Download
1 / 56
570 likes | 774 Views
Maintaining Water Quality ... (1) at temporary events (2) and Private Distribution Networks. Garry Boorman Principal Advisor, Public Health & Standards. Ian Mitchell Water Regulations & Monitoring Manager. Where to start. Where to start. Where to start.
E N D
Maintaining Water Quality ...(1) at temporary events(2) and Private Distribution Networks Garry Boorman Principal Advisor, Public Health & Standards Ian Mitchell Water Regulations & Monitoring Manager
The Water Supply (Water Fittings) Regulations 1999 Replaced Water Byelaws Made 1st April 1999 Laid before parliament 14th April 1999 Enforceable 1st July 1999 Section 74 Water Industry Act 1991 Water Industry Guide – guidance to schedule 2 of the Regulations (requirements for Water Fittings) Regulations are there to provide protection for the water supply from waste; misuse; undue consumption; erroneous measurement and most importantly contamination
Water escaping from defective pipes or fittings above or below ground whether seen or not seen. Waste ...
Water used for any other purpose than that for which it was legally supplied. Misuse ...
Water used in excess of the quantity required for a specific purpose. (Jan 2001 20% reduction of the amount of water used for flushing new toilets) Undue consumption ...
By-passing a water meter. Erroneous measurement...
The possible contamination of an internal or external water supply. Contamination ...
Backflow by • backsiphonage • back pressure • Decide • level of risk (fluid category) • check for appropriate backflow device Risk Assessment...
Fluid Category 1 – Wholesome water, no backflow protection needed. Backflow Risk – Fluid Category 1
Backflow Risk – Fluid Category 2 • Fluid Category 2 – Aesthetic deterioration • Examples: • Mixing of hot and cold water supplies • Stagnant water in redundant pipe work • Ice making machines • Domestic water softeners • Install - Single check valve fitted.
Backflow Risk – Fluid Category 3 • Fluid Category 3 – Slight health risk • Examples: • Water in domestic central heating systems • Domestic wash hand basins / baths • Domestic hose union taps • Domestic washing & dishwasher machines • Install - Double check valve fitted.
Backflow Risk – Fluid Category 4 • Fluid Category 4 – Significant health risk • Examples: • Water in non-domestic central heating systems • Printing and Photographic equipment • Commercial dishwashing equipment • Fire sprinkler systems using anti-freeze • Install - Reduced Pressure Zone Valve.
Backflow Risk – Fluid Category 5 • Fluid Category 5 – Serious health risk • Examples: • Grey / Rain water harvesting systems • Slaughter house equipment • Cattle drinking troughs • WC pans, urinals and bidets • Install – Storage cistern with AA / AB air gap.
Contamination - Domestic Dead animals in cold water tank
Live animal in drinking trough (submerged ball valve) Contamination - Agricultural
Cross connection causing contamination by industrial / horticultural fluids Contamination - Industrial
Temporary Drinking Water Supplies It is suggested that guidance is made available to organisers of events where a temporary drinking water supply is required so that there is an understanding of the risks associated with supplying drinking water. Reference Document Guidelines for the Provision of Temporary Drinking Water Supplies at Events Water Health Partnership for Wales
Temporary Drinking Water Supplies • It is suggested that guidance is made available to organisers of events • where a temporary drinking water supply is required so that there is an understanding of the risks associated with supplying drinking water. • Failure to properly plan for the provision of a safe source of drinking watercan have significant consequences with the organisers • additional costs • notice and prosecution • high risk of an outbreak (campylobacter / E.coli O157) • civil action if anyone becomes ill • loss of reputation and public reluctance to attend future events • poor media coverage
Temporary Drinking Water Supplies • Event organisers must contact local authority Environmental Health and • local Water Company if a public water supply connection is needed • in advance of the event at the earliest opportunity • if new connection required at least 12 (20) weeks notice • to existing connection at least 4 (8) weeks notice • submit plans • to show distribution network and infrastructure • direction of flow • location of pumps, incoming supply, toilet blocks, drinking water points, water for food preparation areas,treatment and sampling points etc
