# What a RV water filter costs

> RV water filters run $30-$200 depending on type, with $40-$90 per season in cartridges. See canister, inline, and under-sink setups priced out.

Canonical: https://watertreatmentpro.com/rv-water-filter-cost/

Last updated: 2026-11-09

An RV water filter costs $30-$200 depending on format: an inline hose filter is $20-$45, a two-stage exterior canister runs $60-$180, and an under-sink kit with its own faucet is $120-$200. Cartridges add $40-$90 per season. The filter is the cheap part; the hose, regulator, and fittings are where first-year spending creeps up.

## Three formats, three price points

An RV water filter is a point-of-use device that treats water between the campground spigot and the rig's plumbing. Three designs dominate, and they are not interchangeable in cost or capability.

Inline filters screw onto a hose and pass water through a carbon block in a disposable plastic body. At $20-$45 they are the cheapest entry and the least capable: small media volume, no sediment stage, and a short life at high flow.

Exterior canister units mount on a bracket or stand and hold a standard 10-inch cartridge, sometimes two in series. At $60-$180 they cost more up front but use commodity cartridges that cost $15-$40 each and are stocked everywhere.

Under-sink kits install inside the galley cabinet with a dedicated faucet. At $120-$200 they are the most expensive and the most convenient, because drinking water does not pass through the rig's tank and pump.

## What the first season actually costs

| Item | Cost | Life |
|---|---|---|
| Inline hose filter | $20 - $45 | 1 season |
| Two-stage canister | $60 - $180 | Housing reusable |
| Sediment cartridge | $12 - $25 | 2 - 4 months |
| Carbon cartridge | $18 - $40 | 3 - 6 months |
| Drinking water hose | $20 - $45 | 2 - 3 seasons |
| Pressure regulator | $12 - $30 | Several seasons |
| Under-sink kit | $120 - $200 | Housing reusable |

A first-season setup with a two-stage canister, one spare sediment cartridge, one carbon cartridge, a hose, and a regulator lands at $60 + $20 + $30 + $30 + $20 = $160, before the canister's second carbon cartridge. That is the realistic number, not the $29.99 on the shelf tag.

## The per-gallon arithmetic

Assume a household of two using 40 gallons per day in the rig and staying out 90 nights. That is 3,600 gallons per season. A two-stage canister with a $20 sediment and $30 carbon cartridge handles that for $50, or $0.014 per gallon.

An inline filter at $30 replaced twice in the same season costs $60 for the same volume, or $0.017 per gallon. The canister is cheaper per gallon after the first year and far cheaper over five seasons, because the housing is bought once.

Under-sink kits change the math. If you use 1.5 gallons per day for drinking and cooking across 90 days, that is 135 gallons. A $180 kit with a $40 annual cartridge is $1.33 per gallon in year one and $0.30 per gallon in later years. You are paying for taste and convenience at one tap, not for whole-rig treatment.

## Canister versus inline

The tradeoff is straightforward. Inline filters win on price, storage, and simplicity: no bracket, no housing to sanitize, no cartridge to stock. They lose on sediment capacity, because a small carbon block clogs fast when a campground runs off a well.

Canister units win on cost per gallon, on cartridge availability, and on the ability to run a sediment stage ahead of carbon. They lose on space and on winterizing, since a housing full of water will crack if it freezes.

A practical compromise many full-timers use: a coarse inline sediment filter at the spigot to catch sand, then a two-stage canister at the rig. The inline filter is $15-$25 and protects the more expensive cartridges downstream.

## Sizing to the rig, not the catalog

Gallons per day is the first number. A couple in a Class C uses 30-50 gallons per day; a family of four in a travel trailer with a shower habit can hit 80-100. Flow rate is the second: most RV fixtures want 1.5-3 GPM, and a filter that restricts below that makes showers unpleasant.

Pressure is the number people skip. Campground spigots commonly run 60-100 psi, and some exceed that. A $12-$30 regulator set to 45-55 psi protects the filter housing, the pump, and the rig's PEX. Without it, a $100 canister can split on the first hookup.

If the campground water is questionable, filtration is not treatment. [Bacteria in well water](https://watertreatmentpro.com/bacteria-in-well-water/) explains what a filter does and does not do with a microbiological problem, and [shock chlorinating a well](https://watertreatmentpro.com/shock-chlorinate-well/) covers the sanitizing side for private supplies.

## Five steps before you buy

1. Measure your daily water use for one trip, then multiply by your typical nights out.
2. Check the campground's water source; well-fed parks need a sediment stage.
3. Buy a drinking-water hose rated for potable use, not a garden hose.
4. Add a pressure regulator and set it to 45-55 psi.
5. Store one spare cartridge of each type so a clogged filter does not end a trip.

## Where the quote moves

Four things shift the number: whether the housing is stainless or plastic ($40-$90 difference), whether the kit includes a dedicated faucet, whether you need a heater-hose or freeze protection, and whether you are buying a name-brand cartridge or a commodity 10-inch one.

The last item matters more than the rest. A proprietary cartridge at $45 that is only sold by the manufacturer costs more over five seasons than a $120 canister that takes $18 commodity cartridges. Check cartridge availability before you buy the housing, not after.

For the home side of the same decision, [under sink water filter cost](https://watertreatmentpro.com/under-sink-water-filter-cost/) prices the kitchen equivalent, and [point of use versus point of entry](https://watertreatmentpro.com/point-of-use-vs-point-of-entry/) explains why an RV is always a point-of-use case.