Layers:

Layer: Estimated and consented OWMS in Canterbury (as at 2025) (0)

Name: Estimated and consented OWMS in Canterbury (as at 2025)

Display Field: district_name

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: Consented OWMS were captured from Environment Canterbury Consents records as at 2025. Estimated OWMS were derived by PHF Science from analysis of properties with buildings larger than 10 square metres which had no consented OWMS and were not connected to a centralised wastewater reticulation network from a territorial authority. A full description of the methodology is provided in the Journal of Hydrology New Zealand and 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 and Environment Canterbury

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Use Standardized Queries: true

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Extent:
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YMin: 5015524.6639
XMax: 1687732.9791
YMax: 5354919.2074
Spatial Reference: 2193  (2193)  LatestVCSWkid(0)



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• ValuationNo ( type: esriFieldTypeString, alias: Valuation No, length: 15 )
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Layer: Estimated OWMS density (1)

Name: Estimated OWMS density

Display Field: category

Type: Feature Layer

Geometry Type: esriGeometryPolygon

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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Supported Query Formats: JSON, geoJSON, PBF

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Supports Statistics: true

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Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:
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YMin: 5015464.9276
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YMax: 5354964.9276
Spatial Reference: 2193  (2193)  LatestVCSWkid(0)



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Layer: Estimated OWMS by district (TA) (2)

Name: Estimated OWMS by district (TA)

Display Field: TA_name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: OWMS counts were derived from Environment Canterbury resource consents records and the mapping of estimated OWMS using a method described in the Journal of Hydrology New Zealand. PHF Science estimated Total Nitrogen and Total Phosphorus loading from OWMS discharges in each District. 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 (formerly ESR)

Default Visibility: false

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

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Extent:
XMin: 1323818.0269
YMin: 4950306.2077
XMax: 1688162.0909000002
YMax: 5360240.0554
Spatial Reference: 2193  (2193)  LatestVCSWkid(0)



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• SUM_TN_loading_per_year_kg ( type: esriFieldTypeDouble, alias: SUM TN loading (kg/year) )

Layer: Estimated OWMS by locality (3)

Name: Estimated OWMS by locality

Display Field: additional_name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: These layers have information on the estimated number of non-consented on-site wastewater systems in Canterbury. Created April 2023.Consented OWMS in Drinking Water Protection Zones (as at November 2023)The layer shows the locations of CONSENTED On-site Wastewater Management Systems (OWMS) in Drinking Water Protection Zones in the Canterbury region (as at November 2023).Estimated OWMS in CanterburyThe layer shows the locations of estimated (non-consented) On-site Wastewater Management Systems (OWMS) in Canterbury region.Estimated OWMS in Drinking Water Protection Zones (as at August 2023)This layer shows the estimated (non-consented) OWMS in Drinking Water Protection Zones as at August 2023.Estimated OWMS in each district (TA)This layer has information on the estimated number of non-consented on-site wastewater systems for each district in Canterbury.Estimated OWMS in SuburbsThis layer has information on the estimated number of non-consented on-site wastewater systems for each suburb in Canterbury.Further Metadata: For information on how this GIS layer was developed refer to the Estimating On-site WastewaterManagement System (OWMS) locations in Canterbury Region report conducted by ESR .For more information please visit the On-site wastewater management systems page on the Environment Canterbury Website.

Copyright Text:

Default Visibility: false

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Supported Query Formats: JSON, geoJSON, PBF

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Extent:
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YMin: 5004764.9276
XMax: 1688162.0909000002
YMax: 5360238.4655
Spatial Reference: 2193  (2193)  LatestVCSWkid(0)



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Layer: Estimated OWMS nitrogen load discharged in drinking water protection zones (4)

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

Display Field: SUPPLY_NAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

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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YMin: 5020155.7158
XMax: 1674625.9071000004
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Spatial Reference: 2193  (2193)  LatestVCSWkid(0)



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Layer: Estimated OWMS phosphorus load discharged in drinking water protection zones (5)

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

Display Field: SUPPLY_NAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: PHF Science estimated the Total Phosphorus loading from OWMS discharges in each CDWPZ using mapped OWMS locations (for consented and estimated OWMS) and applying assumptions from measured phosphorus 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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Spatial Reference: 2193  (2193)  LatestVCSWkid(0)



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