YKS (Yorkshire Water Services 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	2,221	0	<0.002	0.002	0
Totals			2,221	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	14,071	0	0	0	0
Total Coliforms (Confirmed)	C001	0 number/100 ml	14,071	6	0	0	6
Totals			28,142	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	14,071	N/A	0	2
Residual Disinfectant – Free	C009	No abnormal change	14,071	N/A	0.0272	0.95
Residual Disinfectant – Total	C010	No abnormal change	14,071	N/A	0.1	1.06
Turbidity – Indicator	A002A	1 NTU	14,071	0	<0.13	0.42
Totals			56,284	0

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	17,660	1	0	0	1
Total Coliforms (Confirmed)	C001	0 number/100 ml	17,660	9	0	0	0
Totals:			35,320	10

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	17,660	N/A	0	9
Residual Disinfectant – Free	C009	No abnormal change	17,660	N/A	0	0.79
Residual Disinfectant – Total	C010	No abnormal change	17,660	N/A	0.05	0.88
Totals:			52,980	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	96	0	0.00639	<0.032	0
Cyanide (Total)	B003	50 µg CN/l	96	0	<1.2	35	0
Fluoride (Total)	A027	1.5 mg F/l	96	0	<0.04	0.12	0
Mercury (Total)	B005	1 µg Hg/l	96	0	<0.04	0.12	0
Pesticides (Total by Calculation)	B010	0.5 µg/l	96	0	0	0.09	0
Pesticides 1,1,1-trichloro-2,2-ethane pp’-DDT	P125	0.1 µg/l	96	0	<0.004	<0.005	0
Pesticides 1,1-dichloro-2,2-bis-ethane pp’-DDE	P124	0.1 µg/l	96	0	<0.005	<0.005	0
Pesticides 2 4-D	P020	0.1 µg/l	96	0	<0.012	0.018	0
Pesticides 2 4-DB	P082	0.1 µg/l	96	0	<0.017	<0.018	0
Pesticides 2,4,5-T	P076	0.1 µg/l	96	0	<0.011	<0.016	0
Pesticides Aldrin	P002	0.03 µg/l	96	0	<0.005	<0.008	0
Pesticides Atrazine	P004	0.1 µg/l	96	0	<0.004	<0.008	0
Pesticides Bentazone	P006	0.1 µg/l	96	0	<0.002	<0.004	0
Pesticides Bromacil	P086	0.1 µg/l	96	0	<0.007	<0.009	0
Pesticides Bromoxynil	P008	0.1 µg/l	96	0	<0.009	<0.009	0
Pesticides Carbetamide	P010	0.1 µg/l	96	0	<0.008	0.012	0
Pesticides Chlormequat	P163	0.1 µg/l	96	0	<0.003	<0.003	0
Pesticides Chlorpropham	P016	0.1 µg/l	96	0	<0.012	<0.014	0
Pesticides Chlorpyrifos (Chlorpyriphos Ethyl)	P017	0.1 µg/l	96	0	<0.016	<0.016	0
Pesticides Chlortoluron	P014	0.1 µg/l	96	0	<0.006	<0.007	0
Pesticides Clomazone	P246	0.1 µg/l	96	0	<0.005	<0.008	0
Pesticides Clopyralid	P018	0.1 µg/l	96	0	<0.011	0.034	0
Pesticides Cyanazine	P092	0.1 µg/l	96	0	<0.006	<0.007	0
Pesticides Cypermethrin	P094	0.1 µg/l	96	0	<0.005	<0.008	0
Pesticides Cyproconazole	P207	0.1 µg/l	96	0	<0.007	<0.008	0
Pesticides Diazinon	P024	0.1 µg/l	96	0	<0.006	<0.007	0
