Nairobi water bill calculator

Updated 12 November 2026

This free calculator estimates a Nairobi Water bill from the official WASREB tariff for Nairobi City Water and Sewerage Company. Type the cubic metres on your bill, pick your customer type, and say whether you have a sewer connection. The rates come from Gazette Notice No. 2710 of 27 February 2026, as corrected by Gazette Notice No. 4164 of 9 March 2026, and cover the financial years 2025/2026 to 2028/2029.

How to use the Nairobi water bill calculator

Find the consumption in cubic metres (m3) on your latest Nairobi Water bill or by dialling *260# and choosing the bill query option. Enter that figure, choose the category that matches your account, and keep sewerage switched on if the plot is connected to the sewer. The result splits the water charge from the sewerage charge. For a typical house, leave the type on domestic. Use the multi-dwelling option for a block or gated community billed as one account. Commercial, government and public school rates are in the gazette as well.

If you have a sewer connection but no metered water, choose that option instead of entering units. The gazette sets a flat KSh 350 a month for a single domestic dwelling in that situation.

How the official tariff is worked out

Domestic water is billed in rising blocks on the full metered volume. The first 6 m3 cost KSh 68 each, the next 14 m3 (up to 20) cost KSh 85, then KSh 91 up to 50 m3, KSh 101 up to 100 m3, KSh 109 up to 300 m3, and KSh 117 above that. Multi-dwelling units and gated communities pay a flat KSh 85 per cubic metre for water.

Sewerage is not billed on the same volume as water. After the March 2026 corrigenda, sewerage is charged on 75% of the water volume, at the sewerage rates, not at the water rates. For a domestic customer those sewerage rates are KSh 58, 65, 73, 81, 85 and 93 per cubic metre in the same block sizes, applied to that 75% volume. A household that used 10 m3 of water therefore pays water on 10 m3 and sewerage on 7.5 m3. That comes to KSh 748 for water and KSh 445.50 for sewerage, or KSh 1,193.50 in total, before any miscellaneous charge.

The gazette also says that a customer whose meter is not working is billed on the average of the last three months, and that a disconnected water account can still be billed sewerage on the same three-month average. Those situations need your own bill history, so they are not guessed here.

Other official charges you may see

The same notices list deposits and other fees that are not part of a normal monthly usage bill. A domestic water deposit is KSh 2,500. A new water connection is KSh 2,500. Reconnection at the meter point is KSh 1,000; reconnection at the mains is KSh 5,000 plus double the deposit. A domestic sewer connection is KSh 2,500. Meter testing on request is KSh 500. The gazette allows inflation indexation from July 2027, so the figures in this tool should be checked again after that date.

Pay an existing bill through M-Pesa Paybill 444400, using your water account number, or through *260#. For step-by-step payment, meter and reconnection help, see our Nairobi Water help page and the Nairobi Water bills, meters and tariffs FAQ. For wider household costs, the Kenya Power token and bill calculator uses the official EPRA electricity tariff.

Frequently asked questions

How much is a Nairobi Water bill for 10 cubic metres?

A domestic customer with a sewer connection pays about KSh 1,193.50 on the current gazetted rates: KSh 748 for 10 m3 of water and KSh 445.50 for sewerage on 7.5 m3. Type 10 into the tool to see the split.

Is sewerage 75% of my water bill or 75% of the volume?

It is 75% of the volume, billed at the sewerage tariff. Gazette Notice No. 4164 of 9 March 2026 corrected an earlier wording that had pointed to the water tariff. This calculator follows the corrected notice.

Does the bill include VAT?

The approved tariff tables in the two gazette notices do not add VAT on top of these water and sewerage rates. If your bill shows another line, copy that figure from the bill itself; do not assume a rate that is not in the gazette.

When will these rates change?

The structure runs through the 2028/2029 financial year, with inflation indexation allowed from July 2027. Nairobi Water has told customers it bills strictly by this WASREB tariff.

Sources

• Kenya Gazette Notice No. 2710 of 27 February 2026, approved tariff structure for Nairobi City Water and Sewerage Company for 2025/2026 to 2028/2029, published by the Water Services Regulatory Board under the Water Act, 2016. Official PDF: wasreb.go.ke/wp-content/uploads/2026/04/Kenya-Gazette-Vol-CXXVIIINo-34-NCWSC-March-26.pdf
• Kenya Gazette Notice No. 4164 of 9 March 2026, corrigenda replacing item 1.2.1 (a) so that sewerage is billed at the sewerage tariff on 75% of the water volume. Official PDF: wasreb.go.ke/wp-content/uploads/2026/04/Kenya-Gazette-Vol-CXXVIIINo-NCWSC.pdf

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