Italy · Comune

Drinking water in Guidonia Montecelio

5 supply zones, published by ACEA ATO 2 S.p.A.. The values come from the publications of the Italian water suppliers (gestori), which D.Lgs. 18/2023 requires of them from 12 January 2026. Italian parametric values apply: trihalomethanes 30 instead of 50 µg/l, chromium 25 µg/l, uranium 30 instead of 10 µg/l; for hardness there is no maximum value, it is given in French degrees (°F).

ZONA 1 PESCHIERA CAPORE

ACEA ATO 2 S.p.A.

Water hardness

19.2 °dH

Key values ZONA 1 PESCHIERA CAPORE
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sum of PFAS	<0,10 µg/L below limit of quantification	0.1 µg/l	< 100 % *	Median
Nitrate	3,03 mg/L NO3	50 mg/l	6 %	Median
Lead	<0,2 µg/L Pb below limit of quantification	10 µg/l	—	Median
Escherichia coli (E. coli)	Conforme MPN/100 mL	0/100 ml	—	Median
Sulphate	16,7 mg/L SO4	250 mg/l	7 %	Median
Sodium	4,0 mg/L Na	200 mg/l	2 %	Median

* Value below the limit of quantification: the actual share of the parametric value is not known; it lies somewhere below the stated upper bound. The marker shows where the limit of quantification of the measurement lies relative to the parametric value.

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (2)

Microbiology – ZONA 1 PESCHIERA CAPORE
Parameter	Value	Parametric value	Share of the parametric value	Reference
Escherichia coli (E. coli)	Conforme MPN/100 mL	0/100 ml	—	Median
Intestinal enterococci	Conforme N/100 mL	0/100 ml	—	Median

Chemical parameters (28)

Chemical parameters – ZONA 1 PESCHIERA CAPORE
Parameter	Value	Parametric value	Share of the parametric value	Reference
1,2-dichloroethane	<0,1 µg/L below limit of quantification	3 µg/l	< 3 % *	Median
Acrylamide	<0,03 µg/L below limit of quantification	0.1 µg/l	< 30 % *	Median
Antimony	<1,0 µg/L Sb below limit of quantification	10 µg/l	—	Median
Arsenic	<1,0 µg/L As below limit of quantification	10 µg/l	< 10 % *	Median
Bisphenol A	<0,25 µg/L below limit of quantification	2.5 µg/l	< 10 % *	Median
Boron	0,021 mg/L B	1.5 mg/l	—	Median
Cadmium	<0,2 µg/L Cd below limit of quantification	5 µg/l	—	Median
Chlorate	<0,05 mg/L ClO3 below limit of quantification	0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid	—	Median
Chlorite	<0,05 mg/L ClO2 below limit of quantification	0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid	—	Median
Chromium	<5,0 µg/L Cr below limit of quantification	25 µg/l	—	Median
Copper	0,002 mg/L Cu	2 mg/l	—	Median
Cyanide	<10 µg/L CN below limit of quantification	50 µg/l	—	Median
Epichlorohydrin	<0,05 µg/L below limit of quantification	0.1 µg/l	< 50 % *	Median
Fluoride	0,12 mg/L	1.5 mg/l	8 %	Median
Haloacetic acids (HAA)	- µg/L not determined	60 µg/l	—	Median
Lead	<0,2 µg/L Pb below limit of quantification	10 µg/l	—	Median
Mercury	<0,2 µg/L Hg below limit of quantification	1 µg/l	—	Median
Nickel	<2,0 µg/L Ni below limit of quantification	20 µg/l	—	Median
Nitrate	3,03 mg/L NO3	50 mg/l	6 %	Median
Nitrite	<0,05 mg/L NO2 below limit of quantification	0.5 mg/l	< 10 % *	Median
Pesticides — Total	- µg/L not determined	0.5 µg/l	—	Median
Polycyclic aromatic hydrocarbons	- µg/L not determined	0.1 µg/l	—	Median
Selenium	<1,0 µg/L Se below limit of quantification	20 µg/l	—	Median
Tetrachloroethene	<1,0 µg/L below limit of quantification	—	—	Median
Trichloroethene	<1,0 µg/L below limit of quantification	—	—	Median
Trihalomethanes — Total	<1,0 µg/L below limit of quantification	30 µg/l	< 3 % *	Median
Uranium	1,00 µg/L U	30 µg/l	—	Median
Vinyl chloride	<0,1 µg/L below limit of quantification	0.5 µg/l	< 20 % *	Median

PFAS (1)

PFAS – ZONA 1 PESCHIERA CAPORE
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sum of PFAS	<0,10 µg/L below limit of quantification	0.1 µg/l	< 100 % *	Median

Indicator parameters (16)

