- Y Diweddaraf sydd Ar Gael (Diwygiedig)
- Pwynt Penodol mewn Amser (28/11/2015)
- Gwreiddiol (a wnaed Fel)
Version Superseded: 27/10/2017
Point in time view as at 28/11/2015.
There are currently no known outstanding effects for the The Public Water Supplies (Scotland) Regulations 2014.
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Regulation 2(1) and (4)
1 The parametric values in Part 2 are not required to protect human health (since the parametric values in Part 1 are sufficient for that purpose). The values in Part 2 are not therefore set for the purposes of Article 5(3) of the Directive. | ||||
2 Compliance required as to 95% of samples from each service reservoir (regulation 4(4)). | ||||
(1)Item | (2)Parameter | (3)Concentration orvalue (maximum) | (4)Units ofmeasurement | (5)Point ofcompliance |
---|---|---|---|---|
Part 1 | ||||
1. | Enterococci | 0 | Number/100ml | Consumer's tap |
2. | Escherichia coli | 0 | Number/100ml | Consumer's tap |
Part 21 | ||||
3. | Coliform bacteria | 0 | Number/100ml | Service reservoir2 |
0 | Number/100ml | Treatment works | ||
4. | Escherichia coli | 0 | Number/100ml | Service reservoir |
0 | Number/100ml | Treatment works | ||
Notes— |
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 See also regulation 6(6). | ||||
3 See also regulation 4(2)(c). | ||||
4 The corresponding parametric value applies to each ‘other pesticide’ individually. | ||||
5 The parametric values in this Part are not required to protect human health (since the parametric values in Part 1 are sufficient for that purpose). The values in Part 2 are not therefore set for the purposes of Article 5(3) of the Directive. | ||||
(1)Item | (2)Parameter | (3)Concentration orvalue (maximum) | (4)Units ofmeasurement | (5)Point ofcompliance |
---|---|---|---|---|
Part 1 | ||||
1. | Acrylamide1 | 0.10 | μg/l | Consumer's tap |
2. | Antimony | 5.0 | μgSb/l | Consumer's tap |
3. | Arsenic | 10 | μgAs/l | Consumer's tap |
4. | Benzene | 1.0 | μg/l | Consumer's tap |
5. | Benzo(a)pyrene | 0.010 | μg/l | Consumer's tap |
6. | Boron | 1.0 | mgB/l | Consumer's tap |
7. | Bromate | 10 | μgBrO3/l | Consumer's tap |
8. | Cadmium | 5.0 | μgCd/l | Consumer's tap |
9. | Chromium | 50 | μgCr/l | Consumer's tap |
10. | Copper2 | 2.0 | mgCu/l | Consumer's tap |
11. | Cyanide | 50 | μgCN/l | Consumer's tap |
12. | 1,2-dichloroethane | 3.0 | μg/l | Consumer's tap |
13. | Epichlorohydrin1 | 0.10 | μg/l | Consumer's tap |
14. | Fluoride | 1.5 | mgF/l | Consumer's tap |
15. | Lead2 | 10 | μgPb/l | Consumer's tap |
16. | Mercury | 1.0 | μgHg/l | Consumer's tap |
17. | Nickel2 | 20 | μgNi/l | Consumer's tap |
18. | Nitrate3 | 50 | mgNO3/l | Consumer's tap |
19. | Nitrite3 | 0.50 | mgNO2/l | Consumer's tap |
0.10 | mgNO2/l | Treatment works | ||
20. | Pesticide— | |||
Aldrin | 0.030 | μg/l | Consumer's tap | |
Dieldrin | 0.030 | μg/l | Consumer's tap | |
Heptachlor | 0.030 | μg/l | Consumer's tap | |
Heptachlor epoxide | 0.030 | μg/l | Consumer's tap | |
Other pesticide4 | 0.10 | μg/l | Consumer's tap | |
21. | Pesticides: Total | 0.50 | μg/l | Consumer's tap |
22. | PAH: Total | 0.10 | μg/l | Consumer's tap |
23. | Selenium | 10 | μgSe/l | Consumer's tap |
24. | Tetrachloroethene and Trichloroethene | 10 | μg/l | Consumer's tap |
25. | THM: Total | 100 | μg/l | Consumer's tap |
26. | Vinyl chloride1 | 0.50 | μg/l | Consumer's tap |
Part 25 | ||||
27. | Aluminium | 200 | μgAl/l | Consumer's tap |
28. | Colour | 20 | mg/l Pt/Co | Consumer's tap |
29. | Iron | 200 | μgFe/l | Consumer's tap |
30. | Manganese | 50 | μgMn/l | Consumer's tap |
