NES (Northumbrian, Essex and Suffolk 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	3,161	0	<0.0035	<0.0058	0
Totals			3,161	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	9,928	1	0	0	1
Total Coliforms (Confirmed)	C001	0 number/100 ml	9,928	7	0	0	6
Totals			19,856	8

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	9,915	N/A	0	4
Residual Disinfectant – Free	C009	No abnormal change	6,318	N/A	0.19	1.17
Residual Disinfectant – Total	C010	No abnormal change	9,915	N/A	0.36	1.3784
Turbidity – Indicator	A002A	1 NTU	9,928	1	<0.09	0.26
Totals			36,076	1

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	15,350	0	0	0	0
Total Coliforms (Confirmed)	C001	0 number/100 ml	15,350	3	0	0	1
Totals:			30,700	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	15,322	N/A	0	212
Residual Disinfectant – Free	C009	No abnormal change	10,026	N/A	<0.05	0.93
Residual Disinfectant – Total	C010	No abnormal change	15,328	N/A	0.09	1.05
Totals:			40,676	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
1 2-Dichloroethane (Total)	F001	3 µg/l	346	0	<0.079	<0.2	0
Benzene (Total)	F002	1 µg/l	346	0	<0.03	<0.041	0
Boron	D005A	1 mg B/l	72	0	0.043	0.072	0
Cyanide (Total)	B003	50 µg CN/l	346	0	<5.5	<5.5	0
Fluoride (Total)	A027	1.5 mg F/l	72	0	0.16	0.35	0
Mercury (Total)	B005	1 µg Hg/l	346	0	<0.022	<0.022	0
Pesticides (Total by Calculation)	B010	0.5 µg/l	346	0	0	0.14618	0
Pesticides 2 4-D	P020	0.1 µg/l	346	0	<0.0036	0.006465	0
Pesticides 2 4-DB	P082	0.1 µg/l	72	0	<0.012	<0.012	0
Pesticides 2,4,5-T	P076	0.1 µg/l	72	0	<0.0044	<0.0044	0
Pesticides Aldrin	P002	0.03 µg/l	343	0	<0.0025	<0.0025	0
Pesticides Aminomethylphosphonic acid	P273	0.1 µg/l	346	0	<0.0093	<0.012	0
Pesticides Asulam	P133	0.1 µg/l	344	0	<0.017	<0.017	0
Pesticides Benazolin (Total)	P138	0.1 µg/l	274	0	<0.013	<0.013	0
Pesticides Bentazone	P006	0.1 µg/l	346	0	<0.0025	0.01153	0
Pesticides Carbetamide	P010	0.1 µg/l	346	0	<0.0083	<0.0083	0
Pesticides Chloridazon	P162	0.1 µg/l	72	0	<0.0048	<0.0048	0
Pesticides Chlormequat	P163	0.1 µg/l	274	0	<0.02	<0.02	0
Pesticides Chlorothalonil	P015	0.1 µg/l	72	0	<0.0071	<0.0071	0
Pesticides Chlortoluron	P014	0.1 µg/l	346	0	<0.0031	<0.0031	0
Pesticides Clopyralid	P018	0.1 µg/l	345	0	<0.013	0.03716	0
Pesticides Cypermethrin	P094	0.1 µg/l	272	0	<0.012	<0.016	0
Pesticides Diazinon	P024	0.1 µg/l	273	0	<0.0074	<0.0094	0
Pesticides Dicamba	P025	0.1 µg/l	72	0	<0.017	<0.017	0
Pesticides Dichlorprop	P026	0.1 µg/l	72	0	<0.0041	<0.0041	0
Pesticides Dieldrin	P028	0.03 µg/l	343	0	<0.0019	<0.0019	0
Pesticides Diflufenican	P157	0.1 µg/l	345	0	<0.0072	<0.0086	0
Pesticides Diuron	P032	0.1 µg/l	346	0	<0.0055	<0.0055	0
Pesticides Ethofumersate	P221	0.1 µg/l	346	0	<0.007	<0.007	0
