GWG Watermains
Water Leak Location. GWG Watermains has been vetted and approved by TrustATrader. Covering Hertfordshire, Bedfordshire, Cambridgeshire, Essex and surrounding areas.
Membership number TT29099
Don't forget! Please mention TrustATrader when you contact any of our trusted traders.
All TrustATrader members are checked and vetted!
Get extra peace of mind and cover your next agreed job with this trader for free by registering for the TrustATrader Guarantee. Find out more
Register GuaranteeAbout GWG Watermains, Letchworth Garden City
GWG Watermains is approved Water Regs UK underground water main repair and replacements trenchless moling contractor and leakage detection specialist for replacing and repairing water supply pipes, water mains and undertaking lead renewal work.
Our highly motivated, customer orientated team of engineers have been involved with the water industry for over 25 years. We are based in Hertfordshire and cover Hertfordshire, Bedfordshire, Cambridgeshire, Essex and surrounding areas.
GWG Watermains has been involved with laying and maintaining miles of different types of water pipe of various sizes and materials, from large diameter pipes to the supply pipe that connects to your property. Our engineers have gained a considerable amount of expertise in laying and repairing water supply pipes. Highly qualified and with expert knowledge, they work efficiently and effectively providing complete peace of mind to our customers.
For added peace of mind GWG Watermains are approved contractors for:
WIAPS
EUSR
We can provide the following services:
- Find & Fix
- Water Mains Replacement
- Leak Detection & Pipe Tracing
- Common Supply Work
- Mains Laying and Diversions
- Moling (Trenchless Technologies)
- Full Site Surveys
We provide free non-obligatory quotes and estimates.
Please contact us to discuss your requirements or for free professional, friendly and helpful advice. We look forward to hearing from you or to find out more about GWG Watermains please look at our website
Don’t forget to mention Trustatrader when calling.
Photo gallery
-
Image
1
- Insuduct riser box installation
-
Image
2
- New supply into property using insuduct riser box
-
Image
3
- Leakage detection
-
Image
4
- Underground leakage location
-
Image
5
- Leakage detection works using acoustic ground mic
-
Image
6
- New external boundary box stop tap and new supply into house
-
Image
7
- Concrete reinstatement after new mains pipe laid
-
Image
8
- Impact moling under block driveway
-
Image
9
- Moling in new pipe work to meet water industry specifications
-
Image
10
- New supply pipe breakthrough into property using ducting
-
Image
11
- Trace cabling existing mains supply to locate leak
-
Image
12
- 4 x new 25mm mdpe supply’s laid for 4 new flats
-
Image
13
- 4 new supply’s laid ready for local water authority connection.
-
Image
14
- Leak in front garden running into public footpath
-
Image
15
- Leaking supply excavated
-
Image
16
- Leaking lead supply pioe
-
Image
17
- Repair made to leaking pipe work
-
Image
18
- Old rotten leaking pipe work cut out from under front garden
-
Image
19
-
Image
20
- New blue mdpe poly pipe laid to kitchen with new stop tap and connection made to existing plumbing
-
Image
21
- New mains pipe connection to existing boundary box stop tap
-
Image
22
- New supply pipe laid to correct depths
-
Image
23
- New supply being laid using impact moling
-
Image
24
- New supply pipe breakthrough into property meeting local water authority specification
-
Image
25
- New rising main connection with new internal stop tap under kitchen sink
-
Image
26
- Verge and blocks reinstatement after excavation
-
Image
27
- Concrete reinstatement after excavation
-
Image
28
- Tracing and locating water supply pipe using trace cable
-
Image
29
- Moling new supply to bypass underground leak
-
Image
30
- Impact trenches moling work
-
Image
31
- Impact moling new supply pipe across rear garden
-
Image
32
- Non operable stop tap excavated for replacement
-
Image
33
- Stop tap and tee piece section cut out for replacement
-
Image
34
-
Image
35
- New boundary box stop tap and tee piece section installed
-
Image
36
-
Image
37
- Leak under crazy paving driveway
-
Image
38
- Leak excavated and found
-
Image
39
-
Image
40
- Leak repaired on galvanised iron supply pipe
-
Image
41
- Leak on supply pipe feeding ground floor flat
-
Image
42
- Leaking black alkathene supply pipe
-
Image
43
- Repair made to leaking alkathene supply pipe
GWG Watermains
- Identification checked
- Company address verified
- Customer references checked
- Agreed to TrustATrader's high standards
- Agreed to complaints procedure
Insurance details
| Provider | Simply Business Insurance |
|---|---|
| Verified | 26th June 2026 |
Hertfordshire
Qualifications
- Water Industry Approved Plumbers Scheme - GWG Water Main Services
- EUSR - SHEA Water
- EUSR - National Water Hygiene
Associations
Reviews (51)
-
Average rating: 5.0 out of 5
Review by Gian
on 27th August 2026
Gian - Image 1 "GWG Water Mains of Letchworth recently replaced a 16-meter run of water main from the meter to my house, and I couldn't be happier with the service. From start to finish, the team was punctual, highly professional, and offered a very fair price for the project. What stood out just as much as the quality of the technical work was how neat and tidy they were throughout the job. The reinstatement work after completing the run was excellent—they left the area looking fantastic. It’s rare to find tradespeople who deliver high quality, clear communication, and respect for your property all in one package. Highly recommended!"
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 5 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0
-
Average rating: 5.0 out of 5
Review by David
on 11th August 2026
"Gareth was excellent from the start. We had a leak that had been identified by the water company but without knowing where on one of 6 properties. Gareth gave great advice on shared responsibilities and how the process works. He provided a solid plan from the outset and delivered the best approach to find the leak in an inaccessible area under our extension. The moling technique limited disruption in our garden. They had to dig a little deeper than initially expected due to a difference in garden levels between us neighbours, but Gareth and Mark took it in their stride without complaint. We were very pleased with their work and that by the end of it our patio and driveway were fully restored and carefully cleaned up as if they were never there. I can’t recommend them highly enough. Thanks"
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 5 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0
-
Average rating: 5.0 out of 5
Review by Clare
on 3rd August 2026
Clare - Image 1 "Gareth recently replaced the external supply pipe to my Victorian terraced property after we heard a leak around our internal stop cock. Works included locating the leak, excavating our patio, replacing the old pipes, installing an external stop cock chamber and reinstating the patio. He was friendly, thorough and efficient throughout. After determining where the initial leak was and assessing the state of our 80 year old pipes, he provided good advice about additional works we could do to prevent further problems and explained our responsibility regarding the shared supply to our terrace. He reinstated our patio leaving it looking very neat. I have already recommended Gareth to a colleague and wouldn’t hesitate to contact him again regarding any future work."
Trader reply: "Thanks for the review Clare and also thanks for the referral glad we could get this sorted for you ."
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 5 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0
-
Average rating: 5.0 out of 5
Review by Rob
on 24th July 2026
Rob - Image 1 "WATER MAINS REPLACEMENT After an initial diagnosis of a leak in the water mains and freeing up a seized stop tap, Gareth provided a competitive quote to install a new mains pipe. Work was carried out the next week. It was completed quickly and efficiently. It required removing and replacing some block driveway bricks. Everything was completed neatly, you cannot see where the work was done. Very pleased with the work done. Thanks."
Trader reply: "Thank you for the review Rob. Was a tough dig on a hot day but got it all done in good time . Glad we could help ."
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 5 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0
