Why Is My Well Water Brown? Causes & How to Fix

Diagnosing the Cause

Quick Tests

The Running Test

1. Run cold water from an outdoor faucet (bypasses plumbing)
2. If clear outside but brown inside → plumbing issue
3. If brown from outdoor faucet → well/aquifer issue

Iron (Most Common Cause)

Types of Iron

• Ferrous (clear water iron): Water looks clear from tap, turns brown when exposed to air
• Ferric (red water iron): Already oxidized, water is brown/orange immediately
• Organic iron: Bound to organic matter, harder to treat

Common Signs

• Orange/red staining in toilet, sink
• Metallic taste
• Stained laundry
• Discolored dishes

How Much Is Too Much?

• 0.3 mg/L: EPA secondary standard (aesthetic)
• 0.5-1 mg/L: Noticeable staining begins
• 3+ mg/L: Significant staining, needs treatment

Health Risk?

Iron is not a health hazard at typical well water levels. It's an aesthetic/nuisance issue. Your body actually needs iron—just not from your water fixtures.

Manganese

Characteristics

• Often present with iron
• Brown to black staining
• May affect taste
• Stains are harder to remove than iron

EPA Guidance

• Secondary standard: 0.05 mg/L
• Health advisory for children: 0.3 mg/L
• Above 0.05 causes staining

Treatment

Manganese often requires oxidation + filtration. Many iron filters handle both iron and manganese.

Rust/Corrosion

Sources

• Old galvanized pipes
• Steel well casing
• Water heater tank
• Old fittings

Signs It's Plumbing

• Brown water clears after running
• Worse in morning (overnight stagnation)
• Only from certain faucets
• Hot water only (water heater)

Solutions

• Replace old galvanized pipes
• Flush water heater
• Replace deteriorating well casing

Sediment

Causes

• Disturbed during pump work
• Heavy pumping exceeding well capacity
• Deteriorating well screen
• Natural aquifer changes
• Nearby construction or drilling

Characteristics

• Settles to bottom of glass
• May be gritty
• Often temporary after disturbance
• Can clog fixtures and appliances

Solutions

• Let it settle if temporary (after well work)
• Install sediment filter
• Well rehabilitation if chronic

Iron Bacteria

What It Is

Bacteria that feed on iron in water, creating slimy biofilm and contributing to discoloration.

Signs

• Slimy deposits in toilet tank
• Reddish-brown slime on fixtures
• Musty or swampy odor
• Rainbow sheen on standing water

Treatment

• Shock chlorination (may need repeated)
• Well rehabilitation for severe cases
• Continuous chlorination if recurring

Health Risk?

Iron bacteria themselves aren't harmful but indicate conditions that could harbor other bacteria. Test water if iron bacteria is present.

Solutions by Cause

We service all major pump brands including Franklin Electric, Grundfos, Goulds (Xylem), and Sta-Rite (Pentair). Our trucks carry common parts and components for same-day repairs.

Frequently Asked Questions

Why did my well water turn brown suddenly?

Sudden changes are often from disturbed sediment, rust breaking loose, or pump issues. Heavy rain can also introduce surface water. If it doesn't clear, investigate the cause.

Is brown well water safe to drink?

Iron and manganese aren't health hazards but are unpleasant. Sediment or surface water intrusion could contain bacteria. When in doubt, test the water.

Will a water softener fix brown water?

Only for low iron levels (under 1-2 mg/L). Higher iron needs oxidizing filter before or instead of softener.

Why is my hot water brown but cold water clear?

Sediment buildup in water heater tank, or the sacrificial anode is deteriorating. Flush the tank or replace anode.

Can brown water damage appliances?

Yes—iron and sediment can clog and stain appliances, reduce efficiency, and shorten lifespan. Treatment protects your investment.