If your well water leaves orange stains on toilets, fixtures, and laundry, iron is the cause. Iron is one of the most common well water contaminants in South Carolina, particularly in wells drawing from the Black Creek and Middendorf aquifers in Horry and Georgetown Counties, the Floridan aquifer in Beaufort County, and surficial aquifers along the Grand Strand coast. The EPA Secondary Maximum Contaminant Level for iron is 0.3 mg/L. Many SC wells test between 1 and 15 ppm. There are four types of iron in well water: ferrous (dissolved, clear water iron), ferric (red water iron, visible particles), iron bacteria (reddish slime in toilet tanks), and organic iron (tea colored, tannin bound). Each type requires a different treatment. Air injection oxidation filters handle ferrous and ferric iron from 2 to 15 ppm. Iron bacteria requires shock chlorination first. Organic iron needs a tannin filter. A proper water test is essential before you choose any system.
Not sure which type of iron is in your well?
Schedule a Free Water TestIron is a naturally occurring mineral that leaches into groundwater as water moves through iron bearing rock and soil. In South Carolina it is among the top complaints Solomon Home Water Solutions hears from well owners across the Grand Strand, Lowcountry, and coastal plain. Understanding your iron problem starts with knowing which aquifer your well taps and which type of iron is present. For broader context on coastal SC well chemistry, see our guide to coastal SC well water treatment and our Grand Strand water quality overview.
What are the different types of iron in well water?
Well water contains four types of iron: ferrous iron (dissolved, clear at the tap), ferric iron (red water with visible particles), iron bacteria (reddish slime in fixtures and toilet tanks), and organic iron (tea colored water from tannin bound compounds). Each type behaves differently and requires a different treatment approach.
Ferrous Iron (Clear Water Iron)
Ferrous iron is fully dissolved in the water and invisible at the tap. Your glass looks perfectly clear when filled, then slowly turns orange or brown as the iron oxidizes on contact with air. This is the most common form in deep aquifer wells across Horry County, Georgetown County, and the Lowcountry. Concentrations below 2 to 3 ppm can be captured by a water softener as a byproduct of ion exchange, but anything above that threshold demands a dedicated iron filter. Our companion article on whether a water softener removes iron covers the limits of that approach in detail.
Ferric Iron (Red Water Iron)
Ferric iron is already oxidized before it reaches your tap. You will see red, orange, or brown particles or cloudiness directly from the faucet. This form is more common in shallow surficial aquifer wells and in systems where water has partially oxidized inside a storage tank or pressure tank. Ferric iron is simpler to filter than ferrous because it is already a solid particle. A backwashing sediment filter or a combination air injection oxidation system will capture it. See our whole house water filtration systems page for specifications.
Iron Bacteria
Iron bacteria (Gallionella and Leptothrix are the two most common species in SC coastal wells) are microorganisms that feed on dissolved iron. They produce a reddish brown slime that coats toilet tanks, pipe interiors, and well screens. If you lift the lid on your toilet tank and see a reddish gelatinous mass, iron bacteria is almost certainly present. This form is common in surficial aquifer wells along Murrells Inlet, Conway, and Georgetown County. Iron bacteria creates favorable conditions for other pathogens and will clog oxidation filter media rapidly if not treated first. Shock chlorination of the well is required before any oxidation filter is installed. Our guide on UV water disinfection covers bacterial protection after iron treatment is in place.
Organic Iron (Tannin Bound Iron)
Organic iron occurs when iron binds to tannins and other organic compounds from decaying plant material in the soil. The result is yellow or tea colored water that will not respond to standard oxidation filtration. An air injection oxidation filter alone will not clear organic iron. You need a dedicated tannin removal filter upstream of any iron treatment system. Organic iron is most common in shallow wells near marshes, wetlands, and tidal areas across the SC coastal plain. Test results showing both elevated color and elevated iron together are a strong indicator of this form.
What is the best way to remove iron from well water?
The best method depends on the iron type and level. Air injection oxidation filters handle ferrous and ferric iron from 2 to 15 ppm. Iron bacteria requires shock chlorination before filtration. Organic iron requires a tannin filter. Levels above 10 ppm need a chemical feed system.
