Maintenance Schemes

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Operation and Maintenance of CWSS:

As per GO MS No 84 / MA &WS dt.10.03.94 the Combined Water Supply Schemes (CWSS) implemented in Tamil Nadu covering more than one Local Body are being maintained by TWAD Board.

Schemes Under Maintenance of TWAD Board:

Number of Schemes Under Maintenance.  523 
Beneficiaries (Civic status-wise) 
Corporation Municipalities Town Panchayats Rural Habitations Industries / Commercial Organisations; Population (crores)
11 65 320 48,948 567 4.26

Maintenance Pattern:

The schemes are maintained by 49 Divisions of TWAD Board spread over all districts of Tamil Nadu except Chennai Corporation. TWAD Board maintains the infrastructure of Head Works, Pumping Stations and Pumping Mains up to delivery of water to the Over Head Tanks of the Beneficiaries. Maintenance of Over Head Tanks and the local distribution system is taken care by the concerned Local Body.

The expenditure towards the maintenance of these CWSS is met out from the water charges collected from the beneficiaries at the tariff rate fixed by the Government. The tariff fixed for the local bodies by the Government is as below

Tariff structure:

S.No GO reference Period Tariff Rs/1KL
From To
Rural Urban
1 As per GO (MS) No. 136 MA&WS (WS4) Department dt:03.10.2002. 11.08.1997 02.10.2002 2.25 3.00
2 As per GO (MS) No. 338 MA&WS(WS4) Department dt: 18.10.2004. 03.10.2002 30.11.2017 3.00 4.50
3 As per GO (MS) No. 39 MA&WS(WS4) Department dt: 17.04.2018. 01.12.2017 31.03.2018 7.00 9.00
01.04.2018 31.03.2019 7.35 9.45
01.04.2019 31.03.2020 7.72 9.92
01.04.2020 31.03.2021 8.11 10.42
01.04.2021 31.03.2022 8.51 10.94
01.04.2022 31.03.2023 8.94 11.49

The tariff for Institutions/ Industries vary from Rs 30/KL to Rs 150/KL depending with category of the beneficiary as per B.P.M.S.No. 88 (O&M) wing, Dt 08.11.2017.

Organisations who have paid proportionate Cost Of Scheme Rs.45.00 /KL
For Industries /Commercial Organisations who have NOT paid the proportionate cost of CWSS
Industries / Commercial Organisations Rs. 150.00 /KL
Private Educational Institutions Rs.125.00 /KL
Private Hospitals Rs. 125.00 /KL
Government Industries and Organisations Rs. 80.00 /KL
Government Hospitals, Government Educational Institutions Places of Worship  Rs.30.00 /KL
Orphanage & Homes Rs. 30.00 /KL
S.No
Name of District No.of CWSS Designed Qty in MLD Corporation Municipalities TP Rural Habns Private Beneficiaries Total No.of beneficiaries Population Benefited

CHIEF ENGINEER/VELLORE

1 Krishnagiri 18 78.48 1 1 7 5079 3 5090 2086608
2 Chengalpattu 12 25.63 1 2 1 87 14 101 780852
3 Thirupathur 1 51.64 1 12 5 698 - 716 981076
4 Kanchipuram 8 5.35 0 0 1 89 5 94 173572
5 Ranipet 9 12.65 0 2 0 68 1 72 178090
6 Kallakurichi 4 11.88 - 1 2 116 0 119 445207
7 Dharmapuri 7 63.89 0 10 10 3432 3 3446 1717445
8 Villupuram 3 4.71 - - 1 39 0 40 92323
9 Cuddalore 15 13.07 0 0 2 478 0 480 260434
10 TVMalai 27 25.20 0 0 6 790 2 799 634281
11 Vellore 4 2.59 0 0 0 88 0 88 57126
12 Tiruvallur 8 4.26 0 0 0 168 0 168 112938
TOTAL(NR) 116 298.64 3 28 35 11132 28 11213 7519952

CHIEF ENGINEER/THANJAVUR

13 Ariyalur 8 31.25 - 1 1 769 0 769 1008042
14 Pudukkottai 32 72.503 0 1 5 4260 12 4273 1873769
15 Thanjavur 8 47.914 0 1 7 991 1 997 1013576
16 Tiruvarur 1 23 0 1 1 313 0 315 468989
17 Nagapattinam 5 40.33 0 2 3 1056 3 1065 784620
18 Mayiladuthurai 7 29.82 0 0 2 662 2 666 735436
19 Perambalur 5 27.633 0 1 3 616 5 625 572097
20 Trichy 30 142.532 1 2 8 3886 26 3926 2581153
TOTAL(ER) 96 414.982 1 9 30 12553 49 12636 9037682

CHIEF ENGINEER/COIMBATORE

21 Erode 38 106.05 1 0 28 2476 37 2552 1741993
22 Namakkal 12 50.111 0 1 11 2120 22 2154 1345403
23 Nilgris 2 13.01 0 1 0 100 4 107 90441
24 Karur 12 27.12 0 0 2 1206 0 1208 598643
25 Salem 9 179.945 0 3 25 4303 17 4360 3468520
26 Tiruppur 13 85.951 0 3 12 2551 0 2568 1257580
27 Coimbatore 12 354.024 2 5 29 1206 59 1314 7095178
TOTAL(WR) 98 816.211 3 13 107 13962 139 14263 15597758

CHIEF ENGINEER/MADURAI

28 Madurai 8 92.43 1 2 8 2151 9 2174 2122073
29 Theni 26 41.96 0 0 12 431 3 447 805227
30 Dindigul 30 60.11 1 1 15 2433 6 2457 1909503
31 Sivagangai 24 74.39 0 1 4 1344 2 1351 543844
32 Ramanathapuram 32 8.75 0 4 7 2971 3 2985 1535270
33 Virudunagar 12 71.38 1 4 9 1751 0 1865 2367177
34 Thoothukudi 24 87.86 0 1 12 1386 87 1490 1315983
35 Tirunelveli 22 83.32 -- 1 12 1741 7 1756 1510078
36 Kanyakumari 13 80.71 1 2 42 675 0 738 1564997
37 Tenkasi 9 54.62 0 6 16 557 4 587 1330357
TOTAL(SR) 200 655.54 4 22 137 15440 121 15850 15004509
GRANDTOTAL 558 2249.03 8 69 337 48948 562 51976 42610650