Therefore the guideline outlines principles in tariff setting, application process to be followed by all providers and the assessment of tariff proposals.
The regulation of the tariff setting process aims at
1. Financial sustainability of utilities - Providing sufficient revenues to cover the
justified costs obligations for sustainable WSS service provision
2. Distributive justice and affordability of WSS service- Ensuring a minimum quantity
of water is affordable particularly to low income consumers
3. Consumer protection, economic efficiency and fair pricing- Protecting the
consumers from paying for inefficiencies of service providers and unfair charges.
4. Ensuring that the process is transparent, simple to understand and predictable
http://www.nwasco.org.zm/jdownloads/Water Tariffs/Tariff Gui...

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Note added at 1 hr (2020-03-16 17:12:25 GMT)
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The tariff for sewerage services is calculated as a percentage of the water consumption and should at least reflect the O&M cost of handling and treating sewage. Providers must justify the percentage used for sewerage.
Utilities are allowed to include costs of other services required in WSS service provision.