31. | Sodium | 200 | mgNa/l | Consumer's tap |
32. | Tetrachloromethane | 3 | μg/l | Consumer's tap |
33. | Turbidity | 4 | NTU | Consumer's tap |
Notes— |
1 The water should not be aggressive. | ||||
2 In the event that the use of samples from a point within a water supply zone has not been authorised for this parameter under regulation 8, the point of monitoring is instead the consumer's tap. | ||||
3 This value, in so far as the point of monitoring is a service reservoir, is not set for the purposes of Article 5(3) of the Directive. | ||||
4 This value, in so far as the point of monitoring is a treatment works, is not set for the purposes of Article 5(3) of the Directive. | ||||
[F15 Remedial action is to be deemed justified on radiological protection grounds, without further consideration, where radon concentrations exceed 1,000 Bq/l.] | ||||
[F16 If the concentration of tritium exceeds this value, an analysis of the presence of other artificial radionuclides must be also carried out by Scottish Water.] | ||||
(1)Item | (2)Parameter | (3)Concentration orvalue (maximum)or state | (4)Units ofmeasurement | (5)Point ofmonitoring |
---|---|---|---|---|
Part 1 | ||||
1. | Ammonium | 0.50 | mgNH4/l | Consumer's tap |
2. | Chloride1 | 250 | mgCl/l | Supply point2 |
3. | Clostridium perfringens (including spores) | 0 | Number/100ml | Supply point2 |
4. | Coliform bacteria | 0 | Number/100ml | Consumer's tap |
5. | Colony count | No abnormal change | Number/1ml at 22°C and at 37°C | Consumer's tap |
Service reservoir3 | ||||
Treatment works4 | ||||
6. | Colour | Acceptable to consumers and no abnormal change | Consumer's tap | |
7. | Conductivity1 | 2500 | μS/cm at 20°C | Supply point2 |
8. | Hydrogen ion | 9.5 | pH value | Consumer's tap |
6.5 (minimum) | ||||
9. | Odour | Acceptable to consumers and no abnormal change | Consumer's tap | |
10. | Sulphate1 | 250 | mgSO4/l | Supply point2 |
11. | Taste | Acceptable to consumers and no abnormal change | Consumer's tap | |
12. | Total organic carbon | No abnormal change | mgC/l | Supply point2 |
13. | Turbidity | 1 | NTU | Treatment works |
Part 2 | ||||
14. | Indicative dose | 0.10 | mSvF2... | Supply point2 |
[F3 14A. | Radon5 | 100 | Bq/l | Supply point(b)] |
15. | Tritium [F4(f)] | 100 | Bq/l | Supply point2 |
Notes— |
Textual Amendments
F1Words in sch. 1 inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 16(b)
F2Word in sch. 1 omitted (28.11.2015) by virtue of The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 16(a)(i)
F3Sch. 1 entry inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 16(a)(ii)
F4Word in sch. 1 inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 16(a)(iii)
In this Schedule—
F5...
“NTU” means Nephelometric Turbidity Unit;
“PAH: Total” means the sum of the concentrations of the following polyaromatic hydrocarbons: benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene and indeno(1,2,3-cd)pyrene;
“Pesticide” means an organic insecticide, herbicide, fungicide, nematocide, acaricide, algicide, rodenticide, slimicide, molluscicide or related product (including a growth regulator), and includes the relevant metabolites, degradation and reaction products of that pesticide;
“Pesticides: Total” refers to the sum of the concentrations of each pesticide detected and quantified in the monitoring procedure;
“Tetrachloroethene and Trichloroethene” means the sum of the concentrations of tetrachloroethene and trichloroethene; and
“THM: Total” means the sum of the concentrations of the following trihalomethanes: chloroform, bromoform, dibromochloromethane and bromodichloromethane.
