Maintaining Water Quality... (1) at temporary events (2) and Private Distribution Networks Garry...

Maintaining Water Quality ...(1) at temporary events

(2) and Private Distribution Networks

Garry BoormanGarry BoormanPrincipal Advisor, Public Health & StandardsPrincipal Advisor, Public Health & Standards

Ian MitchellIan MitchellWater Regulations & Monitoring ManagerWater Regulations & Monitoring Manager

Where to start ...

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

Waste ...

Water escaping from defective pipes or fittings above or below ground whether seen or not seen.

Misuse ...

Water used for any other purpose than that for which it was legally supplied.

Undue consumption ...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)

Erroneous measurement...

By-passing a water meter.

Contamination ...The possible contamination of an internal or external

water supply.

Risk Assessment...

Backflow by• backsiphonage• back pressure

Decide • level of risk (fluid category)• check for appropriate backflow device

Backflow Risk – Fluid Categories

Backflow Risk – Fluid Category 1

Fluid Category 1 – Wholesome water, no backflow protection needed.


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.


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.


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.


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

Contamination - Agricultural

Live animal in drinking trough (submerged ball valve)

Contamination - IndustrialCross connection causing contamination by industrial /

horticultural fluids

Spot the contravention ...

Failure to comply ...

What went wrong?

Approved Materials

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 DocumentGuidelines for the Provision of Temporary Drinking Water Supplies at EventsWater Health Partnership for Wales


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

o additional costs

o notice and prosecution

o high risk of an outbreak (campylobacter / E.coli O157)

o civil action if anyone becomes ill

o loss of reputation and public reluctance to attend future events

o poor media coverage


Event organisers must contact local authority Environmental Health and local Water Company if a public water supply connection is needed

o 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

o 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


Event organisers must ...

o 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


Event organisers must ...o 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


Commissioning of the water supply

o 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 by

appropriately trained and certified personnel

• check microbiological samples required

• formal ‘Certificate of Disinfection’ provided to local authority

/ water company


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


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


During the Event

Environmental Health Officers may undertake inspections and sample during the event


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


Guidance from DWI – 25th April 2013

http://dwi.defra.gov.uk/stakeholders/guidance-and-codes-of-practice/

2013 Private Distribution Systems


Guidance from DWI – 25th April 2013


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 occupying

individual 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 ...

Where to end ...

Temporary 25mm MDPE overland supply pipe. Installed following failure of private supply source.

Alternative supply pipework (Spring Water) now disconnected

Where to end ...

Where to end ...

Cattle trough with type ‘AA’ air gap

Where to end ...

25mm MDPE pipe. Open ended pipe with no backflow protection

Animal Faeces

Where to end ...

Outside hose union bib taps with no backflow protection

Where to end ...

Post UV sample point – samples ‘failed’

Pre UV sample point – samples ‘passed’

UV Disinfection Equipment

Contacts

For any queries regarding Water Fittings Inspections

• e-mail ‘[email protected]’• phone 01332 683711

Or• [email protected]

For any queries regarding temporary supplies or private distribution networks

• [email protected]

Thank You for Listening

Maintaining Water Quality... (1) at temporary events (2) and Private Distribution Networks Garry...

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