In line with one of the primary national objectives in the expansion of sustainable drinking water facilities for the nation, the decision was taken to establish Western Province Regional Support Centre in the year 1992. Later it was decided to decentralize the NWSDB operation of the Western Province into three functional areas and as a result, the Regional Support Centre (Western-South) was established in the present form in the year 2008. As the main body in the region, the primary objective was in providing safe sustainable drinking water with improved sanitation facilities to residents and to improve the safety and hygiene of women and children in the area by providing safe drinking water facilities to their households.

The geographical area covered under Western-South Regional Support Centre are Dehiwala , Moratuwa & Ratmalana DS divisions and some parts of Homagama DS Division in the Colombo District, and all DS divisions in the Kalutara district and a part of Bentota DS division in the Galle district.This region lies in the wet zone and the annual rainfall varies from 2500 - 3000mm and the annual average temperature varies between 22ºC to 35ºC throughout the year. The geographical area covered by this region is 2250 square km and the population is 1.7 Million as per the 2012 Census Data. This Region has undergone changes with human influence for a long period of time resulting in the conversion of natural habitats to man-made habitats such as economical, tourist attracted landscapes, and paddy fields etc.

Western South Regional Support Centre is headed by Deputy General Manager & assisted by Assistant General Manager. The Operation and Maintenance (O&M) activities within the Western-South Regional Support Centreare divided into three regions namely Dehiwala, Panadura/Horana and Kalutara, where each region is headed by a Regional O&M Manager. Total staff within the Western South region is about 714 as at January 2020whose dedication to work has helped Regional Support Centre (Western-South) to be able to achieve National Productivity Awards ( Service Sector – Medium Scale ) in respect of years 2014, 2015 and 2018.

The Western-South Regional Support Centre provides safe pipe-born drinking water to people via 275,283 service connections as at January 2020. In addition to this, the community managed Rural Water Supply Schemes of the region contribute 4.5 % of safe pipe-born water supplied through ADB funded 137 Community Based Rural Water Supply Schemes for which close monitoring, capacity development and technical guidance as well as functioning facilities are provided through Rural Water Supply Sections of Kalutara Manager Office. Apart from this, 35 Nos. of recently established CBOS are in operation under the guidance of RWS Section of Kalutara Manager Office.

There are many medium scale water supply projects and transmission improvements which are ongoing at present. Further, many feasibility studies are in place and in progress for improvement to put them into practice and meet the future demand for pipe born water.

A well-functioning clustered laboratory system is in the region enabling Chemical and Bacteriological testing in accordance with updated SLS standards and among those laboratories Western South Regional Laboratory (Dehiwala / Panadura) has obtainedISO/IEC 17025 Laboratory Accreditation certification in 2019. This is the first Laboratory in the NWSDB which was accredited for Biological testing and recognized as one of the competency laboratories in Sri Lanka for potable water testing. This contributes to reduction in numbers of incidents of water borne diseases, which in turn benefits the population by upgrading their livelihood resulting in time and money saved as well as the benefits to the environment due to reduced water pollution.

Assuring the use of the best of breed of latest technologies to support the operation benefitting the customers thereby, modern Information and Communication Technology is applied as most effective tools in improving the operational efficiency, quality of service and productivity of the organization. Various steps to enhance the IT Infrastructure and Solutions to suit the needs of the organization have been taken keeping in pace with the latest trends in the industry. Some of these activities include On-line Bill Payment facility, Smart Zone for 24 hour service facilities, On-line Customer Grievance Handling Applications, use of Mobile App for Meter Reading, Drive-thru Bill Payment facility etc.

On the other hand, the NWSDB Western-South Regional Support Centre’s commercial contribution as a whole has generated Rs. 3,309 Million revenue in the year 2019, which is about 12% of the total revenue of the NWSBD.

Please click here to view / download contact list of officers of Regional Support Center (Western - South)

Please click here to view / download existing water supply coverage of Regional Support Centre (Western - South)

Please click here to view / download transmission line map of Regional Support Centre (Western - South)

Please click here to view / download organization structure of Regional Support Centre (Western - South)

As at end of No. of Connection
2006 127,435
2007 136,790
2008 148,036
2009 156,031
2010 163,211
2011 171,242
2012 182,202
2013 194,107
comparison of service connections ws

The quality of water being supplied is tested regularly. Click here for a summary of test results taken island-wide.