Temporary Drinking Water Supplies • Event organisers must ... • undertake a risk assessment on water supply arrangements • identify potential risks that may cause contamination or aninsufficient water supply • the measures to be taken to control / prevent these • the checks & monitoring procedures to ensure control measures are in place • the actions to be taken should the control measures fail
Temporary Drinking Water Supplies • Event organisers must ... • document their emergency operating plan for dealing with contamination or failure of water supply • close the event • contingency for emergency water supplies • Organisers cannot rely on emergency supplies being provided by the local authority or water company • Suggest that the event ‘Water Safety Plan’ is submitted to the local Environmental Health department at least 14 days in advance of the event
Temporary Drinking Water Supplies • Commissioning of the water supply • storage and disinfection of distribution pipe-work • prior to use drained, stored off ground & end capped • segregated from fuel oils / contaminants • pipe material to be of approved materials (Regulation 31 Water Supply (Water Quality Regulations 2010) • laying, preparation & disinfection to be undertaken byappropriately trained and certified personnel • check microbiological samples required • formal ‘Certificate of Disinfection’ provided to local authority / water company
Temporary Drinking Water Supplies • Water provision via tankers or bottled water • The following British Standard has been issued to provideguidance on provision of safe drinking water to events wheretankers or bottled water are used • BS8551:2011 Provision and management of temporary watersupplies and distribution networks (not including provisions forstatutory emergencies) – Code of Practice • Event organisers are strongly recommended to obtain a copy
Temporary Drinking Water Supplies • Prevention of Contamination • Event organisers must also ensure that the fixtures and fittingsconnected to the distribution pipe-work do not contaminate the water supply. • Any connections made to the public water supply must complywith The Water Supply (Water Fittings) Regulations 1999 • Guidance to regulations available via WRAS(http://www.wras.co.uk/Regulations_guide.htm) • Connections to public water supply must have backflow protection.Water Company Water Regulations Inspector may visit the site tocheck for compliance
Temporary Drinking Water Supplies • During the Event • Environmental Health Officers may undertake inspections and sample during the event
Temporary Drinking Water Supplies • Further Recommendations of Good Practice • Do operational personnel hold valid National Water Hygiene cards? • Distribution pipe-work must not have been used for any other purpose • Locate any existing buried sewer, water pipes or electricity cables • Ensure that access to any water storage is controlled and restricted to unauthorised people • Consider location of fuel / paint stores (bunded?) • If event in warm weather consider need to insulate water pipes • Label taps suitable for drinking water • Monitor chlorine residuals • If overland pipes used are these adequately protected from damage • Undertake regular inspections of drinking water taps to ensurethey remain hygienic
Private Distribution Networks • Definitions • Distribution SystemArrangement of assets (pipes, tanks, pumps) that convey a supplyof wholesome water • Boundary / Bulk MeterThis is the end point of the public network. The point at which a thirdparty takes accountability for conveying a wholesome supply • Private Onward Distribution SystemTerm used to describe a privately owned arrangement of assets used to deliver water to other premises. The PODS will be supplied via a Water Undertaker or Combined Licensee. The end of the public supply is defined by a bulk meter or tank
Private Distribution Networks Guidance from DWI – 25th April 2013 http://dwi.defra.gov.uk/stakeholders/guidance-and-codes-of-practice/ 2013 Private Distribution Systems
Private Distribution Networks Guidance from DWI – 25th April 2013
Private Distribution Networks • Examples of issues unlikely to be a Regulation 8 supply • caravan sites where there is a single owner of whole site • small industrial parks with several different businesses occupyingindividual units on one premises • hotel premises with outbuildings / marquee used for temporary events • airports / ports with single owner of whole site • university / college / school with single owner of whole site • rural estate where all buildings / homes are in the management or ownership of the estate • The Water Company is responsible for monitoring and enforcingthe Water Fittings Regulations 1999
Where to end ... Alternative supply pipework (Spring Water) now disconnected Temporary 25mm MDPE overland supply pipe. Installed following failure of private supply source.