Indicator parameters – ZONA 1 PESCHIERA CAPORE
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	1,0 µg/L Al	0.2 mg/l	—	Median
Ammonium	<0,1 mg/L NH4 below limit of quantification	0.5 mg/l	< 20 % *	Median
Chloride	6,5 mg/L Cl	250 mg/l	3 %	Median
Coliform bacteria	Conforme MPN/100 mL	0/100 ml	—	Median
Colour	Incolore Scala Pt/C	accettabile per i consumatori, senza variazioni anomale	—	Median
Conductivity (25 °C)	573 µS/cm	2,500 µS/cm	—	Median
Iron	<5,0 µg/L Fe below limit of quantification	0.2 mg/l	—	Median
Manganese	<0,2 µg/L Mn below limit of quantification	50 µg/l	—	Median
Odour	0 Diluiz. 25	accettabile per i consumatori, senza variazioni anomale	—	Median
pH	7,60 pH	6,5–9,5	—	Median
Sodium	4,0 mg/L Na	200 mg/l	2 %	Median
Sulphate	16,7 mg/L SO4	250 mg/l	7 %	Median
Taste	0 tasso diluz.	accettabile per i consumatori, senza variazioni anomale	—	Median
Temperature	12,0 °C	—	—	Median
Total organic carbon (TOC)	0,34 mg/L C	senza variazioni anomale	—	Median
Turbidity	<0,5 NTU below limit of quantification	accettabile per i consumatori, senza variazioni anomale	—	Median

Treatment substances (1)

Treatment substances – ZONA 1 PESCHIERA CAPORE
Parameter	Value	Parametric value	Share of the parametric value	Reference
Free chlorine	0,16 mg/L Cl2	—	—	Median

Further parameters (13)

Further parameters – ZONA 1 PESCHIERA CAPORE
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	335 mg/L CaCO3	—	—	Median
Beryllium	<0,2 µg/L Be below limit of quantification	—	—	Median
Bromide	<50 µg/L Br below limit of quantification	—	—	Median
Calcium	106,00 mg/L Ca	—	—	Median
Dry residue	410 mg/L	—	—	Median
Hydrogen carbonate	409 mg/L HCO3	—	—	Median
Magnesium	19,00 mg/L Mg	—	—	Median
Phosphate	<50 µg/L P2O5 below limit of quantification	—	—	Median
Potassium	1,19 mg/L K	—	—	Median
Silicate / silicic acid	5,4 mg/L SiO2	—	—	Median
Thallium	<0,2 µg/L Tl below limit of quantification	—	—	Median
Total hardness	34,3 °F	—	—	Median
Vanadium	1,00 µg/L V	0.14 mg/l	—	Median

Values taken unchanged from the publications linked below — for each parameter the most recent recorded value. „—" in the parametric value column: no currently valid legal parametric value is stored in our database for this parameter; the parameter register with all parametric values is being expanded continuously.

Source: https://www.aceaato2.a-acqua.it/content/dam/acea-ato2/pdf/it/mappe-qualita/guidonia_montecelio_zona_1_peschiera_capore.pdf · luglio 2026 · luglio 2026 · retrieved on 08/07/2026

Zona 2 CIS

ACEA ATO 2 S.p.A.

Water hardness

9.9 °dH

Key values Zona 2 CIS
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sum of PFAS	<0,10 µg/L below limit of quantification	0.1 µg/l	< 100 % *	Median · Zona 2 CIS
Nitrate	1,95 mg/L NO3	50 mg/l	4 %	Median · Zona 2 CIS
Lead	<0,2 µg/L Pb below limit of quantification	10 µg/l	—	Median · Zona 2 CIS
Escherichia coli (E. coli)	Conforme MPN/100 mL	0/100 ml	—	Median · Zona 2 CIS
Sulphate	2,66 mg/L SO4	250 mg/l	1 %	Median · Zona 2 CIS
Sodium	4,3 mg/L Na	200 mg/l	2 %	Median · Zona 2 CIS

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (2)

Microbiology – Zona 2 CIS
Parameter	Value	Parametric value	Share of the parametric value	Reference
Escherichia coli (E. coli)	Conforme MPN/100 mL	0/100 ml	—	Median · Zona 2 CIS
Intestinal enterococci	Conforme N/100 mL	0/100 ml	—	Median · Zona 2 CIS

Chemical parameters (28)

