HDC (Hafren Dyfrdwy)

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	42	0	<0.005	<0.013	0
Totals			42	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	952	0	0	0	0
Total Coliforms (Confirmed)	C001	0 number/100 ml	952	0	0	0	0
Totals			1,904	0

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	952	N/A	0	3
Residual Disinfectant – Free	C009	No abnormal change	952	N/A	0.2	0.71
Turbidity – Indicator	A002A	1 NTU	952	0	<0.12	<0.24
Totals			2,856	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	4,215	0	0	0	0
Total Coliforms (Confirmed)	C001	0 number/100 ml	4,215	4	0	0	0
Totals:			8,430	4

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	4,215	N/A	0	63
Residual Disinfectant – Free	C009	No abnormal change	4,215	N/A	0.05	0.58
Totals:			8,430	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	42	0	<0.24	<0.3	0
Benzene (Total)	F002	1 µg/l	42	0	<0.06	<0.12	0
Boron	D005A	1 mg B/l	42	0	<0.011	<0.031	0
Cyanide (Total)	B003	50 µg CN/l	41	0	<3.6	<3.6	0
Fluoride (Total)	A027	1.5 mg F/l	42	0	<0.08	<0.08	0
Mercury (Total)	B005	1 µg Hg/l	42	0	<0.034	<0.034	0
Pesticides (Total by Calculation)	B010	0.5 µg/l	16	0	0	0.006	0
Pesticides 2 4-D	P020	0.1 µg/l	16	0	<0.009	<0.009	0
Pesticides 2 4-DB	P082	0.1 µg/l	16	0	<0.016	<0.016	0
Pesticides 2,3,6-Tba	P074	0.1 µg/l	16	0	<0.027	<0.027	0
Pesticides Aldrin	P002	0.03 µg/l	16	0	<0.003	<0.003	0
Pesticides Asulam	P133	0.1 µg/l	16	0	<0.013	<0.013	0
Pesticides Atrazine	P004	0.1 µg/l	16	0	<0.011	<0.011	0
Pesticides Azoxystrobin	P227	0.1 µg/l	16	0	<0.004	<0.004	0
Pesticides Benazolin (Total)	P138	0.1 µg/l	16	0	<0.007	<0.007	0
Pesticides Bentazone	P006	0.1 µg/l	16	0	<0.006	<0.006	0
Pesticides Boscalid	P231	0.1 µg/l	16	0	<0.007	<0.007	0
Pesticides Bromoxynil	P008	0.1 µg/l	16	0	<0.011	<0.011	0
Pesticides Carbendazim (Total)	P150	0.1 µg/l	16	0	<0.011	<0.011	0
Pesticides Carbetamide	P010	0.1 µg/l	16	0	<0.012	<0.012	0
Pesticides Chloridazon	P162	0.1 µg/l	16	0	<0.004	<0.004	0
Pesticides Chlormequat	P163	0.1 µg/l	16	0	<0.003	<0.003	0
Pesticides Chlortoluron	P014	0.1 µg/l	16	0	<0.012	<0.012	0
Pesticides Clopyralid	P018	0.1 µg/l	16	0	<0.009	<0.009	0
Pesticides Cyproconazole	P207	0.1 µg/l	16	0	<0.007	<0.007	0
Pesticides Diazinon	P024	0.1 µg/l	16	0	<0.01	<0.01	0
Pesticides Dicamba	P025	0.1 µg/l	16	0	<0.015	<0.015	0
Pesticides Dichlorprop	P026	0.1 µg/l	16	0	<0.009	<0.009	0
Pesticides Dieldrin	P028	0.03 µg/l	16	0	<0.008	<0.008	0
Pesticides Diflufenican	P157	0.1 µg/l	16	0	<0.01	<0.01	0
Pesticides Dimethenamid – P	P265	0.1 µg/l	16	0	<0.006	<0.006	0
Pesticides Diuron	P032	0.1 µg/l	16	0	<0.013	<0.013	0
Pesticides Epoxyconazole	P217	0.1 µg/l	16	0	<0.007	<0.007	0
Pesticides Ethofumersate	P221	0.1 µg/l	16	0	<0.015	<0.015	0
Pesticides Flufenacet	P230	0.1 µg/l	16	0	<0.005	<0.005	0
