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The Water Supply (Water Quality) Regulations (Northern Ireland) 2017

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Regulation 5

SCHEDULE 1PRESCRIBED CONCENTRATIONS AND VALUES

Wholesomeness

TABLE A

MICROBIOLOGICAL PARAMETERS

(1) Item(2) Parameters(3) Concentration or Value (maximum)(4) Unit of measurement(5) Point of Compliance(1)
(1)

Where water is supplied from a tanker see regulation 5(3)(a)

(2)

Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)).

Part I: Directive requirements
1.Enterococci0number/100mlConsumers’ taps
2.Escherichia coli (E. coli)0number/100mlConsumers’ taps
Part II: National requirements
1.Coliform bacteria0number/100mlService reservoirs(2) and water treatment works
2.Escherichia coli (E. coli)0number/100mlService reservoirs and water treatment works

TABLE B

CHEMICAL PARAMETERS

(1) Item(2) Parameters(3) Concentration or Value (maximum)(5) Units of Measurement(6) Point of compliance
(1)

The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.

(2)

Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value.

(3)

See also regulation 8(5).

(4)

See also regulation 5(3)(d).

(5)

See the definition of “pesticides and related products” in regulation 2.

(6)

The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide.

(7)

“Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.

(8)

The specified compounds are benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.

(9)

The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.

(10)

The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.

Part I: Directive requirements
1.Acrylamide(1)0.10µg/l
2.Antimony5.0µg/lConsumers’ taps
3.Arsenic10µg/lConsumers’ taps
4Benzene1.0µg/lConsumers’ taps
5Benzo(a)pyrene0.010µg/lConsumers’ taps
6Boron1.0mg/lConsumers’ taps
7Bromate(2)10µg/lConsumers’ taps
8Cadmium5.0µg/lConsumers’ taps
9Chromium50µg/lConsumers’ taps
10Copper(3)2.0mg/lConsumers’ taps
11Cyanide50µg/lConsumers’ taps
121, 2 dichloroethane3.0µg/lConsumers’ taps
13Epichlorohydrin(1)0.10µg/l
14Fluoride1.5mg/lConsumers’ taps
15Lead(3)10µg/lConsumers’ taps
16Mercury1.0µg/lConsumers’ taps
17Nickel(3)20µg/lConsumers’ taps
18Nitrate(4)50mg/lConsumers’ taps
19Nitrite(4)0.50mg/lConsumers’ taps
0.10Treatment works
20

Pesticides(5) (6)

Aldrin

Dieldrin

Heptachlor

Heptachlor epoxide

0.030µg/lConsumers’ taps
other pesticides(5) (6)0.10µg/lConsumers’ taps
21Pesticides: Total(7)0.50µg/lConsumers’ taps
22Polycyclic aromatic hydrocarbons(8)0.10µg/lConsumers’ taps
23Selenium10µg/lConsumers’ taps
24Tetrachloroethene and Trichloroethene(9)10µg/lConsumers’ taps
25Trihalomethanes: Total(10)100µg/lConsumers’ taps
26Vinyl chloride(1)0.50µg/l
Part II: National requirements
1.Aluminium200µg/lConsumers’ taps
2.Colour20mg/l Pt/CoConsumers’ taps
3.Iron200µg/lConsumers’ taps
4.Manganese50µg/lConsumers’ taps
5.OdourAcceptable to consumers and no abnormal changeConsumers’ taps
6.Sodium200mg/lConsumers’ taps
7.TasteAcceptable to consumers and no abnormal changeConsumers’ taps
8.Tetrachloromethane3µg/lConsumers’ taps
9.Turbidity4NTUConsumers’ taps

Regulation 2 and 5

SCHEDULE 2INDICATOR PARAMETERS

(1) Item(2) Parameters(3) Specification Concentration or Value (maximum unless otherwise stated) or State(4) Units of Measurement(5) Point of monitoring
(1)

May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.

(2)

The water should not be aggressive.

(3)

Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration.

(4)

Excluding tritium, potassium-40, radon and radon decay products.

(5)

Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required.

(6)

Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment.

(7)

If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required.

