Potable water tanks with PZH certificate

We design and build steel, above-ground drinking water tanks with PZH certificate, which are used in SUW water treatment plants and as reserve drinking water tanks for social and living purposes.

Miltom tanks provide optimal conditions for storing drinking water. The solid and tight construction guarantees that no dirt or foreign bodies can get inside.

Our offer

Storing drinking water is much more complicated than, for example, process water. Drinking water must be safe for consumption at all times and the appearance of microorganisms dangerous to health and life is unacceptable.

Well-designed drinking water tanks have certificates proving their safety and long-term warranties. To make water collection hygienic, the tanks are equipped with stainless steel connections.

Choosing the correct drinking water tank

When choosing a drinking water tank, we should be sure that the water stored in it will not biodegrade or become polluted. That is why the appropriate quality of the material and the type of tank construction used are so important.

Drinking water tanks produced by Miltom are tight, steel structures of various capacities, specially prepared for storing water for food and social needs for SUW water treatment plants, agriculture and breeding. They will meet even the most complex requirements set by the customer, while ensuring compliance with legal and sanitary standards for drinking water tanks.

Etapy konstruowania zbiornika na wodę pitną z atestem pzh

Safety confirmed
by a certificate

Using the highest quality materials, we guarantee that each tank we build will be resistant to temperature changes, unfavorable weather phenomena and other external factors.

The internal surfaces of the food water storage deposits we offer, which are in contact with drinking water, are protected with coatings with Hygienic Certificates of the National Institute of Hygiene, are approved for use by PN-EN and have a current certificate of the National Institute of Public Health issued for the entire structure of the tank along with the items contained in it. devices.

The structure of the above-ground drinking water tank consists of steel panels with dimensions of 2.5 m x 1.25 m, connected together using hot-dip galvanized screws, made of acid-resistant steel or covered with specialized powder paint in a color chosen by the customer from the RAL palette we offer.

Zbiornik na wodę pitną, socjalno-bytową z atestem PZH

A tank designed especially for you


The tanks we produce are used both to store drinking water and to compensate for fluctuations resulting from changing water demand.

The tightness of the above-ground tank is ensured by individually prefabricated steel panels for each project, painted on the inside with epoxy paint with a chemical seal and a polymer mass approved for contact with drinking water.

Depending on the type of sealing chosen by the customer, in Miltom workshops we make internal insulation with XPS panels on the entire surface of the tank walls and an external layer with high-quality mineral wool, additionally protected by us with a trapezoidal sheet façade in any color from the RAL palette.

We adapt the technical equipment of the drinking water tank to the individual and specific needs of the Ordering Party, while ensuring that all formal requirements specified by law are met, adapting the tank to use in accordance with its intended purpose.

Variants of the roof of a steel drinking water tank


A very important element of the tank is the type of roof used in its structure. The roof is supposed to ensure the tightness of the deposit and prevent dirt from getting inside.

The roofs of drinking water storage tanks that we use are dome-shaped or conical self-supporting structures with an external slope, made according to a concept based on trapezoidal forms or from laminated prefabricated elements. These materials are characterized by high resistance to UV rays and difficult weather conditions, which is important considering the long period of planned operation.

The surface sealing of the roof units used in our designs excludes the possibility of dirt, insects and rainwater from entering the tank.

The structure is selected individually for the project

The roof structure can be made in several variants we offer, providing the customer with the opportunity to select an individual solution optimally tailored to his needs.

Drinking water tanks built by Miltom have the necessary hygiene certificates of the National Institute of Hygiene and are used in food processing, horticulture, agriculture as well as in SUW water treatment plants.

Prefabricated laminated elements

Conical type roof

Trapezoidal sheet metal T35


The drinking water tanks we design are made in accordance with rigorous safety standards:
PN-EN 1993-1:2006 / AC:2009 Design of steel structures
They have a current PZH certificate for the entire tank

Reliable solutions

Advantages of our tanks

Important information

The tanks we build for storing drinking water have a current PZH certificate, so they can be used in food processing, water supply networks, animal breeding and all types of industrial and manufacturing plants where safe and clean water is necessary.


The structure is made of galvanized steel, protected with polyester or epoxy powder paint.

Drought protection

Drinking water tanks can store large amounts of water for use during droughts, protecting people and animals from the effects of water shortages.


In our structures we use acid-resistant steel AISI 304 (1.4304) or AISI 316L (1.4401).

Energetic efficiency

By properly planning the location of drinking water tanks, it is possible to reduce losses in energy consumption needed for its transport.


Thanks to the design used, the internal walls of the tank do not enter into chemical reactions with cleaning agents when washing the tank. This ensures that the water is permanently suitable for consumption.

Warranty package

Warranty protection and additional post-warranty packages from Miltom


Any existing steel drinking water tank – both built by us and other manufacturers – can be covered by our warranty and service. The service is provided after purchasing the warranty protection package we offer. The basis for issuing such a guarantee is that we carry out a technical inspection of the existing drinking water tank before signing the contract.


