IWNL (Independent Water Networks Ltd)

Report Data Range: For the whole year 2021

Table 9: Quality of water at consumer’s tap (zones) – European Standards

Parameter Name

Parameter Code

Prescribed Concentration or Value

Total Number of Tests

Tests Failed

1 Percentile (representing a minimum)

99 Percentile (representing a maximum)

No. of zones failing standard

1 2-Dichloroethane (Total)

F001

3 µg/l

101

0

<0.16

<0.16

0

Antimony

B008A

5 µg Sb/l

117

0

0.0218

0.5264

0

Arsenic (Total)

B001A

10 µg As/l

117

0

0.0918

1.9064

0

Benzene (Total)

F002

1 µg/l

101

0

<0.06

<0.09

0

Benzo[a]Pyrene (Total)

D007

0.01 µg/l

101

0

<0.00057

<0.000962

0

Boron

D005A

1 mg B/l

117

0

0.0101198

0.12732

0

Bromate

F003

10 µg BrO3/l

117

0

<0.15

5.36

0

Cadmium (Total)

B002

5 µg Cd/l

117

0

<0.01

0.3782

0

Chromium (Total)

B004

50 µg Cr/l

117

0

<0.04

5.753

0

Copper (Total)

A024A

2 mg Cu/l

117

0

<0.00049

0.53134

0

Cyanide (Total)

B003

50 µg CN/l

117

0

<1.2

<12.47

0

E coli (faecal coliforms Confirmed)

C002

0 number/100 ml

311

0

0

0

0

Enterococci (Confirmed)

C003

0 number/100 ml

111

0

0

0

0

Fluoride (Total)

A027

1.5 mg F/l

117

0

<0.0418

1.1722

0

Lead (10 – will apply 25.12.2013)

B007B

10 µg Pb/l

117

0

<0.04

3.2464

0

Mercury (Total)

B005

1 µg Hg/l 

117

0

<0.06

<0.06

0

Nickel (Total) 

B006A 

20 µg Ni/l

117

2

<0.2106

65.26

2

Nitrate (Total)

A012

50 mg NO3/l

116

0

<2.11

43.558

0

Nitrite – Consumer’s Taps

A013A

0.5 mg NO2/l

116

0

0.00034

0.12267

0

Nitrite/Nitrate formula

A013C

1 mg/l

116

0

0

0.8715

0

Pesticides (Total by Calculation)

B010

0.5 µg/l

58

0

0

0.065

0

Pesticides Metaldehyde

P226

0.1 µg/l 

58

0

<0.007

0.055

0

Polycyclic Aromatic Hydrocarbons (Total by Calculation)

B011F

0.1 µg/l

101

0

0

0.0698

0

Radon

F101

100 Bq/l

30

0

<1.1

3.33

0

Selenium (Total)

B009

10 µg Se/l

117

0

<0.08

1.9906

0

Trichloroethene & Tetrachloroethene – Sum Of 2 Substances (Total by Calculation)

D009B

10 µg/l

101

0

0

0.4802

0

Trihalomethanes (Total by Calculation)

D011

100 µg/l

101

0

2.8158

68.8084

0

Totals

3,043

2

Table 10: Quality of water at consumer’s tap (zones) – National Standards

Parameter Name

Parameter Code

Prescribed Concentration or Value

Total Number of Tests

Tests Failed

1 percentile (representing a minimum)

99 percentile (representing a maximum)

No. of zones failing standard

Aluminium (Total)

A021

200 µg Al/l

117

0

<6.9

141.01

0

Colour

A001

20 mg/l Pt/Co

128

0

<2.9

<8.68

0

Iron (Total)

A022

200 µg Fe/l

117

0

<3.72

164.28

0

Manganese (Total)

A023

50 µg Mn/l

117

0

<0.3

9.6134

0

Odour

A003

0 Dilution number at 25°C

129

0

0

0

0

Sodium (Total)

A009

200 mg Na/l

117

0

3.9636

77.402

0

Taste (Taste Quant)

A004

0 Dilution number at 25°C

128

0

0

0

0

Tetrachloromethane (Total)

D008

3 µg/l

101

0

<0.13

<0.2286

0

Turbidity

A002

4 NTU

128

1

<0.13

4.2587

1

Totals

1,082

1

Table 11: Quality of water at consumer’s tap (zones) – Additional Monitoring Requirements

Parameter Name

Parameter Code

Prescribed Concentration or Value

Total Number of Tests

Tests exceeding specification

1 percentile (representing a minimum)

99 percentile (representing a maximum)

Ammonium (Total)

A014

0.5 mg NH4/l

128

0

<0.008

0.23423

Chloride

D002A

250 mg Cl/l

128

0

7.116

95.524

Clostridum Perfringens (Sulphite-reducing Clostridia) (Confirmed)

C004A

0 number/100 ml

129

0

0

0

Coliform Bacteria (Indicator)

C001A

0 number/100 ml

310

3

0

1

Colony Counts After 3 Days At 22øc (Colony Counts)

C007

No abnormal change

128

N/A

0

210

Colony Counts After 48 Hours At 37øc (Colony Counts)

C013

No abnormal change

1

N/A

1

1

Conductivity (Electrical Conductivity)

D001

2500 µS/cm at 20°C

128

0

154.03

930.21

Gross Alpha

F004

0.1 Bq/l

34

0

<0.012

0.093

Gross Beta

F005

1 Bq/l

34

0

0.013

0.261

Hydrogen ion (pH) – Indicator (Hydrogen ion) (pH)

A006

6.5 – 9.5 pH Value

128

0

6.8567

8.3908

Residual Disinfectant – Free

C009

No abnormal change

314

N/A

0.02

0.7325

Residual Disinfectant – Total

C010

No abnormal change

314

N/A

0.1

0.9885

Sulphate

A007

250 mg SO4/l

128

0

9.3098

195.07

Total Organic Carbon

A017

No abnormal change

128

N/A

<0.7

4.2927

Tritium

F006

100 Bq/l

25

0

<5.6

<10

Totals

2,057

3

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