Chemical parameters – Zona 2 CIS
Parameter	Value	Parametric value	Share of the parametric value	Reference
1,2-dichloroethane	<0,1 µg/L below limit of quantification	3 µg/l	< 3 % *	Median · Zona 2 CIS
Acrylamide	<0,03 µg/L below limit of quantification	0.1 µg/l	< 30 % *	Median · Zona 2 CIS
Antimony	<1,0 µg/L Sb below limit of quantification	10 µg/l	—	Median · Zona 2 CIS
Arsenic	<1,0 µg/L As below limit of quantification	10 µg/l	< 10 % *	Median · Zona 2 CIS
Bisphenol A	<0,25 µg/L below limit of quantification	2.5 µg/l	< 10 % *	Median · Zona 2 CIS
Boron	<0,02 mg/L B below limit of quantification	1.5 mg/l	—	Median · Zona 2 CIS
Cadmium	<0,2 µg/L Cd below limit of quantification	5 µg/l	—	Median · Zona 2 CIS
Chlorate	<0,05 mg/L ClO3 below limit of quantification	0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid	—	Median · Zona 2 CIS
Chlorite	<0,05 mg/L ClO2 below limit of quantification	0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid	—	Median · Zona 2 CIS
Chromium	<5,0 µg/L Cr below limit of quantification	25 µg/l	—	Median · Zona 2 CIS
Copper	<0,001 mg/L Cu below limit of quantification	2 mg/l	—	Median · Zona 2 CIS
Cyanide	<10 µg/L CN below limit of quantification	50 µg/l	—	Median · Zona 2 CIS
Epichlorohydrin	<0,05 µg/L below limit of quantification	0.1 µg/l	< 50 % *	Median · Zona 2 CIS
Fluoride	0,10 mg/L	1.5 mg/l	7 %	Median · Zona 2 CIS
Haloacetic acids (HAA)	- µg/L not determined	60 µg/l	—	Median · Zona 2 CIS
Lead	<0,2 µg/L Pb below limit of quantification	10 µg/l	—	Median · Zona 2 CIS
Mercury	<0,2 µg/L Hg below limit of quantification	1 µg/l	—	Median · Zona 2 CIS
Nickel	<2,0 µg/L Ni below limit of quantification	20 µg/l	—	Median · Zona 2 CIS
Nitrate	1,95 mg/L NO3	50 mg/l	4 %	Median · Zona 2 CIS
Nitrite	<0,05 mg/L NO2 below limit of quantification	0.5 mg/l	< 10 % *	Median · Zona 2 CIS
Pesticides — Total	- µg/L not determined	0.5 µg/l	—	Median · Zona 2 CIS
Polycyclic aromatic hydrocarbons	- µg/L not determined	0.1 µg/l	—	Median · Zona 2 CIS
Selenium	<1,0 µg/L Se below limit of quantification	20 µg/l	—	Median · Zona 2 CIS
Tetrachloroethene	<1,0 µg/L below limit of quantification	—	—	Median · Zona 2 CIS
Trichloroethene	<1,0 µg/L below limit of quantification	—	—	Median · Zona 2 CIS
Trihalomethanes — Total	<1,0 µg/L below limit of quantification	30 µg/l	< 3 % *	Median · Zona 2 CIS
Uranium	1,00 µg/L U	30 µg/l	—	Median · Zona 2 CIS
Vinyl chloride	<0,1 µg/L below limit of quantification	0.5 µg/l	< 20 % *	Median · Zona 2 CIS

PFAS (1)

PFAS – Zona 2 CIS
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sum of PFAS	<0,10 µg/L below limit of quantification	0.1 µg/l	< 100 % *	Median · Zona 2 CIS

Indicator parameters (16)

Indicator parameters – Zona 2 CIS
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	1,7 µg/L Al	0.2 mg/l	—	Median · Zona 2 CIS
Ammonium	<0,1 mg/L NH4 below limit of quantification	0.5 mg/l	< 20 % *	Median · Zona 2 CIS
Chloride	8,7 mg/L Cl	250 mg/l	3 %	Median · Zona 2 CIS
Coliform bacteria	Conforme MPN/100 mL	0/100 ml	—	Median · Zona 2 CIS
Colour	Incolore Scala Pt/C	accettabile per i consumatori, senza variazioni anomale	—	Median · Zona 2 CIS
Conductivity (25 °C)	323 µS/cm	2,500 µS/cm	—	Median · Zona 2 CIS
Iron	<5,0 µg/L Fe below limit of quantification	0.2 mg/l	—	Median · Zona 2 CIS
Manganese	<0,2 µg/L Mn below limit of quantification	50 µg/l	—	Median · Zona 2 CIS
Odour	0 Diluiz. 25	accettabile per i consumatori, senza variazioni anomale	—	Median · Zona 2 CIS
pH	7,80 pH	6,5–9,5	—	Median · Zona 2 CIS
Sodium	4,3 mg/L Na	200 mg/l	2 %	Median · Zona 2 CIS
Sulphate	2,66 mg/L SO4	250 mg/l	1 %	Median · Zona 2 CIS
Taste	0 tasso diluz.	accettabile per i consumatori, senza variazioni anomale	—	Median · Zona 2 CIS
Temperature	13,0 °C	—	—	Median · Zona 2 CIS
Total organic carbon (TOC)	0,61 mg/L C	senza variazioni anomale	—	Median · Zona 2 CIS
Turbidity	<0,5 NTU below limit of quantification	accettabile per i consumatori, senza variazioni anomale	—	Median · Zona 2 CIS

