The EPA's secondary (aesthetic, non-enforceable) standard for aluminum is a range of 0.05 to 0.2 mg/L, set for water clarity and color rather than health.
Aluminum can occur naturally from geological sources, but it's also sometimes present as a residual from aluminum-based coagulants (such as alum) that some municipal treatment plants use to clarify water during processing, settling out suspended particles before the water reaches you.
Illustrative water-testing concept.
Watch For This
Signs to Look For
Slightly cloudy or discolored water
Municipal water from a plant that uses alum-based coagulation in its treatment process
No recent water test to confirm the actual level
A well in an area with aluminum-rich soil or bedrock
How We Fix It
Reverse Osmosis System
Reverse Osmosis System
Reverse osmosis filtration reduces aluminum along with other dissolved metals and particulates, regardless of whether it originated naturally or from the municipal treatment process.
Note: this is addressed by our reverse osmosis drinking-water system specifically — our whole-house filtration systems are not designed or certified to remove it.
Curious What's In Your Water?
We'll test it for free and show you exactly what a system would remove.
Some municipal plants use aluminum-based coagulants (like alum) to clarify water, helping suspended particles settle out during treatment. A small residual can remain in the finished water.
The EPA regulates it only as a non-enforceable aesthetic guideline, for clarity and color, not as a health-based standard.
A water test is the most reliable way — we offer one for free, with no cost or obligation.
