Sir,
As per Sl. No.12 of mega exemption notification No. 25/2012-ST dated 20.6.2012 (w.e.f. 1.7.2012) the following Services provided to the Government, a local authority or a governmental authority by way of construction, erection, commissioning, installation, completion, fitting out, repair, maintenance, renovation, or alteration of -
(a) 38[omitted]
(b) a historical monument, archaeological site or remains of national importance, archaeological excavation, or antiquity specified under the Ancient Monuments and Archaeological Sites and Remains Act, 1958 (24 of 1958);
(c) 38[omitted]
(d) canal, dam or other irrigation works;
(e) pipeline, conduit or plant for (i) water supply (ii) water treatment, or (iii) sewerage treatment or disposal; or
(f) 38[omitted]
alone are exempted. In your query services related to sanitation and water supply alone are exempted. Other services are liable to service tax subject to exemption limit of 10 lakhs.