During the initial stages of the NWSDB, from 1975
to 1990, provision of potable water supply to townships, villages
and industrial estates was given more consideration. However, with
the increase of water usage and land becoming inadequate for on site
sanitation, emphasis was given for sewerage too during the last 10
years. At present, NWSDB maintains the sewerage systems in Kolonnawa,
Dehiwela - Mt. Lavinia several NHDA housing schemes in GC area, Hantana
and Kataragama. The CMC owns and maintains the Colombo City sewerage
system. A pipe borne sewerage scheme has recently been commissioned
for the coastal town of Hikkaduwa located 100 km South of Colombo.
Wastewater collection, treatment and disposal systems of Katunayake,
Seethawake, Biyagama and Koggala Investment Promotion Zones are maintained
by the NWSDB on behalf of BOI. Treatment systems for Mawathagama,
Polgahawela, Modarawila and Mirigama Investment Promotion zones are
being constructed by the NWSDB at present.
A pipe borne sewerage project to minimize the environmental pollution
of Kandy City center and surrounding area is to be implemented with
Japanese assistance. Feasibility studies including Environmental Impact
Assessment were already finalized including lands for pump stations
and treatment plant. It is proposed to locate the treatment plant
in a land belonging to the Agriculture Department, Peradeniya and
discharge effluent after treatment to the Mahaweli Ganga.
A project was formulated recently with the assistance of Swedish Government
for Ja Ela - Ekala and Moratuwa – Ratmalana Industrial and Residential
areas. It is proposed to have a sewer network and a treatment plant
at Ja Ela - Ekala while another treatment plant and a short sea outfall
is proposed for Moratuwa - Ratmalana. A substantially large area is
to be sewered in Moratuwa including the town and the University
under the proposed project.
Projects to address the immediate rehabilitation needs of the Colombo
city – Northern and Southern sewerage system are being implemented
with the assistance of Danish and Austrian Governments. Respectively
It is proposed to construct a new pump station at Madampitiya and
to rehabilitate Peterson Lane pump station including rehabilitation
of about 20 km of main sewer lines from Kollupitiya to Madampitiya
under Northern project, where as new pumping station at Wellawatte
and rehabilitation of about 9 km of sewer lines will be included in
the Southern Project.
A water supply & sewerage project has been formulated for Kurunegala
town and DANIDA mixed credit has been identified for funding. This
project is in tendering stage at present.
The ADB has assisted to carry out a consultancy assignment to study
the feasibility of Jaffna Peninsula Water supply & Sewerage Project.
This study was completed this year. US government has provided funds
to study sewerage requirements of coastal Town under Tsunami aristae.
The ADB has also funded the Greater Colombo Waste Water Management
Sector Review to review the overall sewerage problem of Greater Colombo.
The consultants mobilized in the latter part of 2005.
A pipe borne sewerage scheme is being formulated by the NWSDB for
Sri Jayawardenepura Kotte, Capital City of Sri Lanka with the assistance
of Chinese Government. Basic designs and project formulation are almost
completed and it is expected to start construction in 2009 once contract
negotiations are over.
Planning and Designs including preparation of tender documents have
been completed for sewerage facilities in Tsunami Housing schemes
located in Trincomalee, Ampara, Galle and Kalutara. Similar assignments
are being carried out for Sri Jayawardenepura University, Havelock
City, Ratmalana Tsunami Housing, Thelippalai Cancer Hospital and Ranala
The NWSDB imposed a sewerage service charge with effect from 01st
April 2008 in all sewerage schemes maintained by the NWSDB. Presently,
NWSDB maintains the sewerage systems of about 06 large housing schemes
(Mattegoda, Soysapura, Jayawadanagama, Madddumagewatte, Raddolugama
and Hantane) with a total of 10,000 housing units in addition to earlier
mentioned sewerage schemes. Furthermore, foreign lending agencies
were insisting on the introduction of a sewerage service charge to
extend loan facilities for new sewerage projects. Imposition of a
fee is required to cover the O&M costs of the existing systems
as well as to gradually expand the sewerage facilities to other urban