Standard | Variable | Ideal | Acceptable | Tolerable |
Croc Interim RQO | NO3 + NO2 (mg/l) | 0.5 | 2 | 4 |
TWQG (1996) | NO3 + NO2 (mg/l) | 6 | n/a | n/a |
Inkomati RQO (2016) | NO3 + NO2 (mg/l) | unavailable | unavailable | unavailable |