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The challenges of regulating diffuse agricultural pollution to improve water quality: a science policy perspective on approaches to setting enforceable catchment load limits in New Zealand

Research Archive

The challenges of regulating diffuse agricultural pollution to improve water quality: a science policy perspective on approaches to setting enforceable catchment load limits in New Zealand

Duncan, Ronlyn
Type: Journal Article
Permalink: https://hdl.handle.net/10182/8414
Originally published: 2017-05-01 by University of California Press and available at https://doi.org/10.1525/cse.2017.sc.433549
Rights: © 2017 by the Regents of the University of California. All rights reserved.
Keywords: diffuse pollution; freshwater policy; Canterbury region; agricultural pollution; New Zealand
Fields of Research: 070101 Agricultural Land Management; 050209 Natural Resource Management; 0502 Environmental Science and Management

Abstract:

Worldwide, the cumulative effects of diffuse pollution arising from a range of human activities are diminishing the quality and ecosystem capacity of lakes, rivers, estuaries, and oceans. Devising effective ways to regulate the causes and effects of diffuse pollution is a fraught legal, political, policy, and management challenge given the difficulties in identifying and measuring who is responsible for what, where, and when. In 2011, under its Resource Management Act, 1991, the South Pacific nation of New Zealand introduced national policy to arrest diffuse pollution with a requirement for local government to institute enforceable water quality and quantity limits on all freshwater bodies. The blueprint for these national freshwater policy reforms comes from its South Island region of Canterbury. Canterbury’s regional council has adopted a catchment load approach whereby an overarching limit on nutrient losses from agricultural land is calculated and linked to land use rules to control property-scale agricultural activities. With a focus on the Canterbury region, this case study examines two approaches to establishing a catchment load for diffuse nutrient pollution to link to legal provisions in its regional plan. One is based on a river’s nutrient concentrations and the other relies on predictive modelling. The case study opens important questions about measuring and regulating diffuse pollution and the difficulties faced by policy-makers and regulators in linking numbers to legally binding compliance and enforcement mechanisms, e.g. how to account for lag effects when establishing‘ in-stream’ limits and how to address changes in software when relying on ‘modelled’ limits?

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