Well water problems, diagnosed before you spend a dollar on equipment.
Identify your water parameters and find the right treatment system without dealer markups.
- Iron
- 1.2 mg/L
- High
- guideline 0.3 mg/L
- Hardness
- 14 gpg
- High
- treat above 7 gpg
- Coliform
- Not tested
- Test it
- annual test recommended
Symptom and Treatment Matrix
A fast lookup for common well water symptoms, the most likely cause, and the sizing fix that addresses it.
Affiliate disclosure: As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Recommendations follow water chemistry and sizing, not commission. Full Disclosure.
| Water Symptom | Primary Cause | Recommended Sizing Fix |
|---|---|---|
| Rotten egg smell (both hot and cold) | Hydrogen sulfide gas (H2S) | Air injection oxidation filter |
| Orange or brown staining on sinks | Ferrous or ferric iron (Fe > 0.3 PPM) | Dedicated iron filter or softener |
| White crust on fixtures and water heaters | Calcium and magnesium hardness (>7 GPG) | Salt-based ion exchange softener |
| Black, slimy build-up in tanks | Manganese or iron bacteria | Chlorine shock and UV or sub-micron filtration |
Rotten egg smell (both hot and cold)
Primary causeHydrogen sulfide gas (H2S)
Recommended fixAir injection oxidation filter
Orange or brown staining on sinks
Primary causeFerrous or ferric iron (Fe > 0.3 PPM)
Recommended fixDedicated iron filter or softener
White crust on fixtures and water heaters
Primary causeCalcium and magnesium hardness (>7 GPG)
Recommended fixSalt-based ion exchange softener
Black, slimy build-up in tanks
Primary causeManganese or iron bacteria
Recommended fixChlorine shock and UV or sub-micron filtration
Well Water Testing and Baseline Filtration Guides
Essential guides covering private well testing protocols, water pressure basics, and baseline system setup.
Well Water Filtration Systems: The Complete Guide
A data-driven, plain-English guide to how filtration actually works: no brand pitches, just what fixes what.
Read the guideWell Water Maintenance Checklist
The small, scheduled checks that prevent the 6 a.m. emergency calls: a real maintenance schedule, not a sales brochure.
Read the guideHow to Test Well Water (And Where to Do It)
Nobody tests your well but you. Here's what to test for, how often, and where to actually send the sample.
Read the guideTroubleshoot Well Water Problems: Odors, Stains, and Sediment
Smell, stain, or symptom-first guides for pinpointing exactly what’s in your water.
Well Water Smells Like Sulfur: Causes and Solutions
If both hot and cold smell like rotten eggs, that's hydrogen sulfide from your well, and the fix depends on concentration.
Read the guideIron in Well Water: Signs, Testing, Removal
The most common contaminant in well water. Orange stains and metallic taste: here's how to confirm it's iron and fix it.
Read the guideColiform Bacteria in Well Water
The one test result that demands immediate action, not a scheduled follow-up. What a positive result actually means.
Read the guideWell Water Filtration Systems and Equipment Sizing
Filters, softeners, and treatment systems explained, plus real cost breakdowns.
Water Softeners for Well Water Explained
Well water isn't city water with a different label. Why a softener sized for municipal supply fails on a well.
Read the guideWell Water Filtration System Cost Breakdown
Every line item that goes into a real quote, broken down so you can tell a fair price from a markup.
Read the guideBest Iron Filters for Well Water
The most common iron issue in well water. Identify which type you have first: the wrong media makes the problem worse.
Read the guideWell Water Softener and Filter Brand Reviews
Research-based breakdowns of specific systems: specs, sizing fit, and who each one is for.
SpringWell vs Aquasana: Which Is Better for Well Water?
These aren't interchangeable options for the same job. What each system is actually engineered to remove.
Read the guideSpringWell WS1 Review
An independent, data-driven review of this system: what it does well, where it falls short.
Read the guideWhy Trust Well Water Advisor
Real data-driven diagnostics behind every recommendation, not generated fluff.
Data-Driven Water Diagnostics
Every core guide is built on lab parameters and flow-rate sizing math, not guesswork or generic templates.
Standardized Methodology
Every guide reflects EPA and NSF benchmark standards and standardized flow-rate calculations, not spec sheets rewritten from a manufacturer’s site.
No Pay-to-Play Placement
Reviews reflect independent testing criteria, not what pays the best commission.
Frequently Asked Questions
Answers to common questions regarding private well testing, iron filter sizing, water softener setup, and well pump diagnostics.
How is well water different from city (municipal) water?
Well water is untreated and untested by any utility, so contaminants like iron, bacteria, and pH problems go unmanaged unless the homeowner tests and treats it directly. City water, by contrast, is treated and tested continuously by law. That means well water needs its own testing schedule and equipment sized specifically for it, not gear built for municipal supply.
How often should I test my well water?
At minimum, once a year for bacteria and nitrates, and any time you notice a change in taste, smell, or color. If you’re buying or selling a home, a full panel test is standard. See our well water testing guide for what to test for and where to send samples.
Do I need a whole-house filter, or just a point-of-use filter?
Whole-house filters protect all plumbing and every tap from contaminants like iron and scale, while point-of-use filters like under-sink RO only treat drinking water at one faucet. Whole-house systems cost more but address staining, scale, and corrosion throughout the home, while point-of-use filters are cheaper but narrower in scope. Our filtration systems guide breaks down when each makes sense.
Why does my water smell like rotten eggs?
If only the hot water smells, it’s almost always your water heater’s anode rod reacting with sulfur bacteria inside the tank, not your well. If both hot and cold smell, that’s hydrogen sulfide gas coming from the well itself. The fix is different in each case: see our hot water and sulfur smell guides.
How much does a well water filtration system actually cost?
Well water filtration costs range from a few hundred dollars for basic sediment and carbon setups to several thousand for full iron, manganese, and softening systems with whole-house RO. Our cost breakdown guide itemizes every component so you can sanity-check a quote.
Is the water calculator actually free?
Yes, the Well Water Diagnostic Calculator is completely free to use with no signup required, and it estimates your likely water problem and system size in minutes. It’s a starting point for research, not a replacement for a certified water test.
Browse by Topic
Every guide on the site, organized into hubs. Browse every guide by topic.
Core Guides
Filtration, treatment, testing and maintenance basics.
4 guidesSymptoms and Problems
Smells, stains, slime, and sediment: diagnosed.
3 guidesContaminants
Iron, manganese, coliform bacteria.
10 guidesSystems and Equipment
Softeners, filters, RO, neutralizers and costs.
1 guideReviews
Research-based equipment reviews.
1 guideComparisons
Brand-vs-brand, head to head.
Start with your symptoms, not a shopping list.
Run the free diagnostic calculator and find out what your water actually needs, before you buy anything.
Run the Free Water CalculatorSizing is calculated from water chemistry and flow rate math. Some links earn us a commission, which never changes the recommendation.