Sewerage (SIC division 37)
Division 37 of the UK SIC 2007 list. It holds 1 code, listed in full below with the number of active UK companies filed under each.
What sits in division 37
Also a single code, 37000, and it holds two quite different populations. One is the corporate structure around wastewater utilities, mirroring division 36. The other is a real and much more approachable market: drainage contractors, septic tank and cesspit emptying services, tanker operators and the firms that jet, survey and line private drains. The second group is where almost all the sales opportunity sits.
Tanker and jetting equipment suppliers, CCTV drainage survey kit, waste carrier licensing services and specialist insurers all sell into this division. It is a trade with heavy plant, high liability and a lot of owner-operated limited companies, which means a new incorporation is usually somebody buying their first tanker. Websites are frequently thin, so the poor-website filter finds working businesses that are hard to reach any other way.
How to read a division 37 code
A UK SIC code is five digits and division 37 is the first two of them. Everything filed under 37 shares those digits: the one code below begin 37, then the third digit narrows to a group, the fourth to a class and the fifth to the subclass a company actually picks. Division 37 sits inside section E, water supply, sewerage and waste management, which is the broadest tier of the classification. So a code is read left to right, from an industry down to a specific activity.
More on how division 37 codes are built
Companies choose their own codes at incorporation and can change them on any confirmation statement, and Companies House does not check the answer. A company may list up to four. That is worth knowing before you treat any division total as a headcount: the numbers here are what companies said about themselves, on the August 2026 register, and the largest single code in this division is 37000, sewerage.
Every SIC code in division 37
Prospecting this division
Division 37 companies, as leads
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Division 37 questions
Is a drain unblocking business really in the same code as a water utility?
Yes, and it is one of the widest ranges any single SIC code covers. 37000 spans everything from a regional wastewater operator to a one-van drainage firm. Company size is the only practical way to tell them apart, so filter on it before you write to anyone.
Do drainage contractors need a waste carrier registration?
Generally yes, if they transport waste, and it is issued by the environment agency for their nation rather than by Companies House. The public record will not tell you whether a company holds one. It is a useful thing to sell, though, which is part of why this code is worth working.
Find companies across division 37
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