Name: Estimated OWMS density

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Description: Estimated OWMS in Canterbury were mapped in 2025 using a method described in the Journal of Hydrology New Zealand by PHF Science. The layer shows one-hectare grid cells where one or more consented or estimated OWMS are located within the cell. Full details are given in the PHF Science report "Estimating onsite wastewater densities and their associated Total Nitrogen and Total Phosphorus mass loading rates across Waitaha Canterbury" by Qui and Humphries, February 2026.

Copyright Text: PHF Science and Environment Canterbury

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