The treatment matrix below matches iron type and concentration to the correct system. Choosing a system without knowing your iron type is guesswork that leads to undersized equipment and fouled media. Our free on-site water test identifies iron type, concentration, pH, manganese, TDS, and hardness so we can specify the right solution on the first visit. Schedule yours through our contact page.
Iron Treatment Matrix
Whole house treatment protects your plumbing, appliances, and fixtures from the point water enters the home. See our whole house water refining systems for specifications. For installation in your area, visit our Beaufort water filtration, Bluffton water filtration, or Conway water filtration service pages.
Does a water softener remove iron from well water?
A water softener can remove ferrous iron below 2 to 3 ppm as a byproduct of the ion exchange process, but it is not designed as a primary iron removal system. At higher concentrations, iron fouls the resin bed and shortens softener life significantly.
Water softeners exchange calcium and magnesium ions for sodium ions to reduce hardness. Ferrous iron carries a positive charge in solution and gets swept through the resin during the sodium recharge cycle at low concentrations. But once iron exceeds 2 to 3 ppm, the resin becomes coated with iron deposits that impair softening capacity. A special resin cleaning product is needed to restore performance, and above 5 ppm a softener alone will fail as an iron control strategy. Ferric (particulate) iron and organic iron are not removed by softeners at all.
The correct sequence when your well has both iron and hardness: install an air injection oxidation filter first in the treatment train, then a water softener downstream. The iron filter handles the iron. The softener handles the hardness. Each system does its job without fouling the other. Read the full breakdown in our article on does a water softener remove iron. For context on what else SC well owners commonly find alongside iron in the Black Creek and Middendorf aquifer systems, see our Black Creek and Middendorf aquifer fluoride and radium guide.
How do I test for iron in my well water?
The most accurate approach is a certified laboratory analysis. SCDES (formerly SCDHEC) recommends testing private well water every year. A lab test identifies iron type, concentration, pH, manganese, and hardness, which is the complete picture needed before choosing a treatment system.
Free on-site test from Solomon Home Water Solutions
We test iron type and level, pH, manganese, hardness, and TDS at your home at no charge across Horry County, Georgetown County, Beaufort County, and surrounding areas. The test takes about 20 minutes and gives us everything needed to specify the right system. Schedule your free test here.
State certified laboratory
SCDES maintains a list of certified drinking water laboratories in South Carolina. A certified lab test is the gold standard for documenting iron levels, particularly when evaluating a new property or dealing with a dispute. Verify current requirements at the SCDES private well guidance portal. See also our summary of SCDES private well testing rules for 2026.
Home test kits
Colorimetric test strips and drop kits available at hardware stores provide a rough estimate of total dissolved iron. They cannot distinguish between ferrous and ferric iron or detect iron bacteria and organic iron. Use them as a screening tool only, not as the basis for system selection.
Iron levels can shift over time as aquifer conditions change, particularly after heavy rain events or drought cycles. If your existing treatment system seems to be losing effectiveness, retest the water before assuming the system needs replacement. A chemistry change in the well is often the cause.
Get Your Well Water Tested at No Charge
Solomon Home Water Solutions tests for iron type, pH, manganese, hardness, and TDS. Serving Murrells Inlet, Conway, Georgetown, Beaufort, Bluffton, and the Grand Strand.
Does reverse osmosis remove iron from water?
Reverse osmosis can remove ferric iron when a sediment prefilter is in place, but ferrous iron fouls the RO membrane above 0.05 ppm. Well water iron must be treated upstream with a whole house system. RO is best used as a point of use polishing step after whole house iron treatment is in place.
Reverse osmosis membranes work by forcing water under pressure through a semipermeable membrane that blocks dissolved solids. Ferric particles are captured by the sediment prefilter before reaching the membrane. But dissolved ferrous iron passes through the prefilter and oxidizes directly on the membrane surface, causing fouling that voids the manufacturer warranty and permanently reduces flow rate. This is why well water iron cannot be handled by an RO unit alone.
The correct sequence: install an air injection oxidation filter as your whole house solution first, then add a reverse osmosis unit at the kitchen tap as a point of use finishing step. The whole house system removes the iron. The RO unit removes residual dissolved solids, nitrates, and other contaminants to deliver bottled water quality from your kitchen faucet. Solomon Home Water Solutions designs both stages as an integrated system. See our Murrells Inlet water filtration service and Georgetown water filtration service for local installation options.