Pesticides Dicamba	P025	0.1 µg/l	96	0	<0.012	<0.014	0
Pesticides Dichlobenil	P098	0.1 µg/l	96	0	<0.004	<0.005	0
Pesticides Dichlorodiphenyldichlorethane pp’-DDD TDE	P123	0.1 µg/l	96	0	<0.005	<0.005	0
Pesticides Dichlorodiphenyldichloroethyle op’-DDE	P115	0.1 µg/l	96	0	<0.005	<0.005	0
Pesticides Dichlorprop	P026	0.1 µg/l	96	0	<0.011	<0.017	0
Pesticides Dieldrin	P028	0.03 µg/l	96	0	<0.005	<0.009	0
Pesticides Difenconazole	P247	0.1 µg/l	96	0	<0.007	<0.009	0
Pesticides Diflufenican	P157	0.1 µg/l	96	0	<0.007	<0.009	0
Pesticides Diuron	P032	0.1 µg/l	96	0	<0.009	<0.01	0
Pesticides Epoxyconazole	P217	0.1 µg/l	96	0	<0.005	<0.006	0
Pesticides EPTC	P035	0.1 µg/l	96	0	<0.01	<0.013	0
Pesticides Flufenacet	P230	0.1 µg/l	96	0	<0.008	0.034	0
Pesticides Fluroxypyr	P040	0.1 µg/l	96	0	<0.009	<0.012	0
Pesticides Flurtamone	P248	0.1 µg/l	96	0	<0.007	<0.014	0
Pesticides Flusilazole	P159	0.1 µg/l	96	0	<0.006	<0.007	0
Pesticides Flutriafol	P039	0.1 µg/l	96	0	<0.005	<0.005	0
Pesticides Gamma-HCH (Lindane)	P041	0.1 µg/l	96	0	<0.005	0.006	0
Pesticides Heptachlor	P043	0.03 µg/l	96	0	<0.004	<0.005	0
Pesticides Heptachlor Epoxide – Total (Trans, CIS) (Heptachlor Epoxide)	P044	0.03 µg/l	96	0	<0.006	<0.007	0
Pesticides Imazapyr	P160	0.1 µg/l	96	0	<0.004	<0.009	0
Pesticides Ioxynil	P049	0.1 µg/l	96	0	<0.007	<0.009	0
Pesticides Isoproturon	P048	0.1 µg/l	96	0	<0.005	<0.006	0
Pesticides Linuron	P051	0.1 µg/l	96	0	<0.007	<0.012	0
Pesticides MCPA 4-chloro-o-tolyloxyacetic acid	P054	0.1 µg/l	96	0	<0.008	0.013	0
Pesticides Mecoprop-P	P249	0.1 µg/l	96	0	<0.007	<0.009	0
Pesticides Mepiquat Chloride	P280	0.1 µg/l	96	0	<0.004	<0.004	0
Pesticides Metaldehyde	P226	0.1 µg/l	96	0	<0.007	0.015	0
Pesticides Metazachlor	P203	0.1 µg/l	96	0	<0.006	<0.007	0
Pesticides Monuron	P113	0.1 µg/l	96	0	<0.007	<0.007	0
Pesticides op’-DDD (TDE)	P114	0.1 µg/l	96	0	<0.005	<0.005	0
Pesticides Oxadixyl	P154	0.1 µg/l	96	0	<0.01	<0.024	0
Pesticides Pendimethalin	P118	0.1 µg/l	96	0	<0.009	<0.02	0
Pesticides Propachlor	P126	0.1 µg/l	96	0	<0.006	<0.008	0
Pesticides Propham	P067	0.1 µg/l	96	0	<0.007	<0.009	0
Pesticides Propiconazole	P068	0.1 µg/l	96	0	<0.007	<0.007	0
Pesticides Propyzamide	P071	0.1 µg/l	96	0	<0.007	0.033	0
Pesticides Prosulfocarb	P243	0.1 µg/l	96	0	<0.007	<0.009	0
Pesticides Quinmerac	P224	0.1 µg/l	96	0	<0.006	0.007	0
Pesticides Simazine	P073	0.1 µg/l	96	0	<0.004	<0.005	0
Pesticides Tebuconazole	P177	0.1 µg/l	96	0	<0.005	<0.009	0
Pesticides Tri-allate	P079	0.1 µg/l	96	0	<0.005	<0.006	0
