Holiday Calendar

National Swimming Pool Day

Next celebratedSunday, July 11, 2027

One in eight routine US pool inspections ends with the pool closed on the spot; the swimming pool reads as pure leisure and is governed as a public-health facility.

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Last updated August 18, 2026 · by the Holiday Calendar TeamHave an update or spot an error?
YEARLY DATEJuly 11
OBSERVED INUnited States
CATEGORYSports
SUBCATEGORYIndividual Sports
ORIGIN

Community Origin

FOUNDING ENTITY
Not documented
FIRST OBSERVED
Not documented
HOW THE HOLIDAY CAME TO BE

Marked by the trade press, claimed by nobody.

No documented founder, establishing announcement, or registration for National Swimming Pool Day has been identified. The earliest independent coverage located is a trade-press article that itself reports the day has no well-documented origin.

+ Know the story? Submit a founder Help us complete this holiday
INTRO

One out of eight routine pool inspections ends in closure

One out of eight routine public pool inspections in the United States ends with the pool closed on the spot. The trigger is at least one violation that represents a serious threat to public health. National Swimming Pool Day belongs to the thing those inspectors are checking.

That is the split the day sits on. A pool reads as pure leisure and is governed as a public-health facility, and the American record carries both at once.

Nobody has claimed authorship. What the record holds instead is the subject: a century of American pool building, the exclusions written into it, and the federal safety machinery that grew up around it.

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ORIGINS

Swimming Pool Day history

INTRODUCTION

The earliest public water tank in the ancient world was not built for swimming. It sat at Mohenjo-daro, in what is now Pakistan, a brick tank sealed with gypsum plaster and a thick layer of bitumen so it would hold water.

It runs roughly 12 meters end to end. The deepest point reaches 2.4 meters, and most scholars agree it was used for religious functions rather than recreation.

Recreation and competition arrived much later. At the 1908 Olympics in London, the swimming races were held in a pool erected in the infield of the White City Stadium, just inside the running track. Ten nations met during those Games and formed the world swimming federation now called World Aquatics.

CHAPTER 01

Almost every town got a pool

The American pool boom began in the 1920s. It ran on through the 1940s, expanded by the Works Progress Administration, a New Deal agency, until almost every city and town in the country had a public pool.

Baltimore built a second pool at Druid Hill Park in 1921. It was the only one that accommodated the city's Black residents. It closed in 1956, after the city desegregated its pools.

CHAPTER 02

What closing the pools left behind

CDC has written the sequence down plainly. Racially segregated pools left Black swimmers fewer options, and the pools open to them were often too small and shallow for swimming. When integration was mandated, many pools closed, fewer new ones were built, and private clubs restricted access through membership and residency rules.

The gap outlived the pools. In a national survey, 36.8 percent of Black adults reported not knowing how to swim. Among White adults the figure was 6.9 percent.

National Swimming Pool Day arrives on top of all of that with no author. Pool Magazine, a trade publication, marked the day in 2023 and reported that it may not have a well-documented origin. That is still where the record ends.

WHY THIS DAY MATTERS

Why National Swimming Pool Day Matters

SEVERITY

44 percent admitted or transferred, against 4 percent of product injuries.

CPSC found that 44 percent of children younger than 15 treated in emergency departments for pool or spa drowning injuries from 2022 through 2024 were admitted to the hospital or transferred to another one. For all consumer-product-related emergency department injuries in that age group and period, the figure was 4 percent.

ACCESS

Millions of American adults never learned to swim

A CDC survey fielded in late 2023 estimated that 40 million U.S. adults, 15.4 percent of respondents, reported not knowing how to swim. More than half, 54.7 percent, reported never having taken a swimming lesson.

HOMES

Most child pool drownings happen at residences

CPSC counted an average of 376 children younger than 15 who fatally drowned in pool or spa incidents each year from 2021 to 2023, and nearly 80 percent of them were younger than five. More than 70 percent of those fatal drownings happened in residential settings.

BY THE NUMBERS

National Swimming Pool Day by the Numbers

10.4M
U.S. residential pools (PHTA)
309,000
U.S. public pools (PHTA)
7.3M
U.S. hot tubs in use (PHTA)
~4,500
Yearly ED visits, pool chemical injuries

TIMELINE

Timeline

Swimming moves into a built pool

Olympic races ran in a 100 metre pool erected inside the White City Stadium in London, and the world swimming federation was formed during those Games.

Baltimore builds a segregated pool

The second pool at Druid Hill Park was the only one in the city that accommodated Black residents.

