Toilets, waste and antifouling: The marina rules every sailor should know before the summer holiday

Most sailors want to do things properly. Very few of us pull into a harbour with a plan to leave waste, sewage, oil, paint residue or hassle behind for the next guest. And yet it's exactly the small practical things that tend to cause friction in marinas: a rubbish bag in the wrong place, a holding tank that wasn't emptied correctly, a power cable laid across the pontoon, a hose left running, or a boat being scrubbed down in a way the harbour doesn't actually allow.

It isn't that sailors have suddenly stopped caring. It's usually because rules, facilities and practices vary from harbour to harbour, and from country to country. What seems obvious in one marina can be wrong in the next. Some harbours have clear signage and well-equipped recycling stations. Others have sparser facilities, limited opening hours, or local rules you only discover once you're standing there with the problem in your hands.

That's why looking after the environment in harbour isn't just "green talk". It's modern seamanship. It's about using the harbour properly, without making life harder for the harbour master, the local boat owners, the next guest, or the water we all sail on.

It starts before you tie up

A good harbour visit doesn't begin at the rubbish container. It begins when you're planning the trip. Does the harbour have a pump-out for sewage? Is there a hazardous waste station for oil, filters, batteries and chemicals? Where do you take ordinary household rubbish? Is there sorting? Are you allowed to wash the boat in the harbour? Are there particular rules around hull cleaning, sanding or using a pressure washer?

This matters especially on longer summer cruises, where the boat quickly becomes a small floating home. Packaging comes aboard, food scraps, bottles, cans, used rags, grey water, toilet waste, and perhaps the odd bit of technical waste from small repairs. If you haven't thought it through in advance, you end up standing in a guest harbour looking for solutions at exactly the moment when everyone else needs the same facilities.

The good guest checks the harbour out before the need arises. Not to be sanctimonious, but to avoid bad last-minute decisions.

Sewage: The detail most people would rather not talk about

An onboard heads is a practical thing. It gives you freedom on a trip, especially for families, older sailors, and boats lying at anchor or sailing longer legs. But that freedom comes with responsibility. A holding tank isn't just a piece of plumbing; it's part of how the boat handles its environmental footprint.

In practice you need to know three things: how much the tank holds, how it's emptied, and where you can realistically dispose of the contents. It sounds simple, but plenty of boat owners still sail with uncertainty about exactly that. Some tanks are small. Some installations are old. Some deck fittings are awkwardly placed. Some systems smell because hoses or vents aren't working properly. And some sailors only spot the problem when the tank is full.

By then it's too late. Plan tank emptying as part of the route, especially in high season. If the harbour has a pump-out station, use it in good time. Don't wait until the morning of departure, when the queue is long and everyone wants to be off. If you have trouble with the equipment, ask the harbour for guidance, but don't expect harbour staff to fix a faulty installation on board.

Good practice when emptying the holding tank

• Check the harbour's instructions before you start.
• Wear gloves, and avoid spillage on the pontoon, quay and equipment.
• Rinse afterwards if the harbour offers the option.
• Leave the equipment tidy, so the next boat can use it without trouble.
• Report any faults if the pump, hose or coupling isn't working properly.

It's not the glamorous side of sailing. But it's one of those things that clearly separates an experienced, considerate sailor from a guest who's just hoping the problem will go away on its own.

Waste on board: Sorting starts in the cabin

Rubbish in a harbour quickly becomes a nuisance when it isn't handled properly. Overflowing bins, mixed waste, bags dumped beside the containers and food scraps in open rubbish bins all attract gulls, rats and bad smells. That isn't only the harbour's fault. The harbour provides the facilities; the guests decide whether they actually work.

The easiest solution is to sort waste already on board. Keep a fixed bag or box for deposit returns, glass, metal and ordinary residual waste. If you've got space, separate paper, plastic and hazardous waste too. It doesn't need to look like a council recycling centre down in the saloon. It just needs to be practical enough that you don't end up with one big mixed sack when you go ashore.

Pay particular attention to things that don't belong in ordinary rubbish bins:

• oil and oily rags
• fuel filters and oil filters
• batteries and electronics
• paint residue, thinners and chemicals
• gas canisters and pressure containers
• distress flares and pyrotechnics

All of that needs handling according to the harbour's or the authorities' instructions. If you're in doubt, ask. It's far better than dumping it in the wrong place and turning it into a hazard for someone else.

Antifouling and boat washing: Where things can go wrong fast

Antifouling is one of those areas where "I'll just do what I usually do" can be a poor strategy. Many antifouling paints contain substances you really shouldn't be spreading into the harbour basin, on the slipway, or out across an ordinary gravel yard. That goes for sanding, scrubbing and washing alike.

