Water contamination

Scott Cooper made this Environmental Information Regulations request to United Utilities Water PLC
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The request was partially successful.

Dear United Utilities Water PLC,

Please provide the following

1. What are the health implications of the added Chlorine to human health?
a) Can the treatment process of fresh water remove pesticides and weed killers?
2. Where is water extracted for testing for the M6 area of Salford?
3. Please provide data for water testing for 2011 onwards for the M6 area of Salford (yearly breakdown)

Yours faithfully,

Scott Cooper

Jain, Rajat, United Utilities Water PLC

PLEASE QUOTE THE LEGAL SUBJECT HEADER
REFERENCE IN ALL COMMUNICATIONS
 
 
 
Dear Mr Cooper
 
Re: Your request for information
 
We write further to your request for information submitted via the
"whatdotheyknow" website.
 
Before we respond in full to the balance of your requests, upon review of
your request, we consider that we require some clarification on the
following of your questions in help us provide you with the information
you require:
 
2. Where is water extracted for testing for the M6 area of Salford?
 
We abstract water from the environment, treat it and then supply to our
customers. Testing (Water quality sampling) does occur on water at the
point of abstraction. However we also test the water we are treating at
the water treatment works, and also the water ultimately supplied to
customers through their taps, (known as the drinking water register).
 
So are you interested in knowing:
 
- where water supplied to the M6/Salford area is abstracted from in the
environment, or
- where it is produced/treated and an explanation of the sampling regime,
or
- the actual sampling locations for where it is tested at the point of
abstraction, and/or
- the testing locations within the water treatment plant.
 
In any event, unfortunately due to the way our records are held, it is not
recorded by reference to stretches of the M6. Subject to which of the
options outlined above you require, it would be more helpful if you could
provide us with a specific post code area you wish the information to
cover.
 
 
3. Please provide data for water testing for 2011 onwards for the M6 area
of Salford (yearly breakdown)
 
 
Again we would need a full post code in order to confirm the supply
arrangements and so as to provide you with any data.
 
Also are you asking for a copy of the drinking water register for each
year for the water in the water supply zone for the post code area being
specifiied.
 
We look forward to hearing from you further.
 
Yours sincerely
 
 
Rajat Jain
Data Protection & Fraud
Legal Department
United Utilities 
unitedutilities.com
 

show quoted sections

Dear Jain, Rajat,

I was informed by an engineer that there are set sites where water is tested along the supply network for areas.
Could you supply the information on the following
- where it is produced/treated and an explanation of the sampling regime,
or
- the actual sampling locations for where it is tested at the point of
abstraction, and
- the testing locations within the water treatment plant. and sites where quality testing along the pipe network to the Salford area is carried out (M6 7LZ)

3. Please provide data for water testing for 2011 onwards for the M6 area
of Salford (yearly breakdown)
M6 7LZ

I am not sure what the register is, but if this contains information similar to what I requested, then yes this would be helpful.

Yours sincerely,

Scott Cooper

Jain, Rajat, United Utilities Water PLC

1 Attachment

PLEASE QUOTE THE LEGAL SUBJECT HEADER

REFERENCE IN ALL COMMUNICATIONS

 

By e-mail only [1][FOI #376393 email]

 

 

 

Dear Mr Cooper

 

Re: Your request for information

 

We write further to your request for information dated 10^th December
2016, and thank you for your subsequent clarification

 

For convenience, we extract copies of both:

 

Request – 10^th December 2016

 

Please provide the following

 

1. What are the health implications of the added Chlorine to human health?

a) Can the treatment process of fresh water remove pesticides and weed
killers?

2. Where is water extracted for testing for the M6 area of Salford?

3. Please provide data for water testing for 2011 onwards for the M6 area
of Salford (yearly breakdown)

 

Your clarification given on 10^th January 2017

 

I was informed by an engineer that there are set sites where water is
tested along the supply network for areas.

Could you supply the information on the following

- where it is produced/treated and an explanation of the sampling regime,
or

- the actual sampling locations for where it is tested at the point of
abstraction, and

- the testing locations within the water treatment plant. and sites where
quality testing along the pipe network to the Salford area is carried out
(M6 7LZ)

 

3. Please provide data for water testing for 2011 onwards for the M6 area
of Salford (yearly breakdown)

M6 7LZ

 

I am not sure what the register is, but if this contains information
similar to what I requested, then yes this would be helpful.

