TMS (Thames Water Utilities Ltd)

Report Data Range: For the whole year 2021

Table 1: Quality of water leaving service treatment works – 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 works with failures
Nitrite (Total)	A013B	0.1 mg NO2/l	4,285	0	<0.0018	0.011542	0
Totals			4,285	0

Table 2: Quality of water leaving service treatment works – 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 works with failures
E coli (faecal coliforms Confirmed)	C002	0 number/100 ml	17,595	0	0	0	0
Total Coliforms (Confirmed)	C001	0 number/100 ml	17,595	6	0	0	6
Totals			35,190	6

Table 3: Quality of water leaving service treatment works – 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)
Colony Counts After 3 Days At 22øc (Colony Counts)	C007	No abnormal change	17,590	N/A	0	6
Residual Disinfectant – Total	C010	No abnormal change	17,618	N/A	0.37	1.02
Turbidity – Indicator	A002A	1 NTU	17,596	4	<0.12	<0.17
Totals			52,804	4

Table 4: Quality of water leaving service reservoirs – 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 reservoirs failing standard
E coli (faecal coliforms Confirmed)	C002	0 number/100 ml	19,216	1	0	0	1
Total Coliforms (Confirmed)	C001	0 number/100 ml	19,217	5	0	0	0
Totals			38,433	6

Table 5: Quality of water leaving service reservoirs – 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)
Colony Counts After 3 Days At 22øc (Colony Counts)	C007	No abnormal change	19,210	N/A	0	24
Residual Disinfectant – Total	C010	No abnormal change	19,238	N/A	0.14	0.79
Totals			38,448	0

Table 6: Quality of water leaving bulk supply points – 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 supply point with failures
Bromate	F003	10 µg BrO3/l	711	0	<0.8	3.464	0
Cyanide (Total)	B003	50 µg CN/l	710	0	<1	4.423	0
Mercury (Total)	B005	1 µg Hg/l	714	0	<0.07	<0.07	0
Pesticides (Total by Calculation)	B010	0.5 µg/l	737	0	0	0.076	0
Pesticides 2 4-D	P020	0.1 µg/l	712	0	<0.017	<0.017	0
Pesticides 2 4-DB	P082	0.1 µg/l	712	0	<0.016	<0.016	0
Pesticides Atrazine	P004	0.1 µg/l	715	0	<0.005	0.036	0
Pesticides Bentazone	P006	0.1 µg/l	712	0	<0.012	<0.012	0
Pesticides Bromoxynil	P008	0.1 µg/l	712	0	<0.019	<0.019	0
Pesticides Carbendazim (Total)	P150	0.1 µg/l	715	0	<0.02	<0.02	0
Pesticides Carbetamide	P010	0.1 µg/l	715	0	<0.005	<0.007	0
Pesticides Chlortoluron	P014	0.1 µg/l	715	0	<0.004	<0.006	0
Pesticides Clopyralid	P018	0.1 µg/l	712	0	<0.022	<0.022	0
Pesticides Dicamba	P025	0.1 µg/l	712	0	<0.022	<0.022	0
Pesticides Dichlorprop	P026	0.1 µg/l	712	0	<0.012	<0.012	0
Pesticides Diuron	P032	0.1 µg/l	715	0	<0.005	0.02084	0
Pesticides Flufenacet	P230	0.1 µg/l	179	0	<0.004	0.01	0
Pesticides Fluroxypyr	P040	0.1 µg/l	712	0	<0.015	<0.015	0
Pesticides Isoproturon	P048	0.1 µg/l	715	0	<0.004	<0.005	0
Pesticides Linuron	P051	0.1 µg/l	715	0	<0.004	<0.006	0
Pesticides MCPA 4-chloro-o-tolyloxyacetic acid	P054	0.1 µg/l	712	0	<0.02	<0.02	0
Pesticides MCPP (Mecoprop)	P053	0.1 µg/l	712	0	<0.014	<0.014	0
Pesticides Metaldehyde	P226	0.1 µg/l	714	0	<0.014	0.01885	0
Pesticides Metazachlor	P203	0.1 µg/l	187	0	<0.005	0.00624	0
Pesticides Monuron	P113	0.1 µg/l	715	0	<0.005	<0.006	0
Pesticides Pentachlorophenol	P060	0.1 µg/l	712	0	<0.008	<0.008	0
Pesticides Picloram (Total)	P122	0.1 µg/l	712	0	<0.021	<0.021	0
Pesticides Propyzamide	P071	0.1 µg/l	715	0	<0.005	0.01284	0
Pesticides Quinmerac	P224	0.1 µg/l	189	0	<0.005	0.01284	0
Pesticides Simazine	P073	0.1 µg/l	715	0	<0.009	0.02152	0
Pesticides Triclopyr	P131	0.1 µg/l	712	0	<0.016	<0.016	0
Radon	F031	100 Bq/l	8	0	1.5	2.1	0
Totals			20,555	0