Pesticides Fluroxypyr	P040	0.1 µg/l	16	0	<0.006	<0.006	0
Pesticides Flusilazole	P159	0.1 µg/l	6	0	<0.009	<0.009	0
Pesticides Flutriafol	P039	0.1 µg/l	16	0	<0.015	<0.015	0
Pesticides Glyphosate	P042	0.1 µg/l	16	0	<0.015	<0.03	0
Pesticides Heptachlor	P043	0.03 µg/l	16	0	<0.003	<0.003	0
Pesticides Heptachlor Epoxide – Total (Trans, CIS) (Heptachlor Epoxide)	P044	0.03 µg/l	16	0	0	0	0
Pesticides Isoproturon	P048	0.1 µg/l	16	0	<0.011	<0.011	0
Pesticides Linuron	P051	0.1 µg/l	16	0	<0.012	<0.012	0
Pesticides MCPA 4-chloro-o-tolyloxyacetic acid	P054	0.1 µg/l	16	0	<0.006	<0.006	0
Pesticides MCPP (Mecoprop)	P053	0.1 µg/l	16	0	<0.005	<0.005	0
Pesticides Metalaxyl	P209	0.1 µg/l	16	0	<0.007	<0.007	0
Pesticides Metaldehyde	P226	0.1 µg/l	16	0	<0.006	<0.006	0
Pesticides Metamitron	P194	0.1 µg/l	16	0	<0.012	<0.012	0
Pesticides Metazachlor	P203	0.1 µg/l	16	0	<0.011	<0.011	0
Pesticides Metribuzin	P152	0.1 µg/l	16	0	<0.004	<0.004	0
Pesticides Oxadixyl	P154	0.1 µg/l	16	0	<0.004	<0.004	0
Pesticides Pendimethalin	P118	0.1 µg/l	16	0	<0.012	<0.012	0
Pesticides Propiconazole	P068	0.1 µg/l	16	0	<0.014	<0.014	0
Pesticides Propyzamide	P071	0.1 µg/l	16	0	<0.011	<0.011	0
Pesticides Prosulfocarb	P243	0.1 µg/l	16	0	<0.005	<0.005	0
Pesticides Quinmerac	P224	0.1 µg/l	16	0	<0.009	<0.009	0
Pesticides Simazine	P073	0.1 µg/l	16	0	<0.011	<0.011	0
Pesticides Tebuconazole	P177	0.1 µg/l	16	0	<0.006	<0.006	0
Pesticides Terbutryn	P077	0.1 µg/l	16	0	<0.009	<0.009	0
Pesticides Triadimefon	P078	0.1 µg/l	16	0	<0.012	<0.012	0
Pesticides Tri-allate	P079	0.1 µg/l	16	0	<0.003	<0.003	0
Pesticides Triclopyr	P131	0.1 µg/l	16	0	<0.011	<0.011	0
Trichloroethene & Tetrachloroethene – Sum Of 2 Substances (Total by Calculation)	D009B	10 µg/l	42	0	0	0	0
Totals			1,179	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	42	0	<0.19	<0.2	0
Totals			42	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	42	0	8.7	16.1
Clostridium Perfringens (Sulphite-reducing Clostridia) (Confirmed)	C004A	0 number/100 ml	42	0	0	0
Conductivity (Electrical Conductivity)	D001	2500 µS/cm at 20°C	255	0	85.312	279.2
Sulphate	A007	250 mg SO4/l	42	0	6.4	37.7
Total Organic Carbon	A017	No abnormal change	42	N/A	<0.8	2.1
Totals			423	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	27	0	<0.24	<0.3	0
Antimony	B008A	5 µg Sb/l	107	0	<0.04	<0.3	0
Arsenic (Total)	B001A	10 µg As/l	107	0	0.09	1.38	0
Benzene (Total)	F002	1 µg/l	27	0	<0.06	<0.12	0
Benzo[a]Pyrene (Total)	D007	0.01 µg/l	107	0	<0.00074	<0.001	0
Boron	D005A	1 mg B/l	27	0	<0.011	<0.031	0
Bromate	F003	10 µg BrO3/l	107	0	<0.53	<1.9652	0
Cadmium (Total)	B002	5 µg Cd/l	107	0	<0.02	0.15	0
Chromium (Total)	B004	50 µg Cr/l	107	0	<0.3	<2.1	0
Copper (Total)	A024A	2 mg Cu/l	107	0	<0.0014	0.758864	0
Cyanide (Total)	B003	50 µg CN/l	27	0	<3.6	<3.6	0