 

Whilst in respect of Questions 1  & 1a, we consider these are rather broad
general questions, and are a matter of opinion, in an attempt to be
helpful kindly note our responses as follows:

 

1. What are the health implications of the added Chlorine to human health?

 

Notwithstanding that we consider this to be an opinion rather than
specific information we hold, we rely on information held by, or guidance
provided by, some regulators and other bodies such as the Drinking Water
Inspectorate and the World Health Organisation. To that end, you may wish
to approach those bodies for any specific guidance on this issue.

 

However we can advise that Chlorine is added to water supplies to protect
human health. Without the use of chlorine of other disinfection agents
water supplies would contain pathogens that present a risk to health.
Chlorine is the final stage of treatment to “kill” any such pathogens or
microorganisms that remain after the other stages of treatment.

 

The World Health Organisation states that disinfection is of
unquestionable importance in the supply of safe drinking-water. Chlorine
is the most frequently used disinfection agent in water supplies because
residual chlorine safeguards against low-level contamination and
microbiological growth within the distribution system.

 

“In humans and animals exposed to chlorine in drinking-water, specific
adverse treatment related effects have not been observed. The guideline
value for free chlorine in drinking-water is 5mg/litre (rounded figure).
It should be noted, however, that this value is conservative, as no
adverse effect level was identified.”

 

“For effective disinfection, there should be a residual concentration of
free chlorine of ≥ 0.5 mg/l after at least 30 min contact time at pH <
8.0. A chlorine residual should be maintained throughout the distribution
system. At the point of delivery, the minimum residual concentration of
free chlorine should be 0.2 mg/l.”
[2]http://www.who.int/water_sanitation_heal...

 

a) Can the treatment process of fresh water remove pesticides and weed
killers?

 

The ability of treatment processes to remove pesticides including weed
killers (or herbicides) is dependent on the pesticide and the treatment
process. Many herbicides are effectively removed by one or more of the
treatment processes used by United Utilities. Water supplies are routinely
monitored for pesticide concentrations where a risk is identified and we
mitigate the risk of pesticides being found in drinking water through a
combination of catchment control measures and treatment measures.

 

 

2. Where is water extracted for testing for the M6 area of Salford?

 

Following on from your clarification that the information was to relate to
M6 7LZ, we can advise:

 

The Water supply zone for your area is Kersal, and the water supply zone
code is Z285. Water supply to your postcode comes from Thirlmere Reservoir
and Haweswater Reservoir in the Lake District, it is then transported to
Greater Manchester via aqueducts and treated at Lostock and Woodgate Hill
Water Treatment Works before distribution to customers. Water flowing to
Woodgate Hill goes via Watchgate Water Treatment Works first.

 

- the actual sampling locations for where it is tested at the point of
abstraction, and

- the testing locations within the water treatment plant. and sites where
quality testing along the pipe network to the Salford area is carried out
(M6 7LZ)

 

 

As indicated above, the water supply to Z285 Kersal is treated at Lostock
and Woodgate Hill Water Treatment Works . We undertake sampling and
monitoring of water quality as water enters the treatment works, through
the treatment process and as it leaves the treatment works at the
compliance sample point. Additional samples are taken from customer
properties selected at random in the water supply zones area after the
water has left the treatment works to confirm that water quality is
maintained throughout the treatment process.

 

The official raw water regulatory abstraction points and final water
sampling points for Lostock and Woodgate Hill WTW that are in Table 1
below

 

Table 1: Regulatory abstraction point at inlet to works and final water
points

 

MPID DWI Ref DWI Name MPID DWI Ref DWI Name
215172 A195a     Lostock Raw No. 1 212303 T195      Lostock
(North)                                                       WTW                                                                                    
215173 A195b     Lostock Raw No 1 (South) alternative sampling 212303 T195      Lostock
point                             WTW                                                                                    
18478 A087a     Woodgate Hill Raw 18475 T087      Woodgate Hill No2 WTW   
water                                                                                                                                    
18478 A087a     Woodgate Hill Raw 217336 T221      Woodgate Hill No1 WTW                       
water                                                                                                                

 

MPID = Monitoring Point Identification No.

