They allege that several public water supplies have concerning levels of nitrates present in the samples. In Waimakariri this includes the Oxford Rural No 1 supply.

Council drinking water supplies are tested monthly for nitrates in accordance with the Drinking Water Quality Assurance Rules which sets out source water monitoring requirements.

The results across all Council water supplies are all less than 50 percent of the Maximum Allowable Value (MAV) under the Drinking Water Standards (which aligns with World Health Organisation guidelines), which means they are all less than 5.65 mg/L.

Taumata Arowai as the water services regulator, are responsible for making sure drinking water suppliers provide safe drinking water, have set the MAV for Nitrate-N in drinking water at 11.3mg/L, which is in line with the guidelines from the World Health Organisation and other international standards including the European Union and Australia.

Scheme	Nitrate-N (mg/L)
	Min	Max
Cust	0.30	0.37
Garrymere	0.25	1.17
Kaiapoi	0.70	1.93
Mandeville	2.85	4.23
Ohoka	0.35	0.37
Oxford Rural No. 1	4.30	5.02
Oxford Urban & Rural No. 2	1.76	4.22
Rangiora	0.73	0.92
Waikuku Beach	0.26	0.47
West Eyreton	1.64	2.06
Woodend Pegasus	0.00	0.05