| High-Density Polyethylene (HDPE) | Rotomolded vertical, horizontal, or underground tanks | Approximately 200–50,000 liters | Lightweight, seamless construction, easy transport, impact resistance, and low maintenance | Excellent against rust and many common water-treatment chemicals | Rainwater harvesting, household supply, agricultural storage, and emergency water reserves | Use only tanks manufactured from approved materials for drinking-water contact and protected from excessive heat and ultraviolet exposure | Can deform under excessive heat or poor support; generally unsuitable for high-pressure storage |
| Glass-Fused-to-Steel | Bolted sectional panel tank | Approximately 50,000–4,000,000 liters or more | Factory-fused glass coating, modular installation, hygienic internal surface, and suitability for large projects | Excellent when the glass coating and panel joints are properly maintained | Municipal water supply, fire protection, industrial process water, and large-scale storage | Interior coating, sealants, fittings, and access components must comply with local drinking-water requirements | Requires careful transport and installation; chipped coating or damaged joints must be repaired promptly |
| Epoxy-Coated Steel | Welded or bolted steel tank with protective lining | Approximately 20,000–2,000,000 liters | High structural strength, flexible sizing, and good suitability for engineered commercial systems | Good when coating thickness, surface preparation, and inspection are properly controlled | Commercial buildings, industrial facilities, fire-water systems, and municipal installations | The coating system must be certified or approved for contact with potable water; regular inspection is important | Coating damage can lead to localized corrosion; field repairs may require surface preparation and curing time |
| Stainless Steel | Welded cylindrical or panel tank | Approximately 1,000–500,000 liters | Strong, hygienic, visually clean, and highly resistant to many atmospheric and water-related conditions | Excellent with an appropriate grade and proper fabrication | Drinking water, food processing, hospitals, commercial facilities, and high-hygiene installations | Select a grade compatible with chloride levels and local water chemistry; welds should be properly finished and passivated | Higher initial cost; unsuitable grades or exposure to high chlorides can cause pitting or stress-related corrosion |
| Reinforced Concrete | Cast-in-place, precast, or underground tank | Approximately 100,000–10,000,000 liters or more | Very high structural capacity, thermal stability, long design life, and efficient use for underground storage | Good when concrete quality, waterproofing, and crack control are properly managed | Municipal reservoirs, fire-water storage, agricultural systems, and large underground tanks | Internal waterproofing or a suitable lining may be required to protect water quality and prevent leakage | Heavy construction, longer installation time, potential cracking, and difficult modification after completion |
| Fiberglass-Reinforced Plastic (FRP) | Factory-molded cylindrical or sectional tank | Approximately 500–500,000 liters | Low weight, good chemical resistance, smooth internal surface, and relatively simple installation | Excellent against many chemicals and naturally non-rusting environments | Industrial water, process water, agricultural use, rainwater collection, and selected potable-water systems | Resin, liner, fittings, and manufacturing process should be approved for the intended water-contact application | Can be affected by impact, ultraviolet exposure, or poor support; field cutting and repairs require specialized methods |
| Polypropylene (PP) | Welded sheet or fabricated process tank | Approximately 500–100,000 liters | Low density, strong chemical resistance, and suitability for specialized water-treatment environments | Excellent against many acids, alkalis, and salts | Water-treatment plants, chemical dosing areas, industrial process water, and corrosive environments | Material certification and temperature limits should be verified before use in drinking-water storage | Lower stiffness than steel, thermal expansion, and sensitivity to prolonged high temperatures or ultraviolet exposure |
| Flexible PVC or Reinforced Fabric | Collapsible bladder, pillow tank, or temporary storage tank | Approximately 1,000–500,000 liters | Rapid deployment, compact empty storage, low foundation requirements, and easy relocation | Good when the fabric, coating, and fittings match the stored water | Emergency relief, construction sites, temporary agriculture, remote communities, and disaster response | For drinking water, the liner and all wetted components must be approved for potable-water contact | Vulnerable to puncture, abrasion, sharp objects, and unsuitable ground conditions; not ideal for permanent high-demand systems |