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