ProblemRotten Egg Smell
A sulfur or rotten-egg odor in well water is most often hydrogen sulfide gas or sulfur-reducing bacteria. The hot-vs-cold and one-tap-vs-all-taps pattern usually reveals the source.
4 min readReviewed October 20, 2026
For private well owners
Your Well Water, Explained.
Understand water quality, troubleshoot common well problems, and find practical solutions for a safer, more reliable home water supply.
Guidance grounded in primary sources
US EPAUSGSCDCNSF/ANSI
- 100
- Source-cited guides
- 50
- State water guides
- 6
- Free interactive tools
- Zero
- Personal data stored
Start Here
What’s wrong with your well water?
Pick the symptom you’re seeing. Each guide separates nuisance issues from potential health concerns — and never assumes water is safe based on look or smell.
- Rotten Egg SmellDependsHydrogen sulfide gas, sulfur bacteria, or a water heater anode.
- Brown or Rusty WaterAestheticUsually iron, manganese or sediment — clear vs. colored matters.
- Low Water PressureEquipmentPressure tank, pressure switch, clogging, or pump wear.
- Cloudy WaterDependsTrapped air, fine sediment, or methane — the cause changes the fix.
- Well Pump Not WorkingEquipmentPower, pressure switch, or pump failure — work safely.
- Hard WaterAestheticScale and soap scum from calcium and magnesium.
- Iron StainsAestheticReddish-brown staining on fixtures and laundry.
- Bacteria ConcernsTest firstColiform or E. coli — test before you trust clear water.
- Sediment in WaterEquipmentSand, silt or grit from the formation or failing components.
Why it matters
40 million Americans rely on a private well — and no one tests it for them.
Unlike public utilities, private wells aren’t covered by the federal Safe Drinking Water Act. That makes understanding, testing, and maintaining your water your responsibility. We make that practical.
Free Interactive Tools
Tools that do the hard part
Diagnostic and sizing tools with real calculations and clearly stated assumptions — no sign-up, no stored personal data.
Well Water Problem FinderAnswer a few questions to narrow down likely causes.Open tool Water Test Results InterpreterEnter lab results and compare to reference values.Open tool Well Pump Size CalculatorEstimate required flow and total dynamic head.Open tool Pressure Tank Size CalculatorEstimate drawdown and nominal tank capacity.Open tool Water Treatment Cost CalculatorCompare upfront, annual and 5-year treatment costs.Open tool Well Maintenance PlannerBuild a printable annual maintenance schedule.Open tool
Understand Your Water
Six ways to get on top of your well
From water quality and testing to pumps, filtration, maintenance and real-world costs.
Testing & Safety
How to test, what to test for, and how to read results.
Explore
Well Pumps
Pump types, sizing, troubleshooting and replacement.
Explore
Filtration & Treatment
Filters, softeners, UV, RO and contaminant removal.
Explore
Well Maintenance
Inspection, disinfection and seasonal upkeep.
Explore
Well Water Problems
Diagnose smells, colors, pressure and staining issues.
Explore
Cost Guides
Documented price ranges for common well projects.
ExploreWater Quality by State
Well water is local. Your guidance should be too.
Each state page summarizes documented regional conditions, the official agencies that oversee private wells, and the tests those agencies recommend — citing EPA, USGS, CDC and state sources. We don’t invent county- or ZIP-level contamination data.
Texas
Florida
Pennsylvania
North Carolina
Michigan
Maine
Popular Guides
Practical, source-cited reading
Every guide shows its last review date, author and reading time.
Problem
GuideHow to Test Well Water
Because private wells are usually not regulated like public systems, testing is the owner’s job. Here’s what to test for, how often, and how to do it right.
4 min readReviewed October 26, 2026
GuideBest Well Water Filters
The “best” well water filter is the one matched to your confirmed contaminant. This guide maps problems to filter types and the certifications to check.
3 min readReviewed October 28, 2026
GuideTypes of Well Pumps
Submersible and jet pumps dominate residential wells, and depth is the main deciding factor. Here’s how the common types differ.
3 min readReviewed October 27, 2026
GuideAnnual Well Maintenance
A short yearly routine — test, inspect the wellhead, keep records — prevents most well surprises. Build a printable schedule with our planner.
3 min readReviewed October 28, 2026
GuideWhat Drives the Cost of Drilling a Well
A plain-English breakdown of the cost drivers for drilling a new private well and how to get quotes you can trust.
2 min readReviewed October 29, 2026
Product Research
Compare treatment options by what they actually do
Documentary research organized by the contaminant or problem a product addresses — with certifications and limitations stated, and no invented lab tests or ratings.
Well Water FiltersIron FiltersSediment FiltersWater SoftenersUV Treatment SystemsPressure TanksWell PumpsWater Testing Kits
Affiliate disclosure — some product links may be affiliate links. This never changes our editorial assessment or your price.
Trust & Methodology
Why you can rely on this site
Drinking water is a health-sensitive topic. Here’s how we work — and what we deliberately don’t do.
Primary sources first
We build guidance from EPA, USGS, CDC and state agency material, and cite it on the page.
Honest about limits
We separate aesthetic issues from health concerns and never imply water is safe based on look, taste or smell.
Research, not lab testing
Our articles are documentary research. We don’t claim to run laboratories or field tests we haven’t performed.
Reviewed and dated
Each guide carries a review date, and we maintain a corrections policy for when we get something wrong.