Fix Bad-Tasting RV Water

New polyethylene tanks and hoses off-gas trace compounds that impart a plastic taste, especially when water sits in a hot RV or flows through sun-warmed hoses. Standard garden hoses are the worst offenders — they're not food-grade and actively leach phthalates and BPA into water. Hot weather accelerates the process.

Step 1: Replace any non-NSF-61 hoses immediately. This is the single most common cause of plastic taste.

Step 2: Flush the tank and all lines. Fill completely, run all faucets until the tank empties, repeat twice.

Step 3: Install a carbon block filter at the drinking faucet. Activated carbon absorbs off-gassing compounds and clears taste within a day or two of use.

Long-term: New tanks typically stop off-gassing after 4–8 weeks of use and regular flushing. The taste will diminish on its own — but don't drink it in the meantime.

If all water smells: Sulfur-reducing bacteria growing in a stagnant or contaminated fresh water tank. This is a contamination issue — the water is not safe to drink until the tank is sanitized.

If only hot water smells: The magnesium anode rod in your water heater is reacting with sulfur compounds in the water supply, producing hydrogen sulfide gas. This is harmless but unpleasant.

All water smells → sanitize the tank immediately. Use the bleach flush method: ¼ cup unscented bleach per 15 gallons of tank capacity. Fill completely, run to all faucets until you smell bleach, sit 4–12 hours, drain, refill with clean water, flush until bleach smell is gone. See the full sanitizing guide.

Hot water only → anode rod issue. Replace the standard magnesium anode with an aluminum/zinc anode — they don't produce hydrogen sulfide. Or remove the anode entirely if you're on a treated city water supply (not recommended for well water use, as the anode protects the tank).

Municipal campground water supplies can be heavily chlorinated — legal and safe, but unpleasant. Rural areas with hard water or high mineral content add to the taste problem. This is a supply issue, not a tank issue.

Install a carbon block or KDF-55 inline filter at the city water inlet or between your hose and the fresh water fill port. Carbon filters remove chlorine taste very effectively — most people notice an immediate improvement. Replace the filter cartridge every 3–6 months depending on water quality and usage.

Carbon Filter on Amazon →

Biofilm — a thin layer of bacteria — growing on the inner walls of the tank and water lines. Happens when the tank sits partially filled and unused, especially in warm temperatures. Biofilm is the most common reason RVers need to sanitize mid-season rather than just annually.

Sanitize the tank using the bleach method. After sanitizing, flush lines thoroughly by running all faucets until the tank empties. To prevent recurrence: don't store more water than you'll use within 2 weeks; add a water stabilizer (Camco TastePURE) for longer storage; and sanitize at the start and end of every camping season.