Treatment substances (1)

Treatment substances – Zona 2 CIS
Parameter	Value	Parametric value	Share of the parametric value	Reference
Free chlorine	0,14 mg/L Cl2	—	—	Median · Zona 2 CIS

Further parameters (13)

Further parameters – Zona 2 CIS
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	185 mg/L CaCO3	—	—	Median · Zona 2 CIS
Beryllium	<0,2 µg/L Be below limit of quantification	—	—	Median · Zona 2 CIS
Bromide	<50 µg/L Br below limit of quantification	—	—	Median · Zona 2 CIS
Calcium	68,20 mg/L Ca	—	—	Median · Zona 2 CIS
Dry residue	246 mg/L	—	—	Median · Zona 2 CIS
Hydrogen carbonate	227 mg/L HCO3	—	—	Median · Zona 2 CIS
Magnesium	1,39 mg/L Mg	—	—	Median · Zona 2 CIS
Phosphate	<50 µg/L P2O5 below limit of quantification	—	—	Median · Zona 2 CIS
Potassium	0,75 mg/L K	—	—	Median · Zona 2 CIS
Silicate / silicic acid	6,9 mg/L SiO2	—	—	Median · Zona 2 CIS
Thallium	<0,2 µg/L Tl below limit of quantification	—	—	Median · Zona 2 CIS
Total hardness	17,7 °F	—	—	Median · Zona 2 CIS
Vanadium	<1,0 µg/L V below limit of quantification	0.14 mg/l	—	Median · Zona 2 CIS

Source: https://www.aceaato2.a-acqua.it/content/dam/acea-ato2/pdf/it/mappe-qualita/guidonia_montecelio_zona_2_cis.pdf · luglio 2026 · luglio 2026 · retrieved on 08/07/2026

Zona 3 Acqua Marcia

ACEA ATO 2 S.p.A.

Water hardness

17.7 °dH

Key values Zona 3 Acqua Marcia
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sum of PFAS	<0,10 µg/L below limit of quantification	0.1 µg/l	< 100 % *	Median
Nitrate	2,03 mg/L NO3	50 mg/l	4 %	Median
Lead	<0,2 µg/L Pb below limit of quantification	10 µg/l	—	Median
Escherichia coli (E. coli)	Conforme MPN/100 mL	0/100 ml	—	Median
Sulphate	3,76 mg/L SO4	250 mg/l	2 %	Median
Sodium	2,9 mg/L Na	200 mg/l	1 %	Median

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (2)

Microbiology – Zona 3 Acqua Marcia
Parameter	Value	Parametric value	Share of the parametric value	Reference
Escherichia coli (E. coli)	Conforme MPN/100 mL	0/100 ml	—	Median
Intestinal enterococci	Conforme N/100 mL	0/100 ml	—	Median

Chemical parameters (28)

Chemical parameters – Zona 3 Acqua Marcia
Parameter	Value	Parametric value	Share of the parametric value	Reference
1,2-dichloroethane	<0,1 µg/L below limit of quantification	3 µg/l	< 3 % *	Median
Acrylamide	<0,03 µg/L below limit of quantification	0.1 µg/l	< 30 % *	Median
Antimony	<1,0 µg/L Sb below limit of quantification	10 µg/l	—	Median
Arsenic	<1,0 µg/L As below limit of quantification	10 µg/l	< 10 % *	Median
Bisphenol A	<0,25 µg/L below limit of quantification	2.5 µg/l	< 10 % *	Median
Boron	0,020 mg/L B	1.5 mg/l	—	Median
Cadmium	<0,2 µg/L Cd below limit of quantification	5 µg/l	—	Median
Chlorate	<0,05 mg/L ClO3 below limit of quantification	0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid	—	Median
Chlorite	<0,05 mg/L ClO2 below limit of quantification	0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid	—	Median
Chromium	<5,0 µg/L Cr below limit of quantification	25 µg/l	—	Median
Copper	<0,001 mg/L Cu below limit of quantification	2 mg/l	—	Median
Cyanide	<10 µg/L CN below limit of quantification	50 µg/l	—	Median
Epichlorohydrin	<0,05 µg/L below limit of quantification	0.1 µg/l	< 50 % *	Median
Fluoride	0,10 mg/L	1.5 mg/l	7 %	Median
Haloacetic acids (HAA)	- µg/L not determined	60 µg/l	—	Median
Lead	<0,2 µg/L Pb below limit of quantification	10 µg/l	—	Median
Mercury	<0,2 µg/L Hg below limit of quantification	1 µg/l	—	Median
Nickel	<2,0 µg/L Ni below limit of quantification	20 µg/l	—	Median
Nitrate	2,03 mg/L NO3	50 mg/l	4 %	Median
Nitrite	<0,05 mg/L NO2 below limit of quantification	0.5 mg/l	< 10 % *	Median
Pesticides — Total	- µg/L not determined	0.5 µg/l	—	Median
Polycyclic aromatic hydrocarbons	- µg/L not determined	0.1 µg/l	—	Median
Selenium	<1,0 µg/L Se below limit of quantification	20 µg/l	—	Median
Tetrachloroethene	<1,0 µg/L below limit of quantification	—	—	Median
Trichloroethene	<1,0 µg/L below limit of quantification	—	—	Median
Trihalomethanes — Total	<1,0 µg/L below limit of quantification	30 µg/l	< 3 % *	Median
Uranium	1,00 µg/L U	30 µg/l	—	Median
Vinyl chloride	<0,1 µg/L below limit of quantification	0.5 µg/l	< 20 % *	Median

