Grading | Condition (Character) | Standard | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|

pH | BOD (mg/L) | COD (mg/L) | TOC (mg/L) | SS (mg/L) | DO (mg/L) | TP (mg/L) | Coliform group (count/100mL) | ||||

Total coliform | Fecal coliform | ||||||||||

Very good | Ia | 6.5〜8.5 | Less than 1 | Less than 2 | Less than 2 | Less than 25 | 7.5 or more | Less than 0.02 | Less than 50 | Less than 10 | |

Good | Ib | 6.5〜8.5 | Less than 2 | Less than 4 | Less than 3 | Less than 25 | 5.0 or more | Less than 0.04 | Less than 500 | Less than 100 | |

Slightly good | II | 6.5〜8.5 | Less than 3 | Less than 5 | Less than 4 | Less than 25 | 5.0 or more | Less than 0.1 | Less than 1,000 | Less than 200 | |

Usually | III | 6.5〜8.5 | Less than 5 | Less than 7 | Less than 5 | Less than 25 | 5.0 or more | Less than 0.2 | Less than 5,000 | Less than 1,000 | |

Poor | IV | 6.0〜8.5 | Less than 8 | Less than 9 | Less than 6 | Less than 100 | 2.0 or more | Less than 0.3 | |||

Bad | V | 6.0〜8.5 | Less than 10 | Less than 11 | Less than 8 | There should not be litter | 2.0 or more | Less than 0.5 | |||

Very bad | VI | Greater than 10 | Greater than 11 | Greater than 8 | Under 2.0 | Greater than 0.5 |