SEW (South East Water 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	720	0	<0.003	<0.003	0
Totals			720	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	11,960	0	0	0	0
Total Coliforms (Confirmed)	C001	0 number/100 ml	11,960	1	0	0	0
Totals			23,920	1

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	11,950	N/A	0	12
Residual Disinfectant – Free	C009	No abnormal change	11,959	N/A	0.16	1,424
Residual Disinfectant – Total	C010	No abnormal change	11,956	N/A	0.21	1.58
Turbidity – Indicator	A002A	1 NTU	11,958	2	<0.1	0.16
Totals			47,823	2

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	11,515	1	0	0	1
Total Coliforms (Confirmed)	C001	0 number/100 ml	11,515	2	0	0	0
Totals:			23,030	3

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	11,530	N/A	0	>300
Residual Disinfectant – Free	C009	No abnormal change	11,523	N/A	0.05	0.7076
Residual Disinfectant – Total	C010	No abnormal change	11,523	N/A	0.11	0.85
Totals:			34,576	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
Boron	D005A	1 mg B/l	165	0	<0.04	0.25204	0
Bromate	F003	10 µg BrO3/l	165	0	<0.8	3.784	0
Cyanide (Total)	B003	50 µg CN/l	165	0	<2	5.556	0
Fluoride (Total)	A027	1.5 mg F/l	164	0	<0.05	0.2247	0
Mercury (Total)	B005	1 µg Hg/l	164	0	<0.04	0.05	0
Pesticides (Total by Calculation)	B010	0.5 µg/l	165	0	0	0.0327	0
Pesticides 2 4-D	P020	0.1 µg/l	165	0	<0.007	<0.007	0
Pesticides 2,4,5-T	P076	0.1 µg/l	165	0	<0.007	<0.007	0
Pesticides Aldrin	P002	0.03 µg/l	166	0	<0.007	<0.007	0
Pesticides Atrazine	P004	0.1 µg/l	169	0	<0.002	0.0165	0
Pesticides Bentazone	P006	0.1 µg/l	165	0	<0.007	<0.007	0
Pesticides Bromoxynil	P008	0.1 µg/l	165	0	<0.007	<0.007	0
Pesticides Carbendazim (Total)	P150	0.1 µg/l	169	0	<0.001	<0.001	0
Pesticides Carbetamide	P010	0.1 µg/l	169	0	<0.002	0.0102	0
Pesticides Chlortoluron	P014	0.1 µg/l	169	0	<0.003	0.0156	0
Pesticides Dicamba	P025	0.1 µg/l	165	0	<0.02	<0.02	0
Pesticides Dichlobenil	P098	0.1 µg/l	165	0	<0.006	<0.006	0
Pesticides Dichlorprop	P026	0.1 µg/l	165	0	<0.003	<0.003	0
Pesticides Dieldrin	P028	0.03 µg/l	162	0	<0.007	<0.007	0
Pesticides Diuron	P032	0.1 µg/l	169	0	<0.004	0.0076	0
Pesticides Epoxyconazole	P217	0.1 µg/l	169	0	<0.003	<0.003	0
Pesticides Fluroxypyr	P040	0.1 µg/l	165	0	<0.008	<0.008	0
Pesticides Flutriafol	P039	0.1 µg/l	169	0	<0.003	<0.003	0
Pesticides Gamma-HCH (Lindane)	P041	0.1 µg/l	166	0	<0.005	<0.005	0
Pesticides Heptachlor	P043	0.03 µg/l	166	0	<0.008	<0.008	0
Pesticides Heptachlor Epoxide – Total (Trans, CIS) (Heptachlor Epoxide)	P044	0.03 µg/l	166	0	<0.005	<0.005	0
Pesticides Isoproturon	P048	0.1 µg/l	169	0	<0.003	<0.003	0
Pesticides Linuron	P051	0.1 µg/l	164	0	<0.003	<0.003	0
Pesticides MCPA 4-chloro-o-tolyloxyacetic acid	P054	0.1 µg/l	165	0	<0.008	<0.008	0
Pesticides MCPB	P055	0.1 µg/l	165	0	<0.008	<0.008	0
Pesticides MCPP (Mecoprop)	P053	0.1 µg/l	165	0	<0.005	0.0077	0
Pesticides Metaldehyde	P226	0.1 µg/l	24	0	<0.008	0.01	0
Pesticides Oxadixyl	P154	0.1 µg/l	169	0	<0.003	<0.003	0
Pesticides Pendimethalin	P118	0.1 µg/l	169	0	<0.007	<0.007	0
Pesticides Prometryne	P070	0.1 µg/l	169	0	<0.002	<0.002	0
Pesticides Propazine	P066	0.1 µg/l	169	0	<0.002	<0.002	0
Pesticides Propyzamide	P071	0.1 µg/l	166	0	<0.005	<0.005	0
Pesticides Simazine	P073	0.1 µg/l	169	0	<0.003	0.006	0
Pesticides Terbutryn	P077	0.1 µg/l	169	0	<0.002	<0.002	0
Pesticides Tri-allate	P079	0.1 µg/l	166	0	<0.005	<0.005	0
Pesticides Triclopyr	P131	0.1 µg/l	165	0	<0.015	<0.015	0
Pesticides Trietazine	P132	0.1 µg/l	165	0	<0.004	<0.004	0
Totals			6,849	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)
Chloride	D002A	250 mg Cl/l	166	0	10.9446	73.4229
Sulphate	A007	250 mg SO4/l	165	0	<2	75.996
Total Organic Carbon	A017	No abnormal change	165	N/A	<0.3	2.668
Totals			496	0