What level of iron in well water is dangerous?
Iron in well water is not classified as a health hazard at typical concentrations. The EPA does not enforce a Maximum Contaminant Level for iron. The Secondary Maximum Contaminant Level is 0.3 mg/L, set based on taste and staining rather than health risk.
According to the EPA National Drinking Water Regulations, iron falls under the Secondary Maximum Contaminant Level program, which governs aesthetic qualities like taste, odor, and color rather than direct health protection. The 0.3 mg/L SMCL is not enforceable and applies to public systems, not private wells. SC well owners are still encouraged to treat iron at or above this level because staining, taste, and appliance damage are significant practical problems.
The one exception to the non-health-threat classification is iron bacteria. Gallionella and Leptothrix species are not major pathogens by themselves, but their biofilm creates a protected environment where coliform bacteria and other harmful organisms can shelter and multiply. Any well with confirmed iron bacteria should be tested for total coliform and E. coli simultaneously and shocked with chlorine before the results are considered reliable. For other contaminants that commonly appear alongside iron in SC wells, see our saltwater intrusion in coastal SC wells guide.
Iron Level Reference
How does iron affect South Carolina well water?
Iron is a widespread issue in South Carolina wells across all aquifer systems. The Black Creek and Middendorf aquifers in Horry and Georgetown Counties are known for elevated iron and manganese. Coastal surficial aquifer wells in Murrells Inlet, Conway, and Georgetown County commonly show iron staining and iron bacteria.
South Carolina has three primary aquifer systems that private well owners tap. Each has a distinct iron profile:
Black Creek and Middendorf Aquifers (Horry and Georgetown Counties)
Wells drawing from the Black Creek and Middendorf aquifers in the Myrtle Beach, Conway, and Georgetown areas frequently test between 1 and 8 ppm for iron, often paired with elevated manganese. Both minerals are released as water moves through ancient clay and sand layers within these formations. Iron staining on toilets, laundry, and fixtures is the most common complaint Solomon Home Water Solutions sees in Murrells Inlet and Conway area installations. An air injection oxidation system that addresses both iron and manganese simultaneously is the standard solution for Black Creek and Middendorf wells. Read more in our Black Creek and Middendorf aquifer contaminant guide and our Conway water filtration service page.
Floridan Aquifer (Beaufort, Jasper, and Colleton Counties)
The Floridan aquifer, tapped by many wells in Bluffton, Okatie, Hardeeville, and Beaufort, can carry moderate iron from clay layers within the limestone formation. Iron levels in Floridan wells typically run lower than in the Black Creek system (0.5 to 3 ppm is common) but are frequently paired with hardness and occasional hydrogen sulfide. An air injection oxidation filter followed by a water softener is the most effective configuration for these wells. For local service see our Beaufort water filtration service and Bluffton water filtration service.
Surficial Aquifer (Coastal Plain and Tidal Areas)
Shallow surficial aquifer wells throughout the SC coastal plain, particularly in low-lying tidal and marsh-adjacent areas of Murrells Inlet, Garden City, Pawleys Island, and Georgetown County, are the most likely source of iron bacteria contamination. The shallow depth means these wells intercept organic-rich soils where iron bacteria populations thrive. Surficial wells may also carry organic iron, which requires tannin filtration, and they face higher risk of saltwater intrusion. See our saltwater intrusion guide for wells in flood-prone coastal areas. Our Murrells Inlet water filtration and Georgetown water filtration teams service these areas directly.
South Carolina private well oversight transferred from SCDHEC to SCDES (SC Department of Environmental Services) on July 1, 2024, following the state agency split. SCDES now holds jurisdiction over private well permitting, testing guidance, and residential water quality standards statewide. For current testing requirements, verify with SCDES directly or review our summary of SCDES private well testing rules for 2026.
Iron problems in SC wells are almost always solvable with the right treatment sequence. The key is accurate diagnosis first. Every Solomon Home Water Solutions iron installation begins with a free on-site water test that covers iron type, concentration, pH, manganese, hardness, and TDS. Contact our team through the contact page or see our coastal SC well water treatment guide for the full picture of what SC well owners face.