E coli (faecal coliforms Confirmed)	C002	0 number/100 ml	624	0	0	0	0
Enterococci (Confirmed)	C003	0 number/100 ml	107	0	0	0	0
Fluoride (Total)	A027	1.5 mg F/l	27	0	<0.08	0.11	0
Lead (10 – will apply 25.12.2013)	B007B	10 µg Pb/l	107	0	<0.13	4.4252	0
Mercury (Total)	B005	1 µg Hg/l	27	0	<0.034	<0.034	0
Nickel (Total)	B006A	20 µg Ni/l	107	0	<0.5	5.268	0
Nitrate (Total)	A012	50 mg NO3/l	107	0	0.7548	29.348	0
Nitrite – Consumer’s Taps	A013A	0.5 mg NO2/l	107	0	<0.005	<0.013	0
Nitrite/Nitrate formula	A013C	1 mg/l	107	0	<0.02	0.5884	0
Pesticides (Total by Calculation)	B010	0.5 µg/l	27	0	0	0.012	0
Pesticides 2 4-D	P020	0.1 µg/l	27	0	<0.009	0.009	0
Pesticides 2 4-DB	P082	0.1 µg/l	27	0	<0.016	<0.016	0
Pesticides 2,3,6-Tba	P074	0.1 µg/l	27	0	<0.027	<0.027	0
Pesticides Aldrin	P002	0.03 µg/l	27	0	<0.003	<0.003	0
Pesticides Asulam	P133	0.1 µg/l	27	0	<0.013	<0.013	0
Pesticides Atrazine	P004	0.1 µg/l	27	0	<0.011	<0.011	0
Pesticides Azoxystrobin	P227	0.1 µg/l	27	0	<0.004	<0.004	0
Pesticides Benazolin (Total)	P138	0.1 µg/l	27	0	<0.007	<0.007	0
Pesticides Bentazone	P006	0.1 µg/l	27	0	<0.006	<0.006	0
Pesticides Boscalid	P231	0.1 µg/l	27	0	<0.007	<0.007	0
Pesticides Bromoxynil	P008	0.1 µg/l	27	0	<0.011	<0.011	0
Pesticides Carbendazim (Total)	P150	0.1 µg/l	27	0	<0.011	<0.011	0
Pesticides Carbetamide	P010	0.1 µg/l	27	0	<0.012	<0.012	0
Pesticides Chloridazon	P162	0.1 µg/l	27	0	<0.004	<0.004	0
Pesticides Chlormequat	P163	0.1 µg/l	27	0	<0.003	0.009	0
Pesticides Chlortoluron	P014	0.1 µg/l	27	0	<0.012	<0.012	0
Pesticides Clopyralid	P018	0.1 µg/l	27	0	<0.009	<0.009	0
Pesticides Cyproconazole	P207	0.1 µg/l	27	0	<0.007	<0.007	0
Pesticides Diazinon	P024	0.1 µg/l	27	0	<0.01	<0.01	0
Pesticides Dicamba	P025	0.1 µg/l	27	0	<0.015	<0.015	0
Pesticides Dichlorprop	P026	0.1 µg/l	27	0	<0.009	<0.009	0
Pesticides Dieldrin	P028	0.03 µg/l	27	0	<0.008	<0.008	0
Pesticides Diflufenican	P157	0.1 µg/l	27	0	<0.01	<0.01	0
Pesticides Dimethenamid – P	P265	0.1 µg/l	27	0	<0.006	<0.006	0
Pesticides Diuron	P032	0.1 µg/l	27	0	<0.013	<0.013	0
Pesticides Epoxyconazole	P217	0.1 µg/l	27	0	<0.007	<0.007	0
Pesticides Ethofumersate	P221	0.1 µg/l	27	0	<0.015	<0.015	0
Pesticides Flufenacet	P230	0.1 µg/l	27	0	<0.005	<0.005	0
Pesticides Fluroxypyr	P040	0.1 µg/l	27	0	<0.006	<0.006	0
Pesticides Flusilazole	P159	0.1 µg/l	9	0	<0.009	<0.009	0
Pesticides Flutriafol	P039	0.1 µg/l	27	0	<0.015	<0.015	0
Pesticides Fosthiazate	P254	0.1 µg/l	27	0	<0.012	<0.012	0
Pesticides Glyphosate	P042	0.1 µg/l	27	0	<0.015	<0.03	0
Pesticides Heptachlor	P043	0.03 µg/l	27	0	<0.003	<0.003	0
Pesticides Heptachlor Epoxide – Total (Trans, CIS) (Heptachlor Epoxide)	P044	0.03 µg/l	27	0	0	0	0
Pesticides Isoproturon	P048	0.1 µg/l	27	0	<0.011	<0.011	0
Pesticides Linuron	P051	0.1 µg/l	27	0	<0.012	<0.012	0
