Parameter

Units

Source with high specific DBP yield or extensive distribution system

Source with low specific DBP yield

Organic color

TCU^a

5 - 10

<15

UV absorbance (at 254 nm, UV₂₅₄)

cm⁻¹

0.02 - 0.04

0.02 - 0.07

UV transmittance

Percent

90 - 95

85 - 95

COD^b

mg/L O₂^c

<5

<5

DOC^d―for DBP control

mg/L C^e

<2

<4

DOC^d―for biological stability

mg/L C^e

<1.8

<1.8