Textual Amendments
F5Words in sch. 1 omitted (28.11.2015) by virtue of The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 16(c)
Regulations 2(1), 2(4), 9 and 11
(1)Item | (2)Parameter | (3)Circumstances |
---|---|---|
1. | Aluminium | When used as flocculant or where the water originates from, or is influenced by, surface waters. |
2. | Ammonium | |
3. | Clostridium perfringens (including spores) | Where the water originates from, or is influenced by, surface waters. |
4. | Coliform bacteria | |
5. | Colony count | |
6. | Colour | |
7. | Conductivity | |
8. | Escherichia coli | |
9. | Hydrogen ion | |
10. | Iron | When used as flocculant or where the water originates from, or is influenced by, surface waters. |
11. | Manganese | Where the water originates from, or is influenced by, surface waters. |
12. | Nitrate | When chloramination is practised. |
13. | Nitrite | When chloramination is practised. |
14. | Odour | |
15. | Taste | |
16. | Turbidity |
1 Sampling at the frequencies specified in this table for check monitoring is required only when the circumstances for this parameter in column (3) of Table 1 apply (see regulation 6(4)(b)). Where this is not the case, sampling at the frequencies specified in this table for audit monitoring is required instead. | ||||
2 Subject to note (e), samples for this parameter may, to the extent authorised under regulation 8 for a water supply zone, be taken from alternative supply points in accordance with regulation 9(1)(b). | ||||
3 Only those pesticides which are likely to be present in a given supply need to be monitored. | ||||
4 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. | ||||
5 If sodium hypochlorite is added after water has left a treatment works in the water supply zone, monitoring for this parameter must be carried out at sampling points (rather than at supply points). | ||||
(1)Item | (2)Parameter | (3)Estimated population ofwater supply zone | (4)Reduced | (5)Standard |
---|---|---|---|---|
Subject to check monitoring | ||||
1. | Coliform bacteria | < 100 | – | 4 |
2. | Escherichia coli | ≥100 | – | 12 per 5,000 |
3. | Residual disinfectant | population4 | ||
4. | Aluminium1 | < 100 | 1 | 2 |
5. | Ammonium | 100-4,999 | 2 | 4 |
6. | Clostridium perfringens (including spores)12 | 5,000-9,999 | 6 | 12 |
10,000-29,999 | 12 | 24 | ||
7. | Colony count | 30,000-49,999 | 18 | 36 |
8. | Colour | 50,000-79,999 | 26 | 52 |
9. | Conductivity2 | 80,000-100,000 | 38 | 76 |
10. | Hydrogen ion | |||
11. | Iron1 | |||
12. | Manganese1 | |||
13. | Nitrate1 | |||
14. | Nitrite1 | |||
15. | Odour | |||
16. | Taste | |||
17. | Turbidity | |||
Subject to audit monitoring | ||||
18. | Antimony | < 100 | – | 1 |
19. | Arsenic | 100-4,999 | – | 4 |
20. | Benzene2 | 5,000-100,000 | – | 8 |
21. | Benzo(a)pyrene | |||
22. | Boron2 | |||
23. | Bromate25 | |||
24. | Cadmium | |||
25. | Chloride2 | |||
26. | Chromium | |||
27. | Copper | |||
28. | Cyanide2 | |||
29. | 1,2-dichloroethane2 | |||
30. | Enterococci | |||
31. | Fluoride2 | |||
32. | Lead | |||
33. | Mercury2 | |||
34. | Nickel | |||
35. | Pesticide23 | |||
36. | PAH: Total | |||
37. | Selenium | |||
38. | Sodium | |||
39. | Sulphate2 | |||
40. | Tetrachloroethene and Trichloroethene2 | |||
41. | Tetrachloromethane2 | |||
42. | THM: Total | |||
43. | Total organic carbon2 | |||
[F644. | Indicative dose2 | |||
44A. | Radon2] | |||
45. | Tritium2 | |||
Notes— |
Textual Amendments
F6Sch. 2 entry substitued (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 17(a)
Marginal Citations
M1This table specifies the number of samples to be taken at sampling points for the purposes of regulation 9(1)(a) and (2).
