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

56

0

0

<1.70

<1.70

2.00

Turbidity

FTU

4

56

0

0

0.10

0.11

0.12

Odour (quantitative)

Dil Number

0

56

0

0

0

0

0

Taste (quantitative)

Dil Number

0

56

0

0

0

0

0

Sodium

mg/l

200

10

0

0

9.60

11.81

13.50

Nitrate (as NO3)

mg/l

50

10

0

0

37.70

39.72

42.30

Nitrite (as NO2)

mg/l

0.1

10

0

0

<0.01

<0.01

0.01

Nitrate/Nitrite Ratio

mg/l

1

10

0

0

0.75

0.79

0.85

Aluminium

ug/l

200

10

0

0

6.00

6.00

6.00

Iron

ug/l

200

10

0

0

4.40

7.01

7.30

Manganese

ug/l

50

10

0

0

1.70

1.70

1.70

Copper (New Reg Limit)

mg/l

2

10

0

0

0.01

0.24

1.06

Fluoride

mg/l

1.5

10

0

0

0.14

0.16

0.18

Arsenic (New Regs Limit)

ug/l

10

10

0

0

1.00

1.00

1.00

Cadmium

ug/l

5

10

0

0

0.12

0.12

0.12

Chromium

ug/l

50

10

0

0

<0.70

<0.70

<0.70

Nickel (New Reg Limit)

ug/l

20

10

0

0

1.10

1.63

2.10

Lead (New Reg Limit)

ug/l

10

10

0

0

<0.90

1.04

2.30

Antimony (New Reg Limit)

ug/l

5

10

0

0

0.20

0.20

0.20

Selenium

ug/l

10

10

0

0

0.80

0.83

0.90

PAH

ug/l

0.1

10

0

0

0

0

0

Escherichia coli

No./100ml

0

172

0

0

0

0

0

Intestinal Enterococci

cfu/100ml

0

10

0

0

0

0

0

Boron (New Reg Limit)

mg/l

1

10

0

0

0.04

0.04

0.04

Benzo(a)pyrene

ug/l

0.01

10

0

0

<0.003

<0.003

<0.003

Trihalomethanes (total)

ug/l

100

10

0

0

7.21

8.64

10.20



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

 

-

56

0

0

7.30

7.44

7.90

Sulphate (as SO4)

mg/l

250

10

0

0

28.00

30.42

33.20

Ammonium (as NH4)

mg/l

0.5

56

0

0

<0.03

<0.03

<0.03

Total coliforms

No./100ml

0

172

0

0

0

0

0

3 day count,22 deg C

cfu/ml

50

56

0

0

0

2

55

Free chlorine

mg/l

-

172

0

0

0.03

0.06

0.17

Conductivity

uS/cm

2500

56

0

0

568.00

593.45

640.00

Chloride

mg/l

250

10

0

0

32.00

34.50

39.00


* All of the samples collected from this zone in 2022 complied with the Water Supply (Water Quality) (Amendment) Regulations 2016. 

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)
3.94 113.32 299.2 20.9 29.9 16.8



Water quality terms

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