1Ammonium0.50mg/lConsumers’ taps
2Chloride(1) (2)250mg/lSupply point
3Clostridium perfringens (including spores)(1)0Number/100mlSupply point
4Coliform bacteria0Number/100mlConsumers’ taps
5Colony countsNo abnormal changeNumber/1ml at 22°C Number/1ml at 37°CConsumers’ taps, service reservoirs and treatment works
6Conductivity(1) (2)2500µS/cm at 20°CSupply point
7Hydrogen ion(2)9.5pH unitsConsumers’ taps
6.5 (minimum)
8Radon (for radioactivity)(1) (3) (6)100Bq/lSupply point
9Sulphate(1) (2)250mg/lSupply point
10Indicative dose (for radioactivity)(1) (4) (6) (7)0.10mSvSupply point
11Total organic carbon (TOC)(1)No abnormal changemg/lSupply point
12Tritium (for radioactivity)(1) (5) (6)100Bq/lSupply point
13Turbidity1NTUTreatment works

Regulation 6

SCHEDULE 3MONITORING PROGRAMMES

1.—(1) A monitoring programme established under Part 4 of these Regulations must—

(a)verify that—

(i)the measures in place to control risks to human health throughout the water supply chain (from the catchment area through abstraction, treatment and storage to distribution) are working effectively; and

(ii)water at the point of compliance is wholesome;

(b)provide information on the quality of water supplied to—

(i)demonstrate whether or not the water complies with prescribed concentrations and values for parameters in Schedule 1;

(ii)determine the organoleptic and microbiological quality of the water; and

(iii)establish the effectiveness of the treatment of the water, particularly of disinfection where it is used.

(c)identify the most appropriate means of mitigating any risk to human health; and

(d)have regard to Part 5.

(2) A monitoring programme must consist of either—

(a)the collection and analysis of discrete water samples; or

(b)measurement recorded by a continuous monitoring process; or

(c)a combination of both of the methods described in sub-paragraphs (a) and (b).

(3) In addition, monitoring programmes may consist of—

(a)inspections of records of the functionality and maintenance status of equipment; and/or

(b)inspections of the catchment area, water abstraction, treatment, storage and distribution infrastructure.

(4) The monitoring programme may be based on a risk assessment as set out in regulation 30.

(5) When choosing appropriate parameters and other micro-organisms, parasites or substances for monitoring programmes, local conditions for each water supply system must be taken into consideration.

TABLE 1

PARAMETERS AND CIRCUMSTANCES FOR GROUP A MONITORING

(1) Item(2) Parameter(3) Circumstances
(1)

A supply which consists of both groundwater and surface water is deemed to be a supply which consists only of surface water.

1AluminiumIf used as water treatment chemicals or where the water originates from, or is influenced by, surface waters
2AmmoniumWhere chloramination is practised
3Coliform bacteriaIn all supplies
4Colony CountsIn all supplies
5ColourIn all supplies
6ConductivityIn all supplies
7Disinfectant residualWhen disinfection treatment is practised
8Escherichia coli (E. coli)In all supplies
9Indicative DoseWhere there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
10Iron(1)If used as water treatment chemicals or where the water originates from, or is influenced by, surface waters
11Manganese(1)Where the water originates from, or is influenced by, surface waters
12NitrateWhere chloramination is practised
13NitriteWhere chloramination is practised
14OdourIn all supplies
15pH (Hydrogen ion)In all supplies
16RadonWhere there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
17TasteIn all supplies
18TritiumWhere there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
19TurbidityIn all supplies

TABLE 2

Annual Sampling Frequencies: Water Supply Zones

This table sets out the annual sampling frequencies for all the substances and parameters in column 1. These are determined for each water supply zone according to its estimated population (column 2).

(1) Substances and parameters subject to monitoring(2) Estimated population of water supply zone(1)(3) Number of samples per year
(1)

Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000.

(2)

Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (5) and (6) below.

(3)

Group A monitoring in water supply zones is required only where chloramination is practised. In other circumstances Group B monitoring is required.

(4)

Group B monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, Group B monitoring is required at supply points.

(5)

To monitor for indicative dose (for radioactivity).

(6)

In the event that a single sample is taken in a year, a further sample should be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply.

