ISO 21416:2019

Overview

ISO 21416:2019 - Recreational diving services - Requirements and guidance on environmentally sustainable practices in recreational diving - provides requirements and practical guidance for service providers to minimize negative impacts and maximize positive outcomes for the aquatic environment. Applicable to scuba diving, snorkelling and freediving, the standard helps stakeholders identify and compare dive operators and organizations that follow environmental best practice.

Key Topics and Requirements

ISO 21416:2019 covers operational, behavioural and conservation measures, including:

• Conduct of diving activities

  • Mandatory environmental briefings and site-specific pre-dive advice
  • Equipment streamlining and buoyancy control to avoid contact with habitats
  • Site selection matched to participant competency; choose non-sensitive sites when contact is likely

• Operation of dive boats

  • Prefer mooring buoys over anchors on sensitive seabeds
  • Responsible bilge, sewage and waste water management; well‑maintained engines to reduce pollution
  • Minimise propeller and acoustic impacts; provide waste receptacles on board

• Interaction with aquatic life

  • Policies discouraging removal (collecting) and feeding of aquatic life
  • Guidance on exceptions (e.g., regulated removal of invasive species) and legal compliance

• Conservation and pollution control

  • Consideration of site carrying capacity, anti‑fouling choices, oil/lubricant disposal, and avoidance of harmful sunscreens
  • Responsible use of lights, photography and night‑dive practices

• Shore-based facilities & heritage

  • Waste reduction, energy/resource efficiency and protection of underwater cultural heritage (wrecks, historic sites)

• Aquatic parks and protected areas

  • Support for marine protected areas, staff training on park rules and participant briefings

Annex A provides additional informative guidance on sustainable diving practices, monitoring and reporting environmental disturbances.

Practical Applications and Users

ISO 21416:2019 is intended for:

• Dive centres, schools, clubs and training organizations
• Dive boat operators and shore‑based facility managers
• Diving instructors, guides and tour operators
• Divers, snorkellers and freedivers seeking eco‑responsible experiences
• Governments and conservation bodies using the standard to assess and promote sustainable recreational diving

Typical uses include developing environmental policies, preparing pre‑dive briefings, designing operational procedures (anchoring, waste management), staff training, marketing eco‑certified services, and supporting local marine conservation efforts.

Related Standards

• ISO 24803 (recreational diving services - requirements for service providers)
• ISO 13289 (training and competency - referenced for service provider roles)
• Developed by ISO/TC 228 (Tourism and related services)

Keywords: ISO 21416:2019, recreational diving, environmentally sustainable practices, dive operators, scuba diving, snorkelling, dive boats, marine conservation, marine protected areas.