Icon Water reads your meter every three months. The litres recorded (in kL) on your meter between two meter reading dates is the total billable water consumption for that quarter.
The total water consumption may be split between two different charges depending on how much water you use on average per day for the period. The tier 1 rate is charged for any usage up to 0.548kL per day, and tier 2 is charged for all remaining usage.
Let’s calculate this using the water consumption charges from our webpage invoice example:

We first need to know if there will be any water charged at the tier 2 rate. We do this by working out the average daily usage in the billing period. If the average daily usage is higher than the tier 1 allocation of 0.548kL per day, we know that some water will be charged at tier 2. If the average daily usage is less than 0.548kL, all water is charged at tier 1.
- The billing period is 90 days
- Total water used is 172kL
- 172kL/ 90 days = 1.91kL average daily usage.
This average daily usage is higher than the tier 1 allocation of 0.548kL per day, so we know there will be some water charged at the tier 2 rate.
To work out how much water is charged at tier 1, we need to multiply the 0.548kL allocation by the number of days on the bill.
- 0.548kL x 90 days = 49.32kL
This is then charged at the tier 1 rate. We will use the pricing in this invoice example, current pricing can be found in the schedule of charges
- 49.32kL x $2.48 = $122.31
We then need to calculate how much water will be charged at the tier 2 rate. We first need to subtract the water already charged at tier 1 from the total consumption
- 172kL total consumption – 49.32kL at tier 1 = 122.68kL
This remaining water is then charged at the tier 2 rate
- 122.68kL x $4.99 = $612.17
Add the tier 1 and tier 2 costs together for total consumption charges.
- $122.31 + $612.17 = $734.48 total consumption charges