That's why many harbours have specific rules about boat washing, pressure washing, sanding and shore-side work. In some places the boat has to stand on a wash-down area with collection. In others, certain types of work are only allowed in designated areas. Some harbours allow ordinary rinsing but not antifouling removal. Others have very specific requirements around tarpaulins, vacuum extraction or waste handling.

As a visiting sailor you may not be in the harbour for major winter work, but the issue also crops up with the small jobs: a quick scrub of the waterline, removing growth, a touch-up repair, a brush with paint residue on it, or a bucket of dirty wash water.

Ask before you start. That's the simple rule. It may feel excessive if you're just sorting "a little thing", but it's far easier to ask first than to end up with a harbour master telling you to stop.

Power and water: Use the facilities as if someone else were paying for them

Shore power and water feel like a natural part of a guest berth. But they aren't free for the harbour to provide, maintain or repair. And in busy periods, careless use of power and water can lead to dangerous situations and unnecessary friction.

Power cables need to be in good condition, rated for outdoor use and laid out so people don't trip over them. Don't use half-worn extension leads, dodgy adapters or creative arrangements just because it'll "probably do for one night". Water and electricity make a poor combination, and pontoons aren't the place for improvised installations.

The same goes for water. Fill the tank, rinse what you need to, and turn it off. Don't leave the hose running while you do something else. Don't use drinking water as if the harbour had unlimited supply. In times of drought, supply pressure or a marina full of guest boats, water consumption can become a real problem.

The hazardous waste station isn't a junk drawer

A well-run hazardous waste station is a gift to visiting sailors. It's where you can get rid of things that don't belong in ordinary rubbish. But it only works if the people using it respect the system.

Don't leave items outside locked cabinets. Don't mix oil, paint, chemicals and household waste. Don't leave unlabelled cans behind. And don't use the station as a free clear-out for everything you couldn't be bothered to deal with at home.

If you've got larger amounts of hazardous waste, old batteries, worn-out spare parts or other heavy waste, check first whether the guest harbour can actually take it. Many harbours are set up for normal waste from visiting boats, not to function as a full recycling centre for a major boat project.

When the rules vary from country to country

NorDok covers several countries, and that's exactly why you shouldn't assume things work the way they do back home. Denmark, Sweden, Norway, Germany and Poland have different rules, regulatory practices, harbour structures and local traditions. A Danish sailor in Sweden, a German sailor in Denmark or a Swedish sailor in Poland can easily misread what's expected.

This applies in particular to sewage, waste sorting, harbour fees, access to facilities and handling of hazardous waste. In some places the signage is clear. In others you'll need to read the harbour's website, use its app, contact the harbour master or look for notices by the service building.

The practical answer isn't to memorise every rule. It's to build a steady routine: check the harbour's information, read the signs, ask when in doubt, and deal with things before they become urgent.

The good guest makes the harbour easier to run

There's a tendency to view harbours as service centres: you pay your harbour fee and expect everything to work. Fair enough. But harbours are also practical workplaces, volunteer associations, small communities and technical installations with limited resources.

When guests use the facilities properly, the harbour becomes easier to run. When they don't, the work gets heavier. Harbour staff have to clear up, explain, repair, sort, deal with spills, handle complaints and put right mistakes that could have been avoided.

This isn't about making visiting harbours awkward. Quite the opposite. The better we use the harbours as sailors, the better the chance that the facilities get maintained, expanded and kept open.

A simple checklist before this summer's harbour visits

• Check the harbour's information before you arrive.
• Plan your pump-out before the holding tank is full.
• Sort waste on board, so it's easy to dispose of correctly.
• Ask before washing the boat, cleaning the hull or working with paint and chemicals.
• Use power and water properly, with safe cables and no waste.
• Leave shared equipment tidy, even when no one is watching.
• Report faults rather than just walking on.

It's still the small choices on the water that count

Looking after the environment in harbour doesn't have to be a solemn business. It doesn't require every sailor to become an expert in legislation, chemistry or marine biology. It just requires us to take the practical choices seriously.

Empty the heads in the right place. Dispose of waste correctly. Don't rinse paint, oil or dirty wash water away where it doesn't belong. Use power and water with a bit of thought. Respect the harbour's instructions, even when they feel a touch inconvenient.

It isn't only for the environment's sake. It's for the harbour's, the harbour master's, the next boat's and your own sake too. A harbour works best when it doesn't have to spend its energy clearing up after guests who should have known better.

Good seamanship doesn't stop when the mooring lines are made fast. It carries on at the waste station, at the pump-out, at the tap, at the shore-power post and on the wash-down area. And in the end it's pretty straightforward: leave the harbour the way you'd like to find it yourself.