Pesticides Fenpropimorph	P037	0.1 µg/l	273	0	<0.0083	<0.0089	0
Pesticides Flufenacet	P230	0.1 µg/l	72	0	<0.0052	0.053	0
Pesticides Fluroxypyr	P040	0.1 µg/l	326	0	<0.018	<0.018	0
Pesticides Glyphosate	P042	0.1 µg/l	346	0	<0.0077	<0.0079	0
Pesticides Heptachlor	P043	0.03 µg/l	343	0	<0.0026	<0.0026	0
Pesticides Heptachlor Epoxide – Total (Trans, CIS) (Heptachlor Epoxide)	P044	0.03 µg/l	343	0	0	0	0
Pesticides Hexachlorobenzene	P045	0.1 µg/l	72	0	<0.0065	<0.0065	0
Pesticides Isoproturon	P048	0.1 µg/l	346	0	<0.0025	0.0097	0
Pesticides Lenacil	P109	0.1 µg/l	72	0	<0.0057	<0.0057	0
Pesticides Linuron	P051	0.1 µg/l	72	0	<0.0034	<0.0034	0
Pesticides MCPA 4-chloro-o-tolyloxyacetic acid	P054	0.1 µg/l	346	0	<0.0019	0.01665	0
Pesticides MCPB	P055	0.1 µg/l	274	0	<0.014	<0.014	0
Pesticides MCPP (Mecoprop)	P053	0.1 µg/l	346	0	<0.0041	0.005359	0
Pesticides Metaldehyde	P226	0.1 µg/l	346	0	<0.021	0.05265	0
Pesticides Metamitron	P194	0.1 µg/l	346	0	<0.0074	<0.0074	0
Pesticides Metazachlor	P203	0.1 µg/l	345	0	<0.01	0.01916	0
Pesticides Oxamyl	P263	0.1 µg/l	72	0	<0.0023	<0.023	0
Pesticides Pendimethalin	P118	0.1 µg/l	345	0	<0.0064	<0.0082	0
Pesticides Pentachlorophenol	P060	0.1 µg/l	72	0	<0.0062	<0.0062	0
Pesticides Picloram (Total)	P122	0.1 µg/l	346	0	<0.012	<0.012	0
Pesticides Propyzamide	P071	0.1 µg/l	345	0	<0.0072	0.07356	0
Pesticides Quinmerac	P224	0.1 µg/l	338	0	<0.0052	0.02	0
Pesticides Tebuconazole	P177	0.1 µg/l	77	0	<0.0039	<0.0039	0
Pesticides Terbutryn	P077	0.1 µg/l	72	0	<0.0047	<0.0073	0
Pesticides Triclopyr	P131	0.1 µg/l	346	0	<0.012	<0.012	0
Radon	F031	100 Bq/l	25	0	<10	31	0
Trichloroethene & Tetrachloroethene – Sum Of 2 Substances (Total by Calculation)	D009B	10 µg/l	346	0	0	0	0
Totals			14,208	0

Table 7: Quality of water leaving bulk supply points – 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 supply points with failures
Tetrachloromethane (Total)	D008	3 µg/l	346	0	<0.081	<0.11	0
Totals			346	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	72	0	51	86
Sulphate	A007	250 mg SO4/l	72	0	44	100
Total Organic Carbon	A017	No abnormal change	346	N/A	<0.2	4.1
Totals			490	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 supply point with failures
1 2-Dichloroethane (Total)	F001	3 µg/l	128	0	<0.079	<0.2	0
Antimony	B008A	5 µg Sb/l	875	0	<0.16	0.5624	0
Arsenic (Total)	B001A	10 µg As/l	875	0	<0.046	1.4	0
Benzene (Total)	F002	1 µg/l	128	0	<0.03	<0.041	0
Benzo[a]Pyrene (Total)	D007	0.01 µg/l	875	0	<0.0019	<0.0019	0
Boron	D005A	1 mg B/l	675	0	<0.0064	0.1048	0
Bromate	F003	10 µg BrO3/l	875	0	<0.99	2.9	0
Cadmium (Total)	B002	5 µg Cd/l	875	0	<0.018	0.05996	0
Chromium (Total)	B004	50 µg Cr/l	875	0	<0.17	0.3024	0
