RV Grey Water Tanks for Sinks, Showers & Non-Potable Wastewater Not all waste tanks are built for toilet waste — and not all plumbing needs one that is. Grey water tanks handle the water from your sinks, showers, and appliances — the stuff that’s dirty, but not disgusting. Whether you’re outfitting a camper, building a skoolie, upgrading your food truck’s tanking system, or replacing a cracked tank under your RV kitchen, these tanks are purpose-built to store non-potable wastewater safely, cleanly, and within code....
At Tank Depot, we stock a wide selection of polyethylene RV grey water tanks ranging from 3 gallons to 150 gallons, with options for pre-installed fittings, custom configurations, or blank tanks you can tailor to your build. They're tough enough for the road, compatible with standard grey water setups, and designed to stay leak-free, odor-free, and out of the way. While many of these tanks are also suitable for use as RV black water holding tanks or even RV freshwater tanks, this collection is curated to provide the perfect solution for your RV grey water tank needs. Because when your RV waste tank works right, you don’t have to think about it at all.
Applications for RV Grey Water Tanks
RV Kitchen Sink Drainage
Captures used water from RV kitchen sinks to keep grey water separated from sewage systems and prevent contamination.
RV Shower Water Collection
Stores non-potable water from onboard showers in travel trailers, fifth wheels, and motorhomes for proper offload at dump stations.
Camper Van Grey Tank Installations
Slim-profile grey water tanks fit under van conversions to manage sink runoff while meeting local codes and stealth-living requirements.
Food Truck Wastewater Storage
Essential for mobile kitchens; our RV grey wastewater tanks store grey water from handwashing, dishwashing, and prep sinks to comply with health regulations.
Concession Trailer Utility Drainage
Used in fair booths, coffee trailers, and mobile concessions to manage grey water from beverage stations or utility sinks.
Off-Grid Cabin & Tiny Home Setups
Perfect for grey water drainage in small footprint homes using RV plumbing systems — stores wastewater for controlled disposal.
Mobile Dog Grooming Van Waste Tanks
Collects shampoo and rinse water in grooming rigs; ideal for pet service professionals who need sanitary grey water containment on the go.
Outdoor Shower or Rinse Station Tanks
Captures soapy water from external rinse setups in RVs or vans — especially useful for sandy beach days or muddy trail rinses.
Marine Applications
Saltwater-ready and corrosion-proof, these tanks meet Coast Guard standards for use in boat showers, galleys, and utility sinks.
Why Choose Tank Depot’s RV Grey Water Holding Tanks
When it comes to handling grey water on the road, shortcuts just don’t cut it. Whether you're building out a van conversion, replacing a worn tank on your travel trailer, or outfitting a commercial food truck, you need more than a generic plastic box. You need a system that fits, lasts, and works every single time. That’s where Tank Depot delivers. Here’s what sets our grey water holding tanks apart:
Seamless One-Piece Construction
Our grey tanks for Rvs are rotationally molded into a single, solid unit — no glued seams, no joints, and no weak points. This uniform wall thickness translates to greater durability and virtually eliminates the risk of leaks, cracks, or structural failure on rough roads.
Built from Premium, Road-Ready Materials
Every RV waste tank is crafted from virgin polyethylene — a food-grade, corrosion-resistant plastic that stands up to daily use, temperature swings, and road vibration. It won’t break down from exposure to soap, grease, or waste.
Designed for Total Installation Flexibility
Your plumbing setup isn’t cookie-cutter, and your tank shouldn’t be either. Choose from grey wastewater tanks with standard threaded NPT fittings or go with a blank tank and place the fittings exactly where your space demands. For more involved builds, we offer custom fittings and accessories based on your layout.
Certified and Code-Compliant
Our RV grey water tanks comply with FDA regulation CFR 177.1520. Some, such as our Trionic tanks meet U.S. Coast Guard standards, making them suitable for a wide range of mobile water systems — from RVs and boats to concession trailers.
Sized for Every Project — Big or Small
From compact 3-gallon tanks for stealth vans and campers to 150-gallon grey water tanks for luxury RVs, we carry one of the most diverse selections on the market. Whether you’re working with a tight undercarriage or a spacious utility bay, there’s a tank here that fits.
Backed by Real-World Support
Need help choosing the right tank or fittings? Our product experts know the difference between black, grey, and potable systems — and we’ll help you spec the right tank for your setup the very first time.
Built for the Road. Trusted by Builders. Ready for Whatever You Throw at It.
Mobile grey water management doesn’t have to be complicated. With Tank Depot, you’re not just buying a grey waste tank for RVs — you’re investing in a long-term solution backed by rugged construction, flexible installation options, and expert support that understands mobile systems inside and out.
Whether you’re deep in a van conversion build, replacing a cracked camper tank, or outfitting a food truck to meet code, we carry the best RV tanks for greywater storage — and we’ll help you get it right the first time. Browse our full collection of RV grey wastewater tanks today and build your system with confidence.