1 Sampling at the frequencies specified in this table for check monitoring is required only where the water originates from, or is influenced by, surface waters (see Table 1). Where this is not the case, sampling at the frequencies specified in this table for audit monitoring is required instead. | ||||
2 If sodium hypochlorite is added after water has left a treatment works in the water supply zone, audit monitoring for this parameter must be carried out at sampling points (rather than at supply points). | ||||
3 Only those pesticides which are likely to be present in a given supply need to be monitored. | ||||
(1)Item | (2)Parameter | (3)Volume of watersupplied m3/d | (4)Reduced | (5)Standard |
---|---|---|---|---|
Subject to check monitoring | ||||
1. | Clostridium perfringens (including spores)1 | < 20 | – | 2 |
20-999 | 2 | 4 | ||
2. | Conductivity | 1,000-1,999 | 6 | 12 |
2,000-5,999 | 12 | 24 | ||
6,000-9,999 | 18 | 36 | ||
10,000-15,999 | 26 | 52 | ||
16,000-32,999 | 52 | 104 | ||
33,000-49,999 | 78 | 156 | ||
50,000-67,999 | 104 | 208 | ||
68,000-84,999 | 130 | 260 | ||
85,000-101,999 | 156 | 312 | ||
102,000-119,999 | 183 | 365 | ||
120,000-241,999 | 365 | 730 | ||
242,000-484,999 | 730 | 1,460 | ||
485,000-728,999 | 1,095 | 2,190 | ||
Subject to audit monitoring | ||||
3. | Benzene | < 20 | – | 1 |
4. | Boron | 20-999 | – | 4 |
5. | Bromate2 | 1,000-49,999 | – | 8 |
6. | Chloride | 50,00-89,999 | – | 12 |
7. | Cyanide | 90,000-299,999 | – | 24 |
8. | 1,2-dichloroethane | 300,000-649,999 | – | 36 |
9. | Fluoride | ≥ 650,000 | – | 48 |
10. | Mercury | |||
11. | Pesticide3 | |||
12. | Sulphate | |||
13. | Tetrachloroethene and Trichloroethene | |||
14. | Tetrachloromethane | |||
15. | Total organic carbon | |||
[F716. | Indicative dose | |||
16A. | Radon] | |||
17. | Tritium | |||
Notes— |
Textual Amendments
F7Sch. 2 entry substitued (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 17(b)
Marginal Citations
M2This table specifies the number of samples to be taken at supply points for the purposes of regulation 9(1)(b) and (2).
1 Sampling at the frequencies specified in this table for check monitoring is required only when chloramination is practised. When this is not the case, this parameter must be sampled instead at the frequencies specified in this table for audit monitoring. | ||||
(1)Item | (2)Parameter | (3)Volume of watersupplied m3/d | (4)Reduced | (5)Standard |
---|---|---|---|---|
Subject to check monitoring | ||||
1. | Coliform bacteria | < 20 | – | 4 |
2. | Colony count | 20-1,999 | 12 | 52 |
3. | Escherichia coli | 2,000-5,999 | 52 | 104 |
4. | Residual disinfectant | 6,000-11,999 ≥12,000 | 104 208 | 208 365 |
5. | Nitrite1 | < 20 | – | 2 |
6. | Turbidity | 20-999 | 2 | 4 |
1,000-1,999 | 6 | 12 | ||
2,000-5,999 | 12 | 24 | ||
6,000-9,999 | 18 | 36 | ||
10,000-15,999 | 26 | 52 | ||
16,000-32,999 | 52 | 104 | ||
33,000-49,999 | 78 | 156 | ||
50,000-67,999 | 104 | 208 | ||
68,000-84,999 | 130 | 260 | ||
85,000-101,999 | 156 | 312 | ||
102,000-119,999 | 183 | 365 | ||
120,000-241,999 | 365 | 730 | ||
242,000-484,999 | 730 | 1,460 | ||
485,000-728,999 | 1,095 | 2,190 | ||
Subject to audit monitoring | ||||
7. | Nitrite1 | < 20 | – | 1 |
20-999 | – | 4 | ||
1,000-49,999 | – | 8 | ||
50,000-89,999 | – | 12 | ||
90,000-299,999 | – | 24 | ||
300,000-649,999 | – | 36 | ||
≥650,000 | – | 48 | ||
Notes— |
Marginal Citations
M3This table specifies the number of samples to be taken at treatment works for the purposes of regulation 11.
