SELBY 2004 ( ) WATER SUPPLY ZONE. COMMENTARY ON WATER QUALITY

Transcription

1 SELBY 2004 ( ) WATER SUPPLY ZONE. COMMENTARY ON WATER QUALITY The water supplied to the zone is classified as being hard water, which is borehole/river derived. As we have a grid system in place whereby we can move water around the Yorkshire region as required, occasionally the hardness of your water may vary. No fluoride is added to the water. Any fluoride that is there is naturally occurring. Samples taken in the period showed that the water complied in most respects with the prescribed standards. The infringement in respect of Total coliforms was isolated and not indicative of contamination of the system. Resamples taken were free from total coliforms. The infringement noted presents no hazard to public health. DETAILS OF UNDERTAKINGS AND NOTICES APPLICABLE 1) Undertaking YKS 3264 in relation to Total Pesticides and Metaldehyde, due to risk of pesticide residues in the raw water sources feeding Elvington and Loftsome Bridge water treatment works. Steps to be taken involve optimising treatment where possible and additionally to liaise with the Environment Agency, farmers, agronomists and other stakeholders to minimise inputs of this substance into the catchments serving our treatment works. The target is to secure compliance for both parameters by 31 March ) Notice YKS 3261 in relation to Total Coliforms, E.coli, Other faecal indicators and compliance with Regulation 26 from Cowick water treatment works. Implement enhanced monitoring strategy including all parameters identified as a risk to wholesomeness in the water supplied from Cowick water treatment works and carry out installation of UV disinfection system to be implemented by 30 April ) Notice YKS 3262 in relation to Total Coliforms, E.coli, Other faecal indicators and compliance with Regulation 26 from Heck water treatment works. The company has implemented an enhanced monitoring strategy including all parameters identified as a risk to wholesomeness in the water supplied from Heck water treatment works and will carry out installation of UV disinfection system, to be implemented by 30 April Information & Regulation July 2017 Page 1 of 7 1 st January st December 2016

2 Progress to date with work required 1) Scheme progressing according to project plan. 2) Scheme progressing according to project plan. 3) Scheme progressing according to project plan. Information & Regulation July 2017 Page 2 of 7 1 st January st December 2016

3 The geographical area covered by this Water Supply Zone is shown below: (Ody) COPYRIGHT STATEMENTS: Based upon Ordnance Survey map data with the permission of the Controller of Her Majesty's Stationery Office, (c) Crown Copyright. Licence No Copyright for additional WSZ boundary data shown on this map rests with Yorkshire Water. Information & Regulation July 2017 Page 3 of 7 1 st January st December 2016

4 Colony Counts After 3 Days At 22øc - no'/ml % % Colony Counts After 48 Hours At 37øc - no'/ml % % E. coli 0 no'/100 ml % % Enterococci 0 no'/100 ml % % Residual Disinfectant - Free - mg/l % % Residual Disinfectant - Total - mg/l % % Total coliforms(indicator) 0 no'/100 ml % % ,2 Dichloroethane 3 µg/l % % < 0.07 < 0.1 < 0.07 Aluminium 200 µg Al/l % % < 3.21 < Ammonium(ammonia and ammonium ions) 0.5 mg NH4/l % % < < Antimony 5 µg Sb/l % % Arsenic 10 µg As/l % % Benzene 1 µg/l % % < 0.02 < 0.02 < 0.02 Benzo 3,4 pyrene 0.01 ug/l % % < < < Boron 1 mg B/l % % Bromate 10 µg BrO3/l % % Cadmium 5 µg Cd/l % % < < Chloride 250 mg Cl/l % % Chromium 50 µg Cr/l % % Colour 20 mg/l Pt/Co scale % % < 0.5 < Conductivity 2500 µs/cm % % Copper 2 mg Cu/l % % Cyanide 50 µg CN/l % % < 0.7 < 0.7 < 0.7 Fluoride 1.5 mg F/l % % Gross Alpha Activity 0.1 Bq/l % % < < Gross Beta Activity 1 Bq/l % % Hydrogen Ion (ph) ph value % % Iron 200 µg Fe/l % % < 1.73 < Lead 10 µg/l % % < 0.03 < Manganese 50 µg Mn/l % % Mercury 1 µg Hg/l % % < 0.02 < < 0.05 Nickel 20 µg Ni/l % % Information & Regulation July 2017 Page 4 of 7 1 st January st December 2016

