DEPARTMENT OF THE ENVIRONMENT
ENVIRONMENT DIVISION
WATER (JERSEY) LAW 1972
ARTICLE 10 – DUTY TO MONITOR
(Public)
Purpose of the Report
The Minister for Planning and Environment (The Minister) is requested to approve the proposed monitoring programme of treated water for 2012 that was submitted by The Jersey New Waterworks Company Limited (Jersey Water).
Background
Under Article 10(4) of the Water (Jersey) Law, 1972 as Amended, Jersey Water is required to submit its monitoring programme for treated water each year for the approval by The Minister.
Discussion
The monitoring programme submitted has been reviewed by the Department of the Environment in consultation with Health Protection of Health and Social Services and is deemed fit for purpose.
A copy of the proposed monitoring schedule for 2012 is attached to this report.
The monitoring programme is based on best practice in England and Wales in accordance with The Water Supply (Water Quality) Regulations 2000 (England and Wales).
Jersey Water proposes three changes to its 2011 monitoring schedule:
- The adoption of the standard monitoring frequency regime, as set out in the Water Supply (Water Quality) Regulations 2000 (England and Wales);
- Ceasing to monitor for Organochlorine and Organophosphorous pesticides and;
- Ceasing to monitor for Dalapon.
Jersey Water is adopting a targeted and cost-effective risk-based approach to its monitoring programme; whereby the sampling frequency, location and the determinants sampled is based on a thorough examination of use (likely occurrence) and risk to the water supply.
With respect to the first proposed change, Jersey Water has several years’ worth of historic water quality data providing a scientifically robust justification to move to the standard monitoring frequency as set out in the Water Supply (Water Quality) Regulations 2000 (England and Wales).
The cessation of monitoring for Organochlorine and Organophosphorous pesticides is deemed a reasonable risk based approach, given that these types of pesticides are not imported into the Island in any significant quantity and have not been detected within the water supply.
Whilst Dalapon is a pesticide, it can also be produced as a disinfection by-product during the chloramination water treatment process used by Jersey Water. The cessation of monitoring for Dalapon on the water supply side is reasonable as it has been demonstrated that the occasional detections of Dalapon within the water supply (at concentrations well below any health-based values) are associated with the disinfection process rather than any pesticide product present in raw waters. As an additional safeguard, Dalapon will continue to be monitored within raw waters prior to treatment
Recommendation
- The Minister approves the proposed monitoring programme submitted by Jersey Water for the calendar year 2012.
ii. Notify Jersey Water confirming approval of the monitoring programme for 2012.
Written by: Head of Water Resources, Environment Department
Approved by:
Attachments:
Proposed Regulatory Monitoring Schedule for the Year 2012- Jersey Water
[File Ref]
Ministerial Decision ref:
03 November 2011
Proposed Regulatory Monitoring Schedule for the Year 2012
Water Supply Zones
The sampling frequencies set out in The Water Supply (Water Quality) Regulations 2000 (England and Wales) are based on the population size of the zone. The population of the Island is 89,300 and the Company supplies approximately 90%; therefore the population supplied is approximately 80,000.
For the purposes of the setting the sampling frequencies, the population size will be taken as 100,000 and the Island taken as one supply zone.
Table 2 in schedule 3 of the Regulations sets out the frequency of sampling the water supply zones as listed below. The proposed sampling frequency per zone is highlighted in bold.
Table 2
Check monitoring |
Parameter | Population size | Reduced | Standard |
E.coli | <100 ≥100 | | 4 12 per 5,000 population ie 240 |
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 | 1 2 6 12 18 26 38 | 2 4 12 24 36 52 76 |
Ammonium |
Clostridium perfringens (including spores) |
Colony counts |
Colour |
Conductivity |
Hydrogen ion |
Iron |
Manganese |
Nitrate |
Nitrite |
Odour |
Taste |
Turbidity |
Table 2 (cont’d)
Audit monitoring |
Parameter | Population size | Reduced | Standard |
Aluminium | <100 100-4,999 5,000-100,000 | | 1 4 8 |
Antimony |
Arsenic |
Benzene |
Benzo(a)pyrene |
Boron |
Cadmium |
Chromium |
Copper |
Cyanide |
1,2 dichloroethane |
Enterococci |
Fluoride |
Iron |
Lead |
Manganese |
Mercury |
Nickel |
Nitrate |
Nitrite |
Pesticides and related products |
Polycyclic aromatic hydrocarbons |
Selenium |
Sodium |
Trichloroethene |
Tetrachloromethane |
Trihalomethanes |
Chloride |
Sulphate |
Total organic carbon |
Tritium |
Gross alpha |
Gross beta |
The Company uses aluminium sulphate as a flocculant in the primary treatment process, therefore the sample frequency for aluminium will be at the check monitoring frequency.