DWI = the Drinking Water Inspectorate

 

 

Woodgate Hill is supplied by Watchgate Water Treatment Works Final via the
Haweswater Aqueduct and has it’s own regulatory raw water abstraction
point and final water point in Table 2 below.

 

Table 2:  Watchgate regulatory raw water abstraction and final sample
points

 

MPID DWI DWI Name MPID DWI DWI Name
Ref Ref
210994 Watchgate 20473 Watchgate WTW          
A046  Blended T046                                                
Raw

 

Please note that the original sources are also sampled for internal
operational use. However for security reasons, we are withholding this
information under the Environmental Information Regulations 2005
Regulation 12(5)(a), as clearly putting details of sampling locations
carries a security risk. Clearly the need to protect the public with the
need to withhold such locations is more in their interest to receive this
information.  

 

3. Please provide data for water testing for 2011 onwards for the M6 area
of Salford (yearly breakdown)

M6 7LZ

 

Unfortunately we are still in the process of compiling and reviewing the
information (in terms of whether we are able to provide this). However if
we are able to, then we will let you have the information as soon as this
to hand.

 

We hope that this now meets with part of your request. Should you consider
that that we have not adequately complied with our obligations under EIR,
you have the right to ask us to carry out an internal review, by writing
to David Hannon Head of Legal, United Utilities, Legal Department,
Grasmere House First Floor, Lingley Mere Business Park, Lingley Green
Avenue, Great Sankey, Warrington, WA5 3LP. Alternatively, you may find it
easier to e-mail us directly on [3][United Utilities request email] and your review
request will be forwarded on to Mr Hannon.

 

Your request for review should explain why you wish a review to be carried
out, and should be made within 40 working days of receipt of this letter,
and we will reply within 40 working days of receipt. If you are not
satisfied with the result of the review, you then have the right to make a
formal complaint to the Information Commissioner.

 

We do however add, that although you are perfectly entitled to seek an
internal review at this stage (should you wish to), you may perhaps feel
that it would be more sensible to consider whether this is required once
you have received our response to Question 3 above. We shall leave that to
your discretion.

 

Finally, kindly acknowledge receipt by return of e-mail.

 

Yours sincerely

 

 

 

Rajat Jain

Data Protection & Fraud

Legal Department

United Utilities 

unitedutilities.com

References

Visible links
1. mailto:[FOI #376393 email]
2. http://www.who.int/water_sanitation_heal...
3. mailto:[United Utilities request email]

Jain, Rajat, United Utilities Water PLC

2 Attachments

PLEASE QUOTE THE LEGAL SUBJECT HEADER

REFERENCE IN ALL COMMUNICATIONS

 

 

 

Dear Mr Cooper

 

Re: Your request for information – under the Environmental Information
Regulations 2004 (EIR)

 

We write further to our e-mail of the 7^th February 2017.

 

As advised, please now find attached the data relating to your question 3.

 

We now take this opportunity once again to remind you of the following:

 

Should you consider that that we have not adequately complied with our
obligations under EIR, you have the right to ask us to carry out an
internal review, by writing to David Hannon Head of Legal, United
Utilities, Legal Department, Grasmere House First Floor, Lingley Mere
Business Park, Lingley Green Avenue, Great Sankey, Warrington, WA5 3LP.
Alternatively, you may find it easier to e-mail us directly on
[1][United Utilities request email] and your review request will be forwarded on to
Mr Hannon.

 

Your request for review should explain why you wish a review to be carried
out, and should be made within 40 working days of receipt of this letter,
and we will reply within 40 working days of receipt. If you are not
satisfied with the result of the review, you then have the right to make a
formal complaint to the Information Commissioner.

