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 1992. 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 2008 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 NWSDB.



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)




RSC (W-S) Office Premises


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 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


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


 Location Map RSC (W-S)


Regional Support Centre(Western - South)

National Water Supply & Drainage Board

No.07, Angulana station Road,
Sri Lanka.

Tel:+94 11 2224888

Fax:+94 11 2637945 / +94 11 2637947