Summer 2026 many utilities switch to free chlorine Safe to drink chlorine and chloramine are EPA-approved NSF/ANSI 42 chlorine taste and odor reduction Activated carbon the textbook fix for chlorine taste 2 to 4 weeks typical temporary switch window Dialysis + fish need dedicated dechlorination steps CoreXchange filtration media Summer 2026 many utilities switch to free chlorine Safe to drink chlorine and chloramine are EPA-approved NSF/ANSI 42 chlorine taste and odor reduction Activated carbon the textbook fix for chlorine taste 2 to 4 weeks typical temporary switch window Dialysis + fish need dedicated dechlorination steps CoreXchange filtration media

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2026 summer water update

Tap water smells like a pool? Blame the summer chlorine switch.

Each summer many US utilities briefly switch from chloramine to free chlorine to clean out their pipes, so your tap can smell like a swimming pool for a few weeks. Here is why it happens, whether the water is safe, and how a carbon filter fixes the taste.

Safe to drink Chlorine and chloramine are both EPA-approved disinfectants

NSF/ANSI 42 Pure XP is certified for chlorine taste and odor reduction

2 to 4 weeks How long a typical temporary chlorine switch tends to last

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NSF/ANSI 42 certified Calm, source-cited guide Water stays safe to drink

The quick picture

If your tap suddenly smells like a swimming pool this summer, your utility probably switched to free chlorine for a few weeks.

Every year many water utilities temporarily change how they disinfect, usually switching from chloramine, a longer-lasting blend of chlorine and ammonia, to plain free chlorine for a few weeks. Systems often schedule this for spring or summer because warm temperatures make it easier for films and bacteria to build up inside miles of distribution pipes, and a short free-chlorine period helps clean the system out. It is routine maintenance, not an emergency. In 2026 you can see it on the calendar: Greenville Utilities in North Carolina ran its annual switch from June 16 through July 28, Tampa switched from May 29 to June 19, and several Texas cities including Cedar Park and Round Rock planned an August switch. The water stays safe to drink the whole time. What changes is the taste and smell, because free chlorine has a stronger, more pool-like odor than the chloramine you are used to.

Cl2 NH3

Year round chloramine keeps a stable residual

Summer switch utilities move to free chlorine

Your tap a stronger chlorine smell for weeks

It is scheduled maintenance, not a warning.

Utilities plan these switches in advance and post the dates. A stronger chlorine smell during a posted switch window is expected behavior, not a sign that anything is wrong with your water.

Free chlorine simply smells stronger.

Chloramine holds a milder odor across long pipe networks. Free chlorine is more volatile and pool-like, so it does the same disinfecting job but is far more noticeable at the tap.

Warm pipes are the reason for the timing.

Heat speeds biological growth inside distribution lines, so many systems schedule the free-chlorine period for spring or summer to keep the network clean when it matters most.

What is actually happening in the pipes

Chloramine most of the year, a short free-chlorine burn in summer. Both are safe. Mostly the taste changes.

Most large US utilities disinfect with chloramine because it stays stable across long pipe networks and forms fewer disinfection byproducts. The tradeoff is that chloramine can let a process called nitrification take hold inside the pipes, so systems periodically switch to free chlorine, a stronger and faster-acting disinfectant, to reset the distribution network. The practice is well established, especially in warm climates, and your water stays safe to drink and use. Two groups do need to take specific steps during a free-chlorine period, and utilities call them out every time: kidney dialysis centers must adjust how they treat water, and anyone with a fish tank, pond, or aquarium needs to dechlorinate as usual, because chlorine is harmful to fish. For everyone else the practical question is simply taste and odor, and that is exactly what an activated carbon filter is built to handle.

Epic water filter materials and certification visual

Both safe chlorine and chloramine are EPA-approved disinfectants The water stays safe to drink during the switch.

2 to 4 wks typical length of a temporary switch Utilities post the start and end dates in advance.

2 groups dialysis centers and fish owners must take action Both need to dechlorinate during the period.

NSF 42 the standard for chlorine taste and odor Pure XP is NSF certified to Standard 42.

The simple checklist

Three calm things to know when your water smells like a pool.

