State guide, updated 2026-11-14

Rust stains from Georgia well water: what UGA data shows and how to fix it

Short answer: Georgia rust stains come from well water carrying iron, and UGA lab data shows it in every region of the state. Lift the stains with a rust stain remover, a wet dwell and a long rinse, protecting your plants. Then get a test through your county UGA Extension office and fix the source with sprinkler aim or an oxidizing filter.

What 44,000 Georgia water samples show

Georgia has unusually good public data on this. UGA Extension's circular Iron and Manganese draws on more than 44,000 household well and municipal samples analyzed at the UGA Agricultural and Environmental Services Laboratories between 1993 and 2012. It found iron and manganese problems statewide, in wells drawing from both shallow and deep groundwater. Staining is likely at 0.30 ppm of iron and 0.05 ppm of manganese, the same values as the EPA secondary guidelines.

Source: UGA Extension Circular 858-11. The takeaway is that no part of Georgia is exempt. A North Georgia mountain home and a South Georgia farmhouse both have roughly the same odds of a staining well.

Iron, manganese or iron bacteria

UGA gives a simple color guide. Iron leaves reddish brown stains on sinks, fixtures, laundry and anything the sprinklers hit. Manganese stains and specks run from dark gray to black. Iron bacteria form a slimy brown, red, dark gray or black film, and UGA notes they can be a problem at iron levels as low as 0.01 ppm, far below the level that stains. If your irrigation heads clog with orange slime, think bacteria.

A rust stain remover works on the orange and reddish brown. Black manganese stains are more stubborn and may need a second pass or a different product. Red clay is another Georgia lookalike: a clay smear sits on top and scrubs off with soap and water, while iron from well water comes back in the same arc every time the system runs.

Georgia surfaces we see most

• Concrete driveways and walks. The classic orange fan from a rotor. See our concrete rust stain guide.
• Brick foundations and walls. Test a hidden brick first. Some brick and colored mortar lighten.
• Vinyl siding and fences. Common on newer Georgia homes and usually easy. See the vinyl siding guide.
• Pavers and pool decks. Test a paver, rinse first, keep runoff out of the pool, and never mix with chlorine or bleach.
• Do not use on marble, limestone, travertine or other quarried stone. It can etch them. Test any granite in a hidden spot first.

How to remove the stains

1. Pick a cool part of the day. Georgia summers dry a slab fast, and the product only works wet.
2. Gloves and sealed goggles.
3. Soak the landscape. Water the turf edge, shrubs and beds with plain water before you start, so runoff meets wet roots and leaves.
4. Wet the surface with a hose.
5. Apply evenly and keep it wet for the label dwell time, misting again if it starts to dry.
6. Scrub with a stiff nylon brush on concrete and a soft brush on siding and painted trim.
7. Rinse thoroughly, then rinse the plants again. Repeat on old or dark stains.

Big jobs go faster with a plastic pump-up or backpack sprayer. See rust remover for pump sprayers.

Testing through UGA Extension

UGA recommends starting with a basic water test through your county Extension office. The circular adds an important detail: iron may need to be sampled at the wellhead rather than an indoor faucet, so call your Extension agent before you fill the bottle. Ask for iron and manganese by name. If you have a sulfur smell too, mention it, since the treatment choice changes.

Fixing the source

• Aim the sprinklers. Keep spray off the house, slab and fence. Our irrigation rust stain guide walks through it.
• Know the softener limit. UGA says ion exchange softeners may work only up to about 5 ppm of combined iron and manganese.
• Consider an oxidizing filter. UGA Extension Bulletin 1563, Oxidizing Filters, describes an inline, point-of-entry device that treats the whole household supply and removes iron, manganese and hydrogen sulfide. It suggests considering one when iron is above 0.30 mg/L or manganese above 0.05 mg/L, choosing NSF or WQA certified equipment, and keeping a log of tests and maintenance. Backwashing on schedule matters.
• Treat iron bacteria separately. UGA notes chlorination is the preferred method for iron bacteria.
• Retest after treatment. Once a filter is in, a follow-up test tells you whether it is doing its job. If the slab starts to stain again a year later, check the backwash schedule and media before blaming the well.

Which SpraySticks to use in Georgia

For siding, brick, concrete and fences, use the green HOME line. For trucks, trailers and wheels, the red AUTO line, and for boats on Lanier or the coast, the blue MARINE line. Spray bottle jobs use sticks: one stick per 16 to 24 oz bottle for light stains, two for heavy. Pump-up and backpack sprayer jobs use gallon pods: one per gallon for heavy stains, one per 1.5 gallons for light, and four fill a backpack sprayer. It ships dry by ground in the lower 48. See the shop.

Safety

Same compound as spinach. Way less friendly than a salad.

Wear gloves and eye protection, keep children and pets off the area until rinsed, store sticks and pods sealed and out of reach, and never mix with bleach, chlorine or other cleaners. Read the safety data sheet before you start. Neighbors can compare notes on our South Carolina, North Carolina and Florida pages.

Spinach check: SpraySticks shares a compound with spinach. That does not make it food or gentle. Gloves, eye protection, keep kids and pets away, never mix with bleach, and read the SDS.

Common questions

How common is iron in Georgia well water?

UGA Extension analyzed more than 44,000 household well and municipal samples tested at its lab from 1993 to 2012. Depending on the region, 12% to 17% of samples were above the 0.3 ppm iron level where staining is likely, and 11% to 20% were above the manganese level. Problems showed up statewide, in both shallow and deep wells.

Is it iron or manganese staining my house?

Color tells you. UGA Extension says iron leaves reddish brown stains, while manganese stains and specks range from dark gray to black. Iron bacteria form a slimy brown, red, dark gray or black film. Many Georgia wells carry both metals, so a lab test is the only way to know your mix.

Where do I get my Georgia well tested?

Start with your county UGA Extension office, which can arrange a basic water test through the UGA Agricultural and Environmental Services Laboratories. Talk to your agent before you sample, because UGA notes iron samples may need to be taken at the wellhead rather than an indoor faucet.

Will a water softener fix the iron?

Only up to a point. UGA Extension says softeners may work only up to about 5 ppm of combined iron and manganese. For higher levels, or for iron and manganese together with a sulfur smell, UGA describes oxidizing filters, which treat the whole household supply. Test first and choose a system certified by NSF or the Water Quality Association.