Priority 2 Determinands

Microbiological contaminants should be monitored for in all supplies and hence are known as Priority 1 determinands. A second level, defined as Priority 2 determinands, do not have to be measured in every supply but are specified for only those supplies which the Ministry of Health believes exceed half the maximum allowable value (MAV) for a particular health-significant determinand.

Only supplies with populations of 100 or more have been assessed, and the population must be at least 500 before a Priority 2 determinand is officially assigned and appears in the Register of Community Drinking-Water Supplies in New Zealand (and hence have "Test for" in these web pages.)

Currently Assigned Official Priority 2 Determinands

This list will be updated weekly from the National DWO database.

Treatment Plants

Click on an abbreviation to see a list of Supplies receiving water from Plants with this P2 Determinand

Abbrev.	Determinand	Plants	for Zones	in Supplies	Zone Pop
As	Arsenic	3	3	2	10,393
F	Fluoride	50	137	43	2,514,205
MAVNOx	MAV sum ratio for NO3 and NO2	1	1	1	3,720
NO3	Nitrate (as NO3)	4	4	4	42,048
Rn222	Radon-222	1	1	1	828
Talpha	Total Alpha Activity	1	1	1	116

Distribution Zones

Click on an abbreviation to see a list of Distribution Zones with this P2 Determinand

Abbreviation	Determinand	Assigned	Population
As	Arsenic	8	24,510
CHBCl2	Bromodichloromethane	3	21,564
Cu	Copper	1	400
DCA	Dichloroacetic acid	5	8,160
Pb	Lead	5	16,867
Mn	Manganese	1	570
MAVHAA	MAV sum ratio for HAAs	13	90,352
MAVTHM	MAV sum ratio for THMs	19	139,566
CACA	Monochloroacetic Acid	1	2,700
NO3	Nitrate (as NO3)	12	19,109
TCA	Trichloroacetic acid	4	4,713

Source: Drinking Water Online, as extracted from the National DWO database on 3 May 2021.