A white removable deposit at an aerator is consistent with mineral residue but does not measure whole-house hardness.
The same report explains that hardness is a water-quality characteristic, not a health-based safety concern. Calcium and magnesium can contribute to scale on fixtures, piping, and appliances, but visible residue still needs to be distinguished from corrosion, product damage, or another deposit.
Keep this boundary: Do not call the district water unsafe because it contains minerals or detected substances. The report provides regulatory context and reports compliance results.