Is It Safe to Surf After It Rains?
The standard recommendation is wait 72 hours after rain before surfing near urban runoff. Storm drains flush bacteria (fecal coliform, Enterococcus), chemicals, and debris into the ocean. A Surfrider Foundation study found 12 extra illness cases per 1,000 surfers in wet-weather conditions.
2 min read
Key Takeaways
- Wait 72 hours after rain near urban areas. Storm drains flush bacteria and chemicals. Risk increases near river mouths and storm drain outfalls.
- Storm drains near surf breaks spike bacteria 10-100x after rain. Highest risk: near river mouths and in enclosed bays. Open coast clears faster.
- Check Heal the Bay or Surfrider water quality reports. Choose open-coast breaks far from drains. Shower immediately after surfing post-rain.
The Short Answer
The standard recommendation from the Surfrider Foundation and public health agencies is wait 72 hours after rain before surfing near urban areas. Storm drains flush bacteria (fecal coliform, Enterococcus), chemicals, oil, pesticides, and debris into the ocean. A Surfrider study found 12 extra illness cases per 1,000 surfers exposed to wet-weather runoff. Risk varies by location, rainfall intensity, and proximity to storm drain outfalls and river mouths.
What's Actually in the Water After Rain
Urban runoff carries fecal indicator bacteria (from pet waste, sewage overflows, and homeless encampments), heavy metals (from road surfaces), pesticides and herbicides (from lawns and agriculture), and oil and grease (from parking lots). The EPA's BEACH Act requires monitoring at popular swimming beaches, but surf breaks often fall outside monitored zones.
Risk factors: proximity to a storm drain outfall or river mouth (highest risk — bacteria counts spike 10-100x), rainfall intensity (heavy rain overwhelms treatment systems), and water circulation (enclosed bays flush slower than exposed coastline). Open-coast point breaks far from rivers clear faster than enclosed beach breaks near harbors. The San Diego River mouth, Malibu Creek, and Tijuana River are notoriously polluted after rain.
“Storm drains near surf breaks spike bacteria 10-100x after rain. Highest risk: near river mouths and in enclosed bays. Open coast clears faster.”
What This Means for Your Session
After rain, avoid breaks near storm drains, river mouths, and harbors for 72 hours. Check local water quality reports — Heal the Bay (California) and Surfrider publish near-real-time beach grades. If you must surf sooner, choose an open-coast break far from runoff sources with good water circulation. Avoid getting water in your mouth, eyes, and open cuts. Shower immediately after. Ear plugs reduce ear infection risk. If you develop fever, gastrointestinal symptoms, or ear/sinus infection within 72 hours of surfing post-rain, see a doctor and mention ocean exposure.
Frequently Asked Questions
Is the 72-hour rule always necessary?+
It depends on location. Open coastline far from rivers clears in 24-48 hours. Near river mouths or harbors, 72 hours is the minimum. After major storms, some areas like the Tijuana River zone can stay contaminated for a week or more.
Can rain actually improve surf conditions?+
Yes — storms that bring rain also bring swell. The irony of surfing is that the same weather system producing great waves also contaminates the water. Many surfers accept the risk for a pumping storm swell, but it's a personal health decision.
What illness symptoms come from contaminated water?+
Most common: gastroenteritis (nausea, diarrhea, cramps) from swallowing water, ear infections (otitis externa), sinus infections, and skin rashes. Symptoms typically appear 12-72 hours after exposure. Serious infections are rare but possible with open wounds.
Where can I check water quality before surfing?+
Heal the Bay (healthebay.org/beach-report-card) covers California. Surfrider Foundation (surfrider.org) covers national beaches. Many counties post advisories at beaches after rain. Check before you paddle — especially near urban areas.
