Planning is very important. Just refer to the RIGHT EXPERTS to get the RIGHT ADVIISE. Small oil spill affects million of people. How much we charge them? They will repeat again and we have a prblems again. Never ending case.

http://www.thestar.com.my/News/Nation/2013/08/31/Code-Red-after-diesel-spill-A-million-in-Klang-Valley-to-go-without-water-maybe-for-days.aspx

Over one million consumers in seven districts will be affected by water disruption due to the closure of the Sungai Selangor Phase 1, 2 and 3 and Rantau Panjang treatment plants to facilitate clean-up works.

The current treated water reserve at the four plants can only last for a day.
The four plants produce 2.67 billion litres of water daily, catering to 57% of water demand in Selangor, Kuala Lumpur and Putrajaya.
Districts affected are Petaling, Kuala Lumpur, Klang/Shah Alam, Gombak, Hulu Selangor, Kuala Langat and Kuala Selangor.