RV Fresh Water Fill: Safety and Etiquette

Filling your fresh water tank looks simple: find a spigot, connect a hose, wait. The risk is filling from the wrong tap or with the wrong hose. Dump stations have a water outlet for rinsing that isn't meant for drinking, and it often sits a few feet from where people empty sewage.

Dumpmapper's RV dump & water layer lists 525 separate fresh water fill points, and 588 dump stations whose listing says potable water is available. Here's how to use them safely.

The rinse hose is not drinking water

State rules for dump stations treat the rinse water as non-potable. Indiana's rules for campground dump stations require a sign at the water outlet saying it is "UNSAFE FOR DRINKING", and require the dump station and its water outlet to be at least 50 feet from any potable water outlet. Wisconsin's plumbing code also requires the wash-down supply to be labeled as not for drinking and located at least 50 feet from a potable supply unless a variance is approved.

The City of Bremerton's free dump station puts it plainly: its non-potable water is for rinsing messes only and must not be used to fill potable water tanks. If you can't tell whether a tap is potable, don't use it for your fresh tank.

Where to fill instead

The CDC's RV water guidance says to confirm with the campground or RV park manager that the water is safe to drink before you hook up, and, when you're dry camping, to fill from a safe drinking water source such as a treated home tap. Well water isn't always treated.

On Dumpmapper, separate water fill points show as blue drop pins. On a dump station's listing page, Listed services says whether a source reports potable water there. Treat that as a lead, not a guarantee: look for a sign marking the tap as potable.

Use a dedicated drinking water hose

• Keep one hose for fresh water only and never use it for rinsing sewer hoses or the dump pad.
• Store the fresh water hose separately from the sewer hose, with the ends capped or joined, and keep the ends off the ground while filling.
• Wash your hands after handling sewer gear and before touching the fresh water hose.

The Michigan Association of RV & Campgrounds gives the same advice and suggests storing the drained hose in a bag.

Keep the tank clean

The CDC notes that most RV makers recommend draining, disinfecting and flushing the water system at least once a year, or after the RV has sat unused for a few months. Follow your RV maker's instructions for the method. The Michigan Association of RV & Campgrounds suggests a quarter cup of bleach for every 15 gallons of tank capacity, left overnight, then draining and rinsing until the chlorine smell is gone. If you use a filter, check its label: many filters that improve taste don't remove germs.

Common questions

Can I fill my fresh water tank at a dump station?

Only from a tap marked as potable, using your own drinking-water hose. The rinse hose at a dump station is non-potable.

How often should I sanitize my RV fresh water tank?

The CDC says most RV makers recommend draining, disinfecting and flushing at least once a year or after a few months in storage. Follow your RV's manual.

Is campground water safe to drink?

Ask the campground manager before hooking up, as the CDC recommends. Most public systems are treated, but private wells may not be.

How do I find fresh water fill points on Dumpmapper?

Turn on the RV dump & water layer. Blue drop pins are water fill points; dump stations with potable water say so on their listing.

Etiquette at a shared fill point

• Fill and move on. If there's a line, park away from the spigot to finish other chores.
• Don't wash your rig at a fill point unless a sign allows it.
• Leave the area dry and clean, and report a broken tap to the operator.
• If the fill point is at a dump station, use the potable tap for your fresh tank and the rinse hose only for rinsing.

Sources: CDC: Safe RV Water from Tank to Tap; Indiana Department of Health: sanitary dumping stations; Wisconsin Admin. Code SPS 382.37; City of Bremerton RV dump station; Michigan Association of RV & Campgrounds: RV water health. Checked October 20, 2026. Fees, hours and rules change, so confirm with the site before you go.