Pesticides Trichloro-2(2chlorophenyl)2eth op’-DDT	P116	0.1 µg/l	96	0	<0.004	<0.005	0
Pesticides Triclopyr	P131	0.1 µg/l	96	0	<0.015	<0.028	0
Pesticides Trietazine	P132	0.1 µg/l	96	0	<0.004	<0.006	0
Totals			6,720	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	96	0	5.6	36.7
Clostridum Perfringens (Sulphite-reducing Clostridia) (Confirmed)	C004A	0 number/100 ml	481	0	0	0
Conductivity (Electrical Conductivity)	D001	2500 µS/cm at 20°C	5,959	0	111.6	725
Total Organic Carbon	A017	No abnormal change	96	N/A	0.8	2.38
Totals			6,632	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	712	0	<0.16	<0.16	0
Antimony	B008A	5 µg Sb/l	712	0	0.0313	0.2387	0
Arsenic (Total)	B001A	10 µg As/l	712	0	0.07	1.6787	0
Benzene (Total)	F002	1 µg/l	712	0	<0.06	<0.09	0
Benzo[a]Pyrene (Total)	D007	0.01 µg/l	712	0	<0.00057	<0.00057	0
Boron	D005A	1 mg B/l	592	0	0.0088128	0.046791	0
Bromate	F003	10 µg BrO3/l	712	0	<0.2	3.587	0
Cadmium (Total)	B002	5 µg Cd/l	712	0	<0.01	<0.05	0
Chromium (Total)	B004	50 µg Cr/l	712	0	<0.04	0.9187	0
Copper (Total)	A024A	2 mg Cu/l	712	0	0.0005	0.34127	0
Cyanide (Total)	B003	50 µg CN/l	577	0	<1.2	19.66	0
E coli (faecal coliforms Confirmed)	C002	0 number/100 ml	12,696	0	0	0	0
Enterococci (Confirmed)	C003	0 number/100 ml	712	0	0	0	0
Fluoride (Total)	A027	1.5 mg F/l	592	0	<0.04	0.16	0
Lead (10 – will apply 25.12.2013)	B007B	10 µg Pb/l	712	5	<0.02	6.6131	5
Mercury (Total)	B005	1 µg Hg/l	576	0	<0.04	<0.06	0
Nickel (Total)	B006A	20 µg Ni/l	712	4	0.1713	8.971	3
Nitrate (Total)	A012	50 mg NO3/l	1,412	0	<2.11	42.374	0
Nitrite – Consumer’s Taps	A013A	0.5 mg NO2/l	1,412	0	<0.002	0.26748	0
Nitrite/Nitrate formula	A013C	1 mg/l	1,412	0	0	0.8487	0
Pesticides (Total by Calculation)	B010	0.5 µg/l	576	0	0	0.06846	0
Pesticides 1,1,1-trichloro-2,2-ethane pp’-DDT	P125	0.1 µg/l	576	0	<0.004	<0.005	0
Pesticides 1,1-dichloro-2,2-bis-ethane pp’-DDE	P124	0.1 µg/l	576	0	<0.005	<0.005	0
Pesticides 2 4-D	P020	0.1 µg/l	576	0	<0.012	<0.012	0
Pesticides 2 4-DB	P082	0.1 µg/l	576	0	<0.017	<0.018	0
Pesticides 2,4,5-T	P076	0.1 µg/l	576	0	<0.011	<0.016	0
Pesticides Aldrin	P002	0.03 µg/l	576	0	<0.005	<0.008	0
Pesticides Atrazine	P004	0.1 µg/l	576	0	<0.004	0.038	0
Pesticides Bentazone	P006	0.1 µg/l	576	0	<0.002	0.011	0
Pesticides Bromacil	P086	0.1 µg/l	576	0	<0.007	<0.009	0
Pesticides Bromoxynil	P008	0.1 µg/l	576	0	<0.009	<0.009	0
Pesticides Carbetamide	P010	0.1 µg/l	576	0	<0.008	<0.01	0
Pesticides Chlormequat	P163	0.1 µg/l	576	0	<0.003	<0.003	0
