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May 2010This report is one of two prepared for the Ministry for the Environment by NIWA, which update national indicator data for river water quality in New Zealand and help provide the evidence base for policy and decision makers. Read more -
April 2017This report provides an overview of the He Pātaka Wai Ora project, which integrated scientific and matauranga māori monitoring methods to establish the state of freshwater species’ biodiversity and water quality in the Waikouaiti catchment in North Otago. Read more -
November 2019This report prepared by 4Sight Consulting and Market Economics is intended to test the proposed National Policy Statement for Indigenous Biodiversity (NPSIB) before public consultation and help inform stakeholders on the likely impacts, benefits and costs of the NPSIB. Read more -
May 2020This memo assesses whether councils would need to make changes to wastewater treatment in addition to those already identified in the Boffa Miskell report Cost estimates for upgrading wastewater treatment plants to meet objectives of the NPS freshwater. Read more -
May 2018Phormidium is a potentially toxic, mat-forming benthic cyanobacterium found in an increasing number of New Zealand rivers. This report outlines a study which investigated drivers of Phormidium blooms in New Zealand rivers to predict risk of blooms. Read more -
January 2005This report examines the potential demand for water from the Waitak catchment to meet community, urban and town supplies; industrial and commerical uses; and use by recreation and tourism facilities. It includes demands both within and outside the catchment. Read more -
November 2004This report provides an overview of the freshwater ecological values in the Waitaki Catchment based on information collated as geographical information system (GIS) layers. It describes the sources of the GIS data and lists the layers that have been prepared. Read more -
May 2010The report is a stocktake of various approaches used to manage demand for fresh water. It looks at national-level and local council initiatives and assesses how widely the initiatives are being used and their effectiveness in meeting water demand management goals. Read more -
September 2009This report provides an update of results for indicators of groundwater quality in New Zealand. It summarises average water quality at almost 1000 monitoring sites over the period 1995-2008, as well as trends at the same sites within that period of time. Read more -
April 2015One of two reports that assessed the options and implications of using the Macroinvertebrate Community Index (MCI) as an attribute in the National Policy Statement for Freshwater Management. It looked at identifying potential threshold values to define numeric attribute states for MCI. Read more -
May 2018Phormidium is a potentially toxic, mat-forming benthic cyanobacterium found in an increasing number of New Zealand rivers. This report outlines a study which assessed Phormidium toxin levels in the Cardrona (Otago), Mataura (Southland) and Hutt (Wellington) Rivers in 2017. Read more -
May 2000This report describes the approach taken for estimating the water quality 'trigger' values for ecosystem protection used in the 2000 revision of the Australian and New Zealand Guidelines for Fresh and Marine Water Quality (ANZECC 2000). The guidelines were revised in August 2018. Read more -
September 2018This report offers preliminary guidance to water management groups(WMGs), regional councils and other interested parties on how WMGs can be structured and what regional council plans should contain to improve the likelihood that groups will achieve the freshwater outcomes desired by their communities. Read more -
April 2006The Cultural Health Index is a tool that Māori can use to assess and manage waterways in their area. This technical report describes how the Cultural Health Index works scientifically and how it has been developed through testing on different river types and with different iwi. Read more -
June 2016This report provides advice on possible attributes and thresholds relevant to the ecosystem health of intermittently closed and open lakes and lagoons and brackish lakes, and their potential for consideration as part of the National Objectives Framework in the National Policy Statement for Freshwater Management. Read more -
September 2017The Clean Water discussion document proposed changes to the National Policy Statement for Freshwater Management. Following the consultation recommendations on amending the Freshwater NPS were made to the Minister for the Environment. This report provides a summary of decisions the Minister made based on those recommendations. Read more -
February 2017This report has been produced to test potential consequences of setting freshwater objectives for hydro scheme operations. Modelling was undertaken of a selection of various scenarios involving an increase in minimum flows in selected rivers to assess the impact of draft proposals to amend the NPS Freshwater Management on the New Zealand electricity system. Read more -
April 2015One of two technical reports that assessed the options and implications of using the Macroinvertebrate Community Index (MCI) as an attribute in the National Policy Statement for Freshwater Management. It looked at the cause-and-effect relationships between environmental drivers and MCI scores, and the potential response of MCI to changes in catchment management. Read more -
May 2018This research assesses the applicability of environmental classification systems for a potential suspended sediment indicator in the National Objectives Framework. It evaluated the relationship between modelled suspended sediment indicator values and observed values, land cover, and River Environment Classification typologies. This report is an interim deliverable for an ongoing research programme that builds on and refines its findings and will conclude in June 2018. Read more -
February 2018An independent report has shown that water quality for sediment and E. coli have improved over the past 7-10 years in the Horizons Region. There are encouraging signs that local scale interventions are collectively contributing to regional scale water quality improvements. The case study, conducted by Land Water People Ltd and reviewed by NIWA and StatsNZ, was commissioned jointly by the Ministry for the Environment and Horizons Regional Council as a way to understand improving water quality trends in the Manawatū-Whanganui Region. Read more -
December 2020A high level, theme based summary of the reviews undertaken of each regional council or unitary authority’s regional planning instruments for the NPS-FM. Read more -
September 2018The Ministry for the Environment commissioned this research to identify perceived barriers to the adoption of any of the three mechanisms proposed in the draft plan change for the Tutaekuri, Ahuriri, Ngaruroro and Karamu catchments (known as ‘TANK’). Read more -
April 2015Statistical advice about alternative approaches to defining sample statistics for the planktonic cyanobacteria attribute. Read more -
April 2015Statistical advice about alternative approaches to defining thresholds and sample statistics for E. coli attribute. Read more -
September 2019This literature review assesses the primary sources of variability in sediment generation in an urban environment and the impact of urban development on sediment discharges in the short and long term. Read more -
December 2013An assessment of the representativeness and statistical power of state of environment river monitoring sites across New Zealand. Read more -
November 2017This material is incorporated by reference in the National Policy Statement for Freshwater Management 2020. Read more -
December 2018Ministry for the Environment, in partnership with Bay of Plenty Regional Council, commissioned Perrin Ag Consultants Ltd and Manaaki Whenua Landcare Research to assess the farm/orchard-gate economic impact of applying a range of mitigation practices to reduce losses of nitrogen, phosphorus, E. coli and sediment. Read more -
April 2016This business case provides analysis of the regulatory regime for 1080 operational use. Read more
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