
Not every water project starts with a steel or concrete tank. Farms, water districts, and industrial sites also store and protect water in reservoirs, irrigation ponds, process basins, and secondary containment areas. The lining (and sometimes a floating cover) has to match that job.
At Carson Liners, we fabricate custom liners and covers for tanks, ponds, and containment systems. This guide focuses on the work that sits outside a simple drop-in tank liner: floating liners, irrigation pond liners, secondary containment liners, and when a plastic tank liner inside concrete or steel makes more sense than a recoat.
What a floating liner does
A floating liner, often called a floating cover, sits on the water surface. It can cut evaporation, limit algae growth, keep debris and wildlife out, and help protect water quality in reservoirs and covered storage.
Because the cover stays out in the sun and weather year-round, the material has to hold up. Carson often points to UV-rated options such as CSPE (HypaFlex) and reinforced polypropylene (RPP) for long-term outdoor exposure. You can compare grades and thicknesses on our specifications and geomembrane pages, and see how we match materials to jobs on material selection.
If the water is meant for drinking, ask whether the floating cover and any related water tank lining products are listed for potable service. Start with our guide to NSF/ANSI 61 certification for tank liners and confirm the current listing in NSF’s certified drinking water components database.
Choosing an irrigation pond liner
An irrigation pond liner has a different job than a decorative backyard pond. Water levels rise and fall with the season. More of the liner sees sunlight when levels drop. The subgrade, slopes, and anchor trench all affect how long the install lasts.
Before you buy, plan for:
- Site preparation. Smooth subgrade, no sharp rock, and a clear plan for the anchor trench around the perimeter.
- Exposure. How much of the liner will stay in the sun when the pond is drawn down.
- Thickness and reinforcement. RPE and RPP grades vary by mil thickness and expected service life. See our specifications.
- Access and fittings. Inlet and outlet pipes, overflows, and any paths you’ll need for maintenance later.
For broader pond options, see our pond liners page. Agricultural and wastewater basins are covered in our lagoon liners for wastewater and agriculture guide. Related reading on our site includes protecting groundwater in California and water preservation.
For conservation-minded projects, the USDA NRCS publishes practice guidance on pond sealing or lining with a geomembrane (Practice Standard 521). Use that as design context, then match the liner to your site with a fabricator who works from your measurements.
Ready for a quote? Use our pond quote form.
Secondary containment liners for tanks and process areas
Secondary containment liners are there for what should not reach the ground: spills, leaks, washdown, or overflow from primary tanks and process equipment. You’ll see them around plating, chemical storage, fuel, and other industrial areas where inspectors and insurers care about both capacity and chemical compatibility.
A useful conversation with a fabricator usually covers:
- What liquids could reach the liner (names, concentrations, temperatures)
- Whether the containment is covered or open to weather
- Required capacity relative to the largest tank or combined volume
- Penetrations, sumps, and how the liner attaches to walls or curbs
Carson fabricates plating and containment liners to project dimensions. For oil-related facilities in the U.S., EPA’s SPCC guidance for regional inspectors is a practical reference for how secondary containment is evaluated. Your local requirements still govern.
Request a quote through our plating and containment liner quote form.
Plastic tank liners inside concrete and steel structures
A plastic tank liner is often the practical fix when a concrete water tank or steel tank still has structure left, but the interior surface is cracked, corroded, or hard to keep sealed. Instead of recoating or rebuilding, a custom drop-in liner creates a new water-contact surface sized to the tank.
That approach shows up often for:
- Concrete water tank liners. Municipal and agricultural concrete tanks with leaks or surface wear.
- Steel and redwood tanks. Where a fabricated liner protects water quality and extends tank life.
- Galvanized stock tanks. Smaller vessels that benefit from a fitted barrier between water and metal.
Explore water tank liners, custom water tank liners, drop-in liners, and stock tank liners. For rectangular tanks, use the rectangular water tank quote form.
Potable water: what to verify before you buy
For a potable water tank liner or a floating cover over drinking water, don’t stop at marketing language. Confirm that the specific product is currently listed for the intended drinking-water use.
NSF/ANSI 61 addresses health effects from substances that materials may contribute to drinking water. It does not, by itself, prove service life or installation quality. Check the live listing in the NSF certified drinking water components database, and tell us whether the application is potable so we can recommend an appropriate grade.
For general background on U.S. drinking-water protection, see the EPA’s ground water and drinking water pages.
A short checklist before you order
- What are you containing? Water, wastewater, chemicals, or stormwater. Include temperature and cleaning chemicals.
- Is it a tank, pond, floating cover, or secondary containment area? Shape and access change how we fabricate.
- Will the liner or cover stay in the sun? Include drawdown and empty periods.
- Is the water potable? Confirm NSF/ANSI 61 listing for the exact product.
- How will seams and fittings be handled? Factory fabrication versus field seams, drains, and penetrations.
You don’t need the material name picked out before you call. Send measurements, contents, and exposure conditions, and we’ll help match the liner to the project.
Call 800-423-2380 or email sales@carsonliners.com.



