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Sewage holding tank rules in Estonia: building notice, documents and who to ask

You have chosen a sewage holding tank (reoveemahuti; in legal texts reovee kogumismahuti): a sealed tank with no outlet, emptied by a tanker (purgimine) — UK readers may know it as a cesspool or cesspit. Now comes the paperwork, and there is no single “wastewater tank Estonia regulation” to look up. The short answer: no building permit, but a building notice (ehitusteatis) before installation and a use notice (kasutusteatis) before use, both filed through the Building Register, plus what your municipality’s rules add — typically installation photos, product certificates and emptying receipts. Below: each step, and who to ask.

Which legal act governs what

Legal information last checked: 17 September 2026.

Source What it decides for a holding tank
Water Act (Veeseadus) The tank must be leak-tight (lekkekindel) and its contents taken to the reception point (purgimissõlm) named in the municipality’s water and sewerage development plan (§ 124); each municipality adopts its own rules (§ 104(7))
Building Code (Ehitusseadustik) Which notices, when, and through which register (§§ 35–37, 47–49, Annexes 1–2)
Regulation No 3 of 14 February 2020 on documenting construction How much of the installation must be documented, and who keeps the papers
Public Water Supply and Sewerage Act (ÜVVKS) Emptying organised by the water company — only in large collection areas without public sewerage (§§ 47–48)
Municipal rules for on-site wastewater treatment and removal (reovee kohtkäitluse ja äraveo eeskiri) Tank documents, setbacks, proof of emptying

Whether a holding tank is your only lawful option depends mainly on whether the plot lies in a sewage collection area (reoveekogumisala), how large that area is and whether public sewerage exists (§ 124). The Environmental Board (Keskkonnaamet) establishes these areas, and the municipality marks them in its comprehensive plan (üldplaneering) (Water Act § 99).

In short, the paperwork path is: municipal rules → building notice (at least 10 days before work) → documented installation → use notice (at least 10 days before use) → emptying receipts kept.

Before buying: check the municipality’s on-site wastewater rules

Before you order, read the rules of the municipality (kohalik omavalitsus) where the tank will stand: search Riigi Teataja for its name plus “reovee kohtkäitluse ja äraveo eeskiri”. First check that a tank is allowed on your plot at all — Rae, for example, allows a tank in an area due to be covered by public sewerage only as a temporary exception until the sewer is built, and only if the design conditions (projekteerimistingimused) or detailed plan for the building provide for it (§ 3(3)). Then look at what the tank must have, what goes with the use notice and how to prove emptying. Setbacks (kuja) are local too, as the national regulation sets none for holding tanks — see where a holding tank can go.

Three examples, not national rules:

Municipality Tank Taking it into use Emptying records
Saaremaa (rules of 2019; web page of 14.09.2026) Leak-tight, certified and/or CE-marked Manufacturer’s certificate and/or CE marking with declaration of performance, act of covered works (with photos, per the web page), location details (§ 5(4)) Invoice with address, quantity and date, kept 2+ years (§ 7(6))
Rae (wording from 1 July 2026) Certified only, installed per product instructions (§ 4(1), (5)) Use notice or use permit (§ 5(4)) Kept 2 years, shown on request (§ 6(8))
Jõelähtme (wording from 15 November 2025) Conformity with EU law, demonstrated as prescribed (§ 4(3)) Inspection and leak-tightness test if required (§ 5(10)) Receipt incl. registry code and reception point, kept 2+ years (§ 6(4)–(5))

Municipal rules are amended from time to time, so check the version currently in force.

Who to ask. Your municipality’s building or environmental specialist, who also receives the notices: Is my plot in a collection area or planned for public sewerage? Does a new sewer pipe need design documentation? What goes with the use notice?

Building notice: when and what to file

Annex 1 of the Building Code has a row for the holding tank (reovee kogumismahuti), with no size threshold. It lists a building notice for installing, rebuilding, extending, replacing a part like-for-like and demolishing the tank — and neither a building permit nor design documentation (ehitusprojekt), which a small treatment plant does need.

Two situations differ:

  • The tank is in a building-permit project. If a house’s permit design includes the tank, the permit application replaces the building notice (§ 35(5)); if the project also needs a use permit, that application replaces the use notice (§ 47(6)).
  • A new sewer pipe is laid too. Annex 1 lists a notice with design documentation for on-site water and sewer pipework (tarbimiskoha veevärgi- ja kanalisatsioonitorustik), and Saaremaa’s rules require design documentation when a pipe is built with the tank (§ 5(1)). Ask how your municipality treats the pipe from your house.

Filing (§§ 36–37):

  • Through the Building Register (ehitisregister, ehr.ee), to the municipality, at least 10 days before work starts. If the municipality announces no further checks within those 10 days, you may start.
  • The notice gives the filer’s contact details, the property and its cadastral code (katastritunnus), a description of the work, the tank’s position on the property and its purpose.
  • The municipality may add requirements or involve a neighbouring owner (§ 36(5)); it then works to building-permit time limits (§ 36(6)), so allow more than 10 days.
  • Work may proceed under the notice for four years (§ 37).

Have ready the model and dimensions from the manufacturer’s drawing, a plot sketch with distances to buildings, wells and boundaries, and the inlet depth; Saaremaa’s page asks for the notice “with the tank’s location and data”. Applying for the rural household grant? See the hajaasustuse programm article for when the notice fits in.

