Recreational vehicles, or RVs and campers, have a clean water system and a wastewater system. The clean water is also known as potable water or fresh water; the wastewater is known as black water or gray water. RVs will have separate tanks for both freshwater, black water and grey water.
When a standard tank doesn’t fit your layout, Miller Plastic Products can fabricate RV water tanks to meet your space, capacity, and connection needs. Our team works with customer drawings, measurements, or tank builder details to create a tank that fits the application without forcing a generic solution into a limited compartment.
This level of customization can help when an RV has limited clearance or specific inlet and outlet locations. A properly fitted tank can also make installation easier and support better performance across the water system. Each tank starts with high-quality plastic and precise cutting, which helps create clean edges, dependable welds, and a finished product built for long-term use.
For freshwater or wastewater systems, RV water tanks need the right shape and construction to support secure placement and reliable storage. Miller Plastics also creates custom water storage tanks for applications requiring specific dimensions, fittings, or placement.
Our welds are second to none, being very smooth and easily cleaned. Nothing leaves our shop with a saw cut edge or a sharp edge. Every piece of our RV water tanks is individually cut out on high-tech CNC routers. Scroll below to get a quote on a custom plastic RV water tank today.
These custom fabricated tanks start at $1,491.
We offer a wide selection of tanks in any size or shape to fit your need. Our tanks can also be heated for use in freezing weather. The kinds of tanks we can fabricate to your exact specifications include:
Fresh Water Tanks
Wastewater Tanks
Grey Water Tanks

Plastic RV Tanks: A Cost-Effective Alternative to Steel
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We offer free design assistance and can provide 2D or 3D drawings using AutoCAD and SOLIDWORKS
