The Complete Caravanners’ Guide To Carrying Water

Water is life on the road. Get it wrong and you’ll find yourself rationing showers, hunting for taps, or worse — running dry in remote areas where the next water source is hundreds of kilometres away.

Most new caravanners underestimate their water needs. A family of four can easily use 150-200 litres per day when living full-time in their van. That’s drinking, cooking, washing dishes, showering, and the inevitable spillages that come with caravan life.

The challenge isn’t just carrying enough water — it’s balancing capacity with weight limits, understanding different tank materials, and choosing the right pumps and monitoring systems. Make the wrong choices and you’ll either be constantly water-stressed or overweight at every weigh bridge.

How Much Water Do You Actually Need?

Before choosing tanks and pumps, you need to understand your actual consumption. The standard caravan fresh water tank is 100-120 litres, which sounds like plenty until you start living in it full-time.

Here’s what real caravanners use per day:

• Solo traveller: 40-60 litres/day
• Couple: 80-120 litres/day
• Family of four: 150-200 litres/day
• Large families: 200+ litres/day

These figures include everything: drinking (4 litres per person), cooking (10-15 litres), dishwashing (15-20 litres), personal hygiene (20-40 litres per person), and cleaning (10-20 litres). If you’re free camping for extended periods, budget for the higher end of these ranges.

The key question isn’t just daily usage — it’s how many days you want between fill-ups. If you’re touring and can refill every 2-3 days, a smaller system works fine. For serious free camping or remote travel, you need 4-7 days of storage minimum.

Fresh Water Tank Materials: Poly vs Steel vs Fibreglass

Your tank material affects taste, durability, weight, and cost. Each has clear advantages depending on your travel style.

Polyethylene (Poly) Tanks

The most common choice for good reason. Food-grade polyethylene tanks are lightweight, won’t rust, and handle road vibrations well. Quality varies enormously — cheap tanks crack, while premium ones like Aussie Tanks ~$300-600 last decades.

Pros: Lightweight, corrosion-proof, affordable, easy to repair
Cons: Can develop taste over time, UV sensitive, cheaper ones crack

Stainless Steel Tanks

The premium option. Marine-grade 316 stainless steel tanks like those from Tank World ~$800-1,500 deliver the best water taste and maximum durability. They’re heavy but practically indestructible.

Pros: Excellent taste, extremely durable, hygienic
Cons: Expensive, heavy, requires professional installation

Fibreglass Tanks

Less common but worth considering for custom applications. Often integrated into the caravan’s structure, they maximise space efficiency. Quality depends heavily on the manufacturer’s layup process.

Pros: Lightweight, can be custom shaped, good insulation
Cons: Expensive to repair, potential for gelcoat cracking, fewer supplier options

Tank Sizing and Weight Considerations

This is where many caravanners get it wrong. Water is heavy — 1 litre equals 1 kilogram. A 200-litre fresh water tank adds 200kg to your rig when full, plus the tank weight itself.

You need to balance three factors: your payload capacity, desired autonomy, and physical space. Here’s how to calculate what works:

1. Check your payload: Total allowable weight minus actual caravan weight
2. Subtract essentials: Personal items, food, clothes, equipment (typically 300-500kg)
3. Calculate water budget: Remaining payload divided by 1kg per litre

Most single-axle caravans max out at 120-150 litres total water (fresh + grey). Dual-axle rigs can handle 200-300 litres, but check your individual specs.

Multiple Tank Strategy

Many experienced caravanners run multiple smaller tanks instead of one large one. Benefits include better weight distribution, redundancy if one tank fails, and the option to carry different water qualities (town water in one, bore water in another).

A typical setup might be a 120L main tank plus a 60L auxiliary tank. You can fill both for maximum capacity or run on just the main tank for weight savings.

Water Pumps: 12V vs Pressure vs Manual

Your pump determines water pressure, flow rate, and how much 12V power you’ll consume. The wrong choice leads to weak showers, pump cycling, and flat batteries.

12V Diaphragm Pumps

The standard choice. Shurflo 4008 ~$180 and Jabsco Par-Max 3 ~$220 dominate the market. They’re self-priming, handle dry running, and deliver consistent pressure.

Look for pumps with accumulators (pressure tanks) to reduce cycling. A 2-litre accumulator tank costs $50-80 but transforms your water system by maintaining steady pressure and reducing pump runtime.

