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

44

0

0

2.00

2.05

4.00

Turbidity

FTU

4

44

0

0

0.12

0.12

0.15

Odour (quantitative)

Dil Number

0

44

0

0

<0.00

<0.00

0.00

Taste (quantitative)

Dil Number

0

43

0

0

<0.00

<0.00

0.00

Sodium

mg/l

200

7

0

0

14.70

21.01

30.70

Nitrate (as NO3)

mg/l

50

7

0

0

26.70

35.64

41.10

Nitrite (as NO2)

mg/l

0.1

7

0

0

<0.01

<0.01

0.01

Nitrate/Nitrite Ratio

mg/l

1

7

0

0

0.53

0.71

0.82

Aluminium

ug/l

200

44

0

0

6.00

10.99

43.40

Iron

ug/l

200

44

0

0

7.30

7.44

11.30

Manganese

ug/l

50

44

0

0

1.70

1.70

1.70

Copper (New Reg Limit)

mg/l

2

7

0

0

0.01

0.02

0.06

Fluoride

mg/l

1.5

7

0

0

0.41

0.77

1.00

Arsenic (New Regs Limit)

ug/l

10

7

0

0

1.00

2.29

3.00

Cadmium

ug/l

5

7

0

0

0.12

0.12

0.12

Chromium

ug/l

50

7

0

0

<0.70

<0.70

0.90

Nickel (New Reg Limit)

ug/l

20

7

0

0

<0.80

0.90

1.60

Lead (New Reg Limit)

ug/l

10

7

0

0

0.90

0.90

0.90

Antimony (New Reg Limit)

ug/l

5

7

0

0

0.20

0.20

0.20

Selenium

ug/l

10

7

0

0

0.80

0.80

0.80

PAH

ug/l

0.1

6

0

0

<0.00

<0.00

0.00

Escherichia coli

No./100ml

0

110

0

0

<0.00

<0.00

0.00

Intestinal Enterococci

cfu/100ml

0

7

0

0

<0.00

<0.00

0.00

Boron (New Reg Limit)

mg/l

1

7

0

0

0.04

0.04

0.04

Benzo(a)pyrene

ug/l

0.01

6

0

0

0.00

0.00

0.00

Trihalomethanes (total)

ug/l

100

7

0

0

17.00

31.47

54.60

Bromate

ug/l

10

7

0

0

0.80

0.81

0.90



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

-

44

0

0

7.00

7.42

7.90

Sulphate (as SO4)

mg/l

250

7

0

0

20.60

28.00

42.80

Ammonium (as NH4)

mg/l

0.5

44

0

0

<0.03

0.02

0.02

Total coliforms

No./100ml

0

110

0

0

<0.00

0.00

0.00

3 day count,22 deg C

cfu/ml

50

44

0

0

<0.00

4.18

82.00

Free chlorine

mg/l

-

110

0

0

0.03

0.17

0.50

Total chlorine

mg/l

-

110

0

0

0.03

0.26

0.74

Conductivity

uS/cm

2500

44

0

0

323.00

411.23

509.00

Chloride

mg/l

250

7

0

0

37.00

44.00

53.00


*All of the samples collected from this zone in 2023 complied with the Water Supply (Water Quality) (Amendment) Regulations 2016. 
Supplies to this zone are fluoridated up to a level of 1.5 mg/l.


Water hardness
Average of Ca Average of Mg mg/l or ppm CaCO3 Degrees Clark (*0.07) Degrees French (*0.10) Degrees German (*0.056)
46.68 8.99 153.5 10.7 15.4 8.6

Water quality terms

Find out what the technical terms used in the water quality reports mean.