Average of daily values for 30 consecutive days shall not exceed— | |
| Ammonia (as N) | 0.53 | 0.27 |
| Organic nitrogen (as N) | 0.45 | 0.24 |
(b) The following limitations constitute the maximum permissible discharge for urea manufacturing operations in which urea is prilled or granulated:
| Effluent characteristics | Effluent limitations (mg/l) | |
|---|---|---|
| Maximum for any 1 day | Average of daily values for 30 consecutive days shall not exceed— | |
| Ammonia (as N) | 0.53 | 0.27 |
| Organic nitrogen (as N) | .86 | .46 |
