Water Supply Industry Interpretations and Advice

Index

Area of Interest Reference Topic Title

Backflow prevention

B01

Risk assessment

Laboratories – risk of contamination by backflow

Backflow prevention

B02

RPZ Valves

RPZ valves - record keeping

Backflow prevention

B03

Emergency supplies

Renal Dialysis units – emergency water supplies to hospitals

Backflow prevention

B04

Fluid category

Steam ovens – catering equipment

Backflow prevention

B05

Fluid category

Dry cleaning machines

Backflow prevention

B06

Fluid category

Backflow risk in dog and cat kennels

Backflow prevention

B07

Fluid category

Pressure washers

Backflow prevention

B08

Fluid category

Non-domestic hose union taps and use of Fluid Category 5 categorisation

Backflow prevention

B09

Filling loops

Rapid filling of heating and cooling systems in non-domestic premises

Backflow prevention

B10

Fluid category

Washbasins in hairdressing saloons.

Backflow prevention

B11

Temporary supplies

Dosing equipment - temporary connection under the provision of Regulation 2(2).

Backflow prevention

B12

Fluid category

Flushing water systems prior to commissioning

Backflow prevention

B13

Fluid category

Swimming pools in domestic and non-domestic premises and hose union taps

Backflow prevention

B14

Fluid category

Baths – residential care accommodation

Backflow prevention

B15

Fluid category

Fence-cleaning chemical spray equipment directly connected to mains

Backflow prevention

B16

Maintaining supplies

Cross connections - permissible arrangements

Backflow prevention

B17

Fluid category

Dishwashing machines in small nursing homes

Backflow prevention

B18

Fire sprinklers

Fire sprinkler systems – backflow protection of domestic water supplies

Backflow prevention

B19

Maintaining an air gap

Pre-rinse spray units for catering use

Backflow prevention

B20

Flexible hoses

Restraining rings for backflow protection of flexible shower hoses

Backflow prevention

B21

Flexible hoses

Flexible hoses used in catering premises for vegetable preparation

Backflow prevention

B22

Water heaters

Filling and topping up heating system primary circuits.

Backflow prevention

B23

Backflow protection

Temporary water supplies to agricultural shows and festivals etc.

Backflow prevention

B24

Fluid category

Glass washers

Backflow prevention

B25

Fluid category

Cement batching plant

Backflow prevention

B26

Secondary backflow protection

Secondary backflow protection for Caravan and residential park homes

Backflow prevention

B27

Backflow protection

Backflow protection for water supplies to construction sites

Backflow prevention

B28

Fluid category

Backflow risk assessment for allotment hose union taps:

Backflow prevention

B29

Fluid category

Backflow protection for hydrants or washouts

Backflow prevention

B30

Fluid category

Hose union taps used in bin stores

Backflow prevention

B31

Fluid category

Compost irrigation in wormeries

Backflow prevention

B32

Whole site and zone backflow prevention

Verifiable check valves installed below ground

Backflow prevention

B33

Fluid category

Baptism pools

Backflow prevention

B34

Fluid category

Taps incorporating a pull out spray

Backflow prevention

B35

Fluid category

Acceptability of two single check valves in place of a double check valve

Backflow prevention

B37

Fluid category

Baths for assisted bathing of the disabled

Backflow prevention

B38

Fluid category

Backflow protection requirements for reverse osmosis units

Backflow prevention

B39

Type DC arrangements

Alignment of the installation requirements for Type DC arrangements

Backflow prevention

B40

Fluid category

Humidifiers

Backflow prevention

B41

Type DC and air break to drain

Use of Type DC arrangements and air break to drains in laboratories

Backflow prevention

B42

Back flow protection

Backflow protection for storage cisterns water storing wholesome water

Backflow prevention

B43

Fluid category

Back up supplies for grey water systems

Backflow prevention

B44

Fluid category

Spa, floatation and whirlpool baths

Backflow prevention

B45

Fluid category

Hose union taps used in connection with spa, floatation and whirlpool baths

Backflow prevention

B46

Fluid category

Fire station fire hydrants

Backflow prevention

B47

Fluid category

Retractable hoses on catering steaming ovens

Backflow prevention

B48

Fluid category

Domestic appliances which comply with BS EN 61770

Backflow prevention

B49

Fluid category

Storage cisterns supplying both laboratory taps and wash hand basins

Backflow prevention

B50

Zone protection

Zone protection in hotels and student accommodation

Backflow prevention

B51

Type DB arrangements

Alignment of the installation requirements for Type DB arrangements

Backflow prevention

B53

Backflow risk of shower hoses

Demarcation between a fluid category 3 and fluid category 5 zone of risk in a bathroom

Backflow prevention

B54

Temporary filling loops

Disconnection of temporary filling loops

Disputes

D01

Resolving disputes

Advice on disputes and arbitration

Enforcement

E01

Scope of the Regulations/Byelaws

Systems conveying both mains water and water from an alternative source

Enforcement

E02

Scope of the Regulations/Byelaws

Contractor’s liability

Installation

I01

Stopcocks

Need for boundary stopcocks

Installation

I02

Preventing cross connection

Inappropriate use of blue coloured pipe

Installation

I03

Pressure testing

Plastics pipes - test requirements.