Pesticides Chlorpropham	P016	0.1 µg/l	576	0	<0.012	<0.014	0
Pesticides Chlorpyrifos (Chlorpyriphos Ethyl)	P017	0.1 µg/l	576	0	<0.016	<0.016	0
Pesticides Chlortoluron	P014	0.1 µg/l	576	0	<0.006	<0.007	0
Pesticides Clomazone	P246	0.1 µg/l	576	0	<0.005	<0.008	0
Pesticides Clopyralid	P018	0.1 µg/l	576	0	<0.011	0.02769	0
Pesticides Cyanazine	P092	0.1 µg/l	576	0	<0.006	<0.007	0
Pesticides Cypermethrin	P094	0.1 µg/l	576	0	<0.005	<0.008	0
Pesticides Cyproconazole	P207	0.1 µg/l	576	0	<0.007	<0.008	0
Pesticides Diazinon	P024	0.1 µg/l	576	0	<0.006	<0.007	0
Pesticides Dicamba	P025	0.1 µg/l	576	0	<0.012	<0.014	0
Pesticides Dichlobenil	P098	0.1 µg/l	576	0	<0.004	<0.005	0
Pesticides Dichlorodiphenyldichlorethane pp’-DDD TDE	P123	0.1 µg/l	576	0	<0.005	<0.005	0
Pesticides Dichlorodiphenyldichloroethyle op’-DDE	P115	0.1 µg/l	576	0	<0.005	<0.005	0
Pesticides Dichlorprop	P026	0.1 µg/l	576	0	<0.011	<0.017	0
Pesticides Dieldrin	P028	0.03 µg/l	576	0	<0.005	<0.009	0
Pesticides Difenconazole	P247	0.1 µg/l	576	0	<0.007	<0.009	0
Pesticides Diflufenican	P157	0.1 µg/l	576	0	<0.007	<0.009	0
Pesticides Diuron	P032	0.1 µg/l	576	0	<0.009	<0.01	0
Pesticides Epoxyconazole	P217	0.1 µg/l	576	0	<0.005	<0.006	0
Pesticides EPTC	P035	0.1 µg/l	576	0	<0.01	<0.013	0
Pesticides Flufenacet	P230	0.1 µg/l	576	0	<0.008	0.029	0
Pesticides Fluroxypyr	P040	0.1 µg/l	576	0	<0.009	<0.012	0
Pesticides Flurtamone	P248	0.1 µg/l	576	0	<0.007	<0.007	0
Pesticides Flusilazole	P159	0.1 µg/l	576	0	<0.006	<0.007	0
Pesticides Flutriafol	P039	0.1 µg/l	576	0	<0.005	<0.005	0
Pesticides Gamma-HCH (Lindane)	P041	0.1 µg/l	576	0	<0.005	<0.006	0
Pesticides Heptachlor	P043	0.03 µg/l	576	0	<0.004	<0.005	0
Pesticides Heptachlor Epoxide – Total (Trans, CIS) (Heptachlor Epoxide)	P044	0.03 µg/l	576	0	<0.006	<0.007	0
Pesticides Imazapyr	P160	0.1 µg/l	576	0	<0.004	<0.009	0
Pesticides Ioxynil	P049	0.1 µg/l	576	0	<0.007	<0.009	0
Pesticides Isoproturon	P048	0.1 µg/l	576	0	<0.005	<0.006	0
Pesticides Linuron	P051	0.1 µg/l	576	0	<0.007	<0.012	0
Pesticides MCPA 4-chloro-o-tolyloxyacetic acid	P054	0.1 µg/l	576	0	<0.008	<0.012	0
Pesticides Mecoprop-P	P249	0.1 µg/l	576	0	<0.007	<0.009	0
Pesticides Mepiquat Chloride	P280	0.1 µg/l	576	0	<0.004	<0.004	0
Pesticides Metaldehyde	P226	0.1 µg/l	576	0	<0.007	0.02023	0
Pesticides Metazachlor	P203	0.1 µg/l	576	0	<0.006	<0.00746	0
Pesticides Monuron	P113	0.1 µg/l	576	0	<0.007	<0.007	0
Pesticides op’-DDD (TDE)	P114	0.1 µg/l	576	0	<0.005	<0.005	0
Pesticides Oxadixyl	P154	0.1 µg/l	576	0	<0.01	<0.012	0