In this Schedule F8... “Pesticide”, “PAH: Total”, “Tetrachloroethene and Trichloroethene” and “THM: Total” have the same meanings as they have in Schedule 1.
Textual Amendments
F8Words in sch. 2 omitted (28.11.2015) by virtue of The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 17(c)
Regulation 6(6A)
Textual Amendments
F9Sch. 2A inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 18
1.—(1) Subject to sub-paragraphs (2) and (3), Scottish Water must monitor the water it supplies, or intends to supply, for human consumption purposes for—
(a)indicative dose (item 14) in Table C;
(b)radon (item 14A) in Table C; and
(c)tritium (item 15) in Table C.
(2) Where the Scottish Ministers, by notice to Scottish Water, confirm that they have established that indicative dose, radon or, as the case may be, tritium (“the parameter”) is not likely to be present, for a period specified in the notice, in a supply of water for human consumption purposes in concentrations which could exceed the prescribed concentration or value for that parameter, Scottish Water is not required to monitor the supply for the parameter during the period specified in the notice.
(3) In case of naturally occurring radionuclides—
(a)where previous results show that the concentration of radionuclides in the supply is stable, the minimum sampling and analysis frequencies are to be decided by the Scottish Ministers, and confirmed by notice to Scottish Water, taking into consideration the risk to human health; and
(b)where the Scottish Ministers, by notice to Scottish Water, confirm that they are satisfied (on the basis of representative surveys, monitoring data or other reliable information) that levels of radon, tritium and the calculated indicative dose in a supply of water for human consumption purposes will, for a period specified in the notice, remain below the prescribed concentration or value for each parameter, Scottish Water is not required to monitor the supply for these parameters during the period specified in the notice.
(4) Where sub-paragraph (3)(b) applies, the Scottish Ministers must communicate the grounds for the decision to the European Commission and provide the Commission with the necessary documentation supporting that decision, including the findings of any surveys, monitoring or investigations carried out.
2.—(1) Subject to paragraphs 5 and 6, Scottish Water must ensure that representative surveys are undertaken to determine the scale and nature of likely exposures to radon in water it supplies, or intends to supply, for human consumption purposes originating from different types of ground water sources and wells in different geological areas.
(2) The surveys must be designed in such a way that underlying factors, and especially the geology and hydrology of the area, radioactivity of rock or soil, and well type, can be identified and used to direct further action to areas of likely high exposure.
(3) Monitoring of radon concentrations must be carried out if Scottish Water has reason to believe, on the basis of the results of the representative surveys or other reliable information, that the prescribed concentration or value for radon might be exceeded.
3.—(1) Subject to paragraphs 5 and 6, Scottish Water must monitor the water it supplies, or intends to supply, for human consumption purposes for tritium where—
(a)an anthropogenic source of tritium or other artificial radionuclides is present within the catchment area for the supply; and
(b)it cannot be shown on the basis of other surveillance programmes or investigations that the level of tritium is below the prescribed concentration or value for tritium.
(2) Where monitoring for tritium is required by sub-paragraph (1), samples must be taken in accordance with regulation 9(1) and (4).
(3) If the concentration of tritium in any such sample exceeds the prescribed concentration or value for tritium, Scottish Water must carry out an investigation of the presence of other artificial radionuclides.
