Most disagreements about a water or power bill are not really about the amount. They are about the fact that nobody can show how the amount was reached.
A metered charge is arithmetic, and it only ever has four parts:
- The previous reading: where the meter stood at the last bill.
- The current reading: where it stands now.
- The units used: the difference between the two.
- The rate: what one unit costs.
Units used, multiplied by the rate. That is the entire calculation. A bill that shows you only the final figure has removed the three numbers you would need to check it.
What a checkable bill looks like
Water · Unit 4B Previous 12, current 18, 6 units × KES 150 = KES 900
Anyone can verify that in ten seconds, including the person who issued it. Compare it with "Water: 900". Same charge, but now the only way to query it is to ask someone to go and look something up, which is exactly the friction that turns a small question into a standing grievance.
How to check yours
- Find the previous reading. It should be on the bill. If it isn't, ask, and ask for it to be shown on future bills rather than told to you once.
- Go and read the meter yourself. Take a photograph with the digits legible. Do this on the same day the bill was raised if you can; a reading taken two weeks later will not match, and that mismatch is not evidence of anything.
- Do the multiplication. If the units and rate are shown and the total doesn't follow, that is a straightforward error worth raising immediately and politely.
- Watch the gap between readings. If last month's "current" is not this month's "previous", a reading has been missed or estimated, and the consumption has been pushed into the wrong month.
Estimated readings are not wrong, but they are borrowed
Sometimes a meter cannot be read, because nobody was home or the box was locked, and an estimate is used. That is normal. What matters is that the next real reading corrects it, so an over-estimate comes back to you rather than quietly staying in the total. A bill that says a reading was estimated is being honest with you. A bill that estimates silently is storing up an argument for whenever the meter is finally read.
If you're the one issuing the bills
The lesson runs the other way too. Showing the derivation costs nothing and removes most of the queries before they are asked. In , a metered charge carries its reading, its rate and its sum onto the bill and onto the receipt, so a tenant asking "why is it this much?" can see the answer without anyone having to look anything up. Fewer calls, and no month where the honest answer is "I'd have to check".
Whatever system you use, the test is the same: could the person paying this bill check it without phoning you? If not, the bill is incomplete.