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MOWASSCO water bill calculator (Kenya 2026)

Enter your monthly water consumption in cubic metres. The tool estimates the water charge, sewer surcharge, standing charge and VAT using indicative WASREB block-tariff bands published for MOWASSCO. Treat the output as a check on your paper bill rather than an exact quotation.

MOWASSCO bill estimator

Estimator only. Tariff bands are indicative WASREB-published values and may not reflect the current approved schedule. Verify your actual bill against the utility.
Estimated totalKES 2,379
Lifeline 0-6 m³6 m³ × KES 65.00KES 390
7-20 m³9 m³ × KES 95.00KES 855
Water charge subtotalKES 1,245
Sewer charge (75% of water)KES 934
Standing / meter chargeKES 200
TotalKES 2,379
Effective KES per m³KES 158.58

Bands modelled on WASREB-published indicative tariff schedules. Verify current approved schedule on wasreb.go.ke / My Tariffs before disputing a bill.

By paybillke · Updated August 2026 (indicative bands)

Independent. Not affiliated with any company listed.

Water tariffs are approved by WASREB under the Water Act 2016. Block tariff structure standard across Kenyan Water Service Providers. Sewer surcharge as a percentage of water charge is the WASREB-approved billing convention. Domestic piped water is VAT-exempt in Kenya.

Logic and copy © 2026 paybillke. Verified weekly. If you spot an error, use the report tool.

How we verify →

How the estimate is built

MOWASSCO bills residential consumers using a WASREB-approved block tariff: a small lifeline block priced below cost, then progressively higher rates as consumption climbs. Your total bill is the sum of water charge across all blocks you traverse, plus a fixed monthly standing / meter charge, plus a sewer surcharge (typically 75 percent of the water charge) if your property is connected to sewer.

What the estimator does not include

  • Water resource use levy (WSTF cess), charged on some tariff schedules at KES 0.50 per m³.
  • Any pollution or effluent levy the county has approved on top of the base tariff.
  • Outstanding arrears from prior months carried into this bill.
  • Reconnection fees where the account was previously disconnected.

When the estimator is wrong

The tariff bands modelled here are indicative and may be one WASREB review behind the current approved schedule. If your bill differs from the estimate by more than 15 percent, request the current tariff schedule from MOWASSCO customer care (0700 000 400 / 0731 000 400) or check wasreb.go.ke → My Tariffs.

Frequently asked

Are these tariff bands verified against the current WASREB schedule?

No. They are indicative bands based on published block-tariff structures. WASREB reviews tariffs on a public-consultation cycle. Verify against wasreb.go.ke or your latest bill.

Why does my actual bill exceed the estimate?

Common reasons: meter estimation (not an actual read), a hidden leak, arrears carried forward, sewer charge applied where you did not expect, or a new WSTF or pollution levy line item.

Does MOWASSCO charge VAT on water?

Piped domestic water in Kenya is VAT-exempt. Sewerage services and some commercial supplies can carry VAT depending on the tariff class.

How do I check my meter reading myself?

Locate the meter, read the black digits (whole cubic metres), subtract the previous month reading, and compare to the consumption printed on the bill. Report deviations in writing to the utility.

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