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 2021 whose 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 285,546 service connections as at January 2021. 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 obtained ISO/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.




RSC (W-S) Office Premises


Action Plan 2016-2020 / 2020-2025

According to the vision and mission of the NWSDB, the action plan is prepaired in every five year to achive the NWSDB goal. According to the NWSDB master Action Plan, all Regional Support Centers prepare their Regional Five Years Action Plan to achive the goal of NWSDB.

RSC (W-S) Five Year Action Plan

2016-2020  Gole 1 click here to view / download

2016-2020  Gole 2 click here to view / download

2016-2020  Gole 3 click here to view / download

2016-2020  Gole 4 click here to view / download

2020-2025 NWSDB Master Corporate  Plan click here to view / download

2020-2025 Corporate Plan of Kaluthra Region   click here to view / download

RSC (W-S) Annual Action Plan

2016  Annual Action Plan click here to view / download

2017 Annual Action Plan click here to view / download

2018 Annual Action Plan click here to view / download

2019 Annual Action Plan click here to view / download

2020 Annual Action Plan click here to view / download 

2021 Annual Procurement Plan click here to view / download


                                        Oraganization Chart




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 WSS Name


Total no. of Connections

 end of Jan 2021

 Dehiwala  63,806
 Moratuwa  49,269
WSS Name 


Total no. of Connections 

end of Jan 2021


Panadura 46,742
Bandaragama  19,644
Horana  15,938
Ingiriya 1,604
Kubuka 13,493
WSS Name 

 Total no. of Connections 

end of Jan 2021

Kaluthara 19,339
Wadduwa 18,183
Beruwala 11,612
Aluthgama 10,991
Bombuwala 3,730
Payagala 10,716
Mathugama 479




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As at end of No. of Connection
2006 127,435
2007 136,790
2008 148,036
2009 156,036
2010 163,211
2011 171,242
2012 182,202
2013 194,107
 2014  207,563
 2015  220,019
 2016  236,424
2017 252,902
2018 261,766
2019 274,329




Connection varariation



Schemes which are presently in operation


Region Scheme Total no. of Connections  end of Jan 2021 Average Monthly Consumption (m3/ month)
Dehiwala Region  Dehiwala 63,806 3,561,459
Moratuwa 49,269
Kalutara Region        Wadduwa 18,183 307,186
Kalutara 19,339 547,612
Bombuwala 3,730 69,055
Payagala 10,716 244,176
Beruwala 11,612 268,395
Aluthgama 10,991 179,942
Matugama 479 8,620
Panadura/Horana Region     Horana 15,938 329,686
Bandaragama 19,644 285,022
Keselwatte 46,742 1,102,909
Ingiriya 1,604 28,894
Kubuka 13,493 208,221
Total 285,546  7,141,177

Service Indicators 

At end of

January 2021

Regional Average
Water Coverage (%) Pipe System maintained by NWSDB 56.85%
Water Availability (hours) 24
Water Quality - Bacteriological Quality Compliance 100%
Water Quality - Bacteriological Testing Compliance 100%
Water Quality - All Samples Compliance 100%

Operational Indicators

Operational Indicators At end of
January 2021
Regional Average
Non-Revenue Water (%) 24.05%
Defective Meters per '000 connections 6.72
Operational Staff/ 1000 connection 2.41
Estimated Bills/ 1000 connections 26.47

Performance in Customer Service

Customer Service Indicators At end of
January 2021
Regional Average
Response to requests for new service connections (%) 100%
Customer Complaints Volume (Complaints/ 1000 connection) 13.79
Customer Complaints Sold  

Key Performance Indicators (KPIs)

Financial KPIs At end of
January 2021
Regional Average
 Accounts Receivable Period (months) 2.74
Operating Ratio 0.39
Stock Efficiency (LKR/ connection) 1,355.70


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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


Name & Designation Telephone Mobile E-mail

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

+94 11 2224800 +94 77 7771212



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Mrs. P.G.Nalayini
Assistant General Manager


+94 11 2224801 +94 77 7660086
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 Managers (Operational & Maintenance)

Name & Designation Telephone Fax Mobile E-mail

Mr. Z.T.M.Fazli

Responsive Areas: Dehiwala, Kalubovila, Kohuwala, Mt.Lavinia, Ratmalana and Moratuwa.

+94 11 2734444 +94 11 2713108 +94777696793   This email address is being protected from spambots. You need JavaScript enabled to view it.

Mr. H.A.E.N.Huladduwa Arachchi
Responsive Areas: Panadura, Bandaragma, Welmilla, Kumbuka, Horana, Ingiriya

+94777392467 +94382241544 +94382241856-7 This email address is being protected from spambots. You need JavaScript enabled to view it.

Mr. U.D.P.M.Gunasinghe
Responsive Areas:

Wadduwa, Kalutara, Payagala, Beruwala, Aluthgama, Matugama

+94342222278 +94342221614 +94718009877  This email address is being protected from spambots. You need JavaScript enabled to view it.



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