Copper (Total)	A024A	2 mg Cu/l	875	0	<0.0014	0.47	0
Cyanide (Total)	B003	50 µg CN/l	128	0	<5.5	14.84	0
E coli (faecal coliforms Confirmed)	C002	0 number/100 ml	11,494	2	0	0	2
Enterococci (Confirmed)	C003	0 number/100 ml	875	0	0	0	0
Fluoride (Fluoridated)	A027A	1.2 mg F/l	80	35	<0.06	1	8
Fluoride (Total)	A027	1.5 mg F/l	675	0	<0.06	1	0
Lead (10 – will apply 25.12.2013)	B007B	10 µg Pb/l	875	4	<0.065	7.4	4
Mercury (Total)	B005	1 µg Hg/l	128	0	<0.022	0.03384	0
Nickel (Total)	B006A	20 µg Ni/l	875	6	0.11	15.24	6
Nitrate (Total)	A012	50 mg NO3/l	2,240	0	<0.91	41	0
Nitrite – Consumer’s Taps	A013A	0.5 mg NO2/l	2,240	0	<0.0035	0.35	0
Nitrite/Nitrate formula	A013C	1 mg/l	2,240	0	<0.019	<0.82	0
Pesticides (Total by Calculation)	B010	0.5 µg/l	128	0	0	0.098355	0
Pesticides 2 4-D	P020	0.1 µg/l	128	0	<0.0036	0.006656	0
Pesticides 2 4-DB	P082	0.1 µg/l	127	0	<0.012	<0.012	0
Pesticides 2,4,5-T	P076	0.1 µg/l	127	0	<0.0044	<0.0044	0
Pesticides Aldrin	P002	0.03 µg/l	128	0	<0.0025	<0.0025	0
Pesticides Aminomethylphosphonic acid	P273	0.1 µg/l	128	0	<0.0093	<0.06312	0
Pesticides Asulam	P133	0.1 µg/l	128	0	<0.017	<0.07021	0
Pesticides Benazolin (Total)	P138	0.1 µg/l	1	0	<0.013	<0.013	0
Pesticides Bentazone	P006	0.1 µg/l	128	0	<0.0025	0.01371	0
Pesticides Carbetamide	P010	0.1 µg/l	128	0	<0.0083	<0.0083	0
Pesticides Chloridazon	P162	0.1 µg/l	127	0	<0.0048	<0.0048	0
Pesticides Chlormequat	P163	0.1 µg/l	1	0	<0.02	<0.02	0
Pesticides Chlorothalonil	P015	0.1 µg/l	127	0	<0.0071	<0.0071	0
Pesticides Chlortoluron	P014	0.1 µg/l	128	0	<0.0031	0.003726	0
Pesticides Clopyralid	P018	0.1 µg/l	128	0	<0.013	0.05565	0
Pesticides Cypermethrin	P094	0.1 µg/l	1	0	<0.016	<0.016	0
Pesticides Diazinon	P024	0.1 µg/l	1	0	<0.0094	<0.0094	0
Pesticides Dicamba	P025	0.1 µg/l	127	0	<0.017	<0.017	0
Pesticides Dichlorprop	P026	0.1 µg/l	127	0	<0.0041	<0.0041	0
Pesticides Dieldrin	P028	0.03 µg/l	128	0	<0.0019	<0.0019	0
Pesticides Diflufenican	P157	0.1 µg/l	128	0	<0.0072	<0.0086	0
Pesticides Diuron	P032	0.1 µg/l	128	0	<0.0055	<0.0055	0
Pesticides Ethofumersate	P221	0.1 µg/l	128	0	<0.007	<0.007	0
Pesticides Fenpropimorph	P037	0.1 µg/l	1	0	<0.0089	<0.0089	0
Pesticides Flufenacet	P230	0.1 µg/l	127	0	<0.0052	0.01992	0
Pesticides Fluroxypyr	P040	0.1 µg/l	128	0	<0.018	<0.018	0
Pesticides Glyphosate	P042	0.1 µg/l	128	0	<0.0077	<0.0079	0
Pesticides Heptachlor	P043	0.03 µg/l	128	0	<0.0026	<0.0026	0
Pesticides Heptachlor Epoxide – Total (Trans, CIS) (Heptachlor Epoxide)	P044	0.03 µg/l	128	0	0	0	0
Pesticides Hexachlorobenzene	P045	0.1 µg/l	127	0	<0.0065	<0.0065	0
Pesticides Isoproturon	P048	0.1 µg/l	128	0	<0.0025	0.005981	0
Pesticides Lenacil	P109	0.1 µg/l	127	0	<0.0057	<0.0057	0
Pesticides Linuron	P051	0.1 µg/l	127	0	<0.0034	<0.0034	0
