Using an RV dump station takes about four moves: connect a sewer hose tightly at both ends, empty the black tank first, empty the gray tank second, then rinse the hose into the inlet and clean up. Black first matters because the gray water that follows helps flush the hose, as the City of San Diego’s RV dumping card puts it. The rest of this guide covers how to use an RV dump station in detail, what to bring, how to behave in line and where public rest areas still offer one.
What to bring before you pull in
Have everything within reach before you stop, so the station is free again quickly.
- Sewer hose of the correct size, with fittings that make an airtight connection at the tank outlet and at the inlet
- A separate rinse hose. San Diego’s guidance says to carry an extra hose and never rinse with your freshwater hose.
- Disposable gloves and safety glasses. The City of Carpinteria’s RV dumping guide recommends a spill kit with absorbent, gloves and safety glasses.
- Absorbent material for spills. San Diego County advises having it ready to apply and sweep up.
- A bag or bin for used gloves and wipes
How to use an RV dump station, step by step
- Position the RV so your tank outlet is on the same side as the dump inlet and the hose reaches without stretching.
- Put on gloves and safety glasses.
- Connect the hose to the RV outlet first, then insert the other end into the inlet. Carpinteria and San Diego County both say to secure both ends of the hose before you open a valve.
- Open the black tank valve. Watch the hose while it drains to make sure it stays connected.
- Close the black valve when the flow stops.
- Open the gray tank valve. The soapy gray water helps rinse the hose of solids. Close the valve when it is empty.
- Rinse the hose. Carpinteria’s guide says to disconnect the RV end while the other end is still in the inlet, then rinse the inside of the hose to remove residue.
- Rinse any spills toward the inlet. San Diego County says residue and spills should go toward the dump station inlet, which connects to the sewer or septic system. For spills off the pad, Carpinteria says to clean up using dry methods, which means absorbent, not a hose.
- Stow the hose, close the inlet cap if the station has one, and dispose of gloves.
- Wash your hands before you touch the steering wheel, door handles or food.
Keep valves shut whenever you are not dumping, a point both city guides make. Utah State University Extension adds a basic rule: never open tanks while driving or at a campsite. Black and gray water belong in a designated dump station only, never in a curb, gutter or the sand. San Diego notes that anything entering a storm drain flows untreated into the bay, and its fines for illegal dumping reach up to $1,000 per incident. That figure is San Diego’s; other cities set their own penalties.
Holding tank chemicals and septic dump stations
Not every dump station drains to a city sewer; San Diego County’s guidance describes the inlet as connected to the sewer or septic system. Harsh tank chemicals can damage those systems. An EPA Region 9 fact sheet explains that chemicals such as formaldehyde can kill the bacteria a septic system needs, and that this can lead to clogged drainfields or groundwater contamination. The same fact sheet warns that a site causing contamination may be forced to close its dump station.
The Washington State Department of Health’s best management practices for RV parks (2024) names formaldehyde, bronopol and benzene among the chemicals to avoid and encourages RV owners to use no chemicals in their holding tanks. If you use a deodorizer, EPA’s advice is to read the label, choose a biodegradable enzyme or citrus-based product and use no more than the recommended amount. Only human waste and toilet paper should go into the toilet.
Dump station etiquette
When other RVers are waiting behind you, a few habits keep the line moving and the pad clean. They are our editorial recommendations, not posted rules.
- Prepare before you pull up. Gloves on, hose out, rinse hose ready.
- Dump and go. Do your tank flushing and hose cleaning at the station, but save other chores, such as filling water or reorganizing storage, for later if people are waiting.
- Leave the pad cleaner than you found it. Rinse spills toward the inlet and close the lid.
- Respect the signs. If a water spigot is marked non-potable, use it only for rinsing, never for drinking or filling your fresh tank.
- Report problems. EPA’s fact sheet advises reporting sewage spills to the local health department. At a rest area, tell the state DOT, which runs the site.
What does a dump station cost?
Fees vary by operator and location, and we have no national price to quote. Some public dump stations are free and others charge. In Utah, for example, the state university extension service says most are free to use or charge a small fee. Check the sign at the station or the operator’s website before you rely on a free one.
RV dump stations at public rest areas
Our directory currently lists 71 public rest stops with an RV dump station recorded by a source, out of about 1,370 locations in 46 states. By state: Alabama 17, California 16, Washington 14, Colorado 4, Georgia 4, Wyoming 3, Texas 3, Kansas 2, Connecticut 2, Oklahoma 2, West Virginia 2, Delaware 1 and Nevada 1. A missing dump station on a listing means “unknown”, not “none”.
Two official sources shaped those numbers:
- Iowa: The Iowa DOT’s rest area page states that it no longer offers RV dump stations at Iowa rest areas. Older site data still showed 24 of them; we updated our Iowa listings in November 2026 to match the DOT.
- Washington: WSDOT’s rest area list shows several dump stations as closed, including Silver Lake (I-5 southbound), Winchester (I-90 both directions) and Sprague Lake (I-90 eastbound). We marked those four as unavailable. WSDOT also offers a filter for dump stations that close for the winter.
Examples of listings in our directory with a recorded dump station include Gee Creek Safety Rest Area on I-5 northbound in Washington, which WSDOT shows as open, and the I-5 rest areas at Willows northbound, Willows southbound and Tejon Pass southbound in California.
See the full list in our RV dump stations directory, or search your route with the rest area finder. Because dump stations can close for maintenance, for the winter or for good, check the state DOT page or the listing’s status before you count on one. Our data sources page explains where each state’s amenity data comes from.
If you plan to spend the night near a dump station, the stay limits in can you sleep at a rest area? and the options in free overnight parking apply.
Frequently asked questions
Can I empty my gray tank on the ground?
Not as a general practice. Utah State University Extension says to always empty both black and gray tanks at a designated RV dump station, and San Diego says never to dump into the curb, gutter or sand. Local rules on gray water vary, so a designated dump station is the safe choice.
What should I do if I spill?
Contain it with absorbent and clean it up dry, as Carpinteria’s guide advises, and rinse only small amounts of residue on the pad toward the inlet. If sewage reaches the ground or a storm drain, report it to the local health department or, at a rest area, to the state DOT.
Sources
- RV dumping card, City of San Diego, Think Blue
- Gotta Go! RV camping, Utah State University Extension
- RV wastewater fact sheet (EPA 909-F-99-002), US Environmental Protection Agency, Region 9
- Best management practices for RV parks and campgrounds (DOH 337-135), Washington State Department of Health
- Rest areas, Iowa Department of Transportation