Treating cryptosporidiosis with ozone at Dartington Hall Estate in England

The Dartington Estate, in the South-West in England, has a Private Water Supply which supplies about 150 m3/d to domestic properties, shops and some industrial business premises. There is a requirement for the Estate to provide ‘wholesome’ potable water to its customers and the water quality needs to be compliant with the Private Water Supplies (Water Quality) Regulations 2016, which came into effect on 27 June 2016. Nijhuis Industries advised the Estate Management that it would be required to include an ozone treatment of the water supply to safeguard against any ingress of cryptosporidium. Since the beginning of 2019, the ozone installation is ready for transportation to the Dartington Hall Estate and will be installed and commissioned during the year.


The Private Water Treatment Works is supplied from two raw water borehole supplies which are derived from the River Dart, after being filtered through the watercourse bedrock. The raw water supply is potentially vulnerable to the presence of the cryptosporidium organism, as the river drains through an agricultural catchment area. Cryptosporidium is a microscopic parasite that causes the diarrheal disease cryptosporidiosis. Both the parasite and the disease are commonly known as “Crypto.” There are many species of cryptosporidium that infect animals, some of which also infect humans.

  • Dartington-Hall-Estate-example-Nijhuis-ozone-unit

Client benefits / Nijhuis impact

  • Improve the raw water supply
  • Safeguard against any ingress of cryptosporidium.
  • Chemical-free solution with a Nijhuis ozone installation (NOX50 Ozonation Unit)