The best horizontal water storage tank depends on how much water you need and whether you will keep it in place or transport it. The RomoTech 550-gallon tank is best for large-volume storage, while Norwesco’s 65- and 66-gallon tanks suit compact utility needs. WaterPrepared’s 35-gallon tank is best for portable use. The listed 1,000-gallon Elkhart tank is vertical, so it is an alternative for buyers who prioritize capacity over a horizontal profile.
| Product | Best For | Capacity | Orientation |
|---|---|---|---|
| RomoTech Polyethylene Tank | Large farm or industrial storage | 550 gallons | Horizontal |
| Norwesco Utility Tank | Compact storage and transport | 65 gallons | Horizontal |
| Norwesco Multi-Purpose Tank | Liquid or granular-material storage | 66 gallons | Horizontal |
| WaterPrepared Portable Tank | Camping and mobile water storage | 35 gallons | Horizontal |
| Elkhart Plastics Water Tank | High-capacity stationary storage | 1,000 gallons | Vertical |
RomoTech 550-Gallon Polyethylene Storage Tank
Best for: Farms, industrial settings, and other sites that need substantial liquid storage in a horizontal tank. Its 550-gallon capacity is far larger than the compact utility and portable options in this list.
The tank is made from UV-stabilized, medium-density polyethylene and has legs. The listed features say its material resists cracking, warping, and outdoor degradation, and that the tank is rustproof and BPA-free. It is described for potable water, agricultural solutions, and non-flammable industrial or chemical liquids.
Why it was selected: It combines high capacity with a horizontal, leg-supported design and broad listed liquid-storage uses. Limitation: The product description specifies non-flammable liquids, so it should not be treated as a tank for flammable substances.
Norwesco 65-Gallon Horizontal Utility Tank
Best for: Buyers who need a relatively compact horizontal tank for a trailer, service body, shed, or truck bed. Its low-profile shape is specifically described as useful where height is limited.
Integrated molded legs form the support base, rather than separate bolted-on legs. The product description says this helps provide stability on a flat surface and reduce shifting in transit. A 5-inch lid provides access for filling and the tank interior, while a 3/4-inch bulkhead fitting supports controlled drainage or transfer to a hose or pump.
Why it was selected: Its low profile, molded supports, lid, and drain fitting make it a practical choice for utility use and transport. Limitation: Its 65-gallon capacity is much smaller than the RomoTech tank, making it better for moderate needs than bulk storage.
Norwesco 66-Gallon Multi-Purpose Horizontal Tank
Best for: Buyers who want a horizontal tank for liquids or certain dry, granular materials. The listed uses include liquids as well as salt, grain, and feed.
This lightweight, sturdy tank has a 5-inch lid for filling. Molded-in strap-down grooves are designed to help secure it during transport. Those grooves are a useful distinction from the 65-gallon Norwesco model, whose listed features emphasize molded legs, a 5-inch lid, and a drain fitting.
Why it was selected: It offers a similar compact capacity to the 65-gallon option, with listed support for granular solids as well as liquids. Limitation: The provided product details do not specify a drain fitting, so buyers who need controlled hose or pump drainage should verify the configuration before choosing it.
WaterPrepared 35-Gallon Portable Utility Tank
Best for: Campers, road travelers, and people preparing a portable supply of drinking water. The tank has a horizontal design, two handles, and a compact footprint described as suitable for an ATV or camping trailer attachment.
The manufacturer lists UV-proof plastic intended to help protect stored water from sunlight. The empty tank weighs 16 pounds, which helps distinguish it from the larger stationary storage options. Its 35-gallon capacity is intended for portable utility use rather than large-scale water reserves.
Why it was selected: It is the clearest fit for buyers prioritizing portability and a smaller horizontal tank. Limitation: Its capacity is lower than the other horizontal options here, so it may not meet high-volume storage needs.
Elkhart Plastics 1,000-Gallon Water Tank
Best for: Buyers who need high-capacity water storage and can use a vertical tank. This product is not horizontal, but it is a relevant alternative when volume matters more than a low-profile form.
The listed uses include bulk water, well water storage, rainwater collection, and fire suppression. It has two 16-inch manway lids, a 1.5-inch fitting at the highest point, 2-inch fittings at the lowest point, and air bleeds. Its UV-resistant HDPE is described as dark-colored to block light, and the product listing states that it is made from virgin polyethylene and compliant with FDA and NSF/ANSI 61 standards.
Why it was selected: It provides the largest stated capacity in this comparison and includes multiple access and fitting points. Limitation: Its vertical orientation does not meet a strict requirement for a horizontal tank.
Buying Guide: How To Choose A Horizontal Water Tank
How much capacity do you need?
Match the tank size to the amount of water you need to store or move. The 35-gallon WaterPrepared model is the smallest option here; the Norwesco tanks hold 65 and 66 gallons, and the RomoTech holds 550 gallons. Choose a smaller tank for mobile or limited-space use and a larger one for substantial storage.
Will the tank stay put or travel?
For transport, look for design details that address movement and securing. The 65-gallon Norwesco has molded legs described as helping limit shifting, while the 66-gallon model has molded strap-down grooves. WaterPrepared lists two handles and a compact footprint. Confirm that the tank’s intended placement and securing method suit your vehicle or site.
What fittings and access do you need?
Check lid size and outlet details before buying. The 65-gallon Norwesco lists a 5-inch lid and 3/4-inch bulkhead fitting. The 66-gallon Norwesco lists a 5-inch lid, but the supplied details do not list a drain fitting. Access and drainage requirements can affect filling, cleaning, and transfer setup.
Does the tank need to hold drinking water?
Review the product’s stated material and intended use rather than assuming every liquid-storage tank is suitable for drinking water. The RomoTech listing describes potable water storage, and WaterPrepared describes drinking-water storage. The Elkhart listing states FDA and NSF/ANSI 61 compliance. Follow product instructions for the intended liquid.
Frequently Asked Questions
What is a horizontal water storage tank?
It is a tank designed to sit lengthwise rather than stand upright. A horizontal profile can be useful where height is limited or where a low-profile tank is preferred.
Which listed tank holds the most water?
The Elkhart Plastics tank has the largest stated capacity at 1,000 gallons, but it is vertical. Among the horizontal options, the RomoTech tank holds 550 gallons.
Which option is best for camping or travel?
The WaterPrepared 35-gallon tank is the most explicitly portable option, with two handles, a compact footprint, and an empty weight of 16 pounds.
Are all the tanks in this comparison horizontal?
No. The Elkhart Plastics 1,000-gallon tank is vertical. The other four listed products are described as horizontal tanks.
Can a horizontal tank store materials other than water?
Some listings describe other uses. RomoTech lists agricultural solutions and non-flammable industrial or chemical liquids, while Norwesco’s 66-gallon model also lists granular solids such as salt, grain, or feed. Check the product’s stated limits for the material you plan to store.