Dwr Cymru Welsh Water

North West WalesStretching from Llandudno across to the Llŷn Peninsula and down towards Towyn and covering the Snowdonia National Park, our North West Wales catchment is home to beautiful coastlines and spectacular scenery and we serve around 340,000 customers. In 2016, the area received had 16 Blue Flags awarded, including at Llyn Padarn, Wales' first designated freshwater bathing lake.

The area includes a number of water treatment works (wtw) including Dolbenmaen, Alaw and Cefni on Anglesey which benefited from a £120 million investment between 2010-2015.  We’re investing in water projects across the region this year, including:

  • £1.1 million in new water pipes Holyhead to reduce the risk of burst mains; with further water quality investment work planned in 2017.
  • Renewable energy to help us keep our energy costs down and reduces our carbon footprint, including at Llyn Celyn wtw where we have hydro turbines that can generate enough energy to power the equivalent of over 2,500 homes.

We also have a large wastewater network serving a number of wastewater treatment works (wwtw) including Treborth near Bangor, Ganol near Llandudno and Llangefni on Anglesey. We’re investing in wastewater projects across the region this year, including:

  • £4.6 million at Llanberis wwtw to protect the local environment and reduce the risk of sewer flooding.
  • £1.7 million at Treborth wwtw to tackle odour issues.
  • £21 million in Ganol “catchment” – the wastewater network around Conwy - taking surface water out of the waste network to reduce the risk of sewer flooding.

We have 166 CSOs with EDM systems in the area, located around the region. Further details can be found in the table below.

NRW / EA Name

Releases per Annum

Duration (minutes)

MOELFRE PS MOELFRE

17

6105

Y MAES CSO

30

4185

MORFA BYCHAN WWTW

109

26790

MORFA BYCHAN WWTW

1

15

TREARDDUR BAY PS (GRAVITY)

10

3075

BARMOUTH WWTW LONG SEA OUTFALL

148

48900

HARLECH TERMINAL PS (OUTFALL A)

43

23025

LLANDANWG TERMINAL PS

30

35100

NEFYN WWTW (CONT. S/WATER OUTFALL)

167

13260

LLANERCH CSO

11

375

MORFA NEFYN PUMPING STATION CSO (B)

52

6285

NEFYN WWTW

17

1140

EDERN Sewage Pumping Station CSO

5

1230

MALLTRAETH WWTW TERMINAL SPS

11

2070

COLEG NORMAL SEWAGE PUMPING STATION

6

555

FAIRBOURNE WWTW STORM TANKS

58

9840

STATION ROAD CSO

13

2325

ABERFFRAW WASTE WATER TREATMENT WKS

71

36525

ABERFFRAW SPS GLAN Y MOR ABERFFRAW

3

60

PENMAENMAWR WWTW  PENMAENMAWR

11

645

PENMAENMAWR WWTW  PENMAENMAWR

134

147810

RHOSNEIGR SPS  RHOSNEIGR

21

16950

DEGANWY PS MARINE CRESCENT DEGANWY

25

2910

TYWYN PS

49

19485

CONWY ROAD STORM PS

20

7005

LLANDUDNO JUNCTION PS

21

4650

GANOL STW PS GLAN CONWY CORNER

32

690

GANOL WWTW (STW) GLAN CONWY CORNER

68

4290

GANOL STW PS GLAN CONWY CORNER

32

690

PORTHMADOG STW STORM STORAGE   PORT

19

1935

PORTHMADOG STW STORM STORAGE   PORT

19

1935

WOODLANDS P.S WOODLANDS ESTATE MARL

0

0

BETHEL CSO BETHEL  NEAR CAERNARFON

15

2760

CHURCH RD PS CHURCH RD RHOS ON SEA

63

47010

TREBORTH STW (FINAL) BANGOR

0

12990

GLAENTRAETH ESTATE PS   BANGOR ,

0

0

LLANDEGFAN (MENAI) PUMPING STATION

57

75060

PS NO 3 (SUSPENSION BRIDGE) (EMERGE

52

18120

PS NO 3 (SUSPENSION BRIDGE) (EMERGE

52

18120

PS NO 2 (PORTH WRACH) (EMERGENCY)