Table 8: Quality of water leaving bulk supply points – 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)
Clostridium Perfringens (Sulphite-reducing Clostridia) (Confirmed)	C004A	0 number/100 ml	722	0	0	0
Gross Alpha	F004	0.1 Bq/l	202	1	<0.05	0.08
Gross Beta	F005	1 Bq/l	202	0	<0.05	0.2097
Total Organic Carbon	A017	No abnormal change	712	N/A	<0.6	3.1
Tritium	F006	100 Bq/l	15	0	<5.6	7.58
Totals			1,853	1

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	1980	0	<0.1	<0.1	0
Antimony	B008A	5 µg Sb/l	1,993	0	<0.3	0.5	0
Arsenic (Total)	B001A	10 µg As/l	1,993	0	<0.3	1.4	0
Benzene (Total)	F002	1 µg/l	1980	0	<0.1	<0.1	0
Benzo[a]Pyrene (Total)	D007	0.01 µg/l	2,035	0	<0.002	<0.002	0
Boron	D005A	1 mg B/l	1,994	0	0.014	0.088	0
Bromate	F003	10 µg BrO3/l	131	0	<0.8	4.236	0
Cadmium (Total)	B002	5 µg Cd/l	1,994	0	<0.2	<0.4	0
Chromium (Total)	B004	50 µg Cr/l	1,994	0	<2	<2	0
Copper (Total)	A024A	2 mg Cu/l	1,971	1	<0.004	0.5934	1
Cyanide (Total)	B003	50 µg CN/l	9	0	<1	<1	0
E coli (faecal coliforms Confirmed)	C002	0 number/100 ml	25,769	1	0	0	1
Enterococci (Confirmed)	C003	0 number/100 ml	1,977	1	0	0	1
Fluoride (Total)	A027	1.5 mg F/l	1,975	0	0.06476	0.44824	0
Lead (10 – will apply 25.12.2013)	B007B	10 µg Pb/l	1,976	5	<0.4	6.223	5
Mercury (Total)	B005	1 µg Hg/l	9	0	<0.07	<0.07	0
Nickel (Total)	B006A	20 µg Ni/l	1,972	4	<1.3	7.216	4
Nitrate (Total)	A012	50 mg NO3/l	7,265	0	6.704	37.0302	0
Nitrite – Consumer’s Taps	A013A	0.5 mg NO2/l	7,265	0	<0.0018	0.239836	0
Nitrite/Nitrate formula	A013C	1 mg/l	7,264	0	0.1895	0.75	0
Pesticides (Total by Calculation)	B010	0.5 µg/l	10	0	0	0.079	0
Pesticides 2 4-D	P020	0.1 µg/l	10	0	<0.017	<0.017	0
Pesticides 2 4-DB	P082	0.1 µg/l	10	0	<0.016	<0.016	0
Pesticides Atrazine	P004	0.1 µg/l	10	0	<0.005	<0.006	0
Pesticides Bentazone	P006	0.1 µg/l	10	0	<0.012	<0.012	0
Pesticides Bromoxynil	P008	0.1 µg/l	10	0	<0.019	<0.019	0
Pesticides Carbendazim (Total)	P150	0.1 µg/l	10	0	<0.02	<0.02	0
Pesticides Carbetamide	P010	0.1 µg/l	10	0	<0.005	<0.007	0
Pesticides Chlortoluron	P014	0.1 µg/l	10	0	<0.004	<0.006	0
Pesticides Clopyralid	P018	0.1 µg/l	10	0	<0.022	<0.022	0
Pesticides Dicamba	P025	0.1 µg/l	10	0	<0.022	<0.022	0
Pesticides Dichlorprop	P026	0.1 µg/l	10	0	<0.012	<0.012	0
Pesticides Diuron	P032	0.1 µg/l	10	0	<0.005	<0.006	0
Pesticides Flufenacet	P230	0.1 µg/l	10	0	<0.004	0.007	0
Pesticides Fluroxypyr	P040	0.1 µg/l	10	0	<0.015	<0.015	0
Pesticides Isoproturon	P048	0.1 µg/l	10	0	<0.004	<0.005	0
Pesticides Linuron	P051	0.1 µg/l	10	0	<0.005	<0.006	0
Pesticides MCPA 4-chloro-o-tolyloxyacetic acid	P054	0.1 µg/l	10	0	<0.02	<0.02	0
Pesticides MCPP (Mecoprop)	P053	0.1 µg/l	10	0	<0.014	<0.014	0
Pesticides Metaldehyde	P226	0.1 µg/l	10	0	<0.014	0.049	0
Pesticides Metazachlor	P203	0.1 µg/l	10	0	<0.005	<0.006	0
Pesticides Monuron	P113	0.1 µg/l	10	0	<0.005	<0.006	0
Pesticides Pentachlorophenol	P060	0.1 µg/l	10	0	<0.008	<0.008	0
Pesticides Picloram (Total)	P122	0.1 µg/l	10	0	<0.021	<0.021	0
Pesticides Propyzamide	P071	0.1 µg/l	10	0	<0.005	0.018	0
Pesticides Quinmerac	P244	0.1 µg/l	10	0	<0.005	<0.017	0
Pesticides Simazine	P073	0.1 µg/l	10	0	<0.009	<0.009	0
Pesticides Triclopyr	P131	0.1 µg/l	10	0	<0.016	<0.016	0
Polycyclic Aromatic Hydrocarbons (Total by Calculation)	B011F	0.1 µg/l	2,005	0	0	0.003	0
Selenium (Total)	B009	10 µg Se/l	1,993	0	<0.4	2.7	0
Trichloroethene & Tetrachloroethene – Sum Of 2 Substances (Total by Calculation)	D009B	10 µg/l	1,980	0	0	1.4	0
Trihalomethanes (Total by Calculation)	D011	100 µg/l	1,980	0	0.9	31.338	0
Totals			81,784	12

