GWG Watermains
Water Mains Replacement. 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 | 26th June 2026 |
Hertfordshire
Qualifications
- Water Industry Approved Plumbers Scheme - GWG Water Main Services
- EUSR - SHEA Water
- EUSR - National Water Hygiene
Associations
Reviews (49)
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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
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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
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Average rating: 5.0 out of 5
Review by Mark
on 22nd June 2026
"Gareth and Mark worked on detecting an unfound leak beneath our home. Where technology had failed they listened and found the leak eventually leading us to re-route our mains pipe. They did excellent work getting us back to no leaks. 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
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Average rating: 5.0 out of 5
Review by Austin Bootle
on 18th June 2026
"Excellent job. Done quickly at short notice and left everything extremely tidy. Would 100% 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