0

0

PS NO 2 (PORTH WRACH) (EMERGENCY)

27

7500

PS NO 1 (FAELOG CAUSEWAY) (EMERGENC

61

20190

PS NO 1 (FAELOG CAUSEWAY) (EMERGENC

61

20190

LLYN Y FELIN PS (EMERGENCY)  , ,

71

56775

LLYN Y FELIN PS (EMERGENCY)  , ,

71

56775

EDWARD STREET   PWLLHELI ,

0

0

BAKERS LANE/CHANDLERS PLACE   PORTH

0

0

CHAPEL STREET/MADOG STREET   PORTHM

14

240

HARLECH OUTSIDE LAUNDRY   , ,

12

1485

HARLECH TERMINAL PS (OUTFALL B)

43

46755

GORAD ROAD PS (STORM/EMERG)   , ,

10

630

GORAD ROAD PS (STORM/EMERG)   , ,

4

2010

BEACH ROAD PS   BANGOR , Long Sea

80

13950

BEACH ROAD PS   BANGOR , Short Sea Outfall

4

75

ABERDYFI WHARF PS SEAVIEW TERRACE

34

21615

FELINHELI PS (ADJ TO QUAY TOILETS)

1

15

FELINHELI PS (QUAY COTTAGE)  , ,

18

8670

FELINHELI PS (OPP SEA CADET CORPS)

2

135

WENDON CAR PARK PS BENLLECH

15

4230

MOUNT FIELD P.S.   BEAUMARIS ,

11

4740

MOUNT FIELD P.S.   BEAUMARIS ,

1

30

LLANFAES PS (EMERGENCY)  , ,

18

14475

LLANFAES WWTW STORM TANK

63

18375

WENDON CAR PARK PS BENLLECH

15

4230

CSO ON SEWER (CRICCIETH BEACH)   ,

7

570

CRICCIETH WEST PS   , ,EO

39

13815

CRICCIETH WEST PS   , ,Storm

22

10770

CRICCIETH EAST PS   , ,EO

22

10770

CRICCIETH EAST PS   , ,Storm and EO

25

16485

BRYNSIENCYN PS   , ,

12

5760

BRYNSIENCYN PS   , ,

12

5760

BRYNSIENCYN STW SETTLED STORM  , ,

26

21120

NEWBOROUGH STW

29

27570

PENTRAETH STW

56

54330

QUAY PS CONWY QUAY CONWY

13

285

PENRHYN BAY LLANDUNDNO ROAD -

3

465

YNYS LAS PS

16

14640

TALYBONT STW

32

14550

FRYARS BAY P.S- SCREENED EMERG

0

0

MARL DRIVE CSO LLANDUDNO JUNCTION

12

5250

NEWBOROUGH MILLBANK SPS

23

10875

TREARDDUR BAY HAUL A MOR SPS

6

1110

BRYN DU SEWAGE PUMPING STATION

30

22395

LLANSADWRN PS

18

20280

LLANDDANIEL PONT Y CRUG SPS

37

33450

PENTRAETH TAN Y GRAIG SPS

3

45

FAIRBOURNE PUMPING STATION

24

8115

GLANWYDDAN PUMPING STATION

13

6090

DEGANWY BEACH SPS

1

15

LLANFAIRFECHAN HOSPITAL SPS

6

1050

LLANDUDNO LLANRHOS SPS

5

645

MALLTRAETH VILLAGE PUMPING STATION and CSO

8

1455

DWYRAN RHYDWYN - SSO

50

22500

DWYRAN BY SCHOOL - SSO

36

9825

ARTHOG TERRACE SEWAGE PUMPING ST

19

6390

CASTELL PUMPING STATION

0

0

GLASFRYN TERRACE STW  ARTHOG

0

0

TREARDDUR BAY PS (PUMPED DISCHARGE)

