Name: Estimated OWMS nitrogen load discharged in drinking water protection zones

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Description: PHF Science estimated the Total Nitrogen loading from OWMS discharges in each CDWPZ using mapped OWMS locations (for consented and estimated OWMS) and applying assumptions from measured nitrogen concentrations in wastewater. Further details are documented in the PHF Science Report "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

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