Hi All,
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Dear Sir,
Thank you for your feedback.
The chlorine level in drinking water is being monitored on-line continuously at our waterworks pumping main and distribution networks. The close monitoring is to ensure sufficient residual to prevent bacteria re-growth as chlorine level will vary due to varying system demand and retention time.
The residual chlorine at customer taps is generally below 2 mg/l.
The measurement unit for water quality parameters are in mg/l unless otherwise stated. It is indicated at the top left column of the Potable Water Quality table below as "Chemical & Physical Characteristics (In mg/l where applicable)".
http://www.pub.gov.sg/general/waters...Treatment.aspx
Regards
PUB One Officer
for DIRECTOR
TECHNOLOGY & WATER QUALITY OFFICE
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