The 7 Best Drainage & Sewage in Cardiff 2026

Ranked by real customer reviews, listing activity and Companies House registration, from public sources.

How this ranking is calculated

Composite score from public signals:

  • Google Business Profile star rating (when 3+ reviews)
  • Google Business Profile review count (log-scaled)
  • How many public profile links the listing carries: Companies House number, Google Business Profile, other directory profiles the business has supplied, its own website
  • Whether the listing has been claimed by its owner

No business can pay to be listed, and no reviews are fabricated. Placement is influenced by an optional paid Premium subscription, which puts a business ahead of equally-scored rivals here. Premium businesses carry a Premium badge on their own profile page and in our directory listings, but this list does not mark them.

  1. City Drains is a drainage specialist in Cardiff, rated 5/5 from 313 Google reviews. Registered with Companies House (no. 15501578) and currently active. Established Google Business Profile with 313+ customer reviews.

    5.0★ (313 reviews)3 public profile links
    5.0★
    313 Google reviews

  2. Drainmen Ltd is a drainage specialist in Cardiff, rated 5/5 from 123 Google reviews. Registered with Companies House (no. 04819743) and currently active. Established Google Business Profile with 123+ customer reviews.

    5.0★ (123 reviews)3 public profile links
    5.0★
    123 Google reviews

  3. M Thomas Water Services Ltd is a drainage specialist in Cardiff, rated 4.7/5 from 12 Google reviews. Registered with Companies House (no. 04034298) and currently active. Verified Google Business Profile.

    4.7★ (12 reviews)3 public profile links
    4.7★
    12 Google reviews

  4. Cardiff Drain Cleaning Company is a drainage specialist in Cardiff, rated 3.1/5 from 8 Google reviews. Registered with Companies House (no. 04845253) and currently active.

    3 public profile links
    3.1★
    8 Google reviews

  5. Clark Drainage is a drainage specialist in Cardiff, Wales. Registered with Companies House (no. 08295688) and currently active.

    3 public profile links
  6. Companies House registered
  7. Companies House registered

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