On 6 July 1988, John Stephens, a relief tanker driver working for ISC Chemicals, a Bristol-based subsidiary of Rio Tinto Zinc, arrived at Lowermoor<unk>  Treatment Works on Bodmin Moor and found it unmanned. Being unfamiliar with the location, he had been given a key by another driver and told simply that "once inside the gate, the aluminium sulphate tank is on the left". However, the key fit almost every lock used by the South West<unk>  Authority (SWWA). After twenty minutes looking for the correct tank he tried the key on a manhole cover and when it unlocked believed he had accessed the correct tank. He poured the load of 20 tonnes of aluminium sulphate, used to remove solid particles from raw<unk> , into the tank, which actually held treated<unk>  prior to distribution to the consumers in<unk> . This immediately contaminated the<unk>  supply to 20,000 local people and up to 10,000 tourists. The maximum recorded aluminium concentration was 620 milligrams per litre compared with the maximum concentration admissible at the time by the European Community of 0.2 milligrams per litre.
Camelford water pollution incident
Erwadi fire incident
Morinaga Milk arsenic poisoning incident
Japan Air Lines food poisoning incident
Bihar school meal poisoning incident
Yumiko-chan incident
Three Mile Island accident health effects
Mass-casualty incident