Group A monitoring

Escherichia coli (E. coli)

< 100

≥ 100

4

12 per 5,000 population(1)

Coliform bacteria

Residual disinfectant

Aluminium

<100

100–4,999

5,000–9,999

10,000–29,999

30,000–49,999

50,000–79,999

80,000–100,000

2

4

12

24

36

52

76

Ammonium

Colony counts

Colour

Conductivity(2)

Hydrogen ion

Iron

Manganese

Nitrate(3)

Nitrite(3)

Odour

Taste

Turbidity
Group B monitoring
Aluminium

<100

100–4,999

5,000–100,000

1

4

8

Antimony
Arsenic
Benzene(2)
Benzo(a)pyrene
Boron(2)
Bromate(4)
Cadmium
Chromium
Clostridium perfringens (including spores)
Copper
Cyanide(2)
1,2 dichloroethane(2)
Enterococci
Fluoride(2)
Gross alpha(2) (5)
Gross beta(2) (5)
Iron
Lead
Manganese
Mercury(2)
Nickel
Nitrate(3)
Nitrite(3)

Pesticides and related

products(2)

Polycyclic aromatic hydrocarbons
Radon(2) (6)
Selenium
Sodium

Trichloroethene/

Tetrachloroethene(2)

Tetrachloromethane(2)
Trihalomethanes
Chloride(2)
Sulphate(2)
Total organic carbon(2)
Tritium(2)

TABLE 3

Annual Sampling Frequencies: Treatment Works or Supply Points

Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items (1) to (6) and at supply points for the other substances and parameters, except nitrite subject to notes 2 and 3 to the Table below.

This table sets out the annual sampling frequencies for all the substances and parameters in column 2 at treatment works or supply points. The frequencies are determined according to the volume of water supplied at each treatment works or supply point (column 3).

(1) Item(2) Substances and parameters(3) Volume of water supplied m3/d(1)(4) Number of samples per year(2)
(1)

The water undertaker may use the number of inhabitants in a supply zone instead of the volume of water to determine the minimum frequency, assuming a water consumption of 200 l/day/capita.

(2)

The volumes are calculated as averages taken over a calendar year.

(3)

Sampling at treatment works when chloramination is practised.

(4)

Sampling at treatment works when chloramination is not practised.

(5)

Group B monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, Group B monitoring is required in water supply zones

(6)

To monitor for indicative dose (for radioactivity).

1Escherichia coli (E. coli)

<20

20-1,999

2,000-5,999

6,000-11,999

≥ 12,000

4

52

104

208

365

2Coliform bacteria
3Colony counts
4Nitrite(3)
5Residual disinfectant
6Turbidity
Group A monitoring
7Conductivity

<20

20-999

1,000-1,999

2,000-5,999

6,000-9,999

10,000-15,999

16,000-32,999

33,000-49,999

50,000-67,999

68,000-84,999

85,000-101,999

102,000-119,999

120,000-241,999

242,000-484,999

485,000-728,999

2

4

12

24

36

52

104

156

208

260

312

365

730

1,460

2,190

Group A monitoring
8

Gross alpha(6)

<20

20-999

1,000-49,999

50,000-89,999

90,000-299,999

300,000-649,999

≥ 650,000

1

4

8

12

24

36

48

9

Gross beta(6)

10

Radon

11Tritium
Group B monitoring
12Benzene

<20

20-999

1,000-49,999

50,000-89,999

90,000-299,999

300,000-649,999

≥650,000

1

4

8

12

24

36

48

13Boron
14Bromate(5)
15Clostridium perfringens (including spores)
16Cyanide
171,2,dichloroethane
18Fluoride
19Mercury
20Nitrite(4)
21Pesticides and related products
22

Trichloroethene/

Tetrachloroethene

23Tetrachloromethane
24Chloride
25Sulphate
26Total Organic Carbon
27Radon
28Tritium
29Gross alpha(6)
30Gross beta(6)

Regulation 18

SCHEDULE 4ANALYTICAL METHODOLOGY

TABLE A

Parameters for which, subject to regulation 18(12), methods of analysis are prescribed

(1) Parameter(2) Method
Clostridium perfringens (including spores)EN ISO 14189
Coliform bacteriaEN ISO 9308-1 or EN ISO 9308-2
Colony count 22°C-enumeration of culturable microorganismsENISO 6222
Colony count 36°C-enumeration of culturable microoganismsEN ISO 6222
EnterococciEN ISO 7899-2
Escherichia coli (E. coli)EN ISO 9308-1 or EN ISO 9308-2
Pseudomonas aeruginosaEN ISO 16266

TABLE B

Minimum performance characteristic: “uncertainty of measurement”

(1) Parameter(1)(2) Uncertainty of measurement (% of parametric value, except pH)(2)
(1)

Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.

(2)

Uncertainty of measurement is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurand, based on the information used. The performance criterion for measurement uncertainty (k = 2) is the percentage of the parametric value stated in the table or better. Measurement uncertainty must be estimated at the level of the parametric value, unless otherwise specified.

(3)

If the value of uncertainty of measurement cannot be met, the best available technique should be selected (up to 60%).

