How much iron is too much in well water?

The EPA secondary standard for iron is 0.3 ppm. Above that, you'll see staining, taste, and odor issues. The Murphy well tested at 4.2 ppm — 14 times the standard. At that level, staining is severe and a standard water softener alone will not solve the problem (and will actually be damaged by the iron).

Can a water softener remove iron from well water?

A softener can remove small amounts of dissolved iron (typically up to 1–2 ppm) as a side effect of the ion exchange process. Above that, iron fouls the resin bed and destroys softener performance. For well water with more than 1–2 ppm iron, a dedicated iron filter must be installed before the softener.

What causes the rotten egg smell in Delaware County well water?

The sulfur smell is hydrogen sulfide gas, produced when sulfur-reducing bacteria in the well casing react with naturally occurring sulfates in the groundwater. It's common in Delaware County wells, especially those with older casings or low water usage. Air injection oxidizes the hydrogen sulfide and significantly reduces the smell at the source.

How hard is Delaware County well water?

Delaware County well water is among the hardest in Central Ohio, typically ranging from 14–20 gpg. The county sits on thick limestone deposits that dissolve into the groundwater. The Murphy well tested at 17 gpg — classified as extremely hard.

Well Water Lewis Center, Delaware County

The problem: high iron, 17 gpg hardness, and hydrogen sulfide

System: Iron Boss Filter + Dynamic Series Water SoftenerSource: Private well

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This example illustrates a common water-quality situation we encounter in Central Ohio homes. Individual water conditions and treatment recommendations vary by home.

The problem: high iron, 17 gpg hardness, and hydrogen sulfide

Delaware County well water drawn from limestone aquifers is among the hardest and highest-iron water sources in Central Ohio. Orange staining on porcelain surfaces, rust-colored laundry, and a sulfur smell — especially first thing in the morning when water has been sitting in the pipes — are common complaints from well owners in this area.

Orange/rust staining on all toilets, sinks, and tubs

Replaced toilet seats twice; staining returned within days of cleaning

Rust-colored laundry — whites turned orange

Stopped washing whites; replaced several items of clothing

Rotten egg smell (hydrogen sulfide) in morning water

Ran water for 2–3 minutes before using; guests noticed immediately

17 gpg hardness causing scale on all fixtures

Showerheads replaced annually; dishwasher performance poor

Orange film in ice maker and refrigerator water dispenser

Stopped using built-in ice maker; bought bagged ice

What the well water test found

Iron level4.2 ppm (EPA secondary standard: 0.3 ppm — 14× over limit)

Manganese0.08 ppm ppm

Water hardness17 gpg

Hydrogen sulfideDetected (low level — sulfur-reducing bacteria activity)

pH7.1

Total dissolved solids520 mg/L mg/L

Technical note: Delaware County sits on some of the thickest limestone deposits in Ohio. Well water here routinely tests at 14–20 gpg hardness and 2–8 ppm iron. The hydrogen sulfide was produced by sulfur-reducing bacteria in the well casing reacting with naturally occurring sulfates — a common finding in Delaware County wells, especially those with older casings.

Three-stage solution: air injection → iron filter → softener

Iron at 4.2 ppm requires oxidation before filtration — you can't filter dissolved (ferrous) iron directly. The system uses air injection to oxidize iron to its solid (ferric) form, then filters it out, then softens the remaining hardness.

Air injection system

Injects a pocket of air into the water as it enters the treatment train. Oxidizes dissolved ferrous iron (Fe²⁺) to solid ferric iron (Fe³⁺) and oxidizes hydrogen sulfide gas, eliminating the rotten egg smell.

Iron Boss catalytic filter

Filters out the now-solid iron and manganese particles. Backwashes automatically to flush captured iron to drain. Handles up to 10 ppm iron.

Dynamic Series water softener

Removes the 17 gpg hardness after iron is gone. Iron must be removed before the softener — iron fouls the resin bed and destroys softener performance.

Install time: 7 hours — All three units installed in sequence in the utility room. Air injection head mounted on the pressure tank outlet. Iron filter and softener plumbed in series. Separate drain lines for each backwash cycle.

Results: dramatic improvement within 48 hours

Timeframe: 14 months

Metric	Before	After
Iron at tap	4.2 ppm (orange water)	< 0.05 ppm (undetectable)
Water hardness	17 gpg	0 gpg
Rotten egg smell	Every morning, strong	Gone within 24 hours of install
Toilet/sink staining	Orange within 2 days of cleaning	No new staining in 14 months
Laundry	Whites turned orange	Whites stay white
Ice maker	Unused — orange film	Back in use, clear ice

Cost comparison

System cost

$3,200 installed (all three stages)

Estimated 10-year savings

$5,800

Breakdown: Avoided fixture replacement ($1,200), clothing/laundry savings ($600), appliance lifespan extension ($2,400), cleaning product reduction ($400), bagged ice elimination ($1,200)

Frequently asked questions

Related resources

Lewis Center water quality guide Iron filter installation Well water treatment City water vs. well water Ohio All case studies

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