It is almost certainly a planned switch

Utilities post temporary disinfectant changes with start and end dates.
A stronger chlorine smell during that window is expected, not a red flag.
Check your utility's website or notifications to confirm the dates.

The water is safe, the taste is the issue

Free chlorine is an approved disinfectant, so the change is aesthetic for most people.
Chilling water in a covered pitcher in the fridge lets some chlorine off-gas.
Dialysis patients and fish owners still need their usual dechlorination steps.

Carbon filtering fixes the taste

Activated carbon is the textbook way to reduce chlorine taste and odor.
Pure XP is NSF certified to Standard 42 for chlorine taste and odor.
Replace the filter on schedule so it keeps working through the switch and after.

What a filter can honestly do

For chlorine taste and odor, activated carbon is the right tool, and this is the cert Epic actually holds.

This is one of the cleanest matches between a real problem and what a carbon filter is designed to do. Activated carbon reduces chlorine taste and odor by adsorption and by breaking free chlorine down as water passes through the media, which is why nearly every taste-and-odor filter on the market is carbon based. It is also the aesthetic effect covered by NSF/ANSI Standard 42, and Pure XP is NSF certified to Standard 42 along with NSF/ANSI/CAN 372 for lead-free materials. One honest nuance: free chlorine, the kind used during the summer switch, is actually easier for carbon to reduce than chloramine, which is more stubborn and needs more contact time. So if anything, a good carbon filter shines during the free-chlorine weeks. A filter improves taste and odor at your tap; it does not replace your utility's disinfection, and you should still follow any specific advisory your utility posts.

Adsorption and reaction The carbon fiber block grabs and breaks down free chlorine as water flows through, cutting the pool-like taste and smell.

Certified to Standard 42 Pure XP is NSF certified to Standard 42 for chlorine taste and odor, plus NSF/ANSI/CAN 372 for lead-free materials.

Honest boundary Chloramine is tougher than free chlorine and needs more contact time; replace the cartridge on schedule so the carbon keeps working.

Tap water in

Layer 1: Nano fiber media

Layer 2: Carbon fiber block core

Filtered water out

A look inside

The smell is temporary. Better-tasting water does not have to be.

Confirm the switch dates Skip the panic Filter at the tap Chill to off-gas Replace on schedule

Choose your setup

Better-tasting water, all summer and after.

Pure XP is NSF certified to Standard 42 for chlorine taste and odor. Use the direct buttons below to add the exact product to cart.

Recommended

Pure XP Pitcher

Broad everyday carbon filtration that reduces chlorine taste and odor.

Carbon fiber block reduces chlorine taste and odor
NSF certified to Standard 42 for taste and odor
Also NSF/ANSI/CAN 372 for lead-free materials

Buy Pure XP Pitcher

Best for families

Pure XP Dispenser

The same Pure XP carbon filtration with more ready-to-pour capacity.

Same NSF Standard 42 certified Pure XP media
Great for fridge or counter routines
Fits households that refill often

Buy Dispenser

Specialized pick

Nano XP Pitcher

For microbiological concerns and microplastics while maintaining fluoride.

NSF certified to Standard 42 + NSF/ANSI/CAN 372
Tested to reduce over 99.9% of microplastics
Maintains fluoride

Buy Nano XP

Best under sink

Smart Shield Max

Tap-first filtration for kitchens where you want the counter clear.

CoreXchange double-layer media
Up to 750 gallons per filter
Under-sink convenience

Buy Smart Shield Max

Fast decision guide

Pick by routine, not by overthinking.

The switch tells you what changed in the system. The product decision is a daily-use problem.

Pure XP

Choose this for chlorine taste and odor and everyday carbon filtration. Chlorine taste and odor, disinfection byproducts, and lead.

Nano XP

Choose this for microbiological plus microplastics concerns. Good when fluoride retention is part of the decision.

Dispenser

Choose this when everyone in the house keeps refilling. Same simple behavior, more ready water.

Max

Choose this when you want filtration at the sink. Best for a cleaner counter and tap-first flow.

Need Pure XP Nano XP Max

Chlorine taste and odor Strong Strong Strong

No install Yes Yes No

NSF certifications 42/372 42/372 N/A

Quick answers

PFAS FAQ, minus the wall of text.