Schemes which are presently in operation

Region Scheme Total no. of connections as end of 30th December 2013 Average Monthly Production (m3/ month)
Dehiwala Region Dehiwala 52029 3120000
  Moratuwa 49924  
Kalutara Region Wadduwa 10515 173750
  Kalutara 14109 350000
  Bombuwala 1920 350000
  Payagala 7922 160000
  Beruwala 8367 195000
  Aluthgama 8741 190000
  Matugama 453 8000
Panadura - Horana Region Mawgama These schemes are now integrated with other Schemes
  Horana 5715 150000
  Bandaragama 6803 160000
  Keselwatte 31104 704000
  Ingiriya 1302 170000
Total 194107  

Ongoing Projects

Small and Medium Water Supply Projects
Project Name No. of Beneficiaries Total Cost Estimate (Rs. Million) Duration
From To
Kalutara Integrated Water Supply - Stage II Beruwala and Aluthgama Pipeline Improvements 120000 1,366.00 Jan 2011 Dec 2014
Distribution relating work under Galle road rehabilitation Project – RDA Fund RDA Fund   Jul 2013 Jun 2014
Large Scale Water Supply and Sanitation Projects
Project Name (Donor) No. of Beneficiaries Total Cost Estimate (Rs. Million) Duration
From To
Inter-District Projects
Aluthgama, Mathugama and Agalawaththa Integrated Water Supply Project 573,000 11,576.00 2013 2016

Please  click here to view / download full contact list for Regional Support Centre (Western - South)

Postal Address :

Regional Support Centre (Western - South)
National Water Supply & Drainage Board
No.07, Angulana station Road,
Sri Lanka.

Telephone :

+94 11 2224888

Fax : +94 11 2637945, +94 11 2637946, +94 11 2637947
Name & Designation Telephone Mobile E-mail

Eng. M.T.M.Razil
Deputy General Manager

+94 11 2224800 +94 77 7771212

This email address is being protected from spambots. You need JavaScript enabled to view it.
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Assistant General Manager

+94 11 2224801 +94 772240535 This email address is being protected from spambots. You need JavaScript enabled to view it.

Managers (Operational & Maintenance)

Name & Designation Telephone Fax Mobile E-mail
 Manager dehiwala

Eng.J.A.C Priyal
Responsive Areas: Dehiwala, Moratuwa

+94 11 2734444 +94 11 2734444 +94773795637 This email address is being protected from spambots. You need JavaScript enabled to view it.


 Eng. H.A.N. Hulanduwa Arachchi
(Panadura/ Horana)
Responsive Areas: Panadura, Bandaragama, Horana, Ingiriya

+94 38 5672187,
+94 38 2241856-7
+94 38 2241544 +94777392467 This email address is being protected from spambots. You need JavaScript enabled to view it.
 Kaluthara Manager

Eng. U.D.P.M. Gunasinghe

Responsive Areas: Kalutara, Beruwala, Wadduwa, Waskaduwa, Aluthgama, Matugama, Payagala

+94 34 5581497 +94 34 5581497


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Service Standard Indicators

Service Indicators  RSC (Western - South)
Dec 2013
Regional Average
Water Coverage (%) Pipe System maintained by NWSDB 53.1%
Per Capita Consumption (l/c/d) 132.4
Water Availability (hours) 24.0
Water Quality - Bacteriological Quality Compliance 100.0%
Water Quality - Bacteriological Testing Compliance 100.0%
Water Quality - All Samples Compliance 100.0%
Sewerage Coverage (%) 2.3%

Operational Indicators

Operational Indicators RSC (Western - South)
Dec 2013
Regional Average
Non-Revenue Water (%) 29.7%
Non-Revenue Water - m3/conn/day 0.23
Defective Meters per '000 connections 3
Operational Staff/ 1000 connection 3.7
Estimated Bills/ 1000 connections 6

Performance in Customer Service

Customer Service Indicators RSC (Western - South)
Dec 2013
Regional Average
Response to requests for new service connections (%) 95.0%
Customer Complaints Volume (Complaints/ 1000 connection) 146.2
Customer Complaints Resolution 100.0%

Key Performance Indicators (KPIs)

Financial KPIs RSC (Western - South)
Dec 2013
Regional Average
Collection Ratio (%) 102.0%
Accounts Receivable Period (months) 3.6
Collectable Accounts Receivable Period (months) 1.0
Operating Ratio 0.73
Average Tariff (LKR/ m3 Sold) 38.50
Stock Efficiency (LKR/ connection) 947