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	8,624	0	<10.5	19.5	0
Colour	A001	20 mg/l Pt/Co	9,166	0	<2	<2.66	0
Iron (Total)	A022	200 µg Fe/l	8,960	5	<3	40.517	5
Manganese (Total)	A023	50 µg Mn/l	8,624	0	<0.4	2.6	0
Odour	A003	0 Dilution number at 25°C	9,178	0	0	0	0
Sodium (Total)	A009	200 mg Na/l	1,995	0	6.4	41.104	0
Taste (Taste Quant)	A004	0 Dilution number at 25°C	9,174	2	0	0	2
Tetrachloromethane (Total)	D008	3 µg/l	1,980	0	<0.1	0.2	0
Turbidity	A002	4 NTU	9,176	0	<0.12	0.21	0
Totals			66,877	7

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	7,276	0	<0.01	0.23
Chloride	D002A	250 mg Cl/l	1,996	0	13.1591	60.6336
Clostridium Perfringens (Sulphite-reducing Clostridia) (Confirmed)	C004A	0 number/100 ml	9	0	0	0
Coliform Bacteria (Indicator)	C001A	0 number/100 ml	25,769	59	0	0
Colony Counts After 3 Days At 22øc (Colony Counts)	C007	No abnormal change	9,170	N/A	0	50
Conductivity (Electrical Conductivity)	D001	2500 µS/cm at 20°C	9,187	0	396.4	742.12
Gross Alpha	F004	0.1 Bq/l	9	0	<0.05	0.1
Gross Beta	F005	1 Bq/l	9	0	0.05	0.23
Hydrogen ion (pH) – Indicator (Hydrogen ion) (pH)	A006	6.5 – 9.5 pH Value	9,177	0	7.1	8
Residual Disinfectant – Total	C010	No abnormal change	25,819	N/A	0.16	0.91
Sulphate	A007	250 mg SO4/l	1,996	0	10.1785	76.9503
Total Organic Carbon	A017	No abnormal change	9	N/A	<0.6	6.3
Totals			90,426	59