We also work very closely with our customers, Town Council and Building Maintenance Team to ensure that the water is fit for potable use within WHO guidelines. Alkalinity is a measure of the capacity of the water to resists a change in pH that would tend to make the water … It is often considered best to test pH on site. The pH level of tap water depends on where that water is coming from. here [PDF]. Temperature will also affect the equilibria and the pH. Feedback on discoloured water will be investigated thoroughly to establish the cause and ensure that PUB’s water supply is clean and clear. This may be caused by essential maintenance operations such as the routine cleaning of water tanks, flushing of service pipes in buildings and testing of fire hydrants. The quality of our drinking water is regulated by the Environmental Public Health (EPH) (Water Suitable for Drinking) (No.2) Regulations 2019. Over 500,000 tests are conducted annually on physical, organic, inorganic, radiological and microbiological parameters. +'?ID={ItemId}&List={ListId}', 'center:1;dialogHeight:500px;dialogWidth:500px;resizable:yes;status:no;location:no;menubar:no;help:no', function GotoPageAfterClose(pageid){if(pageid == 'hold') {STSNavigate(unescape(decodeURI('{SiteUrl}'))+ '/_layouts/15/hold.aspx' These can contaminate the water and make it unsafe for human consumption. However, this can change as it passes through the network of water mains and reservoirs. What does PUB do to resolve an incident of discoloured water? These can contaminate the water and make it unsafe for human consumption. '/_layouts/15/expirationconfig.aspx' The pH of most raw water lies within the range 6.5–8.5 (1). Corrosion of iron tank and other components in storage type hot water heater possibly due to end of service life or quality issues, Stagnant water in service pipes and water service installations from infrequent use (i.e. Surface waters typically range from pH 6.5 to 8.5, while groundwater ranges from pH 6 to 8.5. In addition, PUB send out an annual circular to Town Council, Management Corporation Strata Titles (MCSTs) and building owners of their responsibility to ensure the proper security and maintenance of their water service installations including their potable water storage tanks. The pH of water is a measure of the acid–base equilibrium and, in most natural waters, is controlled by the carbon dioxide–bicarbonate–carbonate equilibrium system. What Is The PH Scale? This helps to minimise discoloured water incidents. An increased carbon dioxide concentration will therefore lower pH, whereas a decrease will cause it to rise. Singapore's tap water comes from four sources known as the Four National Taps: Water from Local Catchment, Imported Water, NEWater and Desalinated Water. It makes sense to measure pH in water solutions; liquids such as mineral oil or turpentine don't have a pH. WhenThe tap water is monitored continuously throughout the year. What is PUB doing to prevent future incidents from occurring? Does PUB attend to every case of discoloured water? In more serious cases, water wagons will be deployed. PUB has established a comprehensive and robust sampling and monitoring programme to ensure our water quality from source to tap. Online sensors also monitor water quality at each stage of the treatment process and service reservoirs. Depending on our findings, we will conduct emergency pipeline operations and isolate the source to prevent further discolouration. To clear brownish water from PUB’s water mains, our officers will flush the water containing re-suspended mineral sediments out from the water mains in a controlled manner until the water clears up. Customers should also frequently check that their appliances are in good working condition and replace them when there are signs of corrosion or when it has passed its service life stipulated by the supplier. '/_layouts/15/itemexpiration.aspx' The pH value can vary from 0 to 14. The pH of a solution is a measure of the concentration of hydrogen ions. The quality of our drinking water is regulated by the Environmental Public Health (EPH) (Water Suitable for Drinking) (No.2) Regulations 2019. The drinking water standards set out under the EPH Regulations were based on the WHO Guidelines for Drinking-water Quality. Customers could also play their part by paying attention to their service pipes and appliances and ensure they are in good working condition. If the water has not cleared up after 10 to 15 minutes, customers can call PUB’s hotline at 1800-CALL-PUB for assistance with their water supply. Solutions with a pH between 0 and 7 are acidic, while those with a pH between 7 and 14 are basic. The first thing that customers can do is to run their taps and flush any water tanks inside their premises until the water runs clear. Is discoloured water safe for drinking? In pure water, a decrease in pH of about 0.45 occurs as the temperature is raised by 25 °C. Our tap water is monitored continuously throughout the year. +'?ID={ItemId}&List={ListId}'); return false;} if(pageid == 'audit') {STSNavigate(unescape(decodeURI('{SiteUrl}'))+ + '?List={ListId}&ID={ItemId}'), /_layouts/15/images/sendOtherLoc.gif?rev=23, javascript:GoToPage('{SiteUrl}' + Customers should also try to determine the source of the discoloured water. What should customers do when they encounter discoloured water? We also engage the Town Councils and SCDF regularly to ensure that their maintenance operations are conducted with care to minimise discoloured water incidents. Water, in its purest form, has a PH level of exactly 7, and this provides the foundation for measuring pH levels. Drinking water is normally clear but very occasionally may appear discoloured or contain particles.

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