Water supplies across the Tasman District from Murchison to Collingwood are regularly tested. None of our water supplies have fluoride added.
The report detailing the groundwater quality results and findings from the 2019 survey has been released. Read more about it and see the results here.
We're preparing to test selected bore water quality in Aorere/West Coast area. If you live in the area and use a bore for any purpose, we would love to hear from you to help us complete the first part of our research.
Read more about the survey and how to get involved.
If you would like assistance or further information about water supply quality, please contact us.
In addition to regular testing for public health, people interested in home brewing will find water quality information useful. In addition, Some newer dishwashers also require 'hardness' information.
Note that if you need ‘hardness’ in mmol/l, rather than mg/l as CaCO3 (as reported here, simply divide the reading by 100 to get an approximate answer. (e.g. Richmond 135mg/l becomes 1.35mmol/l).
Chlorinating water ensures it always remains safe to drink.
Chlorine provides excellent protection against the risks of bacteria and from some viruses. We have prepared background material for people who have concerns about chlorination.
The National Drinking Water Standards require regular testing to be done at all of the plants and in the zones on a set schedule.
The testing we do varies depending on the plant, but generally involves taking a sample to be tested in the lab for E.coli and other on-site tests such as chlorine level. Zone samples might be taken at reservoirs or at the farthest reach of that system.
The main lab testing is for E.coli, but we also test for lead and nitrate. On site we also regularly test for pH, chlorine and turbidity (cloudiness of the water).
We can also monitor the performance of every treatment plant online through our telemetry system. Should anything go wrong, an alarm will be generated in the system and this will be texted to the on call person to let them know straight away.
Diagram of the Brightwater / Hope water supply
Brightwater Water Supply covers the urban Brightwater area, and extends along Main Road Hope to the southern side of Bateup Road in Richmond.
Water is taken from three bores close to the Wairoa River in Brightwater. The water is chlorinated for disinfection purposes.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
Approx 7 |
|
|
Turbidity (cloudiness) |
<0.2 |
NTU |
|
Hardness (total) |
50 |
mg/l as CaCO3 |
|
Calcium |
10 |
mg/l |
|
Magnesium |
6.1 |
mg/l |
|
Manganese |
<0.0005 |
mg/l |
|
Nitrate |
0.3-0.5 |
mg/l as Nitrate-Nitrogen |
|
Lead |
<0.001 |
mg/l |
Diagram of the Collingwood water supply
Collingwood Water Supply takes water from a bore near the Aorere River. The water is aerated and passes through a lime filter for pH control. The water is chlorinated for disinfection purposes. The scheme is fully metered except for one connection
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
6.5 |
|
|
Turbidity (cloudiness) |
<0.2 |
NTU |
|
Hardness (total) |
25-30 |
mg/l as CaCO3 |
|
Calcium |
9 |
mg/l |
|
Magnesium |
1.4 |
mg/l |
|
Manganese |
0.005 |
mg/l |
|
Nitrate |
0.25 |
mg/l as Nitrate-Nitrogen |
|
Chloride |
8.5 |
mg/l |
Diagram of the Dovedale rural water supply
The Dovedale Rural Water Supply takes water from a creek in Dovedale.
Water is supplied to the rural Dovedale area, Upper Moutere and Rosedale Road. The water passes through a sedimentation tank before being chlorinated. Water is supplied entirely by restricted connections to private water tanks.
The Dovedale supply has a permanent boil water notice in place as the required concentration of chlorine cannot always be maintained to the end of the network, especially when the creek is in flood and raw water becomes dirty. There are no units being sold on this supply.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
6.5 |
|
|
Turbidity (cloudiness) |
Generally 5-10 |
NTU |
|
Hardness (total) |
20 |
mg/l as CaCO3 |
|
Calcium |
4.5 |
mg/l |
|
Magnesium |
2 |
mg/l |
|
Manganese |
0.013 |
mg/l |
|
Nitrate |
<0.002 |
mg/l as Nitrate-Nitrogen |
|
Nitrite |
<0.002 |
mg/l as Nitrite-Nitrogen |
Diagram of the Eighty-Eight Valley rural water supply
Eighty-Eight Valley Rural Water supply takes water from a creek close to the southern end of Eighty-Eight Valley Road.
Water is supplied to the rural 88 Valley Road area and as far north as Mount Heslington Road.
The water has coarse filtration and then is chlorinated.
