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The 2026 open water season is starting without a bang. Neither the DSV nor World Aquatics have released new competition rules for 2026 – the current version of the WB-FT SW FS is in effect since 1.1.2025. However, many recreational athletes are still unfamiliar with the rules that have been in place since then. Here’s what’s important in May 2026 – and what you really need to know when swimming in lakes or open sea.

30.04.2026

What’s in effect for DSV competitions since 1.1.2025

The German Swimming Federation (DSV) has implemented a new version of the competition regulations for swimming in open water (WB-FT SW FS) as of January 1, 2025. The regulations were published on November 13, 2024, in the official DSV communications. There are no further changes for 2026 – what was valid in 2025 remains valid in 2026.

The key points for athletes competing in DSV events: water temperature is measured on the day of the competition, two hours before the first start, in the middle of the course and at a depth of 0.4 meters, in the presence of referees and safety officials. If the temperature is below 16°C or above 31°C, the competition will not be held. If it drops below 16°C between two measurements, a new measurement is taken after 30 minutes – this is the FINA guideline adopted by the DSV.

For the 2026 German Open Water Championships, there is an organizational change: the first competition day starts with the 10-kilometer races for men and women, followed by the 7.5-kilometer races for juniors. This is not a rule change, just a new schedule. Not relevant for you as a recreational athlete, but important for those with national team ambitions.

The Neoprene Rule: Where the Gray Area Lies

The really hard rule for competitions came in 2022 from FINA (now World Aquatics) and has been in effect ever since: above 18 degrees, no wetsuit; below 16 degrees, no start. In between – between 16 and 18 degrees – wetsuits are allowed, often even recommended, but not mandatory. This is the critical corridor in which many German lakes swim in May.

“If you start at 17 degrees in a T-shirt, you can, but it’s pointless. The wetsuit doesn’t make you faster, but it keeps you functional for longer. And being functional is everything in open water.”
– paraphrased from DSV open water doc, valid from 2025

What this means for you as a hobby starter in May

You’re not a competitive swimmer. You train in Lake Ammer, Lake Starnberg, Cannstatter Wasen, or Müritz. No one measures the temperature two hours in advance with a referee. You jump in and swim off. But: the rule logic is not an arbitrary act; it reflects physiological reality. Below 16 degrees, things happen in your body that you don’t experience in the pool – cold shock, loss of breathing control, muscle cramps, disorientation. That’s why the DSV no longer allows starts there.

For your hobby training, this means: below 15 degrees, wetsuits are mandatory, not optional. Below 12 degrees, you need gloves and a cap in addition. Below 10 degrees, you’re ice swimming – that’s a different discipline with its own rules and risks. Physics knows no hobby exceptions.

What’s on the agenda for 2026: Nomination, World Championships, Squad Structure

The 2026 season is eventful for the competitive sector despite a stable rule situation: for the 10-kilometer distance, the World Cup in Egypt is crucial for World Championship nomination, alongside pool races. The squad formation guidelines 2026/27 have been published; World Cup results and world ranking placements will now also be relevant for funding status. This is a structural issue that occupies the scene – even if it doesn’t directly count for the season’s start at Lake Starnberg.

For the hobby sector, the honest summary is: the rules are there, stable, and known since 2025. No one reinvented the wheel in 2026. What pays off for the masses: adjusting your own routines to the physiological limits codified in the rules. If you’re new to open water, you should train exclusively with accompaniment or in supervised zones for the first few seasons. If you’ve been around for a few years, you’ll find a solid addition to your breathing control under pressure in the freediving pool plan.

The season is open. The rules are clear. The water is still cold.

Cool-down

Click on a question to expand the answer.

Are there new DSV open water rules for 2026?

No. The current version of the WB-FT SW FS is valid from 1.1.2025 and was not revised for 2026. Organizationally, the schedule for the German Open Water Championships has changed slightly, but there are no changes to competition rules.

At what temperature do I need neoprene as a recreational swimmer?

Neoprene is mandatory below 15°C water temperature. Between 15°C and 18°C, it’s highly recommended. Above 18°C, you can swim without it – in competitions, it would even be prohibited above this limit. These limits are physiological, not arbitrary.

Does the temperature rule also apply to recreational training?

Formally, no – DSV and World Aquatics rules apply to registered competitions. Substantively, yes – the physics remain the same. Below 16°C, the risk of cold shock is real, even for recreational swimmers. If you’re swimming alone in a lake, you should use this rule as a guideline.

What’s the difference between DSV and FINA rules?

The DSV adopts FINA guidelines (now World Aquatics) for temperature and neoprene in its WB-FT SW FS. German competition regulations are thus a local implementation of international rules. For you as a competitor, the difference is practically zero.

AUTHOR:

Elias Kollböck

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Source Title Image: Pexels / Mark Gleeson