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 |
30 |
0 |
0 |
2.00 |
2.07 |
4.00 |
|
Turbidity |
FTU |
4 |
30 |
0 |
0 |
0.12 |
0.16 |
0.63 |
|
Odour (quantitative) |
Dil Number |
0 |
30 |
0 |
0 |
<0.00 |
<0.00 |
0.00 |
|
Taste (quantitative) |
Dil Number |
0 |
30 |
0 |
0 |
<0.00 |
<0.00 |
0.00 |
|
Sodium |
mg/l |
200 |
7 |
0 |
0 |
19.70 |
33.67 |
48.20 |
|
Nitrate (as NO3) |
mg/l |
50 |
7 |
0 |
0 |
<1.03 |
3.72 |
9.90 |
|
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 |
<0.03 |
0.08 |
0.20 |
|
Aluminium |
ug/l |
200 |
30 |
0 |
0 |
6.00 |
6.56 |
10.20 |
|
Iron |
ug/l |
200 |
30 |
1 |
3.33 |
7.30 |
19.78 |
316.00 |
|
Manganese |
ug/l |
50 |
30 |
0 |
0 |
1.70 |
1.90 |
7.00 |
|
Copper (New Reg Limit) |
mg/l |
2 |
7 |
0 |
0 |
0.01 |
0.04 |
0.10 |
|
Fluoride |
mg/l |
1.5 |
7 |
0 |
0 |
0.60 |
0.89 |
1.01 |
|
Arsenic (New Regs Limit) |
ug/l |
10 |
7 |
0 |
0 |
1.00 |
1.49 |
2.60 |
|
Cadmium |
ug/l |
5 |
7 |
0 |
0 |
0.12 |
0.12 |
0.12 |
|
Chromium |
ug/l |
50 |
7 |
0 |
0 |
<0.70 |
<0.70 |
0.70 |
|
Nickel (New Reg Limit) |
ug/l |
20 |
7 |
0 |
0 |
<0.80 |
1.70 |
7.50 |
|
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 |
0.80 |
2.10 |
|
Selenium |
ug/l |
10 |
7 |
0 |
0 |
0.80 |
0.80 |
0.80 |
|
PAH |
ug/l |
0.1 |
7 |
0 |
0 |
<0.00 |
<0.00 |
0.00 |
|
Escherichia coli |
No./100ml |
0 |
82 |
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 |
0.05 |
0.07 |
0.09 |
|
Benzo(a)pyrene |
ug/l |
0.01 |
7 |
0 |
0 |
0.00 |
0.00 |
0.00 |
|
Trihalomethanes (total) |
ug/l |
100 |
8 |
0 |
0 |
2.15 |
23.80 |
48.70 |
|
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 |
- |
30 |
0 |
0 |
7.30 |
7.50 |
7.90 |
|
|
Sulphate (as SO4) |
mg/l |
250 |
7 |
0 |
0 |
90.60 |
129.49 |
157.00 |
|
Ammonium (as NH4) |
mg/l |
0.5 |
30 |
0 |
0 |
<0.03 |
0.02 |
0.02 |
|
Total coliforms |
No./100ml |
0 |
82 |
0 |
0 |
<0.00 |
0.00 |
0.00 |
|
3 day count,22 deg C |
cfu/ml |
50 |
30 |
0 |
0 |
<0.00 |
1.03 |
9.00 |
|
Free chlorine |
mg/l |
- |
82 |
0 |
0 |
0.03 |
0.13 |
0.43 |
|
Total chlorine |
mg/l |
- |
82 |
0 |
0 |
0.05 |
0.23 |
0.63 |
|
Conductivity |
uS/cm |
2500 |
30 |
0 |
0 |
456.00 |
728.40 |
934.00 |
|
Chloride |
mg/l |
250 |
7 |
0 |
0 |
38.00 |
56.43 |
70.00 |
*With the exception of the Iron parameter all of the samples collected from this zone in 2022 complied with the Water Supply (Water Quality) (Amendment) Regulations 2016. The unsatisfactory samples were resampled and were found to comply with the regulations.
Supplies to this zone are fluoridated up to a level of 1mg/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) |
| 75.13 | 22.86 | 281.7 | 19.7 | 28.2 | 15.8 |
Water quality terms
Find out what the technical terms used in the water quality reports mean.