 

Kindly acknowledge receipt

 

Yours sincerely

 

 

Rajat Jain

Data Protection & Fraud

Legal Department

United Utilities 

unitedutilities.com

 

From: Jain, Rajat
Sent: 07 February 2017 14:50
To: '[FOI #376393 email]'
<[FOI #376393 email]>
Subject: Environmental Information Regulations request - Water
contamination Legal/EIR/2016/12/ID230- Scott Cooper (WHO02.21031)
Legal/EIR/2016/12/ID230- Scott Cooper (WHO02.21031)

 

PLEASE QUOTE THE LEGAL SUBJECT HEADER

REFERENCE IN ALL COMMUNICATIONS

 

By e-mail only [2][FOI #376393 email]

 

 

 

Dear Mr Cooper

 

Re: Your request for information

 

We write further to your request for information dated 10^th December
2016, and thank you for your subsequent clarification

 

For convenience, we extract copies of both:

 

Request – 10^th December 2016

 

Please provide the following

 

1. What are the health implications of the added Chlorine to human health?

a) Can the treatment process of fresh water remove pesticides and weed
killers?

2. Where is water extracted for testing for the M6 area of Salford?

3. Please provide data for water testing for 2011 onwards for the M6 area
of Salford (yearly breakdown)

 

Your clarification given on 10^th January 2017

 

I was informed by an engineer that there are set sites where water is
tested along the supply network for areas.

Could you supply the information on the following

- where it is produced/treated and an explanation of the sampling regime,
or

- the actual sampling locations for where it is tested at the point of
abstraction, and

- the testing locations within the water treatment plant. and sites where
quality testing along the pipe network to the Salford area is carried out
(M6 7LZ)

 

3. Please provide data for water testing for 2011 onwards for the M6 area
of Salford (yearly breakdown)

M6 7LZ

 

I am not sure what the register is, but if this contains information
similar to what I requested, then yes this would be helpful.

 

Whilst in respect of Questions 1  & 1a, we consider these are rather broad
general questions, and are a matter of opinion, in an attempt to be
helpful kindly note our responses as follows:

 

1. What are the health implications of the added Chlorine to human health?

 

Notwithstanding that we consider this to be an opinion rather than
specific information we hold, we rely on information held by, or guidance
provided by, some regulators and other bodies such as the Drinking Water
Inspectorate and the World Health Organisation. To that end, you may wish
to approach those bodies for any specific guidance on this issue.

 

However we can advise that Chlorine is added to water supplies to protect
human health. Without the use of chlorine of other disinfection agents
water supplies would contain pathogens that present a risk to health.
Chlorine is the final stage of treatment to “kill” any such pathogens or
microorganisms that remain after the other stages of treatment.

 

The World Health Organisation states that disinfection is of
unquestionable importance in the supply of safe drinking-water. Chlorine
is the most frequently used disinfection agent in water supplies because
residual chlorine safeguards against low-level contamination and
microbiological growth within the distribution system.

 

“In humans and animals exposed to chlorine in drinking-water, specific
adverse treatment related effects have not been observed. The guideline
value for free chlorine in drinking-water is 5mg/litre (rounded figure).
It should be noted, however, that this value is conservative, as no
adverse effect level was identified.”

 

“For effective disinfection, there should be a residual concentration of
free chlorine of ≥ 0.5 mg/l after at least 30 min contact time at pH <
8.0. A chlorine residual should be maintained throughout the distribution
system. At the point of delivery, the minimum residual concentration of
free chlorine should be 0.2 mg/l.”
[3]http://www.who.int/water_sanitation_heal...

 

a) Can the treatment process of fresh water remove pesticides and weed
killers?

 

The ability of treatment processes to remove pesticides including weed
killers (or herbicides) is dependent on the pesticide and the treatment
process. Many herbicides are effectively removed by one or more of the
treatment processes used by United Utilities. Water supplies are routinely
monitored for pesticide concentrations where a risk is identified and we
mitigate the risk of pesticides being found in drinking water through a
combination of catchment control measures and treatment measures.

 

 

2. Where is water extracted for testing for the M6 area of Salford?

 

Following on from your clarification that the information was to relate to
M6 7LZ, we can advise:

 

The Water supply zone for your area is Kersal, and the water supply zone
code is Z285. Water supply to your postcode comes from Thirlmere Reservoir
and Haweswater Reservoir in the Lake District, it is then transported to
Greater Manchester via aqueducts and treated at Lostock and Woodgate Hill
Water Treatment Works before distribution to customers. Water flowing to
Woodgate Hill goes via Watchgate Water Treatment Works first.

