GWG Watermains
Lead Pipe Replacements. GWG Watermains has been vetted and approved by TrustATrader. Covering Hertfordshire, Bedfordshire, Cambridgeshire, Essex and surrounding areas.
Membership number TT29099
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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
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- Insuduct riser box installation
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- New supply into property using insuduct riser box
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- Leakage detection
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- Underground leakage location
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- Leakage detection works using acoustic ground mic
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- New external boundary box stop tap and new supply into house
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- Concrete reinstatement after new mains pipe laid
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- Impact moling under block driveway
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- Moling in new pipe work to meet water industry specifications
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- New supply pipe breakthrough into property using ducting
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- Trace cabling existing mains supply to locate leak
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- 4 x new 25mm mdpe supply’s laid for 4 new flats
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- 4 new supply’s laid ready for local water authority connection.
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- Leak in front garden running into public footpath
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- Leaking supply excavated
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- Leaking lead supply pioe
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- Repair made to leaking pipe work
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- Old rotten leaking pipe work cut out from under front garden
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- New blue mdpe poly pipe laid to kitchen with new stop tap and connection made to existing plumbing
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- New mains pipe connection to existing boundary box stop tap
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- New supply pipe laid to correct depths
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- New supply being laid using impact moling
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- New supply pipe breakthrough into property meeting local water authority specification
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- New rising main connection with new internal stop tap under kitchen sink
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- Verge and blocks reinstatement after excavation
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- Concrete reinstatement after excavation
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- Tracing and locating water supply pipe using trace cable
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- Moling new supply to bypass underground leak
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- Impact trenches moling work
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- Impact moling new supply pipe across rear garden
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- Non operable stop tap excavated for replacement
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- Stop tap and tee piece section cut out for replacement
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- New boundary box stop tap and tee piece section installed
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- Leak under crazy paving driveway
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- Leak excavated and found
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- Leak repaired on galvanised iron supply pipe
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- Leak on supply pipe feeding ground floor flat
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- Leaking black alkathene supply pipe
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- 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 | 10th June 2025 |
Hertfordshire
Qualifications
- Water Industry Approved Plumbers Scheme - GWG Water Main Services
- EUSR - SHEA Water
- EUSR - National Water Hygiene
Associations
Reviews (42)
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Average rating: 5.0 out of 5
Review by John
on 3rd March 2026
"After finding out there was a leak at an elderly relative's property, we found GWG Watermains via the Water Safe recommended list of companies. As we lived some 50 miles away, we arranged to meet Gareth at the property for a site visit. He explained the process for tracing the leak and sent us a quotation covering what was discussed. He managed to fit us in for the repairs early in the following week. We arranged to meet Gareth on site again and the work was carried out within 5 hours. This included replacing the main feed from the boundary to the house, a new stopcock and plumbing into the existing internal pipework. All the outside areas were made good, with soil/turf put back as before and concreting the small hole in the path by the front door. The work was carried out professionally and we received a Certificate of Compliance to cover the repairs. We were grateful that Gareth made a very stressful situation less so, for being punctual and helpful at every point."
Trader reply: "Glad we could help John. Thanks for the review"
- 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
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Average rating: 5.0 out of 5
Review by Stephen
on 9th February 2026
"Many thanks to Gareth at GWG who replaced our water main on Monday. It was an urgent job and Gareth was extremely quick to come out and inspect then send a quote. The work was done quickly because they managed to slot us in and the guys made good the holes and disruption so you wouldn’t know they’d been! I would happily recommend GWG and wouldn’t hesitate to have them back. Steve"
- 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
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Average rating: 5.0 out of 5
Review by Mark
on 30th January 2026
"Punctual, responsive, tidy and professional. Kept me informed throughout the job - would highly recommend"
- 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
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Average rating: 5.0 out of 5
Review by Caroline
on 11th December 2025
Caroline - Image 1 "Gareth and team did an amazing job repairing our burst water pipe. They found a great solution and were able to replace the main water pipe to the house in the process. Their quote was competitive and the work was completed in time and within budget. We would highly recommend them."
Trader reply: "Many Thanks for the review . Glad we could help Caroline"
- 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