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	639	0	<0.12	<0.12	0
Antimony	B008A	5 µg Sb/l	605	0	<0.2	0.4	0
Arsenic (Total)	B001A	10 µg As/l	601	0	<1	6.5	0
Benzene (Total)	F002	1 µg/l	633	0	<0.02	<0.02	0
Benzo[a]Pyrene (Total)	D007	0.01 µg/l	620	0	<0.003	<0.003	0
Boron	D005A	1 mg B/l	394	0	<0.04	0.16375	0
Bromate	F003	10 µg BrO3/l	432	0	<0.8	4.534	0
Cadmium (Total)	B002	5 µg Cd/l	626	0	<0.12	<0.12	0
Chromium (Total)	B004	50 µg Cr/l	626	0	<0.5	3	0
Copper (Total)	A024A	2 mg Cu/l	589	0	<0.008	0.7959	0
Cyanide (Total)	B003	50 µg CN/l	394	0	<2	7.43	0
E coli (faecal coliforms Confirmed)	C002	0 number/100 ml	5,944	0	0	0	0
Enterococci (Confirmed)	C003	0 number/100 ml	627	1	0	0	1
Fluoride (Total)	A027	1.5 mg F/l	394	0	<0.05	0.42135	0
Lead (10 – will apply 25.12.2013)	B007B	10 µg Pb/l	593	1	<0.9	6.084	1
Mercury (Total)	B005	1 µg Hg/l	394	0	<0.04	0.05	0
Nickel (Total)	B006A	20 µg Ni/l	589	1	<0.6	14.34	1
Nitrate (Total)	A012	50 mg NO3/l	625	0	<1	45.674	0
Nitrite – Consumer’s Taps	A013A	0.5 mg NO2/l	627	0	<0.003	<0.003	0
Nitrite/Nitrate formula	A013C	1 mg/l	627	0	0	0.91344	0
Pesticides (Total by Calculation)	B010	0.5 µg/l	395	0	0	0.0396	0
Pesticides 2 4-D	P020	0.1 µg/l	404	0	<0.007	0.01095	0
Pesticides 2,4,5-T	P020	0.1 µg/l	404	0	<0.007	<0.007	0
Pesticides Aldrin	P002	0.03 µg/l	385	0	<0.007	<0.007	0
Pesticides Atrazine	P004	0.1 µg/l	397	0	<0.002	0.02002	0
Pesticides Bentazone	P006	0.1 µg/l	404	0	<0.007	0.02095	0
Pesticides Bromoxynil	P008	0.1 µg/l	404	0	<0.007	<0.007	0
Pesticides Carbendazim (Total)	P150	0.1 µg/l	397	0	<0.001	<0.001	0
Pesticides Carbetamide	P010	0.1 µg/l	397	0	<0.002	0.00602	0
Pesticides Chlortoluron	P014	0.1 µg/l	397	0	<0.003	<0.003	0
Pesticides Dicamba	P025	0.1 µg/l	404	0	<0.02	<0.02	0
Pesticides Dichlobenil	P098	0.1 µg/l	386	0	<0.006	<0.006	0
Pesticides Dichlorprop	P026	0.1 µg/l	404	0	<0.003	<0.003	0
Pesticides Dieldrin	P028	0.03 µg/l	380	0	<0.007	<0.007	0
Pesticides Diuron	P032	0.1 µg/l	397	0	<0.004	0.00704	0
Pesticides Epoxyconazole	P217	0.1 µg/l	397	0	<0.003	<0.003	0
Pesticides Fluroxypyr	P040	0.1 µg/l	404	0	<0.008	<0.008	0
Pesticides Flutriafol	P039	0.1 µg/l	397	0	<0.003	0.004	0
Pesticides Gamma-HCH (Lindane)	P041	0.1 µg/l	387	0	<0.005	<0.005	0
Pesticides Heptachlor	P043	0.03 µg/l	387	0	<0.008	<0.008	0
Pesticides Heptachlor Epoxide – Total (Trans, CIS) (Heptachlor Epoxide)	P044	0.03 µg/l	389	0	<0.005	<0.005	0
Pesticides Isoproturon	P048	0.1 µg/l	397	0	<0.003	<0.003	0
Pesticides Linuron	P051	0.1 µg/l	386	0	<0.003	<0.003	0
Pesticides MCPA 4-chloro-o-tolyloxyacetic acid	P054	0.1 µg/l	404	0	<0.008	<0.008	0
Pesticides MCPB	P055	0.1 µg/l	403	0	<0.008	<0.008	0
Pesticides MCPP (Mecoprop)	P053	0.1 µg/l	404	0	<0.005	<0.005	0
Pesticides Metaldehyde	P226	0.1 µg/l	245	0	<0.008	<0.013	0
Pesticides Oxadixyl	P154	0.1 µg/l	397	0	<0.003	<0.01	0
Pesticides Pendimethalin	P118	0.1 µg/l	397	0	<0.007	<0.007	0
Pesticides Prometryne	P070	0.1 µg/l	397	0	<0.002	<0.002	0
Pesticides Propazine	P066	0.1 µg/l	397	0	<0.002	<0.002	0
Pesticides Propyzamide	P071	0.1 µg/l	387	0	<0.005	0.01224	0
Pesticides Simazine	P073	0.1 µg/l	397	0	<0.003	0.012	0
Pesticides Terbutryn	P077	0.1 µg/l	397	0	<0.002	<0.002	0
Pesticides Tri-allate	P079	0.1 µg/l	387	0	<0.005	<0.005	0
Pesticides Triclopyr	P131	0.1 µg/l	404	0	<0.015	<0.015	0
Pesticides Trietazine	P132	0.1 µg/l	397	0	<0.004	0.004	0
Polycyclic Aromatic Hydrocarbons (Total by Calculation)	B011F	0.1 µg/l	578	0	0	0	0
Selenium (Total)	B009	10 µg Se/l	607	0	<0.8	2.692	0
Trichloroethene & Tetrachloroethene – Sum Of 2 Substances (Total by Calculation)	D009B	10 µg/l	629	0	0	2.381	0
Trihalomethanes (Total by Calculation)	D011	100 µg/l	629	0	0	74.034	0
Totals			33,534	3

