RV water tastes like plastic? Here's how to fix it.

New rigs and rigs that sat all winter both produce funky-tasting water. Here's the cleanout that actually works.

If your RV water tastes like plastic, mildew, swimming pool, or anything else that doesn't taste like water, the problem is almost always biofilm in the lines and tank, residue from manufacturing, or both. This guide walks through the standard sanitize-and-flush procedure that fixes the taste in almost every case, and covers what to do if it doesn't.

1. Empty the fresh water tank

Open the low point drain (under the rig, usually two valves) and let the tank empty completely. Open every faucet to vent and drain the lines. Drain the water heater tank too: turn it off, let it cool, open the drain plug, then open the pressure relief lever.

2. Mix a bleach solution

Use 1/4 cup of unscented household bleach for every 15 gallons of fresh tank capacity. Mix the bleach into a gallon of water first, never pour straight bleach into the tank, it can damage seals if it concentrates in one spot.

Pour the bleach mixture into the fresh water fill. Fill the tank the rest of the way with potable water.

3. Run bleach water through every line

Turn the pump on. Open every faucet (hot and cold), the shower, the outside shower, the toilet flush, and the ice maker line if you have one. Run each until you smell bleach. This puts the sanitizing solution into every part of the system.

4. Let it sit

Turn off the pump and close all faucets. Let the bleach solution sit in the system for at least 4 hours, ideally overnight. The bleach kills biofilm, bacteria, and the funky-taste compounds.

5. Drain and flush twice

Open the low point drain and empty the tank. Refill with fresh water and run every faucet again until you can't smell or taste bleach. This usually takes 2-3 full tank flushes. Be patient, residual bleach taste lingers in the lines.

6. If the taste comes back fast

Persistent funky water after sanitizing usually means biofilm in the fresh tank itself. You may need to scrub the tank with a bottle brush through the inspection port (if your rig has one) or use a tank cleaning enzyme like Camco TastePURE. As a last resort, install an inline carbon filter at the city water inlet, it polishes the taste of any incoming water and is the easy upgrade.

Frequently asked questions

How often should I sanitize my RV fresh water tank?

At least once a year, or any time the rig has been stored more than a month. Many full-timers do it every 6 months. After a long storage, it's not optional.

Can I use vinegar instead of bleach to sanitize?

Vinegar removes mineral scale and some odors but does not kill bacteria the way bleach does. For real sanitizing, use bleach. Vinegar is fine as a follow-up rinse if you want.

Why does my new RV water taste like plastic?

Brand-new tanks and lines off-gas plasticizers for the first few months of use. The fix is the standard sanitize-and-flush, plus filling and draining the tank a few times during the first month. The taste fades.

Should I drink water from my RV fresh tank?

Yes, after a proper sanitize. Many RVers also add an inline carbon filter at the city water inlet plus a smaller filter under the galley for drinking water. Layered filtering is the standard setup.