For more than 20 years, urban water utility (UWU) regulators have been using key performance indicators to monitor water supply services. In many circumstances, the empirical methods used to rank a UWU performance are different between country's regulators, although the benchmarking basics are the same. The diversity of benchmarking methods limits the sharing of management strategies between countries. This paper presents the consistency analysis of the performance score method used by the Energy and Water Utilities Regulatory Authorities of Tanzania and network data envelopment analysis (NDEA), NDEA is appropriate for this purpose because of its demonstrated flexibility in applications with diverse production environments. Thus, employing the proposed methods benchmarking strategies to assess a UWU efficiency- and management-specific within and between countries. The assessment shows that NDEA outperforms empirical method, the regulator using the proposed NDEA will benchmark a UWU efficiency under a yardstick competition regime and at the same time identify the most efficient and weak UWUs using pure variable values. This innovation monitor UWU performance progress and promotes sharing of quality management strategies between UWUs and countries.

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