Technical Specifications

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A range of types of drinking water tanks

Performance standards

  • PN-EN 1990:2004/AC:2010 „Eurocode. Basics of structural design.
  • PN-EN 1991-1-1:2004/AC:2009 „Eurocode 1. Impacts on structures. Part 1-1. General impacts. Volumetric weight, self-weight, operational loads in buildings.
  • PN-EN 1991-1-3:2005/AC:2009 „Eurocode 1. Impacts on structures. Part 1-3. General impacts. „Snow load.”
  • PN-EN 1991-1-4:2005 „Eurocode 1. Impact on structures. Part 1-4: General impacts. Wind Impacts.
  • PN-EN 1993-1-1:2006/AC:2009 „Eurocode 3: Design of steel structures. Part 1-1. General rules and rules for buildings.
  • PN-EN 1993-1-3:2008/AC:2009 „Eurocode 3. Design of steel structures. Part 1-2: General rules. Supplementary rules for structures made of cold-formed sections and sheets.
  • PN-EN 1993-4-2:2009 „Eurocode 3. Design of steel structures. Part 4-2: Tanks.”
  • PN-EN 1993-1-6:2009 „Eurocode 3. Design of steel structures. Part 1-6: Strength and stability of shell structures.
  • PN-EN 1090-2+A1:2012 „Execution of steel and aluminum structures. Part 2: Technical requirements for steel structures.
  • PN-EN ISO 13788:2013-05 „Thermal-humidity properties of building components and building elements. The internal surface temperature necessary to avoid critical surface humidity and interlayer condensation. Calculation methods.”
  • PN-EN 12831:2006 „Heating installations in buildings. Method for calculating the design thermal load.
  • PN-EN ISO 12944-2:2018-02 „Paints and varnishes. Corrosion protection of steel structures using protective painting systems. Part 2: Classification of environments.”
  • PN-EN ISO 12944-5:2020-03 „Paints and varnishes. Corrosion protection of steel structures using protective painting systems. Part 5: Protective paint systems.
  • PN-EN ISO 14713:2000 „Protection against corrosion of steel and cast iron structures. Zinc and aluminum coatings. Guidelines.”

Tank design

Foundation slab

MILTOM system tanks intended for storing drinking water are placed on a reinforced concrete foundation slab. The reinforced concrete foundation slab is designed individually for a specific location, based on the soil and water conditions received from the Investor. It is made of hydrotechnical concrete, min. class B25 (C20/25) W8 F100, frost-resistant and waterproof. Reinforcement of the tank bottom plate with top and bottom steel class A-IIIN BSt500. Reinforcement cover from the bottom and sides 5 cm, from the top 7 cm. The bottom slab is made on a B10 concrete base, at least 10 cm thick. The diameter of the foundation slab is made in the form of a circle or polygon with a diameter of approximately 0.9 m larger than the internal diameter of the tank.

For calculations of the strength of the foundation, only the weight of the water collected in the tank can be taken into account. The weight of the structure and piping is up to 2% (for tanks up to 300 m3) to 5% of the weight of water. Therefore, it can be omitted by using other safety factors resulting from, for example, the possibility of tank overfilling. The decision on the design weight of the tank and the size of the safety factors rests with the designer.

Technologies used

The drinking water tanks we produce are made using two technologies. With an internal membrane made of EPDM or with joint sealing of sheet metal joints, type Sabatack 750 or 780.

The tank is sealed with an EPDM membrane

certified by the National Institute of Hygiene, is placed on a properly prepared and maintained foundation slab. The membrane is a polymer geosynthetic barrier manufactured from vulcanized EPDM. Calendered in two layers, without reinforcement. This gives unique properties, especially in terms of flexibility and elasticity (300% extensibility). The membrane is separated from the tank foundation with a polypropylene geotextile with a grammage of 300g/m2, which protects it against mechanical damage during installation and operation.

Sabatack sealed tank structures

are placed in a previously prepared technological groove 45 mm wide and 50 mm deep, located at the height of the circumference of the tank shell structure. In order to permanently and tightly connect the tank walls with the bottom plate, the tank groove is filled with self-leveling mortar from SABA.After the resin has hardened, the groove is additionally secured with a permanently elastic mass called Ecoseal Bio HM, which is approved for contact with drinking water. The bottom of the tank is additionally protected with Aquafin-1K M-PLUS mortar.

Tanks with sealing and protection of all connections of the tank shell elements with Sabatack 750, 780 mass are painted on the inside with Faproxyd 620 powder paint in signal blue (RAL5005) from WODROL.

Tank walls

In both technologies, the tank walls are made of galvanized steel of the S350GD + Z275 grade or acid-resistant AISI 304 (1.4304) or AISI 316L (1.4401) steel with sheet dimensions of 1.25 m x 2.5 m. The thickness of the jacket depends on the size of the tank and the required standards. . Individual sheets are screwed together vertically and horizontally using M12 screws, class 8.8. The walls of the tank are reinforced horizontally with rings made of 2.0 – 4.0 mm thick sheets. The tank is attached to a concrete foundation using galvanized L70x50x5 angles made of S235 steel, brackets and expansion anchors.

