# isResultUsable

> Whether a result takes part in derivations and limit comparisons. Only validation.status: "rejected" excludes it; absent validation equals unvalidated, and qualified results are kept.

> **isResultUsable**(`r`): `boolean`

Whether a result takes part in derivations and limit comparisons. Only
`validation.status: "rejected"` excludes it; absent validation equals
`unvalidated`, and `qualified` results are kept.

## Parameters

### r

`WaterQualityResult`

## Returns

`boolean`