As the water the Company uses originates from, or is influenced by, surface waters, the sampling frequency for iron, manganese and Clostridium perfringens (including spores) will be at the check monitoring frequency.
The Company uses the chloramination disinfection process, therefore the sampling frequency for nitrate and nitrite will be at the check monitoring frequency.
Treatment Works and Supply Points
The Company has two water treatment works located at Augres WTW and Handois WTW. Both treatment works use clarifiers (chemical assisted sedimentation) for primary treatment, followed by rapid gravity filtration using dual media (anthracite and sand). During 2010 Augres WTW supplied an average of 10,160 m3/d and Handois WTW 9,617 m3/d.
The Company has a treated water service reservoirs (SR) at Westmount Road, St. Helier (9Ml capacity) and Les Platons, Trinity (9Ml capacity).
For the purpose of the monitoring regulations, Augres WTW and Handois WTW will be referred to as treatment works and all of the above sites (Augres WTW, Handois WTW, Westmount SR and Les Platons SR) will count as supply points.
Table 3 in schedule 3 of the Regulations sets out the frequency of sampling the treatment works or supply points as listed below. The proposed sampling frequencies are highlighted in bold.
Table 3
Item no | Substances and parameters | Volume of water supplied m3/d | Reduced | Standard |
1 | E.coli | <20 20-1,999 2,000-5,999 6,000-11,999 >12,000 | 12 52 104 104 | 4 52 104 208 365 |
2 | Coliform bacteria |
3 | Colony counts |
4 | Nitrite |
5 | Residual disinfectant |
6 | Turbidity |
Subject to check monitoring |
7 | Clostridium perfringens | 10,000-15,999 16,000-32,999 | 26 52 | 52 104 |
8 | Conductivity |
Subject to audit monitoring |
9 | Benzene | <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 |
10 | Boron |
11 | Bromate |
12 | Cyanide |
13 | 1,2 dichloroethane |
14 | Fluoride |
15 | Mercury |
16 | Nitrite |
17 | Pesticides and related products |
18 | Trichloroethene } Tetrachloroethene } |
19 | Tetrachloromethane |
20 | Chloride |
21 | Sulphate |
22 | Total organic carbon |
23 | Tritium |
24 | Gross alpha |
25 | Gross beta |
Parameters labelled as items 1 to 6 for sampling at the treatment works only.
Parameters labelled as items 7 to 25 are for sampling at supply points.
The Company uses the chloramination disinfection process, therefore the sampling frequency for nitrite will be at the check monitoring frequency as listed under item 4 in table 3.
As the water the Company uses originates from, or is influenced by, surface waters, Clostridium perfringens (including spores) will be sampled as part of the check monitoring in supply points.
The Company does not add sodium hypochlorite after the water has left the treatment works, therefore audit monitoring for bromate (a possible disinfection by-product) shall take place at the supply points.
All check monitoring will take place at the standard frequency as indicated in the above tables, with one exception if it is granted. The exception the Company would like to apply for the frequency of nitrite monitoring at treatment works to be at the reduced rate. Results for the last two years have been below the EU regulatory limit of 0.1 mg/l, the highest result being 0.009 mg/l.
It is proposed that analysis for the parameters given in the monitoring schedules will be undertaken by either the Company laboratory or their consulting analysts.
22nd June 2011
Pesticides analysed for at the supply points and in the supply zone
Phenoxyalkanoic Acid Herbicides Oxynil Herbicides
Pentachlorophenol (PCP) 2,4-D.B. Bromoxynil
M.C.P.A. Chlorthal Ioxynil
2,4-D Triclopyr
Mecoprop Dichlorprop Triazole
2,4,5-Trichlorophenoxyacetic acid Dicamba
2,3,6-Trichlorobenzoic acid M.C.P.B Propiconazole
Tebuconazole
Urea Herbicides Triazines
Chlortoluron Isoproturon Atrazine Simazine
Linuron Diuron Prometryn Propazine
Carbetamide Monolinuron Trietazine Terbutryn
Methabenzthiazuron Terbuthylazine Cyanazine
Carbamate Others
Chlorpropham Glyphosate
Oxamyl Bentazone
1,3 Dicloropropene (cis)
1,3 Dicloropropene (trans)
Chlorthal-dimethyl
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