Water quality

Each Group company proceeds with monitoring plans on the quality of the drinking water provided and the waste water returned to the environment after treatment. The analytical checks on water distributed to customers are of fundamental importance due to the health repercussions which derive therefrom. The following tables No. 83 and 84 and the charts No. 38 and 39 provide a summary of the activities carried out in this sphere:

Table No. 83 – ANALYTICAL CHECKS ON DRINKING WATER: TOTALS AND BY COMPANY (2010-2012)

Company No. of analytical controls
  2010 2011 2012
Acea Ato 2 330,269 337,529 328,202
Acea Ato 5 74,309 94,327 79,953
Gori 82,801 82,193 70,488
Acque 228,485 254,297 330,569
Publiacqua 209,334 189,508 192,653
Acquedotto del Fiora 61,001 65,007 87,079
Umbra Acque 94,942 79,876 80,257
Total 1,081,141 1,102,737 1,169,201

Table No. 84 –ANALYTICAL CHECKS ON WASTE WATER: TOTALS AND BY COMPANY (2010-2012)

Company No. of analytical controls
  2010 2011 2012
Acea Ato 2 98,150 95,527 122,231
Acea Ato 5 28,383 17,786 23,816
Gori 15,979 14,986 9,821
Acque 103,239 105,076 125,546
Publiacqua 33,497 34,405 37,664
Acquedotto del Fiora (*) 31,699 42,902 48,259
Umbra Acque 40,258 47,638 45,124
Total 351,205 358,320 412,461

Chart No. 38 – ANALYTICAL CHECKS ON DRINKING WATER: TOTALS AND BY COMPANY (2012)  

Chart No. 38 – Analytical checks on drinking water: totals and by company (2012)

Chart No. 39 – ANALYTICAL CHEKS ON WASTE WATER: TOTALS AND BY COMPANY (2012)

Chart No. 39 – ANALY TICAL CHECKS ON WASTE WATER: TOTALS AND BY COMPANY (2012)

Current legislation on this subject for water intended for human consumption (Italian Legislative Decree No. 31/2001 and subsequent amendments and additions) identifies a number of drinking water quality parameters (including arsenic and fluorine) and indicates the limit values. Specifically, the value established for arsenic is equal to 10 micrograms per litre, while for fluorine it is 1.5 milligrams per litre. These limits are exceeded in particular geographic areas in Italy due to the volcanic nature of the ground. A number of areas in Lazio are also affected by this phenomenon, served by Acea Ato 2 which straightaway took steps, as soon as it took over the running of the plants, to bring the values back under the threshold established. The company is therefore carrying out the work envisaged in the recovery plans according to a timescale agreed with the competent Authorities (also see Customers and the community, Quality supplied in the water area).

Quality of the water distributed in Rome  

The quality of the water distributed in Rome, as already mentioned, has always been very high. The water in fact is very pure and has an excellent mineral level, which makes it a genuine unicum in the water sphere not only at national level.

In order to maintain this asset intact, Acea pays particular attention to the execution of accurate monitoring and frequent analytical controls. In order to ensure maximum quality in the prevention activities, Acea avails itself of external laboratories, meticulously chosen, as well as the professional support of the subsidiary company LaboratoRI, accredited for the performance of chemical-physical, chemical-organic and microbiological daily analysis on samples taken from the entire aqueduct system (see tables No. 85-87). 

Table No. 85 – ANALYTICAL TESTS CARRIED OUT OVERALL IN ATO 2 - CENTRAL LAZIO (2010-2012)

Type of water analysed No. of analytical tests
  2010 2011 2012
Drinking water 305,258 313,804 309,751
Waste water 98,150 94,557 117,440
Surface water 35,387 36,413 36,828
Total 438,795 444,774 464,019
NB: the figures refer to the analytical activities carried out by LaboratoRI

Table No. 86 - ANALYTICAL TESTS ON DRINKING WATER – HISTORIC NETWORK OF ROME (2010-2012)

Area of withdrawal No. of withdrawal points No. of samples No. of analytical tests
    2010 2011 2012 2010 2011 2012
Collection 45 515 590 510 21,451 22,973 22,364
Aqueduct and water pipelines 26 280 301 338 9,531 10,611 9,502
Reservoirs/water centres 21 222 260 217 7,948 8,299 7,483
Distribution networks 320 3,557 3,885 3,970 113,762 126,437 123,748
Total 412 4,574 5,036 5,035 152,692 168,320 163,097
NB: the figures refer to the analytical activities carried out by LaboratoRI.

Table No. 87 – AVERAGE CHEMICAL AND MICROBIOLOGICAL FEATURES OF THE WATER DISTRIBUTED IN ROME AND ITALIAN LEGISLATIVE DECREE NO. 31/01 (2012)

Parameters Unit of measurement 2012 average
value 
Legal parameter (Italian Legislative Decree No. 31/01)
Turbidity NTU <0.5 without anomalous variations
Temperature °C 12.8 not envisaged
Concentration of hydrogen ions pH unit 7.45 >6.5 and < 9.5
Electrical conductivity µS/cm at 20 °C 557 < 2,500
Chlorides mg/l Cl 9.68 < 250
Sulphates mg/l SO4 18.3 < 250
Calcium mg/l Ca 96.4 not envisaged
Magnesium mg/l Mg 18.9 not envisaged
Sodium mg/l Na 7.96 < 200
Total water hardness mg/l K 4.88 not envisaged
Water hardness °F 31.8 (*)
Free residual chlorine mg/L Cl2 0.15 (**)
Alkalinity mg/L CaCO3 315 not envisaged
Fixed residual calculated mg/l 399 ***
Nitrates mg/l NO3 4.24 < 50
Nitrites mg/l NO2 <0.05 < 0.50
Ammonia mg/l NH4 <0.10 < 0.50
Fluorides mg/l F 0.20 < 1.50
Total organic carbon mg/l C 0.43 without anomalous variations
Iron µg/l Fe 5.30 < 200
Copper mg/l Cu 0.002 < 1.0
Lead µg/l Pb 0.26 < 10
Cadmium µg/l Cd <0.2 < 5.0
Chromium µg/l Cr <5.0 < 50
Nickel µg/l Ni <2.0 < 20
Manganese µg/l Mn 0.43 < 50
Arsenic µg/l As 1.34 < 10
Vanadium µg/l V 6.67 < 140
Total trialomethanes µg/l 2.01 < 30
Trichlorethylene µg/L 0.14 < 10
Tetrachlorethylene µg/L 0.13 < 10
1.2 - Dichloroethane µg/L <0.30 < 3.0
Benzene µg/l <0.10 < 1.0
Benzopyrene µg/l <0.003 < 0.010
Coliform bacteria at 37° C MPN/100 ml 0 0
Escherichia coli MPN/100 ml 0 0
Enterococcus UFC/100 mL 0 0
(*) recommended values: 15-50 °F - the lower limit is valid for water subject to softening or desalination treatment (**) recommended value 0.2 mg/L (***) maximum value recommended: 1,500 mg/L