Do slow-draining sinks always mean a blocked drain? +
Not always. A slow-draining sink is often caused by a localised blockage in the waste trap or the pipe immediately beneath the sink — hair, soap scum and grease are common culprits. However, if multiple fixtures are draining slowly or you notice gurgling sounds, the problem is likely further down in the main drain. A drainage engineer in Cambridge can distinguish between a simple waste pipe blockage and a more serious drain issue.
What is the NADC and why does it matter? +
The NADC — National Association of Drainage Contractors — is the leading UK trade body for drainage professionals. NADC members must demonstrate competence, carry appropriate insurance, and adhere to a code of practice. Choosing an NADC-registered drainage engineer in Cambridge gives you confidence that the work will be carried out to professional standards with proper equipment.
Who is responsible for drains — me or the water company? +
You are responsible for private drains within your property boundary. Since October 2011, lateral drains (the section that runs from your boundary to the public sewer) and the public sewer itself are the responsibility of your local water company. If a blockage is beyond your property boundary, contact your water company first — they will clear it at no charge. A drainage engineer in Cambridge can help identify where the blockage is.
How often should I have my drains surveyed? +
For most domestic properties, a CCTV drain survey every 3 to 5 years is sufficient to catch problems early. If you have mature trees near your drains, older clay pipes, or a history of blockages, consider annual surveys. You should also commission a drain survey before buying a property — it can reveal expensive problems like collapsed sections or root intrusion that are not visible from the surface.
What causes a foul smell from my drains in Cambridge? +
Foul drain smells are usually caused by a dried-out trap (the U-bend), a cracked or disconnected pipe, or a blockage building up in the system. If the smell is coming from outside, it could indicate a broken manhole cover seal or a collapsed section of drain. Run water through any infrequently used sinks or showers to refill their traps first. If the smell persists, a CCTV drain survey will identify the cause.
What equipment should a professional drainage engineer have? +
A properly equipped drainage engineer should have high-pressure water jetting equipment (typically 3,000+ PSI), a CCTV drain camera for surveys, electro-mechanical cleaning machines, drain rods, and root cutting attachments. They should also carry personal protective equipment (PPE) including gloves, eye protection and waterproof clothing. Be wary of anyone who turns up with just a set of drain rods — they will struggle with anything beyond a minor blockage.