Water is supplied entirely by restricted connections to private water tanks. No new units are being sold on this water supply.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
6.7 |
|
|
Turbidity (cloudiness) |
Generally <1 |
NTU |
|
Hardness (total) |
46 |
mg/l as CaCO3 |
|
Calcium |
12.5 |
mg/l |
|
Magnesium |
3.5 |
mg/l |
|
Manganese |
<0.0005 |
mg/l |
|
Nitrate |
0.03 |
mg/l as Nitrate-Nitrogen |
|
Nitrite |
<0.002 |
mg/l as Nitrite-Nitrogen |
Diagram of the Kaiteriteri water supply
Kaiteriteri water supply takes water from a deep bore in Riwaka.
Water is supplied to Main Road Riwaka, most of Riwaka-Kaiteriteri Road and as far north as Kaiteriteri-Sandy Bay Road.
The water is currently on trail chlorination. All connections are metered.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
6.2 |
|
|
Turbidity (cloudiness) |
<0.2 |
NTU |
|
Hardness (total) |
59 |
mg/l as CaCO3 |
|
Calcium |
14 |
mg/l |
|
Magnesium |
5.8 |
mg/l |
|
Manganese |
<0.00053 |
mg/l |
|
Iron |
<0.02 |
mg/l |
|
Chloride |
5.3 |
mg/l |
|
Nitrate |
2-3 |
mg/l as Nitrate-Nitrogen |
|
LSI |
-2.5 |
|
Diagram of the Motueka water supply
Motueka water supply covers only a third of the town, with many properties having their own private bore water supply (sometimes as well as a council supply connection).
The Council supply takes its water from deep groundwater bores and is currently untreated.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
6-6.2 |
|
|
Turbidity (cloudiness) |
<0.2 |
NTU |
|
Hardness (total) |
80 |
mg/l as CaCO3 |
|
Total Calcium |
22 |
mg/l |
|
Chloride |
6.5 |
mg/l |
|
Magnesium |
6.4 |
mg/l |
|
Sulphate |
10.6 |
mg/l |
|
Manganese |
0.00129 |
mg/l |
|
Total iron |
>0.02 |
mg/l |
|
Nitrate |
1.5-2 |
mg/l as Nitrate-Nitrogen |
|
LSI |
-1.1 |
|
|
Reactive silica |
14.2 |
mg/l as SiO2 |
|
Total alkalinity |
68 |
mg/l as CaCO3 |
|
Lead |
<0.001 |
mg/l |
Diagram of the Murchison water supply
Murchison water supply takes it water from two bores close to the Matakitaki River.
The water is aerated for pH control and then chlorinated and UV treated for disinfection purposes.
The scheme is almost fully metered.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
6.7 |
|
|
Turbidity (cloudiness) |
<0.1 |
NTU |
|
Hardness (total) |
51 |
mg/l as CaCO3 |
|
Dissolved Calcium |
15 |
mg/l |
|
Magnesium |
3.3 |
mg/l |
|
Total alkalinity |
39 |
mg/l as CaCO3 |
|
Manganese |
0.002 |
mg/l |
|
Nitrate |
4.3 |
mg/l as Nitrate-Nitrogen |
|
LSI |
-1.2 |
|
Diagram of the Pōhara water supply
The Pōhara water supply takes water from a creek in Pōhara Valley. The water is filtered and chlorinated. Only the Pōhara Valley area is supplied, with an extension to the Pōhara Camp.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
6.5 |
|
|
Turbidity (cloudiness) |
2-3 |
NTU |
|
Hardness (total) |
26 |
mg/l as CaCO3 |
|
Calcium |
6.4 |
mg/l |
|
Magnesium |
2.4 |
mg/l |
|
Manganese |
0.014 |
mg/l |
|
Nitrate |
1 |
mg/l as Nitrate-Nitrogen |
|
Nitrite |
<0.002 |
mg/l as Nitrite-Nitrogen |
Diagram of the Redwood Valley rural water supply
Redwood Valley Rural Water Supply takes water from three shallow bores in the Redwood Valley/ Waimea plains area.
The water is aerated for pH control and then chlorinated for disinfection purposes.
There are currently no new units being sold on this supply.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
6.2 |
|
|
Turbidity (cloudiness) |
<1 |
NTU |
|
Hardness (total) |
56 |
mg/l as CaCO3 |
|
Calcium |
7.8 |
mg/l |
|
Magnesium |
8.8 |
mg/l |
|
Manganese* |
0.003 to 0.56 |
mg/l |
|
Aluminium |
0.010 |
mg/l |
|
Alkalinity |
46 |
mg/l as CaCO3 |
|
Copper |
0.001 |
mg/l |
|
Chloride |
15 |
mg/l |
|
Iron * |
<0.002 to 0.9 |
mg/l |
|
Lead |
<0.003 |
mg/l |
|
Sodium |
13 |
mg/l |
|
Sulphate |
14 |
mg/l |
|
Nitrate |
0.7 |
mg/l as Nitrate-Nitrogen |
(*treated water and raw water respectively)
Diagram of the Richmond water supply
Richmond water supply covers properties from Wakatu Industrial Estate in the north to Haycock Road rural extension in the south. It includes the Richmond and Waimea Industrial zones.
