Exclusive: Polluted water was released into loch near Glasgow because Royal Navy failed to maintain 1,500 water pipes, says watchdog

Radioactive water from the base that holds the UK’s nuclear bombs was allowed to leak into the sea after old pipes repeatedly burst, official files have revealed.

The radioactive material was released into Loch Long, a sea loch near Glasgow in western Scotland, because the Royal Navy failed to properly maintain a network of 1,500 water pipes on the base, a regulator found.

The armaments depot at Coulport on Loch Long is one of the most secure and secretive military sites in the UK. It holds the Royal Navy’s supply of nuclear warheads for its fleet of four Trident submarines, which are based nearby.

Files compiled by the Scottish Environment Protection Agency (Sepa), a government pollution watchdog, suggest that up to half the components at the base were beyond their design life when the leaks occurred.