Installation

I04

Stop valves

Stop valves – for two or more premises with common supply or distributing pipes

Installation

I05

Pipes

Location of pipes under solid floors

Installation

I06

Contamination

Ban on lead-based solder – declaration from developer/installer

Installation

I07

Water heaters - expansion water

Isolation valves in expansion vessel pipework.

Installation

I08

Pipes

Colour coding of supply pipes

Installation

I09

Water heaters - expansion water

Mains fed water storage heaters of 15 litres or less.

Installation

I10

Fittings

Continued use of fittings lawfully installed under the former Water Supply Byelaws.

Installation

I11

Accessibility of pipework

Accessibility of supply pipes passing through premises in multi-occupancy.

Installation

I12

Stop valves

Provision and location of common or separate supply stop valves in buildings

Installation

I13

Servicing valves

Hose union taps considered as service valves

Installation

I14

Discharge pipes

Discharges from condensing boilers

Installation

I15

Insulation

Frost protection for the supply pipe systems to, and on, allotments

Installation

I16

Overflow arrangements

Requirements for an overflow for a cistern supplied via a float valve

Installation

I18

Surge arrestor

Deadlegs as surge arrestors

Installation

I19

Pipework

Proximity of plastic supply pipes, sewers and drains

Installation

I20

Expansion vessels

Installation of expansion vessels

Installation

I21

Dead leg

Dead legs

Installation

I22

Supply pressure

Maximum and minimum supply pressure

Installation

I23

Accessibility

Accessibility of operational fittings

Installation

I24

DZR

Clarification of DZR requirement for closed circuits

Installation

I25

Lead pipe

Repairing lead pipe

Installation

I26

Pipework

Supplies in cemeteries & graveyards

Installation

I27

Pipes

Acceptability of pipe complying with WIS 4-32-19

Installation

I28

Utility pipes

Relative positioning of utility service

Installation

I29

Supply pipe

Re-using an existing supply pipe

Installation

I31

Irrigation systems

Guidance for installers of irrigation systems

Installation

I32

Safety valve discharge

Safety valves discharge arrangements for multiple systems

Installation

I33

Copper pipe

Installation of copper pipe below ground

Installation

I34

Copper

Equivalent of Table X, Table Y and Table W copper tube

Installation

I35

Pressure testing

BS EN 806: pressure testing requirements

Installation

I36

Towel radiators

Acceptability of towel radiators connected to the domestic hot water system

Installation

I37

Stop valves

Screwdriver operated spherical valves

Installation / Water Quality

IWQ01

Disinfection of pipework

Time elapsed before re-disinfection

Non-compliance

NC01

Crown immunity

Application of the regulations to premises previously covered by Crown immunity

Non-compliance

NC02

Timescale for improvements

Proportionality and timescales in requiring compliance

Notification

N01

Fire sprinklers

Fire sprinkler systems - adequate water supply

Notification

N02

Details of notifiable work

Notification of alterations – exemption for minor work

Notification

N03

Approved Contractors

Approved Contractors exemption from Notification and Compliance Certificates.

Relaxations

R01

Consistency

Seeking national Water Supply Industry support

Requirements for Water Fittings

RWF1

Interruption to water supply

Electric water heaters - continuity of supply

Use of water

UW01

Fire sprinklers

Provision of water for fire sprinkler systems in domestic premises

Water Quality

WQ01

Preventing contamination

Standpipes

Water Quality

WQ02

Preventing contamination

Taste of TCP from flexible hoses

Water Quality

WQ03

Maintaining wholesomeness

Chemical dosing equipment for maintaining water quality

Water Quality

WQ04

Pressure testing and disinfection

Changing premises from private water supplies to public supplies

Water Quality

WQ05

Liability

Dosing equipment - responsibility

Water Quality

WQ06

Contamination

Preventing stagnation in a fire sprinkler system

Water Quality

WQ07

Responsibility for Water Quality

Water supplies to dental chairs

Water Quality

WQ08

Maintaining wholesomeness

Use of petroleum tapes for wrapping pipes and fittings

Water Quality

WQ09

Responsibility for Water Quality

Children’s play equipment that uses water

Water Quality

WQ10

Disinfection

Disinfection requirements for caravans

Water Quality

WQ11

Fluid category

Safety showers and eye wash baths

WCs

WC01

Warning pipes

Internal warning pipes (overflows)

WCs

WC02

Warning pipe

WC cisterns - inappropriate use

WCs

WC03

Flushing performance

WC pans - on site test of flushing effectiveness