Well Water Iron PPM Calculator
Orange stains in the sink, metallic taste, rusty laundry — that is iron above 0.3 PPM. Enter your test result to see how bad it is and what treatment actually works at your level.
Calculator
Well Water Iron PPM Calculator
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Orange stains in the sink, metallic taste, rusty laundry — that is iron above 0.3 PPM. Enter your test result to see how bad it is and what treatment actually works at your level.
How to use this calculator
- Enter iron PPM.
- See the severity band.
- Get treatment options for your band.
The formula
Bands: <0.3 fine, 0.3–2 softener territory, 2–5 dedicated iron filter, 5+ professional treatment.
What the units mean
PPM (parts per million) — one part of solute per million parts of the total mixture. The workhorse unit for trace concentrations in water, air, and food.
Worked example
Test: 3.5 PPM → dedicated iron filtration needed; a softener alone will foul.
Quick reference
| Iron PPM | Verdict |
|---|---|
| <0.3 | Fine |
| 0.3–2 | Softener OK |
| 2–5 | Iron filter needed |
| 5+ | Pro treatment |
Dissolved (ferrous) iron.
Where you will actually use this
Iron treatment depends entirely on the level — a softener handles 2 PPM but not 10.
- Well water treatment planning
- Staining diagnosis
- Filter sizing
Mistakes that give wrong answers
- Treating iron bacteria like dissolved iron (different fix)
- Undersizing the filter
Key takeaways
- Formula: Staining starts ~0.3 PPM; treatment bands by level
- Remember: Dissolved (ferrous) iron.
- Watch out for: Treating iron bacteria like dissolved iron (different fix)
- Next step: run your own numbers in the calculator above, then verify with a measurement — calculated values are only as good as the inputs.
Frequently asked questions
What iron level stains fixtures?
Above ~0.3 PPM.
Can a water softener remove iron?
Up to ~2 PPM; beyond that use a dedicated iron filter.