RV dump stations: how they work and how to find one

What a dump station is

A dump station (sanitary station, sani-dump) is a 4-inch sewer inlet set in a concrete pad, usually with a hinged lid or a rubber donut, connected to a septic system or municipal sewer. Next to it is a non-potable water spigot for rinsing, and often a separate potable water fill some distance away. Most are drive-up pull-throughs near the campground entrance so you can dump on the way out without unhooking a toad or trailer.

You need one whenever your site does not have a sewer hookup: water-and-electric sites at state parks, nearly all national park campgrounds, and any time you are boondocking. Parks that offer one are listed under RV parks with a dump station.

Gear to keep in the wet bay

• Sewer hose kit, 15 to 20 feet: Camco RhinoFLEX, Thetford Titan, or Valterra Viper. Cheap thin-wall hoses split within a season.
• Clear 90-degree elbow with a 4-in-1 threaded adapter so it fits 3-inch, 3.5-inch, and 4-inch inlets. Clear so you can see when the flow runs clean.
• Disposable nitrile gloves, a box of 100.
• A dedicated rinse hose, ideally a different color from your fresh water hose, and never stored in the same bin.
• A sewer hose support (the plastic accordion kind) for full-hookup sites.
• Tank treatment: Happy Campers, Unique RV Digest-It, or a simple pod. Formaldehyde-based chemicals are banned at many parks with septic systems.
• Optional: a rubber donut or weighted ring to hold the elbow in an inlet that has no threads.

Step-by-step: black first, then gray

1. Pull up so the waste outlet is within hose reach and slightly uphill of the inlet if the pad allows. Set the parking brake. Put on gloves.
2. Check both gate valves are closed. Remove the cap on the RV outlet; a little liquid may drip, so keep a bucket or the elbow under it.
3. Connect the hose to the RV first with a quarter-turn on the bayonet lugs, then seat the elbow in the dump station inlet. If it will not thread, weigh it down or have a helper hold it. A hose that pops out of the inlet is the classic dump station disaster.
4. Pull the black valve. Let it run until the clear elbow shows the flow turning thin and mostly clear. A full black tank empties in 1 to 3 minutes. If your rig has a built-in tank flush, connect the non-potable hose to the flush port and run it for a few minutes with the valve still open. No flush port? A Camco Flexible Swivel Stik or a rinse wand through the toilet does the same job.
5. Close the black valve, then pull the gray valve. Gray water (sinks and shower) rinses the soap through the hose that just carried black. This order is the whole point.
6. Close the gray valve. Disconnect the hose at the RV end first, lift it toward the inlet so it drains, then rinse the inside of the hose with the non-potable spigot. Rinse the elbow and the pad if you splashed.
7. Cap the RV outlet, stow the hose in its bumper tube or bin, pull the gloves off inside out, and drop them in the trash can that is almost always right there.
8. Add a few gallons of water and treatment to the black tank before you drive off. A dry tank lets solids cement to the bottom.

Two things nobody tells first-timers: dump the black tank only when it is at least two-thirds full so the volume carries the solids out, and never leave the black valve open on a sewer hookup. Both habits prevent the dreaded pyramid plug.

Fees and where to dump when you are not a guest

Guests of a campground use the station for free. For non-guests, prices in 2026 look like this:

• Free: many rest areas in Oregon, Washington, Nevada, and Wyoming; some city parks and fairgrounds; Cabela's and some Bass Pro Shops; select Love's and Pilot Flying J truck stops.
• $5 to $15: most private RV parks, KOA campgrounds (typically $10 to $15), state parks, and RV dealers.
• $15 to $25: stations in tourist areas and near national parks, and some Flying J locations (around $10 to $15, free with certain loyalty cards).
• Free with purchase: Camping World stores, some RV service centers.

Finding one: the free Sanidumps directory and the RV Dumps app map thousands of stations; Campendium and iOverlander mark them with recent user reports and fees; Google Maps works if you search "RV dump station" and read the reviews for "closed for winter" notes. In the North, most outdoor stations shut down from roughly November to April because the water lines freeze, so year-round RV parks become the reliable option. Call ahead if the listing is more than a year old; stations close without notice.

Dump station etiquette

• Do everything else (filling fresh water, checking tires, walking the dog) somewhere else. The dump lane is for dumping.
• If a line forms, be quick and skip the ten-minute tank flush; do it at your next full-hookup site.
• Never fill your fresh tank from the non-potable rinse spigot, and never touch the potable spigot with a gloved hand or a sewer hose.
• Rinse the pad. The next person will thank you.
• Pay the fee even if nobody is watching. Stations that lose money get padlocked.
• Do not dump gray water on the ground at a campsite, even though some public lands technically allow it. Most do not, and it draws animals and fines.

How long tanks last

A 30-gallon black tank serves two adults for about a week; a 40-gallon gray tank fills in 3 to 4 days if you take RV showers. Big fifth wheels with 60- to 90-gallon tanks can go two weeks. Between dumps, a portable tote (Barker Tote-Along, Camco Rhino, 15 to 36 gallons) lets you wheel waste to the dump station without breaking camp. If that sounds like a chore, book a full-hookup RV park and skip the trip entirely; our full hookups guide explains how to set up sewer at the site.

Frequently asked questions