Private supplies can be excellent, but quality varies. Scotland's drinking water regulator says some supplies are very good, with adequate treatment and good management, while others present a risk to health, and outbreaks of disease have been linked to private supplies (DWQR).
Start with a test
Treatment should be chosen to deal with what's in the water. Your council's environmental health team can arrange sampling. In England, councils must risk-assess and monitor a single-dwelling supply if the owner or occupier asks (DWI). In Northern Ireland, contact your council's environmental health department to have a single private well tested (DAERA).
Common treatment
- Pre-filters remove sediment so later stages work properly.
- UV disinfection treats bacteria. It needs clear water and regular lamp changes.
- Specialist filters deal with problems such as iron, manganese or acidity, which a test will show.
- Softeners deal with hardness. They don't make water safe to drink on their own.
Maintenance matters
A treatment system only works if it's maintained: filters changed, UV lamps replaced on schedule and the unit kept powered. Ask any supplier for a written service schedule and the running costs before you buy.
Grants in Scotland
The Scottish private water supply grant of up to £800 per property can pay for installing treatment where the supply needs improving to make it safe, and your council may add funding if you have a low income (mygov.scot).
Frequently asked questions
Will a UV filter make my water safe?
UV treats bacteria and other micro-organisms, but only if the water is clear enough for the light to pass through and the lamp is maintained. It doesn't remove metals or chemicals. Base the system on a lab test.
Can I use the Scottish grant for a UV system?
Yes, installing treatment is one of the improvements the grant can pay for, up to £800 per property, if the supply is your main source of drinking water and needs improving to make it safe.
How often should treatment be serviced?
Follow the manufacturer's schedule. UV lamps and filter cartridges have set replacement intervals, and a supplier should give you these in writing.