Yes — and on many properties combining sources is the more sensible design. Rainwater is seasonal and limited by roof area; a borehole is more constant but depends on the aquifer and may need treatment. Together they complement each other, with municipal supply as the fallback.
How integration typically works
- Each source has its own inlet and appropriate pre-filtration
- Sources feed common storage, or dedicated tanks that are linked
- Level controls and priority logic decide which source fills the tanks first
- A single booster pump and pressure system serves the property
- Non-return protection and correct separation prevent cross-contamination or backfeeding into the municipal supply
Water quality between sources
The sources have different characteristics, so filtration must suit the blend that ends up in storage — or each source is treated before it enters. Where potable use is intended, testing after integration is essential.
Practical priority logic
A common approach is to use rainwater first while it lasts, fall back to the borehole, and use municipal supply only when both are short. That sequence maximises use of the free source and reduces borehole running hours.
Design it as one system
Problems generally arise when sources are added one at a time without revisiting the whole design — mismatched pressure, tanks that never fill, pumps cycling against each other. An assessment covering all sources at once avoids that.