(4)

The method determines total cyanide in all forms.

(5)

Values for trueness, precision and uncertainty of measurement are expressed in pH units.

(6)

Reference method EN ISO 8467.

(7)

The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30 % can be achieved for several pesticides, higher values up to 80 % may be allowed for a number of pesticides

(8)

The performance characteristics apply to individual substances, specified at 25% of the parametric value in Table B in Schedule 1.

(9)

The performance characteristics apply to individual substances, specified at 50% of the parametric value in Table B in Schedule 1.

(10)

The uncertainty of measurement should be estimated at the level of 3 mg/l of the total organic carbon. CEN 1484 Guidelines for the determination of total organic carbon and dissolved organic carbon must be used.

(11)

The uncertainty of measurement must be estimated at the level of 1.0 NTU (nephelometric turbidity units) in accordance with EN ISO 7027.

Aluminium25
Ammonium40
Antimony40
Arsenic30
Benzo(a)pyrene(3)50
Benzene40
Boron25
Bromate40
Cadmium25
Chloride15
Chromium30
Conductivity20
Copper25
Cyanide(4)30
1,2-dichloroethane40
Fluoride20
Hydrogen ion concentration pH (expressed in pH units)(5)0.2
Iron30
Lead25
Manganese30
Mercury30
Nickel25
Nitrate15
Nitrite20
Oxidisability(6)50
Pesticides(7)30
Polycyclic aromatic hydrocarbons(8)50
Selenium40
Sodium15
Sulphate15
Tetrachloroethene(9)30
Tetrachloromethane30
Trichloroethene(9)40
Trihalomethanes: total(8)40
Total organic carbon(10)30
Turbidity(11)30

TABLE C

Minimum performance characteristics: trueness, precision and limit of detection- may be used until 31 December 2019

(1) Parameter(1)(2) Trueness(2)(3) Precision(3)(4) Limit of detection(4)
(1)

Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.

(2)

Trueness is a measure of systematic error, i.e. the difference between the mean value of the large number of repeated measurements and the true value. Further specifications are those set out in ISO 5725.

(3)

Precision is a measure of random error and is usually expressed as the standard deviation (within and between batches) of the spread of results from the mean. Acceptable precision is twice the relative standard deviation. This term is further specified in ISO 5725.

(4)

Limit of detection is either three times the standard deviation within a batch of a natural sample containing a low concentration of the parameter; or five times the standard deviation of a blank sample (within a batch).

(5)

The method determines total cyanide in all forms.

(6)

Values for trueness, precision and uncertainty of measurement are expressed in pH units.

(7)

Reference method EN ISO 8467 1995.

(8)

The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30% can be achieved for several pesticides, higher values up to 80% may be allowed for a number of pesticides

(9)

The performance characteristics apply to individual substances, specified at 25% of the parametric value in Table B in Schedule 1.

(10)

The performance characteristics apply to individual substances, specified at 50% of the parametric value in Table B in Schedule 1.

(11)

The performance characteristics apply to prescribed value 4 NTU.

(12)

The performance characteristics apply to prescribed value 1 NTU for water leaving surface water treatment works.

Aluminium101010
Ammonium101010
Antimony252525
Arsenic101010
Benzene252525
Benzo(a)pyrene252525
Boron101010
Bromate252525
Cadmium101010
Chloride101010
Chromium101010
Colour101010
Conductivity101010
Copper101010
Cyanide(5)101010
1,2-dichloroethane252510
Fluoride101010
Hydrogen ion concentration pH (expressed in pH units)(6)0.20.2
Iron101010
Lead101010
Manganese101010
Mercury201020
Nickel101010
Nitrate101010
Nitrite101010
Oxidisability(7)252525
Pesticides(8)252525
Polycyclic aromatic hydrocarbons(9)252525
Selenium101010
Sodium101010
Sulphate101010
Tetrachloroethene(10)252510
Tetrachloromethane202020
Trichloroethene(10)252510
Trihalomethanes: total(9)252510
Turbidity(11)101010
Turbidity(12)252525

Regulation 8

SCHEDULE 5MONITORING FOR INDIVIDUAL RADIONUCLIDES

1.  A water undertaker may use a screening strategy for gross alpha and gross beta to monitor for the parametric indicator value for indicative dose(1). The recommended screening value for gross alpha is 0.1Bq/l and for gross beta is 1.0Bq/l.

If the gross alpha activity exceeds 0.1Bq/l or the gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required.

