SCHEDULE 1PRESCRIBED CONCENTRATIONS AND VALUES
Table A Microbiological parameters
(1)Item | (2)Parameters | (3)Concentration or Value (maximum) | (4)Units of Measurement |
|---|---|---|---|
1. | Enterococci | 0 | number/100ml |
2. | Escherichia coli (E. coli) | 0 | number/100ml |
(1)Item | (2)Parameters | (3)Concentration or Value (maximum) | (4)Units of Measurement |
|---|---|---|---|
1. | Coliform bacteria | 0 | number/100ml |
Table B Chemical parameters
(1)Item | (2)Parameters | (3)Concentration or Value (maximum) | (4)Units of Measurement |
|---|---|---|---|
1. | Acrylamide(i) | 0.10 | µg/1 |
2. | Antimony | 5.0 | µgSb/l |
3. | Arsenic | 10 | µgAs/l |
4. | Benzene | 1.0 | µg/l |
5. | Benzo(a)pyrene | 0.010 | µg/l |
6. | Boron | 1.0 | mgB/l |
7. | Bromate | 10 | µgBrO3/l |
8. | Cadmium | 5.0 | µgCd/l |
9. | Chromium | 50 | µgCr/l |
10. | Copper | 2.0 | mg Cu/l |
11. | Cyanide | 50 | µgCN/l |
12. | 1,2 dichloroethane | 3.0 | µg/l |
13. | Epichlorohydrin(i) | 0.10 | µg/l |
14. | Fluoride | 1.5 | mg F/l |
15. | Lead |
| µgPb/l |
|
|
| µgPb/l |
16. | Mercury | 1.0 | µgHg/l |
17. | Nickel | 20 | µgNi/l |
18. | Nitrate | 50 | mgNO3/l |
19. | Nitrite | 0.50 | mgNO2/l |
20. | Pesticides(ii)– |
|
|
| Aldrin | 0.030 | µg/l |
| Dieldrin | 0.030 | µg/l |
| Heptachlor | 0.030 | µg/l |
| Heptachlor epoxide | 0.030 | µg/l |
| other pesticides | 0.10 | µg/l |
21. | Pesticides: Total(iii) | 0.50 | µg/l |
22. | PAH(iv) | 0.10 | µg/l |
23. | Selenium | 10 | µgSe/l |
24. | Tetrachloroethene & Trichloroethene(v) | 10 | µg/l |
25. | THM: Total(vi) | 100 | µg/l |
26. | Vinyl chloride(i) | 0.50 | µg/l |
Notes:
i
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.
ii
See the definition of “pesticides and related products” in regulation 2(1). The parametric value applies to each individual pesticide.
iii
“Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.
iv
“PAH” means Polycyclic Aromatic Hydrocarbons, the specified compounds being:
– benzo(b)fluoranthene
– benzo(k)fluoranthene
– benzo(ghi)perylene
– indeno(1,2,3–cd)pyrene.
The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
v
The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
vi
“THM: Total” means total Trihalomethanes, the specified compounds being:
– chloroform
– bromoform
– dibromochloromethane
– bromodichloromethane.
The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
(1)Item | (2)Parameters | (3)Concentration or Value (maximum unless otherwise stated)) | (4)Units of Measurement |
|---|---|---|---|
1. | Aluminium | 200 | µgA1/1 |
2. | Colour | 20 | mg/l Pt/Co |
3. | F1. . . | F1. . . | F1. . . |
4. | Iron | 200 | µgFe/l |
5. | Manganese | 50 | µgMn/l |
6. | F2. . . | F2. . . | F2. . . |
7. | Silver(i) | 10 | µg Ag/l |
8. | Sodium | 200 | mgNa/l |
9. | F3. . . | F3. . . | F3. . . |
10. | Tetrachloromethane | 3 | µg/l |
11. | Turbidity(ii) | 4 | NTU |
12. | Zinc | 5000 | µg Zn/l |
Notes:
i
If Silver is used in a water treatment process, 80 may be substituted for 10.
ii
Every effort should be made to achieve 1 NTU whenever possible.
