1.Before proceeding with the design of a proposed development, QP shall apply to CBPU for the following sewerage and drainage information related to the development site:

i.Sewerage Interpretation Plan (SIP) indicates the location and alignments of public sewers or pumping mains in the vicinity of the development.  The SIP may not show details of the existing sewer connections at the development.  QP should ascertain/verify details of the existing sewer connection on site;
ii.Drainage Interpretation Plan (DIP) indicates drainage reserves or land safeguarded for future drainage schemes.  The DIP may not show details of the common drain at the development.  QP should ascertain/verify details of the common drains on site; and the
iii.Minimum Platform Level (MPL) for effectual surface water drainage.

2.For additions and alterations to existing developments which do not involve an increase in the existing building coverage area, QP need not apply for SIP & DIP.

3.QP can apply for DIP/SIP on-line (Internet) and make payment using cash card or credit card. The fee charged is $20 for DIP and $20 per standard plan not exceeding A3 size for SIP via on-line (Internet) application. QP will need the following hardware and software to make CashCard purchases:
1. A NETS approved SmartCard reader.
2. A free e-Wallet software.

To apply DIP/SIP on-line, please click here. Please call Ms Oh Bee Wah at Tel : 67319628, Mr Chia Tiam Seng at 67319321 or Mr Lim Gee Hong at 67319630 if you need any clarification/assistance.  CBPU will process the application for SIP/DIP within 7 working days.

QP may apply for SIP/DIP by providing the following:

- The location of the development site (details such as Mukim No, Lot No. and address);
- A site plan showing the location of site if it is reclaimed land or has recently been subdivided/amalgamated; and
- An outline of the proposed development.

4.Upon receipt of SIP & DIP, QP shall conduct site surveys to verify the alignments and invert levels of the public sewers/pumping mains/sewer connections and drainage reserves/common drains.

5.QP shall also check if the development site is adjacent to MRT above ground tracks and existing factories.

6. For infrastructure projects (e.g. MRT/road tunnels, roadworks, MRT/road viaducts, etc.), QPs shall apply to CBPU for SIP/DIP for information on sewerage and drainage infrastructure. Thereafter, the QP shall submit their proposal to PUB(Water Reclamation Network Dept) and PUB(Catchment & Waterways Dept) for clearance. DC/BP/TOP/CSC clearances from CBPU is not required.  However, for MRT stations, depots, ventilation buildings/shafts, etc. QP shall obtain clearance from CBPU at the DC/BP/TOP/CSC stage.