Additional options

At the customer’s request, it is possible to powder-coat the sheet metal surfaces or cover the installation jacket with a trapezoidal sheet in a selected RAL color from the available „Pruszyński” color palette.

Painting the tank shell or the façade made of trapezoidal sheet metal constitutes an additional layer of protection against the effects of the external environment, significantly prolonging the proper operation of the tank and its failure-free operation, and also provides an additional visual and aesthetic effect.

Tank roof

Depending on the investor’s needs, we cover drinking water tanks with a dome made of a polyester-glass composite or with a conical roof. All the roofs we offer are self-supporting structures, which means there is no contact of water with the structure elements, significantly extending their service life.

The use of a roof covering in the form of a „KS” dome (self-supporting dome).

This cover consists of spherical elements (i.e. the shell of the element is a segment of a sphere) with side flat flanges lying on the spherical surface of the sight glass, the sight glass cover and the drip cap (without gutter) around the entire circumference of the tank. The spherical elements are connected together using an overlapping screw connection. Each lap screw connection of the flanges of the covering elements is sealed with two rows of EPDM gaskets with a cross-section of 10×15 [mm]. The distance between the axes of the screws and anchors securing the cover elements to the steel structure of the tank is not greater than 330 [mm]. Between the flange of the outermost element and the steel structure there is a drip cap made of polyester-glass laminate. Between the drip cap and the tank wall and between the drip cap and the covering elements, there are two rows of EPDM gaskets with a cross-section of 10×15 [mm]. Spherical elements made of polyester-glass laminate insulated with 60 [mm] thick PU foam – the foam is not placed in the places of screw connections.

Conical tank roof structure (truncated cone)

it is pivotally supported on the walls of the tank. The angle of the roof is approximately 15º. Roof load-bearing beams made of cold-bent galvanized profiles. Pruszyński sheets 2xC150x48x2.0 made of S350GD steel are radially evenly spaced. Roof load-bearing beams fastened in the roof crown with a round keystone with a diameter of d = 856 mm and an equivalent design I-shaped cross-section Hśr x Bpg x Bpd = 172x344x158 welded from steel sheets of thickness. 8 mm made of S235 steel. Connection of load-bearing beams with the keystone using M12-class 8 screws. Styrodur-3000CS insulation with a thickness of 100 mm was placed between the load-bearing beams. The roof is covered with flat sheet metal with a thickness of 1.0 to 3.0 mm. All roof connections in the tank are protected from the inside with Sabatack. The shape of the roof structure ensures free drainage of rain and snow from the roof surface to each side of the tank.

Tank equipment

Regardless of the shape and type, each drinking water tank roof is equipped with:

Supply ventilation chimneys (air intakes) enabling free air flow into the space under the roof covering (protecting the roof covering against negative pressure caused by the variable level of liquid in the tank); gravitational air inflow is assumed.
Pipe stubs permanently laminated into the roof covering to connect the ventilation system for collecting polluted air from the space under the roof covering. The number, size and location of the spigots are determined by the ventilation designer. Designed solutions must be consulted with the roof covering manufacturer.
Manhole – pronounced inside 800 x 800 [mm] The hatch is equipped with hinges and tilt limiters for an opening angle of up to 95°. The fittings are made of A4 steel. The location of the manhole, spigots and ventilation chimneys is agreed at the stage of detailed technical arrangements for the covering.
A filter protecting against the entry of insects, rodents, birds and dust, made of stainless steel mesh with a mesh size of 0.5 mm, is placed in the ventilation chimney, which also prevents the entry of atmospheric pollutants.
Each tank is equipped with external thermal insulation made of ProRox SL 960 PL mineral wool, 10 cm thick, additionally protected with trapezoidal sheet metal T18 x 0.7 „Pruszyński” painted in any color from the RAL color palette. This location of the insulation ensures long-term preservation of thermal properties and no degradation of the material under the influence of moisture.
The tank equipment also includes: a supply (pressure) pipeline, a suction pipeline, an overflow pipeline and a discharge pipeline, made of acid-resistant steel or polyethylene with a diameter adapted to the requirements of the Ordering Party.

All the materials we use ensure that the investor is provided with the highest quality product that meets the strict requirements of norms and required standards.

The full modularity of the structure allows for quick assembly, as well as the possibility of any modifications to increase the required tank capacity, if necessary. Our tanks are equipped with all the necessary connections and devices required for efficient operation in water treatment plants and water supply installations.High quality of workmanship allows you to obtain a long-term warranty, ensuring many years of trouble-free use of the tank.

Call or write to
our expert →

Each water storage tank is different, which is why we offer a free consultation at the stage of preparation for the project


We will help you choose the right dimensions and parameters of the tank, tailored specifically to your investment.

Water storage tanks

Krzysztof Polak