Why your water smells like a pool some weeks

It's usually your utility doing routine maintenance. Here's what's happening and what helps.

That pool smell is chlorine, and for a few weeks a year it's normal. Many utilities here switch disinfectants each spring and flush their lines to keep the pipes clean. For a few weeks, usually spring into early summer, tap water can smell and taste like a swimming pool. Then it goes back.

That pool smell is the disinfectant itself. Chlorine keeps bacteria out of the miles of pipe between the plant and your house. What's left over is what you smell at the tap.

What helps right away

Fill a pitcher and refrigerate it, loosely covered. Much of the chlorine taste and smell fades on its own within a few hours.
Any fresh carbon filter, pitcher, fridge, or faucet-mounted, handles chlorine taste well. If yours isn't, the cartridge is probably overdue: the 2-month rule.

The one smell that means something else

Two smells, two different stories. Only one of them is the utility's doing.

Rotten egg ≠ pool. A sulfur, rotten-egg smell, especially in hot water only, usually points at the water heater (often its anode rod), not the utility. It's a house problem, not a city problem: the two-tap test, and the fix.

The part worth watching in your report

Chlorine itself is doing a job. It's what keeps bacteria out of the lines between the plant and your home. The trade-off is what it leaves behind: disinfection byproducts (the TTHM line in your report, alongside haloacetic acids), one of the most common flags in our area. The pool smell fades on its own; the byproducts are the line worth two minutes of your attention: how to read your report. Want to see where your utility stands on those byproducts? Every local system's page shows its exact numbers, Arlington, Fairfax, DC Water, and 55 more.

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See where your utility stands on byproducts

The smell fades. The byproducts are the line worth reading. Type your ZIP and see your utility's published TTHM and haloacetic acid numbers against both the legal limit and the health guideline.

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Go deeper: the spring chlorine switch, with this year's dates · TTHMs explained · haloacetic acids · how to test your water