Government has expressed its commitment to meeting the Sustainable Development Goals, it is yet to announce any specific policy or data strategy for that purpose. Access to drinking water provided by registered suppliers (as opposed to self-supply) can be estimated from the reports into the safety of drinking water from registered suppliers that are published by Institute of Environmental Science and Research (ESR). the Drinking Water online database included records of water supplied to an estimated population of approximately 4.1 million. This indicates that around 85% of the estimated total population of New Zealand at that date receive water from a registered supplier. The balance of the population (approximately 15%) rely upon small self-managed supplies including roof rainwater collection systems. In their National Performance Review 2020–21, Water New Zealand reported that 86% of residential properties are connected to a water network, and 85% connected to a wastewater network. Three waters assets and services Key data about the three waters (water, wastewater, and stormwater) is made publicly available in a National Performance Review undertaken by an industry body Water New Zealand. This review has been undertaken annually since 2008, to provide a performance assessment of service provision and the protection of public health and the environment. The participants in the 2020-21 review included 38 (of 64) service providers, with service areas covering 87% of the New Zealand population. Three waters assets The 38 participants in the 2020-21 review (covering 87% of the population), manage assets with a total book value exceeding $40 billion. A summary of assets is given in the table below. Capital and operational expenditure The 2020-21 National Performance Review provides a summary of capital and operational expenditure on the three waters assets. Affordability Average water and wastewater charges are slightly under $850 per year. However, water and wastewater charges vary significantly around New Zealand. Consumers in some areas are paying over three times as much as for water as those in other areas ($863/year versus $262/year). For wastewater, the range in charges is even greater at over ten times as much ($1,217 versus $116/year). In the most expensive jurisdiction, the average customer will have a water and wastewater bill of over $1,700. For those who depend on the single living-alone superannuation payment, the water and wastewater bill in the most expensive region constitutes over 8% of their income. For those dependent on the sole parent support payment, it