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	2,006	0	<6	55.365	0
Colour	A001	20 mg/l Pt/Co	2,290	0	<1	1	0
Iron (Total)	A022	200 µg Fe/l	2,006	7	<4	119.632	6
Manganese (Total)	A023	50 µg Mn/l	2,006	1	<1.7	7.872	1
Odour	A003	0 Dilution number at 25°C	2,285	11	0	0	11
Sodium (Total)	A009	200 mg Na/l	607	0	3.816	63.184	0
Taste (Taste Quant)	A004	0 Dilution number at 25°C	2,281	0	0	0	0
Tetrachloromethane (Total)	D008	3 µg/l	643	0	<0.11	<0.11	0
Turbidity	A002	4 NTU	2,286	0	<0.1	0.3552	0
Totals			16,410	19

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	627	0	<0.02	<0.02
Chloride	D002A	250 mg Cl/l	399	0	11.35	67.31
Clostridum Perfringens (Sulphite-reducing Clostridia) (Confirmed)	C004A	0 number/100 ml	627	0	0	0
Coliform Bacteria (Indicator)	C001A	0 number/100 ml	5,944	8	0	0
Colony Counts After 3 Days At 22øc (Colony Counts)	C007	No abnormal change	2,314	N/A	0	95
Conductivity (Electrical Conductivity)	D001	2500 µS/cm at 20°C	2,280	0	216	760
Hydrogen ion (pH) – Indicator (Hydrogen ion) (pH)	A006	6.5 – 9.5 pH Value	2,277	0	7.1	8.1
Residual Disinfectant – Free	C009	No abnormal change	5,931	N/A	<0.05	0.8468
Residual Disinfectant – Total	C010	No abnormal change	5,930	N/A	0.1	1.01
Sulphate	A007	250 mg SO4/l	406	0	9.207	79.981
Total Organic Carbon	A017	No abnormal change	401	N/A	<0.3	2.9
Totals			27,136	8