PFAS (1)

PFAS – Zona 3 Acqua Marcia
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sum of PFAS	<0,10 µg/L below limit of quantification	0.1 µg/l	< 100 % *	Median

Indicator parameters (16)

Indicator parameters – Zona 3 Acqua Marcia
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	3,3 µg/L Al	0.2 mg/l	—	Median
Ammonium	<0,1 mg/L NH4 below limit of quantification	0.5 mg/l	< 20 % *	Median
Chloride	5,3 mg/L Cl	250 mg/l	2 %	Median
Coliform bacteria	Conforme MPN/100 mL	0/100 ml	—	Median
Colour	Incolore Scala Pt/C	accettabile per i consumatori, senza variazioni anomale	—	Median
Conductivity (25 °C)	522 µS/cm	2,500 µS/cm	—	Median
Iron	15,4 µg/L Fe	0.2 mg/l	—	Median
Manganese	<0,2 µg/L Mn below limit of quantification	50 µg/l	—	Median
Odour	0 Diluiz. 25	accettabile per i consumatori, senza variazioni anomale	—	Median
pH	7,60 pH	6,5–9,5	—	Median
Sodium	2,9 mg/L Na	200 mg/l	1 %	Median
Sulphate	3,76 mg/L SO4	250 mg/l	2 %	Median
Taste	0 tasso diluz.	accettabile per i consumatori, senza variazioni anomale	—	Median
Temperature	13,0 °C	—	—	Median
Total organic carbon (TOC)	0,96 mg/L C	senza variazioni anomale	—	Median
Turbidity	<0,5 NTU below limit of quantification	accettabile per i consumatori, senza variazioni anomale	—	Median

Treatment substances (1)

Treatment substances – Zona 3 Acqua Marcia
Parameter	Value	Parametric value	Share of the parametric value	Reference
Free chlorine	0,19 mg/L Cl2	—	—	Median

Further parameters (13)

Further parameters – Zona 3 Acqua Marcia
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	319 mg/L CaCO3	—	—	Median
Beryllium	<0,2 µg/L Be below limit of quantification	—	—	Median
Bromide	<50 µg/L Br below limit of quantification	—	—	Median
Calcium	89,45 mg/L Ca	—	—	Median
Dry residue	373 mg/L	—	—	Median
Hydrogen carbonate	389 mg/L HCO3	—	—	Median
Magnesium	22,35 mg/L Mg	—	—	Median
Phosphate	<50 µg/L P2O5 below limit of quantification	—	—	Median
Potassium	0,86 mg/L K	—	—	Median
Silicate / silicic acid	3,5 mg/L SiO2	—	—	Median
Thallium	<0,2 µg/L Tl below limit of quantification	—	—	Median
Total hardness	31,6 °F	—	—	Median
Vanadium	1,70 µg/L V	0.14 mg/l	—	Median

Source: https://www.aceaato2.a-acqua.it/content/dam/acea-ato2/pdf/it/mappe-qualita/guidonia_montecelio_zona_3_acqua_marcia.pdf · luglio 2026 · luglio 2026 · retrieved on 08/07/2026

ZONA 4 ACQUA MARCIA + ACQUORIA

ACEA ATO 2 S.p.A.