Pressure Pumps vs Variable Speed

Traditional pumps run at full speed regardless of demand. Variable speed pumps like the Shurflo Revolution ~$320 adjust speed to match flow requirements, using less power and running quieter.

Manual Backup Systems

Every water system needs a manual backup. A simple foot pump or hand pump ensures you can access water even with electrical failures. Whale Gusher Titan ~$85 manual pumps are bombproof and take minutes to install.

Water Level Monitoring Systems

Guessing your water level is a recipe for running dry at the worst possible moment. Accurate monitoring transforms how you manage water on long trips.

Traditional Tank Gauges

Most caravans come with basic 12V gauges that show empty, half, or full. They’re inaccurate and fail regularly. Aftermarket digital gauges like SeeLevel II ~$280 use external sensors and provide accurate readings in 10% increments.

Smartphone-Connected Systems

Modern systems like PrecisionTemp RV ~$450 connect to your phone via Bluetooth, showing real-time levels, usage trends, and low-level alerts. They’re expensive but invaluable for serious remote travel.

DIY Monitoring Options

For basic monitoring, a clear sight tube or external gauge works well. Sight tubes cost $20-30 and show exact levels, but they’re fragile and can freeze. External float gauges are more robust but less precise.

Water Filtration and Treatment Options

Australian water quality varies dramatically. Town water in Perth tastes like chlorine, bore water in the Pilbara is full of minerals, and some remote sources are barely potable. Your filtration needs depend on your destinations and standards.

Basic Inline Filters

Most caravanners start with simple inline carbon filters like Camco TastePure ~$35. They improve taste and remove chlorine but won’t handle sediment or bacteria. Replace every 3-6 months or when taste degrades.

Multi-Stage Filtration

Serious water treatment requires multiple stages: sediment pre-filter, carbon block, and optionally UV sterilisation or reverse osmosis. Puretec Traveller ~$280 systems handle most Australian water sources effectively.

Water Treatment Chemicals

For tank sanitisation and long-term storage, chlorine bleach (unscented) at 1ml per 10 litres keeps water fresh. Aquatainer tablets are more convenient but expensive. Always flush thoroughly before drinking treated water.

Grey Water Tanks: What You Need to Know

Grey water (from sinks and showers) needs somewhere to go. Many caravanners focus on fresh water capacity but forget grey water storage, leading to messy overflows and environmental damage.

Grey Water Capacity Rules

Your grey water tank should hold at least 60-70% of your fresh water capacity. If you have 150 litres fresh, you need 90-100 litres grey storage minimum. This accounts for water lost to drinking and evaporation.

Grey Water Tank Types

Portable grey water tanks offer flexibility — empty them where appropriate rather than storing days of waste water. Thetford Porta Potti ~$120 portable units work well for couples but families need larger fixed tanks.

Legal Requirements

Many national parks and some states require grey water tanks. Even “biodegradable” soaps damage fragile ecosystems. Check regulations for your destinations and carry grey water capacity accordingly.

Maintenance and Sanitisation

Water systems need regular maintenance to stay safe and functional. Neglect them and you’ll face pump failures, contaminated water, and expensive repairs.

Monthly Tasks

• Check pump operation and pressure
• Inspect all fittings for leaks
• Clean tank vents and overflow outlets
• Test monitoring system accuracy
• Replace inline filters if taste changes

Quarterly Deep Cleaning

Sanitise tanks every 3-4 months or after questionable water sources. Use unscented chlorine bleach at 1:100 ratio, fill completely, let sit overnight, then flush thoroughly until chlorine smell disappears.

Annual System Service

Have your pump serviced annually — diaphragms wear out and valves stick. Replace pressure switches, check accumulator pressure, and inspect all plumbing connections. Budget $150-250 for professional service.

Our Top Water System Recommendations

After analysing hundreds of installations and talking to experienced caravanners, here are our top picks for different scenarios:

Budget Tourist Setup ($450-650)

Perfect for caravan park touring with occasional free camping. Basic but reliable components that handle most Australian touring conditions.

Balanced Free-Camping Setup ($800-1,200)

The sweet spot for most caravanners. Handles 3-4 days free camping comfortably with better monitoring and filtration.

Serious Remote Setup ($1,500-2,500)

For the Canning Stock Route, Cape York, or extended Outback travel. Maximum capacity with redundant systems and premium components.