Transcript The Private Water Supply (Scotland) Regulations 2006

The Private Water Supply
(Scotland) Regulations 2006
Perth and Kinross Council
Environment Service
Mary Anderson
Overview
• Background to the new legislation
• Risk Assessment based approach
• Type A supplies
• Grants
• Food Businesses
• Questions welcome throughout
Background to the new legislation
• Real risks of ACUTE waterborne illness
• Bacterial - Campylobacter, Salmonella, Shigella,
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E.coli O157
Viral – Hepatitis A and E, small round structured
(Norovirus etc)
Protozoan – Cryptosporidium, Giardia,
Entamoeba
Others – Cyanobacteria (Blue Green Algae)
pseudomonas, areomonas
• ACUTE effects can include diarrhoea,
sickness, kidney failure
• Unquantifiable risk of CHRONIC conditions
from metals, minerals, pesticides etc.
• Research shows severe under reporting of
illness in rural areas due to stoicism, busy
farmers, problems of access etc.
• Faecal coliforms (E.coli) - the main
contamination threat
• Human produces 2 billion E.coli per day
• Seagull - 2 billion
• Pig
- 8.9 billion
• Cattle - 9 billion
• Sheep - 18 billion
• E.coli O157 carried by humans, cattle, sheep,
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deer, rabbits
Research by MLURI in Aberdeenshire on a large
number of supplies showed that ALL failed at
some point throughout the year
Average failure rate for bacterial samples
throughout Perth and Kinross in 2005 was 35% the majority of the supplies tested had
treatment on them
Failure rate can be 100% with adverse weather
conditions
Private Supply Sampling 2004
200
150
NUMBER OF B6 FAILURES
100
% OF FAILURES
50
Month
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Number
RAINFALL
Risk Assessment
• Designed to include all types and sizes of supply
• Highlight possible contamination routes
• Increase awareness of the potential risks
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amongst users
Increase awareness of the importance of
ongoing maintenance of sources and treatment
plant
Supplies are individual
Risk Assessment – a new approach
• Previous legislation relied on infrequent sampling
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to show problems
Risk Assessment based approach aims to reduce
overall potential for harm for the whole supply,
all year round
Aim is to educate users that they need to
consider and improve the complete supply,
reducing sources of contamination throughout
and considering treatment as the final step
Result should be health benefits for all of those
that consume water from private supplies
Type A supplies
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Hotels, Restaurants, Cafes
Campsites and Caravan sites
Self Catering
Public Access such as village and church Halls, Public
Toilets, Visitor Centres
Dairy Farms, Deer Larders (?), Butcheries, Smokeries,
Home caterers and other food businesses
Schools and residential facilities
Nurseries and home childminders
Domestic serving 50 or more persons (20 properties)
Type A supplies
• Must conform to EC standards
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Within Type A there are three useage levels:
1 – <100m3/day
2 – 100 – 1000 m3/day
3 - >1000m3/day
• The majority of Type A supplies are Level 1, this can
serve up to 500 users
• Over 200 Type A supplies in Perth and Kinross
Type A supplies – risk assessment
and sampling
• Statutory duty for Local Authority to risk assess
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all Type A supplies
Ongoing statutory sampling requirements,
frequency dependant on volume used. Majority
of Type A supplies will be once per year
Costs – Risk Assessment £120, Check and Audit
monitoring Max £580 per year for Type A 1
Check Monitoring
• Basic bacteriological and chemical
parameters
• Once per year for Type A 1 supplies
• More frequently for Type A 2,3
• Very few exemptions allowed
Check Monitoring Parameters
Parameter
Max Conc.
1
Aluminium
200 μg Al/l
2
Ammonium
0.50 mg NH4/L
3
Clostridium Perfringens (inc spores)
0 per 100ml
4
Coliform Bacteria
0 per 100ml
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Colony Counts
No change
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Colour
20 mg/l Pt/Co
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Conductivity
2500 μS/cm at 200C
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Escherichia coli
0 per 100ml
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Hydrogen ion (pH)
6.5 - 9.5
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Iron
200 μg Fe/l
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Nitrite
0.5 mg NO2/l
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Odour
3 at 250C
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Taste
3 at 250C
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Turbidity
4 NTU
Item No
Audit Monitoring Parameters
• Wide range of organic and inorganic parameters
• Once per year for Type A 1 supplies More frequently for
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Type A 2,3
Agreement required from Consultant in Public Health
Medicine with regard to Pesticides etc.