Water hardness

19.8 °dH

Key values ZONA 4 ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sum of PFAS	<0,10 µg/L below limit of quantification	0.1 µg/l	< 100 % *	Median
Nitrate	2,23 mg/L NO3	50 mg/l	4 %	Median
Lead	<0,2 µg/L Pb below limit of quantification	10 µg/l	—	Median
Escherichia coli (E. coli)	Conforme MPN/100 mL	0/100 ml	—	Median
Sulphate	20,26416667 mg/L SO4	250 mg/l	8 %	Median
Sodium	7,0 mg/L Na	200 mg/l	3 %	Median

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (2)

Microbiology – ZONA 4 ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Escherichia coli (E. coli)	Conforme MPN/100 mL	0/100 ml	—	Median
Intestinal enterococci	Conforme N/100 mL	0/100 ml	—	Median

Chemical parameters (28)

Chemical parameters – ZONA 4 ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
1,2-dichloroethane	<0,1 µg/L below limit of quantification	3 µg/l	< 3 % *	Median
Acrylamide	<0,03 µg/L below limit of quantification	0.1 µg/l	< 30 % *	Median
Antimony	<1,0 µg/L Sb below limit of quantification	10 µg/l	—	Median
Arsenic	<1,0 µg/L As below limit of quantification	10 µg/l	< 10 % *	Median
Bisphenol A	<0,25 µg/L below limit of quantification	2.5 µg/l	< 10 % *	Median
Boron	<0,02 mg/L B below limit of quantification	1.5 mg/l	—	Median
Cadmium	<0,2 µg/L Cd below limit of quantification	5 µg/l	—	Median
Chlorate	<0,05 mg/L ClO3 below limit of quantification	0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid	—	Median
Chlorite	<0,05 mg/L ClO2 below limit of quantification	0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid	—	Median
Chromium	<5,0 µg/L Cr below limit of quantification	25 µg/l	—	Median
Copper	<0,001 mg/L Cu below limit of quantification	2 mg/l	—	Median
Cyanide	<10 µg/L CN below limit of quantification	50 µg/l	—	Median
Epichlorohydrin	<0,05 µg/L below limit of quantification	0.1 µg/l	< 50 % *	Median
Fluoride	0,14 mg/L	1.5 mg/l	9 %	Median
Haloacetic acids (HAA)	- µg/L not determined	60 µg/l	—	Median
Lead	<0,2 µg/L Pb below limit of quantification	10 µg/l	—	Median
Mercury	<0,2 µg/L Hg below limit of quantification	1 µg/l	—	Median
Nickel	<2,0 µg/L Ni below limit of quantification	20 µg/l	—	Median
Nitrate	2,23 mg/L NO3	50 mg/l	4 %	Median
Nitrite	<0,05 mg/L NO2 below limit of quantification	0.5 mg/l	< 10 % *	Median
Pesticides — Total	- µg/L not determined	0.5 µg/l	—	Median
Polycyclic aromatic hydrocarbons	- µg/L not determined	0.1 µg/l	—	Median
Selenium	<1,0 µg/L Se below limit of quantification	20 µg/l	—	Median
Tetrachloroethene	<1,0 µg/L below limit of quantification	—	—	Median
Trichloroethene	<1,0 µg/L below limit of quantification	—	—	Median
Trihalomethanes — Total	<1,0 µg/L below limit of quantification	30 µg/l	< 3 % *	Median
Uranium	1,00 µg/L U	30 µg/l	—	Median
Vinyl chloride	<0,1 µg/L below limit of quantification	0.5 µg/l	< 20 % *	Median

PFAS (1)

PFAS – ZONA 4 ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sum of PFAS	<0,10 µg/L below limit of quantification	0.1 µg/l	< 100 % *	Median

Indicator parameters (16)

Indicator parameters – ZONA 4 ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	3,6 µg/L Al	0.2 mg/l	—	Median
Ammonium	<0,1 mg/L NH4 below limit of quantification	0.5 mg/l	< 20 % *	Median
Chloride	11,5 mg/L Cl	250 mg/l	5 %	Median
Coliform bacteria	Conforme MPN/100 mL	0/100 ml	—	Median
Colour	Incolore Scala Pt/C	accettabile per i consumatori, senza variazioni anomale	—	Median
Conductivity (25 °C)	598 µS/cm	2,500 µS/cm	—	Median
Iron	13,4 µg/L Fe	0.2 mg/l	—	Median
Manganese	0,44 µg/L Mn	50 µg/l	—	Median
Odour	0 Diluiz. 25	accettabile per i consumatori, senza variazioni anomale	—	Median
pH	7,59 pH	6,5–9,5	—	Median
Sodium	7,0 mg/L Na	200 mg/l	3 %	Median
Sulphate	20,26416667 mg/L SO4	250 mg/l	8 %	Median
Taste	0 tasso diluz.	accettabile per i consumatori, senza variazioni anomale	—	Median
Temperature	11,5 °C	—	—	Median
Total organic carbon (TOC)	0,51 mg/L C	senza variazioni anomale	—	Median
Turbidity	<0,5 NTU below limit of quantification	accettabile per i consumatori, senza variazioni anomale	—	Median