Table C Indicator parameters
Sch. 1 Table C 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), 8(b)(ii)
Sch. 1 Table C 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), 8(b)(iii)
Sch. 1 Table C 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), 8(b)(iv)
Words in Sch. 1 Table C 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), 8(b)(vi)
Word in Sch. 1 Table C inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 8(b)(vii)
Sch. 1 Table C 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), 8(b)(v)
(1)Item | (2)Parameters | (3)Concentration or Value (maximum F4unless otherwise stated) or State | (4)Units of Measurement |
|---|---|---|---|
1. | Ammonium | 0.50 | mgNH4/l |
2. | Chloride(i) | 250 | mgC1/1 |
3. | Clostridium perfringens (including spores) | 0 | Number/100 ml |
4. | Coliform bacteria | 0 | Number/100 ml |
5. | Colony count | No abnormal change | Number/1 ml at 22°C |
F55A | Colour | Acceptable to consumers and no abnormal change | |
6. | Conductivity(i) | 2500 | µS/cm at 20°C |
F66A | Hydrogen ion | 9.5 6.5 (minimum) | pH value |
F66B | Odour | Acceptable to consumers and no abnormal change | |
F66C. | Radon (for radioactivity)(ii) | 100 | Bq/l |
7. | Sulphate(i) | 250 | mgSO4/l |
F77A | Taste | Acceptable to consumers and no abnormal change | |
8. | Total indicative dose (for radioactivity)F9... | 0.10 | mSvF9... |
9. | Total organic carbon (TOC) | No abnormal change | mgC/l |
10. | Tritium (for radioactivity) F10(iii) | 100 | Bq/l |
F810A | Turbidity | Acceptable to consumers and no abnormal change |
Notes:
i
The water should not be aggressive.
F11ii
Remedial action is to be deemed justified on radiological protection grounds, without further consideration, where radon concentrations exceed 1,000 Bq/l.
iii
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.
Table D Microbiological and Chemical Parameters: Type B Supplies
(1)Item | (2)Parameters | (3)Concentration or Value (maximum) | (4)Units of Measurement |
|---|---|---|---|
1. | Coliform Bacteria | 0 | number/100ml |
2. | Conductivity (i) | 2500 | µS/cm at 20°C |
3. | Enterococci | 0 | number/100ml |
4. | Escherichia coli (E.coli) | 0 | number/100ml |
5. | Hydrogen ion | 9.5 6.5 (minimum) | pH value |
6. | Lead |
| µgPb/l |
7. | Nitrate | 50 | mgNO3/l |
8. | Odour-qualitative | - | - |
9. | Taste-qualitative | - | - |
10. | Turbidity | 4 | NTU |
Notes:
i
The water should not be aggressive.
SCHEDULE 2PARAMETERS, MONITORING AND SAMPLING FREQUENCIES
Table A
Sch. 2 Table A omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(xi) (with reg. 2)
F12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table B
Sch. 2 Table B omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(xi) (with reg. 2)
F13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table CRoutine Monitoring: Type B Supplies
Parameters
1
Coliform bacteria
2
Conductivity
3
Enterococci
4
Escherichia coli (E. coli)
5
Hydrogen ion
6
Lead
7
Nitrate(i)
8
Odour – qualitative(ii)
9
Taste – qualitative(ii)
10
Turbidity
Notes:
i
Samples need not be analysed for nitrate if there are reasonable grounds for believing that nitrate levels in the locality concerned are below 25 mg NO3/l.
ii
Samples should not be assessed qualitatively if there are reasonable grounds for suspecting that the water may give rise to a health hazard.
F14SCHEDULE 2AMONITORING OF RADIOACTIVE SUBSTANCES
Sch. 2A omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(xii) (with reg. 2)
General principles and monitoring frequenciesF141
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RadonF142
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TritiumF143
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total indicative doseF144
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Water treatmentF145
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AveragingF146
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F15SCHEDULE 3CIRCUMSTANCES AND CONDITIONS TO BE CONSIDERED BY A MONITORING LOCAL AUTHORITY: DECISION ON AUDIT MONITORING
Sch. 3 omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(xiii) (with reg. 2)
F15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCHEDULE 4REQUIREMENTS FOR RISK ASSESSMENT
1
When undertaking or reviewing and updating a risk assessment for the purposes of regulations F17... 27, a monitoring local authority shall do so in accordance with the provisions of this Schedule.
2
A risk assessment shall comprise the following–
a
documentation on and a description of the private water supply, including the catchment from which the supply draws water;
b
a hazard assessment and risk characterisation;
c
an identification of the measures by which risks may be controlled; and
d
establishment of verification procedures,
and for the purposes of this paragraph, “hazard” means a biological, chemical, physical or radiological agent that has the potential to cause harm or danger to human health; and “risk” means the likelihood of identified hazards causing harm in exposed populations in a specified time, including the magnitude of that harm and/or the consequences of such harm.
3
In respect of a private water supply which comprises, either alone or in any combination thereof, catchments, surface water or ground water, the risk assessment shall include provision in relation to the relevant matters specified in Table A of this Schedule.
4
In respect of a private water supply which receives treatment, including treatment at source and at any point thereafter, the risk assessment shall make provision in relation to the relevant matters specified in Table B of this Schedule.
5
In respect of a private water supply which comprises intermediate tanks and distribution, the risk assessment shall include provision in relation to the relevant matters specified in Table C of this Schedule.