In the main, exemptions are only allowed if it can be
shown that the parameter is <75% of the prescribed
concentration
So - we have to sample to prove low level
Agreement required from the Consultant in Public Health
Medicine before omitting a parameter from future testing
Audit Monitoring Parameters
Item No
Parameter
Max Conc.
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Acrylamide
0.10 μg/l
2
Aluminium
200 μg Al/l
3
Antimony
5.0 μg Sb/l
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Arsenic
10 μg As/l
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Benzene
1.0 μg/l
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Benzo(a)pyrene
0.010 μg/l
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Boron
1.0 mg B/l
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Bromate
10 μg BrO3/l
9
Cadmium
5.0 μg Cd/l
10
Chloride
250 mg Cl/l
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Chromium
50 μg Cr/l
12
Clostridium Perfringens (inc spores)
0 per 100ml
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Copper
2.0 mg Cu/l
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Cyanide
50 μg CN/l
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1,2 dichloroethane
3.0 μg/l
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Enterococci
0 per 100ml
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Epichlorohydrin
0.10 μg/l
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Fluoride
1.5 mg F/l
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Iron
200 μg Fe/l
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Lead
25 μg/l
Audit Monitoring Parameters cont.
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Manganese
50 μg Mn/l
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Mercury
1.0 μg Hg/l
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Nickel
20 μg Ni/l
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Nitrate
50 mg NO3/l
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Nitrite
0.50 mg NO2/l
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Pesticides
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
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Pesticides - Total
0.50 μg/l
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Polycyclic Aromatic Hydrocarbons (PAH)
0.10 μg/l
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Selenium
10 μg Se/l
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Silver
10 μg Ag/l*
Audit Monitoring Parameters cont.
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Sodium
200 mg Na/l
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Sulphate
250 mg SO4/l
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Tetrachloroethene and Trichloroethane
10 μg/l
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Tetrachloromethane
3 μg/l
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Total indicative dose
0.10 mSv/year
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Total organic carbon
mg C/l
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Trihalomethanes - Total
100 μg/l
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Tritium
100 Bq/l
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Vinyl Chloride
0.50 μg/l
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Zinc
5000 μg/l
The Grants Scheme
• The Private Water Supplies (Grants)
(Scotland) Regulations 2006
• Available to nearly all properties served by
a private water supply
• Open to owner occupiers, landlords,
tenants
• Up to £800 per property
Grants Scheme - exemptions
• We cannot issue grants -
• retrospectively for works which are
already started or completed
• to allow users to connect to the public
mains water supply
• to certain people/properties
Food Businesses on PWS
• Food business = Commercial activity,
therefore Type A supply under PWS Regs
• Exemptions – no affect on final product,
dairy farms?, coffee grinders?, deer
larders? – FSA ‘guidance’ ?
• Currently over 90 in Perth and Kinross
Inspections – Info to gather/assess?
• Consider use of water? Clients/staff/family/activities/food
operations
• Query source of water e.g. burn versus borehole?
• Treatment available? Point of use > point of entry=grant
available, advise water team.
• Sample results retained/reviewed
• Maintenance records (FSMS, example form)
• Contingency plan re failures, temporary only (FSMS record)
• Poster displayed?
Informal/Formal Action?
• Educate/advise
• Liaison with Water Team/Food Teams
• Enforcement- better mechanisms under pws regs, but
food legislation may be easier re improvements notices?
• Questions?
In Conclusion
• The main aim is to safeguard the health of private water supply
users whether they inhabit or visit Perth and Kinross
• More information available from the Environment Service 01738
476476
• www.privatewatersupplies.gov.uk
• The full Regulations can be viewed online at:
• http://www.opsi.gov.uk/legislation/scotland/ssi2006/20060209.ht
m
• Questions Welcome