Pesticides Pendimethalin	P118	0.1 µg/l	576	0	<0.009	0.02	0
Pesticides Propachlor	P126	0.1 µg/l	576	0	<0.006	<0.008	0
Pesticides Propham	P067	0.1 µg/l	576	0	<0.007	<0.009	0
Pesticides Propiconazole	P068	0.1 µg/l	576	0	<0.007	<0.007	0
Pesticides Propyzamide	P071	0.1 µg/l	576	0	<0.007	0.01823	0
Pesticides Prosulfocarb	P243	0.1 µg/l	576	0	<0.007	<0.009	0
Pesticides Quinmerac	P244	0.1 µg/l	576	0	<0.006	0.008	0
Pesticides Simazine	P073	0.1 µg/l	576	0	<0.004	0.006	0
Pesticides Tebuconazole	P177	0.1 µg/l	576	0	<0.005	<0.009	0
Pesticides Tri-allate	P079	0.1 µg/l	576	0	<0.005	<0.006	0
Pesticides Trichloro-2(2chlorophenyl)2eth op’-DDT	P116	0.1 µg/l	576	0	<0.004	<0.005	0
Pesticides Triclopyr	P131	0.1 µg/l	576	0	<0.015	<0.028	0
Pesticides Trietazine	P132	0.1 µg/l	576	0	<0.004	<0.006	0
Polycyclic Aromatic Hydrocarbons (Total by Calculation)	B011F	0.1 µg/l	712	0	0	0.001	0
Selenium (Total)	B009	10 µg Se/l	712	0	<0.08	0.8474	0
Trichloroethene & Tetrachloroethene – Sum Of 2 Substances (Total by Calculation)	D009B	10 µg/l	712	0	0	0	0
Trihalomethanes (Total by Calculation)	D011	100 µg/l	712	1	3.0113	55.224	1
Totals			68,677	10

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	4,340	1	<6.9	27.254	1
Colour	A001	20 mg/l Pt/Co	4,340	0	<2.9	<3	0
Iron (Total)	A022	200 µg Fe/l	4,340	18	<3.72	115	14
Manganese (Total)	A023	50 µg Mn/l	4,340	1	<0.3	7.8631	1
Odour	A003	0 Dilution number at 25°C	4,340	3	0	0	3
Sodium (Total)	A009	200 mg Na/l	712	0	5.37	40.322	0
Taste (Taste Quant)	A004	0 Dilution number at 25°C	4,340	1	0	0	1
Tetrachloromethane (Total)	D008	3 µg/l	712	0	<0.13	<0.16	0
Turbidity	A002	4 NTU	4,340	1	<0.13	0.4759	1
Totals			31,804	25

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	4,340	0	<0.008	0.17359
Chloride	D002A	250 mg Cl/l	592	0	6.1	52.114
Coliform Bacteria (Indicator)	C001A	0 number/100 ml	12,696	15	0	0
Colony Counts After 3 Days At 22øc (Colony Counts)	C007	No abnormal change	4,341	N/A	0	10
Conductivity (Electrical Conductivity)	D001	2500 µS/cm at 20°C	4,340	0	112.41	709
Gross Alpha	F004	0.1 Bq/l	72	0	<0.021	0.096
Gross Beta	F005	1 Bq/l	72	0	0.036	0.125
Hydrogen ion (pH) – Indicator (Hydrogen ion) (pH)	A006	6.5 – 9.5 pH Value	4,340	0	7	8.02
Residual Disinfectant – Free	C009	No abnormal change	12,696	N/A	0.01	0.74
Residual Disinfectant – Total	C010	No abnormal change	12,696	N/A	0.05	0.83
Sulphate	A007	250 mg SO4/l	712	0	19.039	154.74
Total Organic Carbon	A017	No abnormal change	592	N/A	<0.7	2.4442
Totals			57,489	15