 

- the actual sampling locations for where it is tested at the point of
abstraction, and

- the testing locations within the water treatment plant. and sites where
quality testing along the pipe network to the Salford area is carried out
(M6 7LZ)

 

 

As indicated above, the water supply to Z285 Kersal is treated at Lostock
and Woodgate Hill Water Treatment Works . We undertake sampling and
monitoring of water quality as water enters the treatment works, through
the treatment process and as it leaves the treatment works at the
compliance sample point. Additional samples are taken from customer
properties selected at random in the water supply zones area after the
water has left the treatment works to confirm that water quality is
maintained throughout the treatment process.

 

The official raw water regulatory abstraction points and final water
sampling points for Lostock and Woodgate Hill WTW that are in Table 1
below

 

Table 1: Regulatory abstraction point at inlet to works and final water
points

 

MPID DWI Ref DWI Name MPID DWI Ref DWI Name
215172 A195a     Lostock Raw No. 1 212303 T195      Lostock
(North)                                                       WTW                                                                                    
215173 A195b     Lostock Raw No 1 (South) alternative sampling 212303 T195      Lostock
point                             WTW                                                                                    
18478 A087a     Woodgate Hill Raw 18475 T087      Woodgate Hill No2 WTW   
water                                                                                                                                    
18478 A087a     Woodgate Hill Raw 217336 T221      Woodgate Hill No1 WTW                       
water                                                                                                                

 

MPID = Monitoring Point Identification No.

DWI = the Drinking Water Inspectorate

 

 

Woodgate Hill is supplied by Watchgate Water Treatment Works Final via the
Haweswater Aqueduct and has it’s own regulatory raw water abstraction
point and final water point in Table 2 below.

 

Table 2:  Watchgate regulatory raw water abstraction and final sample
points

 

MPID DWI DWI Name MPID DWI DWI Name
Ref Ref
210994 Watchgate 20473 Watchgate WTW          
A046  Blended T046                                                
Raw

 

Please note that the original sources are also sampled for internal
operational use. However for security reasons, we are withholding this
information under the Environmental Information Regulations 2005
Regulation 12(5)(a), as clearly putting details of sampling locations
carries a security risk. Clearly the need to protect the public with the
need to withhold such locations is more in their interest to receive this
information.  

 

3. Please provide data for water testing for 2011 onwards for the M6 area
of Salford (yearly breakdown)

M6 7LZ

 

Unfortunately we are still in the process of compiling and reviewing the
information (in terms of whether we are able to provide this). However if
we are able to, then we will let you have the information as soon as this
to hand.

 

We hope that this now meets with part of your request. Should you consider
that that we have not adequately complied with our obligations under EIR,
you have the right to ask us to carry out an internal review, by writing
to David Hannon Head of Legal, United Utilities, Legal Department,
Grasmere House First Floor, Lingley Mere Business Park, Lingley Green
Avenue, Great Sankey, Warrington, WA5 3LP. Alternatively, you may find it
easier to e-mail us directly on [4][United Utilities request email] and your review
request will be forwarded on to Mr Hannon.

 

Your request for review should explain why you wish a review to be carried
out, and should be made within 40 working days of receipt of this letter,
and we will reply within 40 working days of receipt. If you are not
satisfied with the result of the review, you then have the right to make a
formal complaint to the Information Commissioner.

 

We do however add, that although you are perfectly entitled to seek an
internal review at this stage (should you wish to), you may perhaps feel
that it would be more sensible to consider whether this is required once
you have received our response to Question 3 above. We shall leave that to
your discretion.

 

Finally, kindly acknowledge receipt by return of e-mail.

 

Yours sincerely

 

 

 

Rajat Jain

Data Protection & Fraud

Legal Department

United Utilities 

unitedutilities.com

References

Visible links
1. mailto:[United Utilities request email]
2. mailto:[FOI #376393 email]
3. http://www.who.int/water_sanitation_heal...
4. mailto:[United Utilities request email]

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