Part of the house
The water supply
Answered by Asked in Ayrshire · Updated · Sources at the foot
A private water supply is any water that reaches your taps from a spring, well, borehole, burn or loch instead of the Scottish Water mains, and keeping it safe is the owner's job.
Plenty of hill farms, steadings and cottages across East, North and South Ayrshire still drink from their own source. mygov.scot defines a private supply as water from somewhere other than the public mains, and says owners may need to register it, maintain the equipment, treat the water and report problems.
The main rule to know is that the water must be treated to make it safe, and disinfection is always needed to kill harmful bacteria. Brown water after rain, a failing UV lamp or falling pressure are all signs worth acting on.
Your council's environmental health team keeps the register, tests regulated supplies at least once a year and runs the grant of up to £800 per property (checked November 2026). The Drinking Water Quality Regulator checks that councils apply the 2017 regulations and publishes technical guidance on treatment. The questions below cover how to tell if you have a supply, testing, grants, colour, UV and pressure.
The 6 questions
- How do we know if we have a private water supply?
You probably have a private water supply if your water comes from a spring, well, borehole, burn or loch rather than the Scottish Water mains, and your council tax bill carries no water charge.
- Who tests a private water supply, and how often?
Your council's environmental health team tests a private water supply: at least once a year for regulated supplies, and on request for small single-house supplies, which may carry a fee.
- Is there a grant to improve a private water supply?
Yes, there is a grant to improve a private water supply in Scotland: up to £800 per property, paid through your council for work such as treatment, new tanks or replacing lead pipes (checked November 2026).
- Why is our spring water brown after heavy rain?
Spring water usually turns brown after heavy rain because the rain washes peaty organic matter from the hill into the source, and that colour can stop UV treatment working properly.
- Do we need a UV unit on our private supply?
Yes, most private supplies need a UV unit or another form of disinfection, because mygov.scot says a private supply will always need disinfection to kill harmful bacteria, and UV only works on clear, pre-filtered water.
- Why does the pressure on our private supply keep dropping?
Pressure on a private supply usually keeps dropping because a filter cartridge is clogging, the source runs low in dry weather, or the pump and pressure vessel are struggling.