Drinking water standards and testing

The Ministry of Health is responsible for setting the New Zealand Drinking Water Standards, which specify the maximum amount of different chemical determinands including Nitrates that are safe to have in our drinking water—known as Maximum Allowable Values (MAV).

We actively monitor Nitrate levels for all water sources across the District.

  • Annual: SDC monitor Nitrate as Nitrate‐N on annual basis. MAV for Nitrate‐N is 11 mg/L.
  • Additional sampling (monthly basis) is being carried out for the schemes which have Nitrate‐N greater or equal to ½ MAV (5.5 mg/L)
  • Monthly: SDC monitor water for Nitrate-N (MAV=11mg/L) and Nitrate (MAV=50 mg/L) and Nitrite-N (MAV = 0.6mg/L) on monthly sampling.
  • The short-term exposure MAV for Nitrate has been established to protect against methaemoglobinaemia in bottle-fed infants.
  • It is important to note that only Nitrate test results are shown on our website.
  • We currently have five water sources (Illinois, Overbury, Dunsandel, Edendale, Darfield) that are subject to monthly testing and you can find the results in the links below.

Annual Nitrate Test Results: You can see the results for all water sources in the table below.

Monthly Nitrate Test Results: You can see the results in the links below.

Rolleston - Illinois
Rolleston - Overbury
Dunsandel
Edendale
Darfield

6-Monthly Nitrate Test for Rolleston Reticulation: You can see the results in the link below.

Rolleston Reticulation Nitrate Test Results

Nitrates in our water - action being taken

Environment Canterbury is the regulatory authority responsible for addressing Nitrate contamination in waterways and groundwater in Canterbury. We work with Environment Canterbury and other Councils on this matter. You can find a breakdown of the work being carried out by Environment Canterbury.

Annual Nitrate Tests Results for water sources

SourceNitrate-N (g/m3)MAVTest date

Acheron Source

<0.05

11.3

Mar-21

Arthurs Pass Source

<0.05

11.3

Mar-21

Castle Hill Source

<0.05

11.3

Mar-21

Claremont Source

1.21

11.3

Mar-21

Dalethorpe Source

0.39

11.3

Mar-21

Darfield Source - Bore 1

5.7

11.3

Mar-21

Darfield Source - Bore 2

5.1

11.3

Mar-21

Dunsandel Source

6.4

11.3

Mar-21

Edendale Source

6.1

11.3

Mar-21

Horoata Source - Glentunnel Intake

0.22

11.3

Mar-21

Malvern Hills, Hartleys Rd Source

0.38

11.3

Mar-21

Jowers Rd Source

2.4

11.3

Mar-21

Kirwee Source

5

11.3

Mar-21

Lake Coleridge Source

<0.50

11.3

Mar-21

Leeston - Gallipoli 1

0.89

11.3

Mar-21

Leeston - Lake Rd

1.15

11.3

Mar-21

Leeston - Dunsandel Rd

1.05

11.3

Mar-21

Lincoln - Eastfield Dr

1.25

11.3

Mar-21

Lincoln - Kildare Tce

1.78

11.3

Mar-21

Lincoln - West Belt

1.71

11.3

Mar-21

Lincoln - Veuve Drive

1.19

11.3

Mar-21

Prebbleton - St Patricks Well

0.58

11.3

Mar-21

Prebbleton - Shands Rd

0.46

11.3

Mar-21

Prebbleton - Well 1

0.52

11.3

Mar-21

Prebbleton - Well 3

0.63

11.3

Mar-21

Rakaia Huts Source

0.762

11.3

Mar-21

Raven Drive Source

1.34

11.3

Mar-21

Rolleston - Baltimore Well

3.5

11.3

Mar-21

Rolleston - Illinois Dr

7

11.3

Mar-21

Rolleston - Izone

3

11.3

Mar-21

Rolleston - Moore St - Well 1

1.43

11.3

Mar-21

Rolleston - Moore St - Well 2

3.6

11.3

Mar-21

Rolleston - Overbury Cres

4.6

11.3

Mar-21

Rolleston - Helpet Well 1

1.71

11.3

Mar-21

Rolleston - Helpet Well 2

2.8

11.3

Mar-21

Rolleston - Westland Place

3

11.3

Mar-21

Sheffield Source

2.8

11.3

Mar-21

Southbridge -St John St

2.9

11.3

Mar-21

Springfield Source

0.66

11.3

Mar-21

Springston Source

1.85

11.3

Mar-21

Tai Tapu Source

0.29

11.3

Mar-21

Taumutu Source

1.33

11.3

Mar-21

Te Pirita Source

4.04

11.3

Mar-21

Upper Selwyn Huts Source

0.25

11.3

Mar-21

West Melton - Elizabeth Allen

1.93

11.3

Mar-21

West Melton - Jacqueline Dr

1.44

11.3

Mar-21

West Melton - Royston Common Well

1.4

11.3

Mar-21

West Melton - Ridgeland Way

1.95

11.3

Mar-21