Why does my tap water smell like a swimming pool?

The most common reason in summer is that your utility temporarily switched from chloramine to free chlorine to clean out its distribution pipes. Free chlorine has a stronger, more pool-like odor than the chloramine most systems use year round. These switches are planned, posted in advance, and usually last two to four weeks. The water stays safe to drink; what changes is mainly the taste and smell.

Is the water safe to drink during a chlorine switch?

Yes. Both chlorine and chloramine are EPA-approved drinking water disinfectants, and utilities run these temporary switches as routine maintenance, not because of contamination. The water stays safe to drink and use throughout. Two groups do need to take action: kidney dialysis centers must adjust their water treatment, and fish or aquarium owners need to dechlorinate as usual, because chlorine is harmful to fish.

Why do utilities switch to free chlorine in the summer?

Many systems disinfect with chloramine most of the year because it stays stable across long pipe networks. Over time that can allow a process called nitrification inside the pipes, so utilities periodically switch to free chlorine, a stronger disinfectant, to reset the system. Warm weather speeds biological growth in distribution lines, so the free-chlorine period is often scheduled for spring or summer.

How long does the chlorine switch last?

Most temporary switches run about two to four weeks, though the exact window varies by utility. In 2026, for example, Greenville Utilities in North Carolina scheduled its switch from June 16 through July 28, and Tampa ran one from May 29 to June 19. Your utility posts the start and end dates, so check its website or notifications to see when your area's period ends.

Does a water filter remove the chlorine taste and smell?

Yes. Activated carbon is the standard, well-proven way to reduce chlorine taste and odor, which is the aesthetic effect covered by NSF/ANSI Standard 42. Epic's Pure XP is NSF certified to Standard 42 for chlorine taste and odor, along with NSF/ANSI/CAN 372 for lead-free materials. Free chlorine, the type used during summer switches, is actually easier for carbon to reduce than chloramine, so a good carbon filter works well during these weeks.

Does boiling water get rid of the chlorine smell?

Boiling, or simply letting water sit in an open pitcher in the fridge, does help free chlorine off-gas, so the smell fades. But boiling is not necessary since the water is already safe, it uses energy, and it is less effective on chloramine, which does not evaporate as readily. An activated carbon filter is the simpler, more consistent fix for taste and odor at the tap.

What should dialysis patients and fish owners do?

These are the two groups utilities always warn during a free-chlorine switch. Kidney dialysis centers must adjust how they treat and monitor water, so anyone on home dialysis should follow their clinic's guidance. Fish, aquarium, and pond owners should dechlorinate water as they normally would, because chlorine and chloramine are both harmful to fish. A standard drinking water pitcher is not a substitute for these dedicated steps.

Ready to make it simple?

You cannot control the summer switch. You can fix the taste at your tap.

Pure XP for chlorine taste and odor and everyday carbon filtration, NSF certified to Standard 42. Nano XP for microbiological and microplastics priorities. Dispenser for more household capacity.

Buy Pure XP Pitcher Buy Nano XP Buy Dispenser

Temporary utility switches from chloramine to free chlorine are a routine, well-documented practice; 2026 examples and dates are drawn from utility notices including Greenville Utilities Commission (annual switch June 16 through July 28, 2026), the City of Tampa temporary change (May 29 through June 19, 2026), and coordinated Central Texas switches such as Cedar Park and neighboring cities (beginning August 3, 2026). The U.S. CDC and EPA describe both chlorine and chloramine as approved drinking water disinfectants and note that dialysis facilities and fish or aquarium owners must take specific steps during a switch; see the CDC and EPA chloramines pages. NSF/ANSI Standard 42 covers aesthetic effects including chlorine taste and odor. Product claims are based on Epic Water Filters published testing and certification information: Pure XP is NSF certified to Standard 42 and NSF/ANSI/CAN 372 for chlorine taste and odor reduction and lead-free materials. Review each product page and testing documentation for exact standards and claims. A point-of-use filter improves taste and odor and supplements, but does not replace, your utility's disinfection or any advisory instructions. Product performance can vary by water quality, usage, and filter replacement schedule. Last updated July 2026.