Elapsed

Time

Water

Quality Items

0 hr

1 hr

2 hrs ( ): by sound

Drinking

Water Quality

Standards

Standard

decision

① TOC (mg/L)

2.4

3.3

3.8 (1.8)

≤3 (mg/L)

○

② Ca²⁺ (μg/L)

400

450

440 (290)

≤300 (mg/L)

○

③ Mg²⁺ (μg/L)

30

70

90 (30)

≤300 (mg/L)

○

④ ${\text{NO}}_3^{-}$ & ${\text{NO}}_2^{-}$ (mg/L)

0.3

0.3

0.3 (0.3)

≤10 (mg/L)

○

⑤ ${\text{NO}}_2^{-}$ (mg/L)

0.05

0.06

0.06 (>0.05)

≤0.04 (mg/L)

△

⑥ No. of General Bacteria (CFU/mL)

13

9

8 (11)

≤100 (CFU/mL)

○

⑦ No. of Colitis Germ Legions

Detected

ND

ND (ND)

ND*

○

⑧ pH

6.0

6.4

7.0 (6.6)

5.8 - 8.6

○