Beaches And Water Quality

Overview

Beaches are lovely places to relax, but the water can sometimes contain tiny germs that may make you ill. This article explains how to stay safe in the sea or lakes, and what to do if you feel unwell after a swim.

Illness from beach water is relatively rare, but it can happen in places where water quality is poor or after storms.

Anyone who swims in natural water can be affected, but young children, older adults, and people with weakened immune systems are more vulnerable.

Symptoms

Common symptoms

• Diarrhoea
• Vomiting
• Stomach cramps
• Nausea
• Fever
• Skin rash or itching
• Ear pain or discharge
• Red or irritated eyes

Symptoms in children

• Frequent loose stools
• Vomiting
• High temperature
• Fussiness or refusing to feed
• Drowsiness or low energy
• Sunken eyes or dry nappies

Symptoms in older adults

• Watery diarrhoea leading to dehydration
• Lightheadedness or confusion
• Muscle aches and fever
• Reduced urine output
• Worsening of existing health conditions such as heart or kidney problems

Causes

Main causes

• Swallowing water that contains human or animal waste
• Bacteria such as E. coli and Campylobacter
• Viruses such as norovirus
• Parasites such as Cryptosporidium
• Toxins from algal blooms
• Germs entering open cuts or scratches

Risk factors

• Swimming shortly after heavy rainfall
• Swimming near storm drains, rivers, or farmland
• Spending a long time in warm, still water
• Having a weakened immune system
• Being a young child or older adult

When to see a doctor

See a doctor urgently if:

• Severe stomach pain that gets worse
• Inability to keep any fluids down
• Dizziness or feeling faint when standing
• Blood in your stool or vomit
• Symptoms that get worse instead of better

Book a routine appointment if:

• Diarrhoea that lasts more than three days
• Persistent skin rash or ear discomfort
• A recent swim followed by flu-like symptoms

Diagnosis

A doctor will ask about your symptoms, where you have been swimming, and whether you ate or drank anything unusual. They will also check your heart rate, temperature, and look for signs of dehydration.

Tests that may be done

• A stool sample may be sent to a lab to look for germs.
• A blood test can check for infection or dehydration.
• A swab from a skin wound can identify bacteria.
• A urine sample may be used if a urinary infection is suspected.

What to expect at your appointment

Most people do not need tests. The doctor will usually advise rest, fluids, and what to watch for. If tests are ordered, you may need to bring a sample to your local clinic or lab.

Treatment

Treatment focuses on replacing lost fluids and easing symptoms while your body fights off the infection. In most cases, no medical medicine is needed.

Self-care at home

• Sip water or an oral rehydration solution frequently to stay hydrated
• Rest until you feel better
• Eat small, plain meals such as toast, rice, or bananas when ready
• Wash your hands often, especially after the toilet and before eating
• Use simple pain relief for fever if needed, following the instructions on the pack
• Avoid swimming until symptoms have fully gone

Medical treatments

A doctor may give fluids intravenously (through a drip) if you are seriously dehydrated. If tests show a bacterial infection, they may prescribe a course of antibiotics. Always take antibiotics exactly as directed and finish the full course.

When is surgery considered?

Surgery is not a standard treatment for beach-related water illnesses.

Living with this condition

While you recover, focus on rest and sipping fluids regularly. Keep a close eye on how much you urinate — this is a good sign of hydration. If you care for a child, check nappies and encourage small, frequent drinks.

Lifestyle tips

• Wait at least 48 hours after symptoms settle before swimming
• Shower after swimming to wash away any lingering germs
• Check current water quality reports before your next beach day
• If you have open cuts, keep them covered with waterproof plasters while in the water

Diet and exercise

When your appetite returns, start with light meals and avoid heavy, spicy, or dairy foods until you are fully better. Ease back into exercise gradually, as your body needs time to regain strength.

Mental health and emotional wellbeing

Getting ill can be stressful, especially if you worry about the beach. Remind yourself that most people recover well. If anxiety is affecting your daily life, speak to your GP.

Prevention

Yes, you can greatly lower your risk by checking water quality signs, avoiding swimming after heavy rain, and not swallowing water while swimming.

Vaccines

There is no vaccine for most water-related infections, but staying up to date with routine childhood vaccinations is always wise.

Screening programmes

No routine screening is needed. Health authorities regularly test beach water and issue warnings when levels are unsafe.

Complications

If left untreated

• Severe dehydration that may need a hospital stay
• Low salt levels causing muscle cramps or confusion
• Infections that spread to the bloodstream (rare)
• Kidney problems in people already at risk
• Prolonged skin infections that leave scars

Long-term outlook

With rest and enough fluids, you should feel much better within a few days. Severe complications are rare, and the human body is remarkably good at recovering from these infections.

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