UK SIC 2007 · 37000
Sewerage (SIC code 37000)
Sewerage is UK SIC code 37000. It sits in division 37 (Sewerage) of the SIC 2007 list. On the August 2026 Companies House register, 1,458 active UK companies list 37000 among their SIC codes. 1,337 of them list it first.
Division 37: Sewerage
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.
Related SIC codes
Who prospects SIC 37000 companies
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.
Lead generation for trades & construction →How to read SIC 37000
SIC 37000 is a five-digit code, and the digits are not arbitrary. The first two, 37, are the division, sewerage. Add the third and you have group 370; the fourth narrows it to a class, and the fifth to the subclass, which is the level Companies House actually asks a company to pick. The whole division sits under section E, water supply, sewerage and waste management, the broadest tier there is. Reading a code left to right therefore goes from a whole sector down to one activity.
More on how SIC 37000 is built
A company chooses its own codes when it incorporates and can change them on any confirmation statement. It may list up to four, and Companies House does not check whether they are right. That is why 37000 is worth reading as a claim the company made about itself rather than as a verified fact, and why the first-position and any-position counts above differ.
Measured on the August 2026 register, the busiest registered-office post towns for 37000 are London (130), Manchester (16), Glasgow (16), Bristol (16) and Bournemouth (16). Those are registered-office locations, which is where the paperwork sits rather than necessarily where the work happens, so treat them as where to start looking rather than as a service area.
Using SIC 37000 as a filter
1,458 companies is 0.03 per cent of the 5,190,464 active companies on the UK register, and ranks 37000 most used of the 1 codes we track in division 37. That is the pool before any filter. Whether it is a big market for you depends on what you sell, but it is the number every other filter on this page cuts down from.
More on filtering by SIC 37000
Almost everybody who uses 37000 means it: 1,337 of 1,458 companies put it first, leaving only 121 carrying it as a secondary code. That makes it an unusually clean filter. You can match on the code alone and trust that the companies you get really are in this line of work.
These companies are spread out. London is the largest single cluster at 9 per cent and the top five post towns together hold only 13 per cent, so the remaining 87 per cent sits across the rest of the country. A regional filter narrows this list without gutting it, which makes it a reasonable code to work territory by territory.
In practice the code on its own is rarely the whole filter. Pair 37000 with an incorporation date to catch companies in their first months, when they are still choosing suppliers, or with a filing deadline to reach them while the year end is on their mind. A worked example for this code: 37000, registered office in London, incorporated in the last ninety days, which turns a 1,458 company pool into a list you can write to in an afternoon. Add the poor-website filter if what you sell is a website, or a recent change of officer if you sell to whoever just took the job. Every company you pull carries the Companies House record, the director's name, a verified website and a verified email, and the ones we cannot complete are not charged.
Where SIC 37000 clusters in the UK
ACTIVE COMPANIES BY REGISTERED-OFFICE POST TOWN · COMPANIES HOUSE REGISTER, AUGUST 2026
SIC 37000 companies, as leads
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About SIC 37000
How many UK companies use SIC code 37000?
1,458 active UK companies list 37000 (Sewerage) among their registered SIC codes. Each company may register up to four. Of those, 1,337 put it first. The figures come from the August 2026 Companies House register snapshot, and count active companies only.
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 UK SIC 37000 companies
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