Schedule 1

Subject to sub‑paragraph (2), no material or substance which, either alone or in combination with any other water fitting, material or substance or with the contents of any water fitting of which it forms a part, causes or is likely to cause contamination of water shall be used in the construction, installation, renewal, repair or replacement of any water fitting which conveys or receives, or may convey or receive, or is intended to convey or receive piped water suitable for drinking.[S 153/2019 wef 25/03/2019](2) Sub‑paragraph (1) shall not apply to a water fitting downstream of a terminal fitting supplying piped water suitable for drinking where —

the use to which the water fitting downstream is put does not require piped water suitable for drinking; and

a suitable arrangement or an adequate device to prevent backflow is installed.[S 153/2019 wef 25/03/2019]2.—

Water fittings shall be made of material which is corrosion-resistant or shall be effectively protected from corrosion and deterioration.(2) No water fitting shall be made of material susceptible to permeation by any gas or any other substance which could cause contamination of the water in the pipe.(3) No water fitting shall be made of lead or lead alloy.

cause contamination of water supplied by the Board or piped water suitable for drinking supplied by an approved person, or contamination or damage to the water fitting; or[S 153/2019 wef 25/03/2019](b)is likely to cause contamination of water supplied by the Board or piped water suitable for drinking supplied by an approved person, or contamination or damage to the water fitting unless it is impracticable for the water fitting to be installed elsewhere and all necessary measures are taken to avoid any risk of contamination of the water supplied by the Board or piped water suitable for drinking supplied by an approved person, and contamination or damage to the water fitting.[S 153/2019 wef 25/03/2019]4. Pipes and pipe fittings which convey any fluid other than piped water suitable for drinking (excluding NEWater) shall be clearly identified so as to be easily distinguished from any service pipe or distributing pipe which conveys piped water suitable for drinking (excluding NEWater).[S 153/2019 wef 25/03/2019]5. Every concealed pipe shall be watertight and suitable for the default pressure and temperature likely to be encountered by the pipe in the place where it is concealed.

a distributing pipe;

a pump delivery pipe drawing water either from a distributing pipe or from a storage tank; or

the suction pipe of any pump.Storage tanks[S 164/2018 wef 01/04/2018]7. Every storage tank for storing piped water suitable for drinking (excluding NEWater) shall be watertight, of adequate strength, properly supported and shall be constructed of copper, glass reinforced polyester, concrete or other corrosion-resisting materials and shall not have any adverse effect on the quality of water contained therein.[S 153/2019 wef 25/03/2019]8. Every storage tank and any water fitting connected directly to it shall be free from distortion or damage.

Every storage tank shall be fitted with —

an overflow pipe which has a suitable means of warning of an impending overflow; and

a float-operated valve, an effective adjustable valve or any other effective device for controlling the inflow of water which —

is capable of shutting off the inflow of water at a suitable level below the overflowing level of the tank; and

which can be readily installed, repaired, renewed or adjusted.(2) Every storage tank shall be fitted with a servicing valve on the inlet pipe adjacent to the tank and a servicing valve on the outlet pipe.(3) Where 2 or more storage tanks at the same level are connected together, the pipe used to connect one tank to another shall be fitted with a stop-valve.[S 164/2018 wef 01/04/2018](4) Every inlet pipe to a storage tank, whether fitted with a float-operated valve or not shall be fitted in such a position that it discharges at a level higher than the overflowing level of the overflow pipe or, if there is more than one overflow pipe, the highest overflow pipe, by not less than the diameter of that overflow pipe, unless there is an effective means of preventing the siphonage of water back through the inlet.[S 164/2018 wef 01/04/2018]12. A storage tank receiving piped water suitable for drinking (excluding NEWater), and any other water, must have an air‑gap of not less than 150 millimetres between the inlet of the storage tank receiving the piped water suitable for drinking (excluding NEWater) and the top edge of the storage tank.[S 153/2019 wef 25/03/2019]13.—

The inspection manhole covers of a storage tank shall be close-fitted and hinged or chained to the tank.(2) The inspection manhole covers of a storage tank shall be properly closed, secured and locked.(3) The air vents and warning and overflow pipes of a storage tank shall be —

made of corrosion-resisting material;

integrated with the tank or otherwise fastened onto the tank with corrosion-resisting fasteners;

properly screened to prevent ingress of any animal or foreign material; and

easily visible and noticeable.

No storage tank shall be installed in such a position that —

it is directly below any sanitary pipe, floor trap, sewer pipe, reclaimed water pipe or waste pipe;

it is in danger of being flooded;

the water contained in it is contaminated or liable to contamination;

it is not readily accessible for the purposes of inspection, cleaning and maintenance;

it is unsightly if exposed to public view, unless it is not practicable to position or place the tank in any other place;

it is buried or sunk in the ground unless —

there is sufficient space around and beneath the storage tank for the purposes of maintenance and detection of leakage; and

the storage tank satisfies either of the following requirements:

it is a closed vessel with a tightly fitting access cover bolted or screwed in position, and with any air inlet and overflow pipe suitably screened; or

its inlet pipe discharges into the air no less than 150 millimetres above its top edge.(2) Sub-paragraph (1)(f)(i) shall not apply in relation to a concrete storage tank designed and constructed in accordance with Singapore Standard SS 636 : 2018 known as “Code of practice for water services” published by the Enterprise Singapore Board, as in force from time to time, and any other requirements of the Board.[S 164/2018 wef 01/04/2018][S 341/2020 wef 30/04/2020]Flushing cisterns and flush valves17.—

Subject to sub-paragraph (2), every water-closet pan and every urinal shall be provided with a flushing cistern or flush valve.[S 153/2019 wef 25/03/2019](2) Flush valves shall not be used in residential dwelling units.18.—

Every flushing cistern serving a water-closet pan must be of such a design, and be arranged, so as to give a dual flush of 2 different volumes such that —

the volume of the full flush does not exceed 4 litres; and

the volume of the reduced flush does not exceed 3 litres.(2) Every water-closet flush valve must be of such a design, and be arranged, so as to give a single flush of not more than 4 litres.[S 920/2021 wef 01/01/2022](3) Every urinal flush valve must be of such a design, and be arranged, so as to give a single flush of not more than one litre.[S 192/2019 wef 01/04/2019][S 920/2021 wef 01/01/2022]19. Every flushing cistern or flush valve shall be fitted with an adequate device or so constructed to prevent the backflow of water to any pipe conveying water supplied by the Board or piped water suitable for drinking supplied by an approved person.[S 153/2019 wef 25/03/2019]20. Every flushing cistern or flush valve connected directly or indirectly to any pipe conveying water supplied by the Board must be of a design that does not cause any wastage of water supplied by the Board.[S 153/2019 wef 25/03/2019][S 153/2019 wef 25/03/2019]