New Deal pools reach Brooklyn

McCarren Pool opened at 54,450 square feet, one of 11 public pools built across New York City in the New Deal era.

The Druid Hill pool closes

It shut following the desegregation of Baltimore's public pools.

Congress sets pool safety rules

President George W. Bush signed the Virginia Graeme Baker Pool and Spa Safety Act on December 19, and it became effective in 2008.

GET INVOLVED

How to Observe National Swimming Pool Day

EDITOR'S PICK

Check your above-ground pool against the federal recall

In 2025 CPSC, Bestway, Intex and Polygroup recalled about 5 million above-ground pools 48 inches and taller whose external compression strap could give a child a foothold. CPSC believes nine children between 22 months and 3 years old drowned after getting in that way.

BOOK

Book a swimming lesson, or find one for a child

The U.S. National Water Safety Action Plan asks communities and organizations to provide affordable, accessible swimming lessons. The plan runs from 2023 to 2032, and lessons are one of the things it asks communities for.

READ

Read the federal count of child pool drownings

CPSC publishes an annual report on pool and spa drownings and submersion injuries involving children younger than 15. Its latest release sets out where and when those incidents happen.

WATCH

Watch a water polo match

The Collegiate Water Polo Association marks the day as a nod to the venue its sport is played in. In water polo the pool is not the setting, it is the field of play.

SPEND

Spend the day at a municipal pool

The U.S. National Water Safety Action Plan also asks communities to build or revitalize publicly accessible swimming pools. A municipal pool is what that phrase means in practice.

GET INVOLVED

Resources and Support

POOL

Pool Safely

Pool Safely. CPSC's pool and spa safety campaign, and the law behind it

Test your knowledge

How well do you know National Swimming Pool Day?

1 / 8

What do most scholars think the Great Bath at Mohenjo-daro was used for?

Answer

No. It is an unofficial observance with no proclamation or resolution behind it, so schools, banks and offices stay open as usual.

COLOPHON

Sources

How we know what’s on this page. References, not endorsements.

14sources
9primary records
8independently dated
Primary records
Centers for Disease Control and Prevention2024
About the Model Aquatic Health Code (MAHC)
Why public pools are inspected, how often inspections end in closure, and what outbreaks follow.
View source
Centers for Disease Control and Prevention2024-05-16
Vital Signs: Drowning Death Rates, Self-Reported Swimming Skill, Swimming Lesson Participation, and Recreational Water Exposure, United States, 2019-2023
National survey estimates of who can swim, who has had lessons, and how pool segregation shaped both.
View source
U.S. Consumer Product Safety Commission2026-06-24
CPSC Report Highlights Persistent Risk of Childhood Drowning
The current federal count of child pool and spa drownings, with where and when they happen.
View source
U.S. Consumer Product Safety Commission2025-05
Pool or Spa Submersion: Estimated Nonfatal Drowning Injuries and Reported Drownings, 2025 Report
How often a child's pool or spa submersion injury ends in hospital admission or transfer.
View source
U.S. Consumer Product Safety Commission2025-07-21
Bestway, Intex, and Polygroup Recall Certain Above-Ground Pools 48 Inches and Taller Due to Drowning Hazard
The 2025 recall of about five million above-ground pools with a climbable compression strap.
View source
Pool Safely, U.S. Consumer Product Safety Commission
About Us: the Pool Safely campaign and the Virginia Graeme Baker Pool and Spa Safety Act
When the federal pool and spa safety law was signed and when it took effect.
View source
Pool and Hot Tub Alliance
Benefits of Water, National Water Safety Month
The trade association's counts of residential pools, public pools and hot tubs in the country.
View source
Pool and Hot Tub Alliance
About National Water Safety Month
How the May water safety campaign began and which organizations run it.
View source
United Nations
World Drowning Prevention Day
The 2021 General Assembly resolution behind the 25 July observance.
View source
Additional coverage
Harappa.com
Great Bath, Mohenjo-Daro
The construction and probable ritual purpose of the earliest known public water tank.
View source
Olympedia
Swimming at the 1908 Summer Olympics
The pool built inside the White City Stadium and the founding of the world swimming federation.
View source
National Geographic2021-06-11
Public swimming pools are still haunted by segregation's legacy
The American municipal pool boom and the segregation that followed it, pool by pool.
View source
Pool Magazine2023-07-11
It's National Swimming Pool Day, So Let's Celebrate!
Trade-press coverage of the day, including its note that the origin is not well documented.
View source
Collegiate Water Polo Association2024-07-11
Celebrate Water Polo's Venue: Happy National Swimming Pool Day (July 11)
A national governing body marking July 11 as the day.
View source
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