The radionuclides to be measured must be based on all relevant information about likely sources of radioactivity.

2.  Calculation of the ID

The ID must be calculated from the measured radionuclide concentrations and the dose coefficients laid down in Annex III, Table A of Directive 96/29/Euratom or more recent information recognised by the Department, on the basis of the annual intake of water (730l for adults). Where the following formula is satisfied, it can be assumed that the ID is less than the parametric value if 0.1mSv and no further investigation is required.

where

Ci(obs) = observed concentration of radionuclide i

Ci(der) = derived concentration of radionuclide i (see Table 1)

n – number of radionuclides detected.

TABLE 1

Derived concentration for radioactivity in water intended for human consumption(1)
OriginRadionuclideDerived concentration(2)
(1)

This table includes value for the most common natural and artificial radionuclides; these are precise values, calculated for a dose of 0.1mSV, an annual intake of 730 litres and using the dose coefficients laid down in Annex III of Directive 96/29/Euratom; derived concentration for other radionuclides can be calculated on the same basis, and values can be updated on the basis of more recent information recognised by the competent authorities.

(2)

Where appropriate gross beta activity may be replaced by residual beta activity after subtraction of the K-40 concentration.

(3)

This table allows only for the radiological properties of uranium, not for its chemical toxicity.

NaturalU-238(3)3.0 Bq/l
U-234(3)2.8 Bq/l
Ra-2260.5 Bq/l
Ra-2280.2 Bq/l
Pb-2100.2 Bq/l
Po-2100.1 Bq/l
ArtificialC-14240 Bq/l
Sr-904.9 Bq/l
Pu-239/Pu-2400.6 Bq/l
Am-2410.7 Bq/l
Co-6040 Bq/l
Cs-1347.2 Bq/l
Cs-13711 Bq/l
I-1316.2 Bq/l

3.  Performance characteristics and method of analysis.

For the following parameters and radionuclides, the method of analysis used must, as a minimum be capable of measuring activity concentrations with a limit of detection specified in Table 2 below:

TABLE 2

Parameters and radionuclidesLimit of detection(1) (2)
(1)

The limit of detection must be calculated according to the ISO standard 11929: Determination of the characteristic limits (decision threshold, detection limit, and limits of confidence interval) for measurements of ionising radiation– Fundamentals and application, with probabilities of error of 1st and 2nd kind of 0.05 each.

(2)

Measurement uncertainties must be calculated and reported as complete standard uncertainties or as expanded uncertainties with an expansion factor of 1.96 according the ISO Guide for the Expression of Uncertainty in Measurement.

(3)

The limit of detection for tritium and for radon is 10% of its parametric value of 100 Bq/l.

(4)

The limit of detection for gross alpha activity and gross beta activities are 40% of the screening values of 0.1 and 1.0 Bq/l respectively.

(5)

This limit of detection applies only to initial screening for ID for a new water source, if initial checking indicates that is not plausible that Ra-228 exceeds 20% of the derived concentration, the limit of detection may be increased to 0.8 Bq/l for routine Ra-228 nuclide specific measurements until a subsequent re-check is required.

Tritium(3)10 Bq/l
Radon(3)10 Bq/l
gross alpha activity(4)0.04 Bq/l
gross beta activity(4)0.4 Bq/l
U-2380.02 Bq/l
U-2340.02 Bq/l
Ra-2260.04 Bq/l
Ra-228(5)0.02 Bq/l
Pb-2100.02 Bq/l
Po-2100.01 Bq/l
C-1420 Bq/l
Sr-900.4 Bq/l
Pu-239/Pu-2400.04 Bq/l
Am-2410.06 Bq/l
Co-600.5 Bq/l
Cs-1340.5 Bq/l
Cs-1370.5 Bq/l
I-1310.5 Bq/l

Regulation 39

SCHEDULE 6REVOCATIONS

Revocations coming into operation on the 27th October 2017

No.Regulations revokedExtent of revocation
1.

The Water Supply (Water Quality) Regulations (Northern Ireland) 2007

The whole Regulations

2.

The Water Supply (Water Quality) (Amendment) Regulations (NI) 2009The whole Regulations
3.The Water Supply (Water Quality) (Amendment) Regulations (NI) 2010The whole Regulations
4.The Water Supply (Water Quality) (Amendment) Regulations (NI) 2015The whole Regulations
(1)

Where appropriate gross beta activity may be replaced by residual beta activity after subtraction of the K-40 activity concentration.

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