Separately metered water and sewer cost calculator

Variable water and sewer cost is calculated as V_water × r_water + V_sewer × r_sewer. Use the stated system boundary and matching input units.

Units

\text{Cost} = V_{\text{water}} \times r_{\text{water}} + V_{\text{sewer}} \times r_{\text{sewer}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

\text{Cost} = 950 \times 4.2 + 600 \times 5.8 = 7{,}470

Symbol	Meaning	Unit
$\text{Cost}$	variable water and sewer cost	$
$V_{\text{water}}$	billed water volume	kgal
$r_{\text{water}}$	water price	$/kgal
$V_{\text{sewer}}$	separately billed sewer volume	kgal
$r_{\text{sewer}}$	sewer price	$/kgal

Symbol	Meaning	Unit
$\text{Cost}$	variable water and sewer cost	$
$V_{\text{water}}$	billed water volume	m³
$r_{\text{water}}$	water price	$/m³
$V_{\text{sewer}}$	separately billed sewer volume	m³
$r_{\text{sewer}}$	sewer price	$/m³

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.