Treatment substances (1)

Treatment substances – ZONA 4 ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Free chlorine	0,19 mg/L Cl2	—	—	Median

Further parameters (13)

Further parameters – ZONA 4 ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	343 mg/L CaCO3	—	—	Median
Beryllium	<0,2 µg/L Be below limit of quantification	—	—	Median
Bromide	<50 µg/L Br below limit of quantification	—	—	Median
Calcium	102,83 mg/L Ca	—	—	Median
Dry residue	432,3333333 mg/L	—	—	Median
Hydrogen carbonate	418 mg/L HCO3	—	—	Median
Magnesium	23,62 mg/L Mg	—	—	Median
Phosphate	<50 µg/L P2O5 below limit of quantification	—	—	Median
Potassium	1,02 mg/L K	—	—	Median
Silicate / silicic acid	4,2 mg/L SiO2	—	—	Median
Thallium	<0,2 µg/L Tl below limit of quantification	—	—	Median
Total hardness	35,4 °F	—	—	Median
Vanadium	1,82 µg/L V	0.14 mg/l	—	Median

Source: https://www.aceaato2.a-acqua.it/content/dam/acea-ato2/pdf/it/mappe-qualita/guidonia_montecelio_zona_4_acqua_marcia_%2B_acquoria.pdf · luglio 2026 · luglio 2026 · retrieved on 08/07/2026

ZONA 5 PC + ACQUA MARCIA + ACQUORIA

ACEA ATO 2 S.p.A.

Water hardness

19.7 °dH

Key values ZONA 5 PC + ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sum of PFAS	<0,10 µg/L below limit of quantification	0.1 µg/l	< 100 % *	Median
Nitrate	2,55 mg/L NO3	50 mg/l	5 %	Median
Lead	<0,2 µg/L Pb below limit of quantification	10 µg/l	—	Median
Escherichia coli (E. coli)	Conforme MPN/100 mL	0/100 ml	—	Median
Sulphate	20,46583333 mg/L SO4	250 mg/l	8 %	Median
Sodium	6,0 mg/L Na	200 mg/l	3 %	Median

Show all recorded parameters (61 — most recent value per parameter)

Microbiology (2)

Microbiology – ZONA 5 PC + ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Escherichia coli (E. coli)	Conforme MPN/100 mL	0/100 ml	—	Median
Intestinal enterococci	Conforme N/100 mL	0/100 ml	—	Median

Chemical parameters (28)

Chemical parameters – ZONA 5 PC + ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
1,2-dichloroethane	<0,1 µg/L below limit of quantification	3 µg/l	< 3 % *	Median
Acrylamide	<0,03 µg/L below limit of quantification	0.1 µg/l	< 30 % *	Median
Antimony	<1,0 µg/L Sb below limit of quantification	10 µg/l	—	Median
Arsenic	<1,0 µg/L As below limit of quantification	10 µg/l	< 10 % *	Median
Bisphenol A	<0,25 µg/L below limit of quantification	2.5 µg/l	< 10 % *	Median
Boron	<0,02 mg/L B below limit of quantification	1.5 mg/l	—	Median
Cadmium	<0,2 µg/L Cd below limit of quantification	5 µg/l	—	Median
Chlorate	<0,05 mg/L ClO3 below limit of quantification	0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid	—	Median
Chlorite	<0,05 mg/L ClO2 below limit of quantification	0,25 — bzw. 0,70 bei Desinfektion mit Chlordioxid	—	Median
Chromium	<5,0 µg/L Cr below limit of quantification	25 µg/l	—	Median
Copper	<0,001 mg/L Cu below limit of quantification	2 mg/l	—	Median
Cyanide	<10 µg/L CN below limit of quantification	50 µg/l	—	Median
Epichlorohydrin	<0,05 µg/L below limit of quantification	0.1 µg/l	< 50 % *	Median
Fluoride	0,13 mg/L	1.5 mg/l	9 %	Median
Haloacetic acids (HAA)	- µg/L not determined	60 µg/l	—	Median
Lead	<0,2 µg/L Pb below limit of quantification	10 µg/l	—	Median
Mercury	<0,2 µg/L Hg below limit of quantification	1 µg/l	—	Median
Nickel	<2,0 µg/L Ni below limit of quantification	20 µg/l	—	Median
Nitrate	2,55 mg/L NO3	50 mg/l	5 %	Median
Nitrite	<0,05 mg/L NO2 below limit of quantification	0.5 mg/l	< 10 % *	Median
Pesticides — Total	- µg/L not determined	0.5 µg/l	—	Median
Polycyclic aromatic hydrocarbons	- µg/L not determined	0.1 µg/l	—	Median
Selenium	<1,0 µg/L Se below limit of quantification	20 µg/l	—	Median
Tetrachloroethene	<1,0 µg/L below limit of quantification	—	—	Median
Trichloroethene	<1,0 µg/L below limit of quantification	—	—	Median
Trihalomethanes — Total	<1,0 µg/L below limit of quantification	30 µg/l	< 3 % *	Median
Uranium	1,00 µg/L U	30 µg/l	—	Median
Vinyl chloride	<0,1 µg/L below limit of quantification	0.5 µg/l	< 20 % *	Median