4.—(1) Subject to paragraphs 5 and 6, Scottish Water must monitor the water it supplies, or intends to supply, for human consumption purposes for indicative dose where—
(a)a source of artificial radioactivity or elevated natural radioactivity is present; and
(b)it cannot be shown on the basis of other representative monitoring programmes or other investigations that the level of indicative dose is below the prescribed concentration or value for that parameter.
(2) Where sub-paragraph (1) requires monitoring (of radionuclide levels) only in relation to a source of artificial radioactivity, samples must be taken in accordance with regulation 9(1) and (4).
(3) Where sub-paragraph (1) requires monitoring (of radionuclide levels) in relation to a source of elevated natural radioactivity, the Scottish Ministers must specify, by notice to Scottish Water, the frequency of the monitoring required of—
(a)gross alpha activity;
(b)gross beta activity; or
(c)individual natural radionuclides,
for screening strategies pursuant to regulation 6(6A)(b) and Schedule 3A.
(4) Where sub-paragraph (3) applies, the frequency specified may vary from a single check measurement to the frequency which would otherwise apply under regulation 9(1) and (4).
(5) Where a single check for natural radioactivity is specified under sub-paragraph (3), Scottish Water must carry out a further check if any change occurs in relation to the supply which is likely to influence the concentrations of radionuclides in the supply.
5. Where Scottish Water supplies, or intends to supply, water for human consumption purposes which is treated to reduce the level of radionuclides, Scottish Water must monitor the supply for indicative dose, radon and tritium in accordance with regulation 9(1) and (4) to verify the continued efficacy of that treatment.
6. In circumstances where the prescribed concentration or value for indicative dose, radon or, as the case may be, tritium is exceeded in a sample taken in relation to a supply, or intended supply, of water by Scottish Water for human consumption purposes, the Scottish Ministers must specify, by notice to Scottish Water, the extent of resampling necessary to ensure that the measured values are representative of an average activity concentration for a full year.]
Regulations 2(1), 2(4) and 15(5)
1 The composition of m-CP agar is: | ||
Basal medium— | ||
Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for 15 minutes. | ||
(1)Item | (2)Parameter | (3)Method |
---|---|---|
1. | Clostridium perfringens (including spores) | Membrane filtration followed by anaerobic incubation of the membrane on m-CP agar1 at 44 ± 1°C for 21 ± 3 hours. Count opaque yellow colonies that turn pink or red after exposure to ammonium hydroxide vapours for 20 to 30 seconds. |
2. | Coliform bacteria | ISO 9308-1 |
3. | Colony count 22°C — enumeration of culturable microorganisms | prEN ISO 6222 |
4. | Colony count 37°C — enumeration of culturable microorganisms | prEN 6222 |
5. | Enterococci | ISO 7899-2 |
6. | Escherichia coli | ISO 9308-1 |
Notes— |
1 The method of analysis should determine total cyanide in all forms. | ||||
2 The capabilities required apply in relation to each individual pesticide. | ||||
3 The capabilities required apply in relation to each individual substance comprising PAH: Total at 25% of the prescribed concentration or value for PAH: Total. | ||||
4 The capabilities required apply at 50% of the prescribed concentration or value for PAH: Total. | ||||
5 The capabilities required apply in relation to prescribed concentration or value in Table B. | ||||
6 The capabilities required apply in relation to prescribed concentration or value in Table C. | ||||
