This app allows you to check [and save] your metered water bills to all levels of complexity.
It has its own internal help screens, backed up by my website. It will eventually be replaced by a more sophisticated app for general billing.

This is now free because I haven't had the time to update it fully. Here you can Save/Restore/Edit your bills. Also use tools to cost projected increases in use/time/tariffs and generally manipulate billing.

Check your metered water supply/waste bills. Starting with your billing data, this allows you to calculate your correct bill.
It allows for separate Supply and Waste companies. Each can have their own tariff change date [Split Date].
Charges are calculated to 2 decimal places: for standing charges [dates] and volumetric charges [readings].
VAT [Sales Tax] can be added if applicable.

The Standing Charges [1 for Supply and 3 for Waste] can be separately configured (or removed), for headings and charges
Extend this bill to one year (with one click) and use totals

Indicators have been added: units per day and Cost per unit (gross). These help you to compare consumption costs.