Documents to request from the manufacturer

Municipalities ask for papers only the manufacturer can supply, so request them with the quote, not after delivery:

Document Needed for
Model drawing with dimensions Building notice, plot sketch, your installer
Order drawing with options marked (inlet, riser, cover or hatch class, vent, alarm, anchoring) Record of what was delivered
Installation guide Your installer; rules like Rae’s require installation per the product’s instructions
Product conformity document: certificate, declaration of conformity, or CE marking with a declaration of performance The use notice, where the municipality asks for it
Use and maintenance instructions for the tank and level alarm Your own records

From Vesmaco. Per-model drawings in PDF and DWG, in Estonian, English and Russian, are in the model table; the order drawing doubles as the order confirmation you mark and sign. The documentation section on the Vesmaco homepage holds the installation guide (PDF in Estonian, dated 26 January 2016), the level-alarm data sheets and Vesmaco’s ISO 9001:2015 certificate — which certifies the company’s quality management, not the tank. The base kit includes documents; ask the supplier which ones come with your tank, which conformity document is among them and in which language, and whether use and maintenance instructions for the tank and level alarm are included. Many municipalities ask for conformity documents when the tank is taken into use. What each document proves is explained in holding tank certificates and warranties.

Documenting the installation and the use notice

How much to document. Under Regulation No 3, work done under a notice alone, with no design documentation, is documented to the extent that lets compliance be established with reasonable effort and cost (§ 1(2)–(3)). The owner keeps documents not handed to the Building Register (§ 14(4)), and the municipality may, with justification, ask for more (§ 2(5)); Saaremaa’s rules, for example, require the installation to be documented (§ 5(3)).

The act of covered works (kaetud tööde akt) records work before it is buried: what was done and where, a reasoned assessment of compliance, and how, when and by whom it was checked (§ 7(4)); photos may be added (§ 4(1)). If you build for your own needs, you sign the documents as the owner (§ 13(5)).

Photograph each stage before it is covered, following Vesmaco’s installation guide (see installation step by step): the compacted sand bed and any anchoring slab; the levelled tank with straps tensioned; backfill layers; pipe joints and the alarm cable conduit; the final position, measured from fixed points such as building corners. Undocumented work is harder to prove later. Where justified, Saaremaa may require an inspection-and-assessment act, with leak-tightness test results, from a person qualified to design or build water and sewerage systems (§ 5(4)); Rae may require an independent expert’s assessment, paid by the owner if a leak is found (§ 9(3)).

The use notice (kasutusteatis). Annex 2 lists it for an installed, rebuilt or extended tank and a replaced part. File it through the Building Register at least 10 days before you start using the tank; if no further checks are announced within those 10 days, you may start (§ 48(2)). It names the property, the structure, its purpose and the person who built it (§ 48(3)), so keep your installer’s details. Attach what your municipality asks for; the tank may then be used indefinitely unless a law provides otherwise (§ 49).

In use: proving the tank is emptied

The Water Act makes the producer of the wastewater responsible for arranging its transport to the reception point (§ 124(2)). Receipts show that you did.

  • A document every visit. Saaremaa (§ 9(2)) and Rae (§ 8(3)) oblige the emptying company to issue one; Jõelähtme obliges you to ask for it (§ 6(4)). Check that it shows the date, the address and the quantity in m³.
  • Keep receipts at least two years — the period in all three examples. Rae adds that you must show them on request (§ 6(8)).
  • Keep notices, drawings, photos and certificates while you own the tank. Saaremaa also requires a condition check of on-site facilities other than treatment plants — holding tanks included, by its definitions — at least once every five years, with the act kept for at least 10 years (§ 7(4)).

Large collection areas. If your plot is in a collection area of 2000 population equivalent or more and cannot connect because public sewerage is missing, the water company (vee-ettevõtja) must organise emptying on request (ÜVVKS § 47). Your tank must be leak-tight, hold at least two weeks’ wastewater and be accessible to the emptying vehicle; you are entitled to emptying twice per calendar month at the same per-m³ charge for removal and treatment as connected customers, plus any monthly fee (§ 48(2)–(3)). Your municipality can tell you which water company serves the area. Elsewhere, this does not apply.

Frequently asked questions

Do I need a building permit, or is a notice enough? For the tank itself, a building notice (Building Code, Annex 1). Exceptions: a tank in a house’s building-permit design is covered by that permit, and a new sewer pipe may need design documentation.

Which certificates does the municipality ask for? Local rules decide: Saaremaa names the manufacturer’s certificate and/or CE marking with a declaration of performance, Rae accepts only certified tanks, Jõelähtme requires demonstrated conformity with EU law. ISO 9001 is a company certificate, not a product one — ask what your municipality accepts before you order.

Must emptying receipts be kept? In all three example municipalities, yes, for at least two years; Rae also requires you to show them to the supervising authority on request. Check your own municipality’s rules.

Ask for the drawing and documents for your notice. Tell us the model or volume you are considering, and ask for its drawing and the documents that come with the tank — so you can complete the building notice and check them against your municipality’s rules before you order. Use the enquiry form or call +372 641 8550. Vesmaco manufactures the tanks and provides consultation, design and delivery in Estonia; filing the notices and installing the tank stay with you and your installer.

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