Water Services (Drinking Water Standards for New Zealand) Regulations 2022

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2022/168

Coat of Arms of New Zealand

Water Services (Drinking Water Standards for New Zealand) Regulations 2022

Rt Hon Dame Helen Winkelmann, Administrator of the Government

Order in Council

At Wellington this 7th day of June 2022

Present:
Her Excellency the Administrator of the Government in Council

These regulations are made under section 47 of the Water Services Act 2021

(a)

on the advice and with the consent of the Executive Council; and

(b)

on the recommendation of the Minister of Local Government; and

(c)

following consultation in accordance with section 53 of that Act.

Regulations

1 Title

These regulations are the Water Services (Drinking Water Standards for New Zealand) Regulations 2022.

2 Commencement

These regulations come into force on 14 November 2022.

3 Interpretation

In these regulations, unless the context otherwise requires,—

determinand means a substance or characteristic that is determined or estimated in drinking water

MAV means maximum acceptable value.

4 Drinking Water Standards

(1)

The determinands listed in the first column of each table in the Schedule must not exceed the applicable maximum acceptable value specified in the second column.

(2)

The maximum acceptable values in the second column of each table in the Schedule must be calculated in accordance with the notes (if any) set out in the third column.

5 Revocation

The Drinking-water Standards for New Zealand 2005 (revised 2018) are revoked.

Schedule Drinking Water Standards for New Zealand

r 4

Table 1 Maximum acceptable values for microbiological determinands

DeterminandMaximum acceptable valueNotes
Escherichia coli Less than 1 in 100 mL of sample
Total pathogenic protozoaLess than 1 verified infectious (oo)cyst per 100 L of sample

Table 2 Maximum acceptable values for inorganic determinands

DeterminandMaximum acceptable value (mg/L unless otherwise stated)Notes
Aluminium1
Antimony0.02
Arsenic0.01
Barium1.5
Boron2.4
Bromate0.01
Cadmium0.004
Chlorate0.8
Chlorine5Expressed in mg/L as Cl2
Chlorite0.8
Chromium0.05Total chromium content
Copper2
Cyanide0.6
Cyanogen chloride0.4
Fluoride1.5
Lead0.01
Manganese0.4
Mercury0.007Inorganic mercury only
Monochloramine3Expressed in mg/L as Cl2
Nickel0.08
Nitrate, short-term50Expressed in mg/L as NO3, or 11.3 mg/L as NO3-N
Nitrite, short-term3Expressed in mg/L as NO2
Nitrate and nitriteΣ ratio < 1The sum of the ratio of the concentrations of nitrate and nitrite to each of their respective MAVs must not exceed 1
Perchlorate0.08
Selenium0.04
Uranium0.03

Table 3 Maximum acceptable values for organic determinands

DeterminandMaximum acceptable value (mg/L unless otherwise stated)Notes
Acrylamide0.0005
Alachlor0.02
Aldicarb0.01
Aldrin + dieldrin0.00004The sum of both, not individually
Anatoxins (includes congeners anatoxin-a, homoanatoxin-a, dihydroanatoxin-a, dihydrohomoanatoxin-a)0.006 Expressed as anatoxin-a toxicity equivalents
Atrazine0.1Sum of atrazine and its metabolites
Azinphos methyl0.1
Benzene0.01
Benzo(α)pyrene0.0007
Bromacil0.4
Bromodichloromethane0.06
Bromoform0.1
Carbofuran0.008
Carbon tetrachloride0.005
Chlordane0.0002
Chloroform0.4
Chlorotoluron0.04
Chlorpyriphos0.04
Cyanazine0.0007
Cylindrospermopsin0.0008 Expressed as cylindrospermopsin toxicity equivalents
2,4-D0.04
2,4-DB0.1
DDT + isomers0.001Sum of all isomers
Di(2-ethylhexyl)phthalate0.009
1,2-dibromo-3-chloropropane0.001
Dibromoacetonitrile0.08
Dibromochloromethane0.15
1,2-dibromoethane0.0004
Dichloroacetic acid0.05
Dichloroacetonitrile0.02
1,2-dichlorobenzene1.5
1,4-dichlorobenzene0.4
1,2-dichloroethane0.03
1,2-dichloroethene0.06Total of cis and trans isomers
Dichloromethane0.02
1,2-dichloropropane0.05
1,3-dichloropropene0.02Total of cis and trans isomers
Dichlorprop0.1
Dimethoate0.008
1,4-dioxane0.05
Diuron0.02
EDTA (edetic acid)0.7
Endrin0.001
Epichlorohydrin0.0005
Ethylbenzene0.3
Fenoprop0.01
Hexachlorobutadiene0.0007
Hexazinone0.4
Hydroxytrazine0.3
Isoproturon0.01
Lindane0.002
MCPA0.8
Mecoprop0.01
Metalaxyl0.3
Methoxychlor0.02
Metolachlor0.01
Metribuzin0.07
Microcystins/nodularins0.001 Expressed as microcystin-LR toxicity equivalents
Molinate0.007
Monochloroacetic acid0.02
Nitrilotriacetic acid (NTA)0.2
N-Nitrosodimethylamine (NDMA)0.0001
Oryzalin0.4
Oxadiazon0.2
Pendimethalin0.02
Pentachlorophenol0.009
PFHxS + PFOS0.00007 PFHxS = perfluorohexane sulfonate  PFOS = perfluorooctane sulfonate  MAV is the sum of both
PFOA0.00056 PFOA = perfluorooctanoic acid
Picloram0.2
Pirimiphos-methyl0.1
Primisulfuron-methyl0.9
Procymidone0.7
Propazine0.07
Pyriproxyfen0.4
Saxitoxins0.003Expressed as saxitoxin-equivalents
Simazine0.002
Sodium dichloroisocyanurate (as cyanuric acid)40
Styrene0.03
2,4,5-T0.01
Terbacil0.04
Terbuthylazine0.008
Tetrachloroethene0.05
Thiabendazole0.4
Toluene0.8
Trichloroacetic acid0.2
Trichloroethene0.03
2,4,6-trichlorophenol0.2
Triclopyr0.1
Trifluralin0.03
Trihalomethanes (THMs)Σ ratio < 1The sum of the ratio of the concentration of each THM to its respective MAV must not exceed 1
Vinyl chloride0.0003
Xylenes (total)0.6
1080 long-term0.0035
1080 short-term0.035

Table 4 Maximum acceptable values for radiological determinands

DeterminandMaximum acceptable value (Bq/L)Notes
Radon100
Total alpha activity0.5Bq/L excluding radon
Total beta activity1Bq/L excluding potassium-40

Michael Webster,
Clerk of the Executive Council.

Explanatory note

This note is not part of the regulations, but is intended to indicate their general effect.

These regulations, which come into force on 14 November 2022, set the Drinking Water Standards for New Zealand. The standards set limits for the concentration of determinands in drinking water. The limits are referred to as maximum acceptable values (MAVs). The MAVs for any determinand must not be exceeded at any time. Under the Water Services Act 2021, all drinking water suppliers must ensure that the drinking water they supply complies with the standards, regardless of the nature of the source water used or the number of people served by the supply.

The standards are based in part on the World Health Organization Guidelines for drinking-water quality: fourth edition incorporating the first and second addenda. The standards revoke and replace the Drinking-water Standards for New Zealand 2005 (revised 2018).

Issued under the authority of the Legislation Act 2019.

Date of notification in Gazette: 9 June 2022.

These regulations are administered by the Department of Internal Affairs.