Devon is served by 1 water company, and a ban is set per company, not per county. The county is genuinely the wrong unit of answer: your postcode decides.
South West Water could not be confirmed, so check with them directly. Which of these applies at your address depends on which one bills you.
We could not confirm South West Water’s current status from their own page, so we are not asserting a restriction. Check with your supplier before using a hosepipe.
Check with your supplier
Areas covered: Named areas of Mid Devon and parts of East Devon ONLY. Cornwall, Plymouth, Exeter and Torbay are NOT covered.