5 Nitrate 50 mg NO3/l % % Nitrite - Consumer's Taps 0.5 mg/l NO % % < < Nitrite/ Nitrate formula 1 mg/l % % < 0.37 < Odour 0 dilution number % % Polycyclic Aromatic Hydrocarbons (PAHs) 0.1 µg/l % % Selenium 10 µg Se/l % % Sodium 200 mg Na/l % % Sulphate 250 mg SO4/l % % Taste 0 dilution number % % Tetrachloroethene/Trichlorethene - Sum 10 µg/l % % Tetrachloromethane 3 µg/l % % < 0.02 < 0.02 < 0.02 Total organic carbon - mg C/l % % Total Trihalomethanes (THM's) 100 µg/l % % Turbidity 4 NTU % % < 0.03 < Calcium - mg Ca/l % % Magnesium - mg Mg/l % % Total Hardness - mg Ca/l % % ,4,5-T 0.1 µg/l % % < < < ,4-D 0.1 µg/l % % < < < ,4-DB 0.1 µg/l % % < < < Aldrin 0.03 µg/l % % < < < Atrazine 0.1 µg/l % % Bentazone 0.1 µg/l % % < < Bromacil 0.1 µg/l % % < < < Bromoxynil 0.1 µg/l % % < < < Carbetamide 0.1 µg/l % % < < Chlorpropham 0.1 µg/l % % < < < Chlorpyrifos 0.1 µg/l % % < < < Chlortoluron 0.1 µg/l % % < < < Clomazone 0.1 µg/l % % < < < Clopyralid 0.1 µg/l % % < < Cyanazine 0.1 µg/l % % < < < Cypermethrin 0.1 µg/l % % < < < Information & Regulation July 2017 Page 5 of 7 1 st January st December 2016

6 Cyproconazole 0.1 µg/l % % < < Diazinon 0.1 µg/l % % < < < Dicamba 0.1 µg/l % % < < < Dichlobenil 0.1 µg/l % % < < < Dichlorprop 0.1 µg/l % % < < < Dieldrin 0.03 µg/l % % < < < Difenconazole 0.1 µg/l % % < < < Diflufenican 0.1 µg/l % % < < < Diuron 0.1 µg/l % % < < < Epoxiconazole 0.1 µg/l % % < < < EPTC 0.1 µg/l % % < < < Fluazifop-butyl 0.1 µg/l % % < < Flufenacet 0.1 µg/l % % < < Fluroxypyr 0.1 µg/l % % < < Flurtamone 0.1 µg/l % % < < < Flusilazole 0.1 µg/l % % < < < Flutriafol 0.1 µg/l % % < < < Gamma-HCH (Lindane) 0.1 µg/l % % < < Heptachlor 0.03 µg/l % % < < < Heptachlor epoxide 0.03 µg/l % % < < < Imazapyr 0.1 µg/l % % < < < Ioxynil 0.1 µg/l % % < < < Isoproturon 0.1 µg/l % % < < < Linuron 0.1 µg/l % % < < < MCPA 0.1 µg/l % % < < Mecoprop-P 0.1 µg/l % % < < Metaldehyde 0.1 µg/l % % < < Metazachlor 0.1 µg/l % % < < Monuron 0.1 µg/l % % < < < op'-ddd (TDE) 0.1 µg/l % % < < < op'-dde 0.1 µg/l % % < < < op'-ddt 0.1 µg/l % % < < < Oxadixyl 0.1 µg/l % % < < < Pendimethalin 0.1 µg/l % % < < < Information & Regulation July 2017 Page 6 of 7 1 st January st December 2016

7 Notes: Pesticides - Total Substances 0.5 µg/l % % pp'-ddd (TDE) 0.1 µg/l % % < < < pp'-dde 0.1 µg/l % % < < < pp'-ddt 0.1 µg/l % % < < < Propachlor 0.1 µg/l % % < < < Propham 0.1 µg/l % % < < < Propiconazole 0.1 µg/l % % < < < Propyzamide 0.1 µg/l % % < < Prosulfocarb 0.1 µg/l % % < < < Quinmerac 0.1 µg/l % % < < Simazine 0.1 µg/l % % < < < Tri-allate 0.1 µg/l % % < < < Trichlopyr 0.1 µg/l % % < < < Trietazine 0.1 µg/l % % < < < ) Qualified values are taken at face value in all calculations. Information & Regulation July 2017 Page 7 of 7 1 st January st December 2016