My water supply

We’re committed to delivering high-quality drinking water to our customers. Each year we carry out thousands of tests on samples we have taken from treatment works, reservoirs and homes across the region.

The samples we take are analysed in a UKAS accredited laboratory to ensure they comply with drinking water safety standards.

Schedule 1 Parameters

	Units	PCV	Number of Samples	Number of Samples contravening PCV	% No. of samples contravening PCV	Min	Mean	Max
Colour	mg/l Pt/Co	20	2	0	0	<1.00	<1.00	<1.00
Turbidity	FTU	4	2	0	0	<0.13	<0.13	<0.13
Odour	Dil Number	0	2	0	0	0	0	0
Taste	Dil Number	0	2	0	0	0	0	0
Sodium	mg/l	200	1	0	0	9.7	9.7	9.7
Nitrate (as NO3)	mg/l	50	1	0	0	31	31	31
Nitrite (as NO2)	mg/l	0.1	2	0	0	<0.01	<0.01	<0.01
Nitrate/Nitrite Ratio	mg/l	1	1	0	0	0.62	0.62	0.62
Aluminium	ug/l	200	1	0	0	<6.00	<6.00	<6.00
Iron	ug/l	200	1	0	0	<4.00	<4.00	2
Manganese	ug/l	50	1	0	0	<1.70	<1.70	<1.70
Copper	mg/l	2	1	0	0	<0.008	<0.008	<0.008
Fluoride	mg/l	1.5	1	0	0	0.19	0.19	0.19
Arsenic	ug/l	10	1	0	0	<1.00	<1.00	<1.00
Cadmium	ug/l	5	1	0	0	<0.12	<0.12	<0.12
Chromium	ug/l	50	1	0	0	<0.70	<0.70	<0.70
Nickel	ug/l	20	1	0	0	2.6	2.6	2.6
Lead	ug/l	10	1	0	0	<0.90	<0.90	<0.90
Antimony	ug/l	5	1	0	0	<0.20	<0.20	<0.20
Selenium	ug/l	10	1	0	0	<0.90	<0.90	<0.90
PAH	ug/l	0.1	1	0	0	0	0	0
Escherichia coli	No./100ml	0	5	0	0	0	0	0
Intestinal Enterococci	cfu/100ml	0	1	0	0	0	0	0
Boron	mg/l	1	1	0	0	<0.04	<0.04	<0.04
Benzo(a)pyrene	ug/l	0.01	1	0	0	<0.003	<0.003	<0.003
Trihalomethanes (total)	ug/l	100	1	0	0	8.31	8.31	8.31

Indicator parameters

	Units	PCV	Number of samples	Number of Samples contravening PCV	% No. of samples contravening PCV	Minimum	Mean	Maximum
pH (New Reg Limit) Env		-	2	0	0	7.30	7.40	7.50
Sulphate (as SO4)	mg/l	250	1	0	0	24.50	24.50	24.50
Ammonium (as NH4)	mg/l	0.5	2	0	0	<0.03	<0.03	<0.03
Total coliforms	No./100ml	0	5	0	0	0	0	0
3 day count,22 deg C	cfu/ml	-	2	0	0	0	0	0
Free chlorine	mg/l	-	5	0	0	0.06	0.07	0.08
Conductivity	uS/cm	2500	2	0	0	555	614	673
Chloride	mg/l	250	1	0	0	20	20	20

* All of the samples collected from this zone in 2020 complied with the Water Supply (Water Quality) (Amendment) Regulations 2018.

Water hardness

Average of Mg	Average of Ca	mg/l or ppm CaCO3	*Degrees Clark (0.07)**	*Degrees French (0.10)**	*Degrees German (0.056)**
2.80	110.00	286.2	20.0	28.6	16.0