Pesticides MCPA 4-chloro-o-tolyloxyacetic acid	P054	0.1 µg/l	128	0	<0.0019	<0.0019	0
Pesticides MCPB	P055	0.1 µg/l	1	0	<0.014	<0.014	0
Pesticides MCPP (Mecoprop)	P053	0.1 µg/l	128	0	<0.0041	0.008494	0
Pesticides Metaldehyde	P226	0.1 µg/l	128	0	<0.021	0.04639	0
Pesticides Metamitron	P194	0.1 µg/l	128	0	<0.0074	<0.0074	0
Pesticides Metazachlor	P203	0.1 µg/l	128	0	<0.01	<0.015	0
Pesticides Oxamyl	P263	0.1 µg/l	127	0	<0.0023	<0.03956	0
Pesticides Pendimethalin	P118	0.1 µg/l	128	0	<0.0064	<0.0082	0
Pesticides Pentachlorophenol	P060	0.1 µg/l	127	0	<0.0062	<0.0062	0
Pesticides Picloram (Total)	P122	0.1 µg/l	128	0	<0.012	<0.012	0
Pesticides Propyzamide	P071	0.1 µg/l	128	0	<0.0072	0.04181	0
Pesticides Quinmerac	P224	0.1 µg/l	128	0	<0.0052	<0.01071	0
Pesticides Tebuconazole	P177	0.1 µg/l	127	0	<0.0039	<0.0039	0
Pesticides Terbutryn	P077	0.1 µg/l	127	0	<0.0047	<0.0073	0
Pesticides Triclopyr	P131	0.1 µg/l	128	0	<0.012	<0.012	0
Polycyclic Aromatic Hydrocarbons (Total by Calculation)	B011F	0.1 µg/l	875	0	0	0	0
Selenium (Total)	B009	10 µg Se/l	875	0	<0.83	2.572	0
Trichloroethene & Tetrachloroethene – Sum Of 2 Substances (Total by Calculation)	D009B	10 µg/l	128	0	0	0	0
Trihalomethanes (Total by Calculation)	D011	100 µg/l	875	0	0	56.24	0
Totals			37,027	47

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	4,097	1	<3.9	57.02	1
Colour	A001	20 mg/l Pt/Co	4,163	0	<0.81	3.4	0
Iron (Total)	A022	200 µg Fe/l	4,097	16	<2.3	120	14
Manganese (Total)	A023	50 µg Mn/l	4,053	1	<0.28	6.492	1
Odour	A003	0 Dilution number at 25°C	4,162	20	0	0	16
Sodium (Total)	A009	200 mg Na/l	875	0	2.7	70	0
Taste (Taste Quant)	A004	0 Dilution number at 25°C	4,157	7	0	0	7
Tetrachloromethane (Total)	D008	3 µg/l	128	0	<0.081	<0.11	0
Turbidity	A002	4 NTU	4,162	1	<0.09	0.5337	1
Totals			29,894	46

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	4,102	1	<0.014	0.26
Chloride	D002A	250 mg Cl/l	675	0	3.904	120
Clostridum Perfringens (Sulphite-reducing Clostridia) (Confirmed)	C004A	0 number/100 ml	4,054	4	0	0
Coliform Bacteria (Indicator)	C001A	0 number/100 ml	11,494	19	0	0
Colony Counts After 3 Days At 22øc (Colony Counts)	C007	No abnormal change	4,163	N/A	0	91
Conductivity (Electrical Conductivity)	D001	2500 µS/cm at 20°C	4,163	0	120	1000
Gross Alpha	F004	0.1 Bq/l	8	0	<0.02	0.088
Gross Beta	F005	1 Bq/l	8	0	0.134	0.527
Hydrogen ion (pH) – Indicator (Hydrogen ion) (pH)	A006	6.5 – 9.5 pH Value	4,613	0	7	8
Residual Disinfectant – Free	C009	No abnormal change	6,636	N/A	<0.05	0.8763
Residual Disinfectant – Total	C010	No abnormal change	11,492	N/A	0.09983	1.01
Sulphate	A007	250 mg SO4/l	675	0	6.1	170
Total Organic Carbon	A017	No abnormal change	128	N/A	0.7361	4
Totals			51,761	24