The ‘Richmond zone’ covers the urban area as far as Templemore Drive and Arbor Lea Ave. The supply extends south to Bateup Road, and includes a rural extension along Hill Street South. Connections are metered in the urban area, with restrictors in the rural area.
The ‘Waimea Industrial Zone’ covers the area around Champion Road, south to Templemore drive and Heritage Crescent and Arbor Lea and includes the Daelyn Drive area (in Nelson). It also includes Wakatu Industrial Estate, McPherson St, Fittal St and Cargill Place. This zone is fully metered.
Water is sourced from two sets of bores which are mixed in-line, disinfected with UV and pH corrected using caustic soda. Chlorine is not added to this supply, except in emergency circumstances.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
Approx 7 |
|
|
Turbidity (cloudiness) |
<0.2 |
NTU |
|
Hardness (total) |
105 |
mg/l as CaCO3 |
|
Total alkalinity |
79 |
mg/l as CaCO3 |
|
Calcium |
15 |
mg/l |
|
Total iron |
<0.02 |
mg/l |
|
Chloride |
13 |
mg/l |
|
Magnesium |
16 |
mg/l |
|
Manganese |
<0.0005 |
mg/l |
|
Nitrate |
4.7 |
mg/l as Nitrate-Nitrogen |
|
LSI |
-0.9 |
|
|
Sulphate |
12 |
mg/l |
|
Sodium |
14 |
mg/l |
|
Reactive silica |
21 |
mg/l as SiO2 |
Diagram of the Tapawera water supply
Tapawera Water Supply takes water from two bores close to the Motueka River.
The water has lime added for pH control and is chlorinated and UV treated for disinfection purposes.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
6.5 |
|
|
Turbidity (cloudiness) |
<0.2 |
NTU |
|
Hardness (total) |
69 |
mg/l as CaCO3 |
|
Calcium |
7.5 |
mg/l |
|
Magnesium |
11.9 |
mg/l |
|
Manganese |
<0.0005 |
mg/l |
|
Nitrate |
1.77 |
mg/l as Nitrate-Nitrogen |
|
NItrite |
<0.002 |
mg/l as Nitrite-Nitrogen |
Diagram of the Upper Takaka water supply
Upper Takaka Water Supply takes water from a creek on Takaka Hill.
The water undergoes sedimentation, filtration, and UV disinfection. There is no chlorine residual in this supply.
Please contact us if you'd like more information on the Upper Takaka supply.
Diagram of the Māpua/Ruby Bay water supply
This supply covers the Māpua Urban area (mostly metered) and Ruby Bay rural area (mostly restrictors).
The zone extends from Old Coach Road at its westernmost point, to Permin Road, Tasman at its northern point.
Water is taken from bores, chlorinated for disinfection and pH corrected using lime.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
6.5 |
|
|
Turbidity (cloudiness) |
<0.1 |
NTU |
|
Hardness (total) |
Approx 70 |
mg/l as CaCO3 |
|
Calcium |
13 |
mg/l |
|
Magnesium |
8.7 |
mg/l |
|
Iron |
<0.002 |
mg/l |
|
Manganese |
<0.001 |
mg/l |
|
Nitrate |
0.6-1.8 |
mg/l as Nitrate-Nitrogen |
|
LSI |
-2.1 |
|
|
Sulphate |
6.8 |
mg/l |
|
Alkalinity |
56 |
mg/l |
Diagram of the Wakefield water supply
The Wakefield water supply covers the urban Wakefield area, Pigeon Valley and extends along Main Road Spring Grove, as far as the Spring Grove church.
Water is taken from a shallow well and infiltration gallery close to the Wai-iti River in Wakefield.
The water is aerated for pH control and chlorinated for disinfection purposes.
A new water supply for Wakefield, with water taken from bores in Spring Grove is in the Long Term Plan 2018-2028. Water quality investigation is underway.
| Parameter | Concentration | Units |
|---|---|---|
|
pH |
6.5 |
|
|
Turbidity (cloudiness) |
<0.3 |
NTU |
|
Hardness (total) |
40 |
mg/l as CaCO3 |
|
Calcium |
10 |
mg/l |
|
Magnesium |
3.3 |
mg/l |
|
Manganese |
<0.0005 |
mg/l |
|
Nitrate |
2 |
mg/l as Nitrate-Nitrogen |
|
Nitrite |
<0.002 |
mg/l as Nitrite-Nitrogen |
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