You walk into a ranch supply store and there's four different stock tanks staring at you. Galvanized steel. Polyethylene. Concrete. Heavy rubber. They're all called "stock tanks." The prices vary by 3x. Which one belongs on your place?
Here's the trade-off matrix we use when ranchers ask, broken down by what actually matters on a working operation.
Galvanized steel stock tanks
The classic. The one you picture when someone says "stock tank."
Pros:
- Cheapest per gallon for the most common sizes (50–300 gallon)
- Hot-dipped galvanization holds up well — a quality tank lasts 15–20 years in normal use
- Easy to add a tank heater for winter
- Resists UV damage indefinitely
- Repairable if you ever puncture one (weld or epoxy patch)
Cons:
- Can rust at welds and rims over time, especially in humid climates
- Cattle and horses can scrape galvanization off the inside edges over years
- Won't survive a hard kick from a bull or a hit from equipment without denting
- Heavier than poly for the same volume
When to choose galvanized: Most working ranches. It's the right answer for 80% of installations — reliable, repairable, and the lowest cost of ownership over 15 years.
Polyethylene (poly) stock tanks
The modern alternative. HDPE plastic, usually black or dark green.
Pros:
- Won't rust, ever
- Lighter — easy to move when empty
- UV-stabilized poly holds up well for 10–15 years
- Quieter for skittish animals (no metal echo)
- Can take a hard hit without denting permanently
Cons:
- More expensive per gallon than galvanized
- Can crack in extreme cold if water freezes solid
- Harder to repair — plastic welding requires the right tools
- Some cattle will chew on the rim out of boredom
When to choose poly: Rocky or saline soils that corrode metal. Hobby farms where appearance matters. Operations that move tanks between pastures.
Concrete stock tanks
Heavy-duty, permanent installations. You pour it in place or buy precast.
Pros:
- Effectively permanent — 30+ year service life is normal
- Resistant to damage from livestock
- Holds temperature better than steel or poly (slower to freeze)
- Can be designed for very large capacity (1,000+ gallons)
Cons:
- Most expensive option upfront
- Cannot be moved — ever
- Cracking risk in extreme freeze-thaw cycles
- Heavy installation (precast units need equipment)
When to choose concrete: Permanent perimeter installations where you'll never move the tank. Operations with large herds that need 500+ gallon capacity per location.
Rubber stock tanks
The newest option — heavy recycled rubber, flexible, indestructible.
Pros:
- Nearly impossible to damage — a bull can hit it without consequence
- Won't crack in freeze cycles
- UV-stable, won't degrade in sun
- Insulating properties similar to poly
Cons:
- Most expensive option per gallon
- Available in fewer sizes
- Some animals are wary of the smell initially
When to choose rubber: High-impact environments — sale barns, working chutes, rough corral installations.
How to size a stock tank
Rough rule of thumb for cattle: each cow consumes 10–20 gallons per day depending on temperature. For a small herd in a temperate climate, plan capacity at:
- 1–3 cattle: 50–100 gallon
- 4–8 cattle: 100–300 gallon
- 10+ cattle: 300+ gallon, or multiple tanks
For horses, plan 10–15 gallons per horse per day in heat. For sheep or goats, 2–3 gallons per animal per day.
If you have a refill source (well, hauled water, automatic float valve), size your tank to last 24–48 hours between fills, not all week. Smaller tanks refilled more often stay cleaner.
The cost of ownership calculation
Don't just compare purchase price. Add in:
- Tank heater cost (~$55) and electricity (~$3–5/month in cold months)
- Cleaning frequency — galvanized and concrete are easier to clean than poly
- Replacement frequency — galvanized at 18 years, poly at 12 years, concrete at 30+ years
- Repair cost when something goes wrong — galvanized is most repairable
Over a 15-year ownership cycle on a 100-gallon tank:
- Galvanized: ~$175 + $50 in heaters/maintenance = $225 total
- Poly: ~$220 + $50 in heaters = $270 total (but may need replacement in year 12)
- Concrete: ~$400 installed, no replacement needed = $400 total but lasts 2x longer
Per year of service: galvanized wins at the small-tank end, concrete wins at the large permanent-install end.
What we'd buy
For most operations, our default recommendation is a galvanized 100-gallon tank with a 1500W heater. It's the workhorse setup that costs the least to own over 15 years, is easy to maintain, and works for everything from small hobby herds to working operations with 20+ head per water point.
If you've got specific questions about your setup — unusual herd size, freeze concerns, or limited access to electricity for heaters — email us. We've spec'd a lot of these.