Pesticides MCPA 4-chloro-o-tolyloxyacetic acid	P054	0.1 µg/l	27	0	<0.006	<0.006	0
Pesticides MCPP (Mecoprop)	P053	0.1 µg/l	27	0	<0.005	<0.005	0
Pesticides Metalaxyl	P209	0.1 µg/l	27	0	<0.007	<0.007	0
Pesticides Metaldehyde	P226	0.1 µg/l	27	0	<0.006	<0.006	0
Pesticides Metamitron	P194	0.1 µg/l	27	0	<0.012	<0.012	0
Pesticides Metazachlor	P203	0.1 µg/l	27	0	<0.011	<0.011	0
Pesticides Metribuzin	P152	0.1 µg/l	27	0	<0.004	<0.004	0
Pesticides Oxadixyl	P154	0.1 µg/l	27	0	<0.004	<0.004	0
Pesticides Pendimethalin	P118	0.1 µg/l	27	0	<0.012	<0.012	0
Pesticides Propiconazole	P068	0.1 µg/l	27	0	<0.014	<0.014	0
Pesticides Propyzamide	P071	0.1 µg/l	27	0	<0.011	<0.011	0
Pesticides Prosulfocarb	P243	0.1 µg/l	27	0	<0.005	<0.005	0
Pesticides Quinmerac	P244	0.1 µg/l	27	0	<0.009	<0.009	0
Pesticides Simazine	P073	0.1 µg/l	27	0	<0.011	<0.011	0
Pesticides Tebuconazole	P177	0.1 µg/l	27	0	<0.006	<0.006	0
Pesticides Terbutryn	P077	0.1 µg/l	27	0	<0.009	<0.009	0
Pesticides Triadimefon	P078	0.1 µg/l	27	0	<0.012	<0.012	0
Pesticides Tri-allate	P079	0.1 µg/l	27	0	<0.003	<0.003	0
Pesticides Triclopyr	P131	0.1 µg/l	27	0	<0.011	<0.011	0
Polycyclic Aromatic Hydrocarbons (Total by Calculation)	B011F	0.1 µg/l	107	0	0	0	0
Selenium (Total)	B009	10 µg Se/l	107	0	<0.07	<0.65	0
Trichloroethene & Tetrachloroethene – Sum Of 2 Substances (Total by Calculation)	D009B	10 µg/l	27	0	0	0	0
Trihalomethanes (Total by Calculation)	D011	100 µg/l	107	0	0	83.6172	0
Totals			4,046	0

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	256	0	<14	42.01	0
Colour	A001	20 mg/l Pt/Co	285	0	<0.7	<2.704	0
Iron (Total)	A022	200 µg Fe/l	256	0	<8	110	0
Manganese (Total)	A023	50 µg Mn/l	256	0	<0.7	3.415	0
Odour	A003	0 Dilution number at 25°C	286	0	0	0	0
Sodium (Total)	A009	200 mg Na/l	107	0	4.26	56.992	0
Taste (Taste Quant)	A004	0 Dilution number at 25°C	286	0	0	0	0
Tetrachloromethane (Total)	D008	3 µg/l	27	0	<0.19	<0.2	0
Turbidity	A002	4 NTU	285	0	<0.12	<0.24	0
Totals			2,044	0

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	285	0	<0.029	<0.064
Chloride	D002A	250 mg Cl/l	27	0	4.7	121.1
Clostridium Perfringens (Sulphite-reducing Clostridia) (Confirmed)	C004A	0 number/100 ml	60	0	0	0
Coliform Bacteria (Indicator)	C001A	0 number/100 ml	624	1	0	0
Colony Counts After 3 Days At 22øc (Colony Counts)	C007	No abnormal change	286	N/A	0	66
Conductivity (Electrical Conductivity)	D001	2500 µS/cm at 20°C	62	0	45.1	621
Gross Alpha	F004	0.1 Bq/l	1	0	<0.034	<0.034
Gross Beta	F005	1 Bq/l	1	0	<0.018	<0.018
Hydrogen ion (pH) – Indicator (Hydrogen ion) (pH)	A006	6.5 – 9.5 pH Value	285	0	6.6874	8.5342
Residual Disinfectant – Free	C009	No abnormal change	624	N/A	0.0225	0.66
Sulphate	A007	250 mg SO4/l	27	0	6	45.4
Total Organic Carbon	A017	No abnormal change	27	N/A	<0.8	2.2
Tritium	F006	100 Bq/l	1	0	<3	<3
Totals			2,310	1