84

14055

BALACLAVA ROAD SEWAGE PUMPING ST

1

15

CAERNARFON PONT SEIONT PS

28

6915

CROSSVILLE CSO

55

5670

CAERNARFON MARGARET STREET - S

57

6045

MIN-Y-NANT CSO

15

945

ST. AGNES ROAD CSO

37

6240

LLANFAIRFECHAN - SSO

216

74730

PENRHYN BAY LLANDUNDNO ROAD -

52

5085

LLANDUDNO  JUNCTION GLAN Y MOR ROAD

116

34620

ST MARY'S SEWAGE PUMPING STATION

3

585

WESLEYAN TERRACE SEWAGE PUMPING ST

2

30

MORFA GARREG PS   PWLLHELI

8

540

GLAN Y DON PS   PWLLHELI

7

525

BRIDGE GARAGE PWLLHELI

0

0

LON COB BACH PS   PWLLHELI

43

14565

ABERSOCH HARBOUR PUMPING STATION

8

990

ABERDARON PS

8

1755

BRITANNIA PS

8

3990

BORTH Y GES PS

55

11700

AMMANDA TERRACE BORTH Y GEST PORTHM

1

15

PENMAENMAWR PROMENADE PS

16

4125

PENRHYN HILL PENRHYN BAY

2

30

CYNLAI PS LLANGOED ANGLESEY

5

1530

MALLTRAETH VILLAGE PUMPING STATION and CSO

8

1455

WATERLOO PORT SEWAGE PUMPING ST

9

4860

GLYN GARTH PS LLANDEGFAN

21

17580

RHIANFA PS LLANDEGFAN

42

18030

WEST END PS BEAUMARIS ANGLESEY

27

7065

GIMBLET ROCK TIDAL TANK   PWLLHELI

0

0

THE ANTELOPE SEWAGE PUMPING STATION

6

270

MORFA PS MORFA DRIVE MORFA CONWY

4

75

PENRHYN BAY PS MORFA RD PENRHYN BAY

18

10575

GLAN CONWY SPS

62

65025

ANGLESEY ARMS PUMPING STATION

57

10035

MARINE RD CSO MARINE RD COLWYN BAY

1

30

BONTDDU STW

213

199875

NEFYN PUMPING STATION

70

43680

LLYSFAEN

0

0

GLAN Y MOR PUMPING STATION

5

225

BARMOUTH HARBOUR PUMPING STATION

3

105

RHOSLAN PS RHOSLAN LLANDUDNO

2

30

DEGANWY ROAD DEGANWY

46

5175

MALLTRAETH WWTW - STORM

29

29340

ABERGWYNGREGYN PUMPING STATION

15

17460

MAWDDACH CRESCENT PUMPING STATION

3

75

BRYNCOCH SEWAGE PUMPING STATION

10

6255

FRIOG SEWAGE PUMPING STATION

2

375

IND ESTATE LLANDUDNO JUNCTION  GLAN

1

330

PENMAENMAWR WWTW  PENMAENMAWR

11

2505

HENDRE ROAD SSO CONWY

7

300

LLEINIOG PS

36

17280

PONT Y BRENIN PS

14

5925

BETHEL SSO NO. 3

90

11295

BETHEL SSO NO. 2

58

5955

BETHEL SEWAGE TRANSFER PS

65

74640

LLANFAIRPWLL SSO NO. 2

1

15

SSO AT MILL LANE CAERNARFON

82

13185

CAERNARFON BANK QUAY PS

0

0

CAERNARFON WWTW INLET PUMP ST 6MM

1

15

CAERNARFON WWTW STORM TANKS

3

45

LLANFAIRFECHAN SSO NO. 1

99

30780

CAERNARFON - GLANRHYD SSO NO.

45

18555

PONT LLANDEGFAN SEWAGE PUMPING STAT

54

66000

TREMADOG SSO

2

90

SNOWDON STREET PS   PORTHMADOG

0

8640

PORTHMADOG - LOMBARD STREET SS

72

4875

PORTHMADOG STW STORM STORAGE   PORT

3

285

DYFFRYN ARDUDWY WWTW STORM

33

26730


Aa