In line with one of the primary national objectives in the expansion of sustainable drinking water facilities to the nation, the decision was taken to establish Western Province Regional Support Center in the year 2008. Later it was decided to decentralized the NWSDB operation of Western Province into three functional areas and as a result, the Regional Support Center (Western-South) was established in the present form in the year 1992 with the main objective of serving as the main body in the region in providing safe sustainable drinking water and 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 region are Dehiwala , Moratuwa & Ratmalana DS divisions and some parts of Homagama DS in Colombo District, and all DS divisions in Kalutara district and a part of a 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 relevant population is 1.7 Million . This Region has undergone 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 region is headed by Deputy General Manager & assisted by Assistant General Manager. The Operational and Maintenance ( O&M ) activities within the Western-South region are divided into three regions namely Dehiwala, Panadura/Horana and Kalutara where each region is headed by a Regional Manager. Total staff within the Western South region is about 736 as at the end of December 2018 whose dedication to work has helped Regional Support Center (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 region provides safe pipe-born drinking water to about 1,275,543 peoples via 264,393 service connections as at December 2018. In addition to this, the community managed Rural Water Schemes of the region contribute 4.5 % of safe pipe-born water supplied through 137 Community Based Organizations (CBOs) for which close monitoring, capacity development and technical guidance as well as functioning facilities are provided through RWS sections of NWSDB in the region.

Further, we have established a well-functioning clustered laboratory system in the region enabling Chemical and Bacteriological testing accordance with updated SLS standards and in the process of obtaining ISO 17025 Laboratory Accreditation certification in 2019. This contributes to reduction in numbers of incidents of water borne diseases which in turn benefits the population by upgrading their livelihood as a result of 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 the most effective tools in improving operational efficiency, quality of service and productivity of the organization and various steps to enhance the IT Infrastructure and Solutions to suit the needs of the organization have been taken while keeping 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 region’s commercial contribution as a whole has generated Rs. 3,080 Million revenue in the year 2018, which is about 12% of the total revenue of the NWSBD.

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




RSC (W-S) Office Premises


 Location map RSC (W-S)

Location map


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


Action plan 2016-2020

According to the vision and mission of the NWSBD, prepare the action plan in every five year to reach the NWSBD goal.
According to the NWSBD main action plan, all regional support centers will be prepare their sub five year action plan to reach goal of NWSBD.

RSC (W-S) five year action plan

2016-2020  Gole 1 click hear to view / download

2016-2020  Gole 2 click hear to view / download

2016-2020  Gole 3 click heato view / download

2016-2020  Gole 4 click hear to view / download

RSC (W-S) Annual action plan

2016  annual action plan click hear to view / download

2017 annual action plan click hear to view / download

2018 annual action plan click hear to view / download


Write comment (0 Comments)



No of Connections

(At July 2018) 

 Dehiwala  60,931
 Moratuwa  47,501
WSS Name 

No of Connections at July 2018 

Panadura 42,885
Bandaragama  15,964
Horana  12,268
Ingiriya 1,312
Kubuka 9,330
WSS Name 

No of Connections

 at July 2018

Kaluthara 17,887
Wadduwa 16,215
Beruwala 10,830
Aluthgama 10,503
Bombuwala 3,217
Payagala 10,005
Mathugama 479


Write comment (0 Comments)
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(Sep) 261,766
Connection varariation


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 September 2018 Average Monthly Production (m3/ month)
Dehiwala Region  Dehiwala 61,248 3,250,700
Moratuwa 47,663
Kalutara Region        Wadduwa 16,278 259,232
Kalutara 17,984 442,152
Bombuwala 3,268 48,480
Payagala 10,019 194,337
Beruwala 10,872 287,544
Aluthgama 10,540 190,038
Matugama 479 7,013
Panadura/Horana Region     Horana 12,528 274,680
Bandaragama 16,238 310,020
Keselwatte 43,497 958,350
Ingiriya 1,312 21,120
Kubuka 9,840 145,380
Total 261,766  6,397,752

Service Standard Indicators

Service Indicators 

At end of

September 2018

Regional Average
Water Coverage (%) Pipe System maintained by NWSDB 57.21%
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
September 2018
Regional Average
Non-Revenue Water (%) 19.62%
Defective Meters per '000 connections 4.03
Operational Staff/ 1000 connection 2.85
Estimated Bills/ 1000 connections 8.16

Performance in Customer Service

Customer Service Indicators At end of
September 2018
Regional Average
Response to requests for new service connections (%) 93%
Customer Complaints Volume (Complaints/ 1000 connection) 23.99
Customer Complaints Sold 100%

Key Performance Indicators (KPIs)

Financial KPIs At end of
September 2018
Regional Average
 Accounts Receivable Period (months) 0.201
Operating Ratio 0.04
Stock Efficiency (LKR/ connection) 1179


Repository on Supply of Water in the RSC Western South Data book for RSC (W-S).Click hear to download the book


Write comment (0 Comments)


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

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


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



Write comment (0 Comments)