In this Schedule “Pesticide”, “PAH: Total” and “THM: Total” have the meanings given in Schedule 1. | ||||
(1) Item | (2) Parameter | (3) Trueness % of prescribed concentration or value | (4) Precision % of prescribed concentration or value | (5) Limit of detection % of prescribed concentration or value |
---|---|---|---|---|
1. | Aluminium | 10 | 10 | 10 |
2. | Ammonium | 10 | 10 | 10 |
3. | Antimony | 25 | 25 | 25 |
4. | Arsenic | 10 | 10 | 10 |
5. | Benzene | 25 | 25 | 25 |
6. | Benzo(a)pyrene | 25 | 25 | 25 |
7. | Boron | 10 | 10 | 10 |
8. | Bromate | 25 | 25 | 25 |
9. | Cadmium | 10 | 10 | 10 |
10. | Chloride | 10 | 10 | 10 |
11. | Chromium | 10 | 10 | 10 |
12. | Colour | 10 | 10 | 10 |
13. | Conductivity | 10 | 10 | 10 |
14. | Copper | 10 | 10 | 10 |
15. | Cyanide1 | 10 | 10 | 10 |
16. | 1,2-dichloroethane | 25 | 25 | 10 |
17. | Fluoride | 10 | 10 | 10 |
18. | Iron | 10 | 10 | 10 |
19. | Lead | 10 | 10 | 10 |
20. | Manganese | 10 | 10 | 10 |
21. | Mercury | 20 | 10 | 20 |
22. | Nickel | 10 | 10 | 10 |
23. | Nitrate | 10 | 10 | 10 |
24. | Nitrite | 10 | 10 | 10 |
25. | Pesticide2 | 25 | 25 | 25 |
26. | PAH: Total3 | 25 | 25 | 25 |
27. | Selenium | 10 | 10 | 10 |
28. | Sodium | 10 | 10 | 10 |
29. | Sulphate | 10 | 10 | 10 |
30. | Tetrachloroethene4 | 25 | 25 | 10 |
31. | Tetrachloromethane | 20 | 20 | 20 |
32. | Trichloroethene4 | 25 | 25 | 10 |
33. | THM: Total3 | 25 | 25 | 10 |
34. | Turbidity5 | 10 | 10 | 10 |
35. | Turbidity6 | 25 | 25 | 25 |
Notes— |
Regulation 6(6A)
Textual Amendments
F10Sch. 3A inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 19
1.—(1) Scottish Water may use reliable screening strategies to indicate the presence of radioactivity in water it supplies, or intends to supply, for human consumption purposes.
(2) These strategies may include screening for—
(a)certain radionuclides or an individual radionuclide; or
(b)gross alpha activity or gross beta activity.
2.—(1) Where screening is carried out for certain radionuclides or for an individual radionuclide, Scottish Water must carry out an analysis of additional radionuclides if, in relation to any supply referred to in paragraph 1—
(a)one of the activity concentrations of a radionuclide listed in column 2 of the table below exceeds 20% of the corresponding derived concentration in column 3; or
(b)the tritium concentration exceeds the prescribed concentration or value for tritium.
(2) Scottish Water must, in deciding which radionuclides require to be measured for each supply, take into account all relevant information about likely sources of radioactivity.
1 This table includes values for the most common natural and artificial radionuclides. These are precise values, calculated for a dose of 0.1 mSv, an annual intake of 730 litres and using the dose coefficients laid down in Table (A) of Annex III to Council Directive 96/29/Euratom laying down basic safety standards for the protection of the health of workers and the general public against the dangers arising from ionizing radiation M4. Derived concentrations for other radionuclides may be calculated on the same basis. | ||
2 This allows only for the radiological properties of uranium, not for its chemical toxicity. | ||
Derived concentrations for radioactivity in water intended for human consumption1 | ||
---|---|---|
Origin | Radionuclide | Derived concentration (Bq/1) |
Natural | U-2382 | 3.0 |
U-2342 | 2.8 | |
Ra-226 | 0.5 | |
Ra-228 | 0.2 | |
Pb-210 | 0.2 | |
Po-210 | 0.1 | |
Artificial | C-14 | 240 |
Sr-90 | 4.9 | |
Pu-239 / Pu-240 | 0.6 | |
Am-241 | 0.7 | |
Co-60 | 40 | |
Cs-134 | 7.2 | |
Cs-137 | 11 | |
I-131 | 6.2 | |
Notes— |
Marginal Citations
M4OJ L 159, 29.6.1996, p. 1., as amended by Corrigendum (OJ L 314, 4.12.1996, p. 20).