PFAS (1)

PFAS – ZONA 5 PC + ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Sum of PFAS	<0,10 µg/L below limit of quantification	0.1 µg/l	< 100 % *	Median

Indicator parameters (16)

Indicator parameters – ZONA 5 PC + ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Aluminium	2,9 µg/L Al	0.2 mg/l	—	Median
Ammonium	<0,1 mg/L NH4 below limit of quantification	0.5 mg/l	< 20 % *	Median
Chloride	9,9 mg/L Cl	250 mg/l	4 %	Median
Coliform bacteria	Conforme MPN/100 mL	0/100 ml	—	Median
Colour	Incolore Scala Pt/C	accettabile per i consumatori, senza variazioni anomale	—	Median
Conductivity (25 °C)	594 µS/cm	2,500 µS/cm	—	Median
Iron	12,3 µg/L Fe	0.2 mg/l	—	Median
Manganese	0,34 µg/L Mn	50 µg/l	—	Median
Odour	0 Diluiz. 25	accettabile per i consumatori, senza variazioni anomale	—	Median
pH	7,56 pH	6,5–9,5	—	Median
Sodium	6,0 mg/L Na	200 mg/l	3 %	Median
Sulphate	20,46583333 mg/L SO4	250 mg/l	8 %	Median
Taste	0 tasso diluz.	accettabile per i consumatori, senza variazioni anomale	—	Median
Temperature	12,5 °C	—	—	Median
Total organic carbon (TOC)	0,50 mg/L C	senza variazioni anomale	—	Median
Turbidity	<0,5 NTU below limit of quantification	accettabile per i consumatori, senza variazioni anomale	—	Median

Treatment substances (1)

Treatment substances – ZONA 5 PC + ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Free chlorine	0,16 mg/L Cl2	—	—	Median

Further parameters (13)

Further parameters – ZONA 5 PC + ACQUA MARCIA + ACQUORIA
Parameter	Value	Parametric value	Share of the parametric value	Reference
Acid capacity to pH 4.3	341 mg/L CaCO3	—	—	Median
Beryllium	<0,2 µg/L Be below limit of quantification	—	—	Median
Bromide	<50 µg/L Br below limit of quantification	—	—	Median
Calcium	104,97 mg/L Ca	—	—	Median
Dry residue	426,8333333 mg/L	—	—	Median
Hydrogen carbonate	416 mg/L HCO3	—	—	Median
Magnesium	21,69 mg/L Mg	—	—	Median
Phosphate	<50 µg/L P2O5 below limit of quantification	—	—	Median
Potassium	1,08 mg/L K	—	—	Median
Silicate / silicic acid	4,7 mg/L SiO2	—	—	Median
Thallium	<0,2 µg/L Tl below limit of quantification	—	—	Median
Total hardness	35,1 °F	—	—	Median
Vanadium	1,55 µg/L V	0.14 mg/l	—	Median

Source: https://www.aceaato2.a-acqua.it/content/dam/acea-ato2/pdf/it/mappe-qualita/guidonia_montecelio_zona_5_pc_%2B_acqua_marcia_%2B_acquoria.pdf · luglio 2026 · luglio 2026 · retrieved on 08/07/2026

How to read the share of the parametric value

12 % Share of the parametric value. The proportion of the permitted maximum that the measured value uses — here 12 %, so just over an eighth.

< 10 % * Below the limit of quantification. The substance was not detectable. The mark shows where the detection limit lies relative to the parametric value — the actual share of the parametric value is below that.

Several samples per year: for chemical parameters the mean value is given, for microbiological ones the highest measured value. There the parametric value is zero — a single finding would disappear in the average, and it is precisely that finding which is the information. Which reference applies is stated in the last column of the table.

Legal basis: Art. 18 D.Lgs. 18/2023 as amended by D.Lgs. 102/2025 (transposition of EU Directive 2020/2184). The values are not official — the publication of the Gestore, to which every row links, remains authoritative. Assignment of the comune: information in the analysis document, resolved against the municipality list of ISTAT (territorial status 01.01.2026, CC BY 4.0).