Water Quality Tests Results
In this section
Water sources nitrate tests results
- our sources are tested every 2 years
| Source | Nitrate-N (g/m³) | MAV(*) | Test Date |
| Acheron | <0.05 ± 0.034 | 11.3 | Feb-19 |
| Arthurs Pass | <0.05 ± 0.034 | 11.3 | Feb-19 |
| Castle Hill | <0.05 ± 0.034 | 11.3 | Feb-19 |
| Claremont | 1.157 ± 0.094 | 11.3 | Feb-19 |
| Dalethorpe | 0.418 ± 0.046 | 11.3 | Feb-19 |
| Darfield | 5.02 ± 0.39 | 11.3 | Feb-19 |
| Dunsandel | 6.54 ± 0.50 | 11.3 | Feb-19 |
| Edendale | 5.69 ± 0.44 | 11.3 | Feb-19 |
| Glentunnel | 1.002 ± 0.083 | 11.3 | Feb-19 |
| Hartleys Road | 0.613 ± 0.058 | 11.3 | Feb-19 |
| Jowers Road | 2.66 ± 0.21 | 11.3 | Feb-19 |
| Kirwee | 4.37 ± 0.34 | 11.3 | Feb-19 |
| Lake Coleridge | <0.05 ± 0.034 | 11.3 | Feb-19 |
| Leeston - Gallipoli 1 | 0.784 ± 0.069 | 11.3 | Feb-19 |
| Leeston - Lake Road | 0.850 ± 0.073 | 11.3 | Feb-19 |
| Lincoln - Eastfield Drive | 1.154 ± 0.094 | 11.3 | Feb-19 |
| Lincoln - Millstream Drive | 1.77 ± 0.14 | 11.3 | Feb-19 |
| Lincoln - Kildare Terrace | 0.815 ± 0.071 | 11.3 | Feb-19 |
| Lincoln - West Belt | 1.96 ± 0.16 | 11.3 | Feb-19 |
| Prebbleton - St Patricks Well | 0.490 ± 0.050 | 11.3 | Feb-19 |
| Prebbleton - Well 1 | 0.706 ± 0.064 | 11.3 | Feb-19 |
| Prebbleton - Well 3 | 0.581 ± 0.056 | 11.3 | Feb-19 |
| Rakaia Huts | 0.726 ± 0.065 | 11.3 | Feb-19 |
| Raven Drive | 0.933 ± 0.079 | 11.3 | Feb-19 |
| Rolleston - Illinois Dr | 6.98 ± 0.54 | 11.3 | Feb-19 |
| Rolleston - Izone | 2.68 ± 0.21 | 11.3 | Feb-19 |
| Rolleston –Moore St - Well 1 | 1.43 ± 0.12 | 11.3 | Feb-19 |
| Rolleston - Moore St - Well 2 | 2.04 ± 0.16 | 11.3 | Feb-19 |
| Rolleston - Overbury Cres | 4.16 ± 0.32 | 11.3 | Feb-19 |
| Rolleston - Helpet | 1.97 ± 0.16 | 11.3 | Feb-19 |
| Rolleston – Westland Pl | 2.81 ± 0.22 | 11.3 | Feb-19 |
| Rolleston - Baltimore Well | 3.81 ± 0.30 | 11.3 | Feb-19 |
| Sheffield | 4.31 ± 0.33 | 11.3 | Feb-19 |
| Southbridge - High Street | 5.98 ± 0.46 | 11.3 | Feb-19 |
| Southbridge - Taiaroa Place | 4.28 ± 0.33 | 11.3 | Feb-19 |
| Southbridge - St John Street | 2.49 ± 0.20 | 11.3 | Feb-19 |
| Springfield | 1.48 ± 0.12 | 11.3 | Feb-19 |
| Springston | 1.80 ± 0.15 | 11.3 | Feb-19 |
| Tai Tapu | 0.247 ± 0.039 | 11.3 | Feb-19 |
| Taumutu | 1.155 ± 0.094 | 11.3 | Feb-19 |
| Te Pirita | 4.13 ± 0.32 | 11.3 | Feb-19 |
| Upper Selwyn Huts | 0.227 ± 0.038 | 11.3 | Feb-19 |
| West Melton - Elizabeth Allen | 2.22 ± 0.18 | 11.3 | Feb-19 |
| West Melton - Jaqueline Drive | 2.11 ± 0.17 | 11.3 | Feb-19 |
| West Melton - Royston Common Well | 2.48 ± 0.20 | 11.3 | Feb-19 |
Regular bacterial testing
- All our Water Supply schemes are monitored and tested on a regular basis for the presence of bacteria.
- The NZ Drinking Water standards specify: maximum amounts of substances, organisms, contaminants and residues that may be present in drinking water; criteria for demonstrating compliance with standards; remedial action to be taken in the event of non-compliance with standards.
- Over 400 samples are taken on a weekly basis and sent to the lab for testing.
- The water is tested for the following parameters:
Tests | GUIDELINE VALUES (*) | |
|---|---|---|
Total Coliforms | MPN(**) | None specified |
Ecoli (post treatment) | MPN | <1 |
(**) – Mean Probable Number
- The results for E-coli normally take a 24 hour turnaround time.
Annual full chemical testing
- Every year our water sources are also tested for the parameters as noted below. Our tests results are a reflection that the water supply communities generally have access to high quality water.
- Check on our 2019 water sources test results [PDF, 148 KB]
MAV & GUIDELINE VALUES (*) | ||
|---|---|---|
Total Arsenic (g/m³) | As | 0.01 |
Total Cadmium | Cd | 0.004 |
Total Chromium (g/m³) | Cr | 0.05 |
Total Lead (g/m³) | Pb | 0.01 |
Total Nickel (g/m³) | Ni | 0.08 |
pH (pH units) | pH | 7.0 - 8.5 |
Total Alkalinity (g/m³ as CaCO₃) | Alkc45 | n/v |
Free Carbon Dioxide (g/m³ at 25°C) | * | n/v |
Total Hardness (g/m³ as CaCO₃) | THARD | <200 |
Electrical Conductivity (mS/m) | COND20 | n/v |
Electrical Conductivity (µS/cm) | Cond25 | n/v |
Approx Total Dissolved Salts (g/m³) | * | <1000 |
Total Boron (g/m³) | B | 1.4 |
Total Calcium (g/m³) | Ca | n/v |
Total Copper (g/m³) | Cu | 2 |
Total Iron (g/m³) | Fe | <0.2 |
Total Magnesium (g/m³) | Mg | n/v |
Total Manganese (g/m³) | Mn | 0.4 |
Total Potassium (g/m³) | K | n/v |
Total Sodium (g/m³) | Na | <200 |
Total Zinc (g/m³) | Zn | <1.5 |
Chloride (g/m³) | Cl | <250 |
Nitrate-N (g/m³) | NO3 | 11.3 |
Sulphate (g/m³) | SO4 | <250 |
(*) Guideline Values are in accordance with Drinking Water Standards NZ.
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