| Port Louis Water Supply System This System serves the capital city and its immediate suburbs. It caters for the daily potable water needs of a resident population of 130,000, a commuting public of 70,000, some light manufacturing industries, commercial enterprises and government departments and institutions. System Characteristics - Service area covered = 36km²
- Population served = 200,000
- Number of Accounts = 39,365
Main Water Sources - Grand Riviere North West
- Pierre Fond Tunnel
Normal production = 100,000 m³/day - Surface water = 61%
- Ground water = 39%
Treatment Plant Pailles Treatment Plant, a slow sand filter plant, with a treatment capacity of 60,000 m³/day. Non Treated Water | Non Treated Water | Accounts | | Agricultural Boreholes | 16 | | Industrial Boreholes | 14 | | Surface water | 2 | District Water Supply System - North The system caters for the potable water needs of Households and economic operators in the Northern Districts. System Characteristics - Service area covered = 337 km²
- Population served = 307,675
- Number of Accounts = 61,535
Main water sources - Midlands Dam
- La Nicolière Reservoir
- Bassin Loulou
- Rivalland Spring
- Ground water abstraction
Normal Production: 123,000 m³/day - Surface water = 45%
- Groundwater = 55%
Treatment Plant A newly constructed rapid gravity treatment plant of 66,000 m³/day capacity, at La Nicolière. Non Treated Water | Non Treated Water | Accounts | | Agricultural Boreholes | 40 | | Industrial Boreholes | 47 | | Surface water | 8 | | CTBW | 1 | District Water Supply System - East This system caters for the potable water supply needs of Households and other economic operators of the eastern region. System Characteristics - Service area covered = 232 km²
- Population served =150,000
- Number of Accounts = 38,656
Main Water Sources - Piton du Milieu Reservoir
- Groundwater abstraction
Normal Production - 72,000 m³ daily - Surface water = 28%
- Groundwater = 72%
Treatment Plant Piton du Milieu Treatment Plant is a rapid gravity treatment plant. First Phase constructed in 1955 with filtration capacity of 17,000 m³/day. With the implementation of the Phase II, the treatment capacity has been increased to 30,000 m³/day. Phase III was completed in 2000,thus bringing the total treatment capacity of the plant to 37,000 m³/day. Non Treated Water | Non Treated Water | Accounts | | Agricultural Boreholes | 3 | | Industrial Boreholes | 4 | District Water Supply System - South System Characteristics This system caters to the potale water needs of the population and economic operators of the districts of Savanne and Grand Port. - System area = 220 km²
- Population served = 210,000
- Number of Accounts = 42,555
Main Water Sources Surface Water - Riviere du Poste T.P.
- Mont Blanc T.P.
- Bois Cheri Filter
Ground water -
Cluny B.H. -
Trois Boutiques B.H. -
Nouvelle France B.H. -
Gebert B.H. -
Cafe B.H. Normal production = 75,000 m³/day - Surface water = 40%
- Ground water = 60%
Treatment Plant Riviere du Poste Treatment Plant (1994) is a rapid gravity treatment plant of a total capacity of 13,500 m³/day capacity. Mont Blanc Treatment Plant (1995) is a rapid gravity treatment plant with a total treatment capacity of 11,000 m³/day. Non Treated Water | Non Treated Water | Accounts | | Agricultural Boreholes | 15 | | Industrial Boreholes | 7 | | Surface Water | 3 | Mare aux Vacoas Water Supply System - Upper System Characteristics This system caters to the potable water supply for the central part of the island covering the following regions: Forest Side, Curepipe, Floreal, Vacoas, Mesnil, up to Highlands, Moka, St. Pierre Nouvelle Decouverte, Alma, Quartier Militaire. - System area : 220 km²
- Population served : 220,000
- Number of Accounts : 52,091
Main Water Sources - Mare aux Vacoas Reservoir
- Ground water abstraction
Normal production = 114,000 m³/day - Surface water = 77%
- Groundwater = 23%
Treatment Plant La Marie Treatment Plant is the oldest slow sand treatment plant in operation. It came into operation around March, 1888. The total treatment capacity is 60,000 m³/day. The Treatment plant has recently been refurbished. There is a now a new rapid gravity filtration plant of 70,000 m³/day capacity. The total treatment capacity of the slow sand and rapid sand filters is 130,000 m3/day. Non Treated Water | Non Treated Water | Accounts | | Agricultural Boreholes | 7 | | Industrial Boreholes | 46 | | Surface Water | 3 | Mare aux Vacoas Water Supply System - Lower System Characteristics This system caters for potable water supply to Lower Plaines Wilhems and includes the Cities of Quatre Bornes and Beau Bassin -Rose Hill and the rural areas in the Black River District. System Characteristics - System area = 200 km²
- Population Served = 227,000
- Number of Accounts = 51,000
Main water Sources - Ground water Sources (Curepipe Aquifer)
Normal production : 110,000 m³/day Groundwater = 82%; suplemented with surface water from MaV (Upper) when necessary. Non Treated Water | Non Treated Water | Accounts | | Agricultural Boreholes | 22 | | Industrial Boreholes | 11 | | Surface Water | 5 | | 