3.—(1) Scottish Water may use screening strategies for gross alpha activity and gross beta activity (or, where appropriate, residual beta activity after subtraction of the potassium-40 activity) to monitor a supply referred to in paragraph 1 for indicative dose.
(2) Subject to sub-paragraph (3), screening levels must be set at—
(a)0.1 Bq/l for gross alpha activity; and
(b)1.0 Bq/l for gross beta activity.
(3) Scottish Water may set alternative levels to those specified in sub-paragraph (2) if it can demonstrate that these will ensure that an indicative dose of 0.1 mSv is not exceeded.
(4) If the gross alpha activity is less than 0.1 Bq/l and the gross beta activity is less than 1.0 Bq/l, Scottish Water may assume that the indicative dose is less than 0.1 mSv.
(5) Where sub-paragraph (4) applies, Scottish Water is not required to carry out a radiological investigation unless it is aware—
(a)that specific radionuclides are present in the water; and
(b)that these are liable to cause an indicate dose in excess of 0.1 mSv.
(6) If the gross alpha activity exceeds 0.1 Bq/l or the gross beta activity exceeds 1.0 Bq/l, Scottish Water must carry out an analysis for specific radionuclides.
(7) Scottish Water must, in deciding which radionuclides require to be measured for the purposes of sub-paragraph (6), take into account all relevant information about likely sources of radioactivity.
(8) If elevated levels of tritium are detected in a sample, Scottish Water must also measure the gross alpha activity and gross beta activity in that sample.
4.—(1) The indicative dose must be calculated from—
(a)the measured radionuclide concentrations and the dose coefficients laid down in Table (A) of Annex III to Council Directive 96/29/Euratom M5; or
(b)more recent information recognised by the Scottish Ministers,
on the basis of an annual intake of water of 730 litres for adults.
(2) Where the following formula is satisfied, Scottish Water may assume that the indicative dose is less than 0.1 mSv and that no further investigation is required—
where—
“Ci (obs)” refers to the observed concentration of radionuclide “i”;
“Ci (der)” refers to derived concentration of radionuclide “i”; and
“n” refers to the number of radionuclides detected.
Marginal Citations
M5Table (A) lays down ingestion dose coefficients for members of the public.
5. For each parameter or radionuclide listed in column 1 of the table below, the method of analysis used must be capable of measuring activity concentrations with at least the limit of detection specified for that parameter or radionuclide in column 2.
1 The limit of detection must be calculated according to the ISO standard 11929:2010 entitled “Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionising radiation - Fundamentals and application” (as it was first published), with probabilities of errors of 1st and 2nd kind of 0.05 each. | |
2 Measurement uncertainties must be calculated and reported as complete standard uncertainties, or as expanded standard uncertainties with an expansion factor of 1.96, according to the ISOIEC Guide 98-3:2008 entitled “Guide to the expression of uncertainty in measurement” (as it was first published). | |
3 The limit of detection for tritium and for radon is 10% of the corresponding prescribed concentration or value for the parameter. | |
4 The limit of detection for gross alpha activity and gross beta activities is 40% of the screening values of 0.1 Bq/l and 1.0 Bq/l respectively. | |
5 This limit of detection applies only to initial screening for indicative dose for a new water source. If initial checking indicates that it is unlikely that Ra-228 exceeds 20% of the derived concentration, the limit of detection may be increased to 0.08 Bq/l for routine Ra-228 nuclide specific measurements, until a subsequent re-check is required.] | |
Parameter / radionuclide | Limit of detection (in Bq/l)12 |
---|---|
Tritium | 103 |
Radon | 103 |
gross alpha activity | 0.044 |
gross beta activity | 0.44 |
U-238 | 0.02 |
U-234 | 0.02 |
Ra-226 | 0.04 |
Ra-228 | 0.025 |
Pb-210 | 0.02 |
Po-210 | 0.01 |
C-14 | 20 |
Sr-90 | 0.4 |
Pu-239 / Pu-240 | 0.04 |
Am-241 | 0.06 |
Co-60 | 0.5 |
Cs-134 | 0.5 |
Cs-137 | 0.5 |
I-131 | 0.5 |
Notes— |
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