(1)Source of private water supply | (2)Information to be considered in the risk assessment |
|---|---|
(1) Catchments | (i) geology and hydrology |
| (ii) meteorology and weather patterns |
| (iii) general catchment and river health |
| (iv) wildlife |
| (v) competing water uses |
| (vi) nature and intensity of development and land use |
| (vii) other activities in the catchment that potentially release contaminants into source water |
| (viii) planned future activities |
(2) Surface water | (i) description of water body type (e.g. river, reservoir, dam) |
| (ii) flow and reliability of source water |
| (iii) retention times |
| (iv) water constituents (physical, chemical, microbial) |
| (v) protection (e.g. enclosures, access) |
| (vi) recreational and other human activity |
| (vii) bulk water transport |
(3) Groundwater | (i) confined or unconfined aquifer |
| (ii) aquifer hydrogeology |
| (iii) flow rate and direction |
| (iv) dilution characteristics |
| (v) recharge area |
| (vi) wellhead protection |
| (vii) depth of casing |
| (viii) bulk water transport |
(i) treatment processes |
(ii) equipment design |
(iii) monitoring equipment and automation |
(iv) water treatment chemicals used |
(v) treatment efficiencies |
(vi) disinfection removals of pathogens |
(vii) disinfection residuals/contact time |
(i) reservoir/tank design |
(ii) retention times |
(iii) seasonal variations |
(iv) protection (e.g. covers, enclosures, access) |
(v) distribution system design |
(vi) hydraulic conditions (e.g. water age, pressures, flows) |
(vii) backflow protection |
(viii) disinfectant residuals |
SCHEDULE 5ANALYTICAL METHODOLOGY
(1)Parameter | (2)Method |
|---|---|
Clostridium perfringens (including spores) | Membrane filtration followed by anaerobic incubation of the membrane on m–CP agar(i) 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. |
Coliform bacteria | ISO 9308–1 |
Colony count 22°C – enumeration of culturable micro-organisms | prEN ISO 6222 |
Enterococci | ISO 7899–2 |
Escherichia coli (E.coli) | ISO 9308–1 |
i
The composition of m–CP agar is:
Basal medium
Tryptose
30g
Yeast extract
20g
Sucrose
5g
L–cysteine
1g
MgSO4 . 7H2O
0.1g
Bromocresol purple
40mg
Agar
15g
Water
1,000ml
Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for 15 minutes. Allow the medium to cool and add:
D–cycloserine
400mg
Polymyxine–B–sulphate
25mg
Indoxyl–β-D-glucoside
to be dissolved in 8ml sterile water before addition
60mg
Filter – sterilised 0.5% phenolphthalein disphosphate solution
20ml
Filter – sterilised 4.5% FeC13 . 6H2O
2ml
(1)Item No. | (2)Parameters | (3)Trueness % of prescribed concentration or value or specification | (4)Precision % of prescribed concentration or value or specification | (5)Limit of detection % of prescribed concentration or value or specification |
|---|---|---|---|---|
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. | Cyanide(i) | 10 | 10 | 10 |
16. | 1,2–dichloroethane | 25 | 25 | 25 |
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. | Pesticides and related products(ii) | 25 | 25 | 25 |
26. | Polycyclic aromatic hydrocarbons(iii) | 25 | 25 | 25 |
27. | Selenium | 10 | 10 | 10 |
28. | Sodium | 10 | 10 | 10 |
29. | Sulphate | 10 | 10 | 10 |
30. | Tetrachloroethene(iv) | 25 | 25 | 10 |
31. | Tetrachloromethane | 20 | 20 | 20 |
32. | Trichloroethene(iv) | 25 | 25 | 10 |
33. | Trihalomethanes:Total(iii) | 25 | 25 | 10 |
34. | Turbidity(v) | 10 | 10 | 10 |
Notes:
ii
The method of analysis should determine total cyanide in all forms.
iii
The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned.
iv
The performance characteristics apply to the individual substances specified at 25% of the parametric value in Table B in Schedule 1.
v
The performance characteristics apply to the individual substances specified at 50% of the parametric value in Table B in Schedule 1.
vi
The performance characteristics apply to the prescribed value of 4NTU.
F16SCHEDULE 5AMONITORING FOR TOTAL INDICATIVE DOSE AND ANALYTICAL PERFORMANCE CHARACTERISTICS
Sch. 5A omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(xv) (with reg. 2)
Monitoring for compliance with the total indicative doseF161
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Screening for certain radionuclides or for an individual radionuclideF162
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Screening for gross alpha activity and gross beta activityF163
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calculation of the total indicative doseF164
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance characteristics and methods of analysisF165
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Words in Sch. 1 Table C inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 8(b)(i)