Well water treatment starts with a lab report, not a product. Iron stains, a sulfur smell, scale and bacteria each call for different equipment, and the right system for your well is the one chosen for what the test found. Here is how to get from a test result to a treatment plan.
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Start with the test
Texas’s TCEQ, in its guide to choosing home water treatment, asks one question before any other: what contaminant do you want to remove or reduce? It also advises against buying until you have researched the actual quality of your water. On a private well, that means a lab test. If you do not have a recent one, start at well water testing.
EPA’s yearly test for a private well covers total coliform bacteria, nitrates, total dissolved solids and pH. For treatment, the pro may want more: iron, manganese, hardness, hydrogen sulfide or others, depending on what you see. EPA’s chart of reasons to test lists, for example, iron, copper and manganese for stained fixtures and laundry, and hydrogen sulfide, corrosion and metals for water with an objectionable taste or smell.
A warning from TCEQ
Some companies may make claims about the quality of your water that are false, deceptive or misleading, to sell expensive and unnecessary treatment units. Get your own certified lab result before you buy, and get estimates from a few different companies.
Match the problem to the treatment
There is no single unit that can remove all contaminants, TCEQ notes, and depending on your water you may need to combine treatment units. This table maps common well water problems to the kinds of treatment a pro may discuss. It is a starting point for that conversation, not a prescription.
| What the test or your eyes show | Kinds of treatment a pro may discuss |
|---|---|
| Iron: rusty color, reddish or orange stains | An iron filter or other filtration chosen for the iron found |
| Manganese: black or brown stains | Filtration chosen for manganese, looked at alongside iron |
| Rotten egg smell | Treatment for hydrogen sulfide once a test confirms it |
| Hardness: scale, soap that will not lather | A water softener |
| Sediment, sand or cloudiness | A sediment filter, and a check of the pump and well |
| Coliform bacteria | Finding and fixing the cause, disinfecting the well, and disinfection such as UV light or chlorination |
| Nitrates above 10 mg/L | An alternate drinking water source, or treatment such as distillation, reverse osmosis or ion exchange |
| Low pH or corrosive water | Treatment chosen for pH, and a look at what the water is doing to the plumbing |
Iron, manganese and staining
EPA sets secondary standards for these, which are non-mandatory guidelines for taste, color and odor. For iron the guideline is 0.3 mg/L, linked to a rusty color, sediment, a metallic taste and reddish or orange staining. For manganese it is 0.05 mg/L, linked to black to brown color, black staining and a bitter metallic taste. These are nuisance problems in EPA’s terms, which is why the fix is chosen against the lab figures: the amount of iron and manganese, and the pH, can shape what equipment will handle them. EPA’s chart also lists iron and manganese among the things to test for when a water softener is wanted.
Odor
For an objectionable taste or smell, EPA suggests testing for hydrogen sulfide, corrosion and metals. A rotten egg smell has its own guide: well water that smells like rotten eggs. CDC also lists a change in smell as a reason to test sooner than the yearly schedule.
Hardness
Hardness comes from calcium and magnesium. USGS grades water from soft, up to 60 mg/L as calcium carbonate, through moderately hard and hard, to very hard above 180 mg/L. EPA’s chart ties scaly residue and soap that will not lather to hardness. For hardness, the treatment is a water softener; residential softeners are covered by the standard NSF/ANSI 44. Many softeners exchange sodium for the hardness removed, which adds sodium to the water; water utilities suggest that anyone on a sodium-restricted diet consult their physician.
Got a test result and want it treated? Say what it showed and give your ZIP code.
Bacteria and nitrates
These are health results, and they come first. If a contaminant exceeds a health standard, EPA’s advice is to contact your public health department for the steps to follow and to have the well re-tested. Treatment is only part of the answer.
- Coliform bacteria. Nebraska DWEE says their presence suggests structural issues with the well or a source of contamination nearby, and that a certified well contractor should inspect the well as soon as possible. EPA says high bacteria can sometimes be controlled by adding disinfection to a well, such as chlorine, ozone or ultraviolet light. See coliform in well water and UV light for well water.
- Nitrates. If a sample shows nitrates above 10 mg/L, DWEE recommends locating an alternate drinking water source or installing in-home treatment such as distillation, reverse osmosis or ion exchange. Boiling will not remove nitrates.
EPA adds a frank caution: depending on the contaminant, its concentration and the condition of the well, treatment may not be enough, and an owner may need a new source of water or a new well.
Whole house or one tap
TCEQ describes two kinds of home treatment. Point-of-use units treat the water at one faucet or one place, such as under the kitchen sink, and suit water used for drinking and cooking. Point-of-entry units are installed on the water line and treat all the water as it enters the home: that is what a whole house well water filter is.
Problems that affect every tap, such as iron staining, hardness or sediment, are usually treated at the point of entry. A problem that only matters in drinking water may be handled at one tap. Reverse osmosis is one example: EPA WaterSense says it can potentially remove contaminants such as lead, volatile organic compounds, PFAS, arsenic, bacteria and viruses, and that a typical under-sink unit puts five gallons or more of reject water down the drain for every gallon it treats.
TCEQ adds one caution for older homes: some point-of-entry units can produce water that is slightly corrosive, and for a home built before 1988 a point-of-entry unit might not be the best option, depending on the materials in the plumbing. Ask the pro about it.
Standards to look for
TCEQ advises choosing a unit certified by NSF, Underwriter’s Laboratory or the Water Quality Association to remove the contaminant you are concerned about, and checking that the certification covers that contaminant. The NSF/ANSI standards you will see named include:
| Standard | What it covers |
|---|---|
| NSF/ANSI 42 | Aesthetic effects such as chlorine, taste and odor |
| NSF/ANSI 53 | Health effects, such as lead |
| NSF/ANSI 55 | Ultraviolet systems, Class A and Class B |
| NSF/ANSI 44 | Residential water softeners |
| NSF/ANSI 58 | Reverse osmosis drinking water systems |
After the system is in
TCEQ says to test your water after installing a unit, to make sure the treatment is working, and to follow the maker’s recommendations for cleaning and maintenance, which may include changing filters, disinfecting or backwashing. Otherwise, it warns, a unit may lose its effectiveness over time and in some cases make water quality worse. Keep testing the well every year as EPA and CDC advise, because the water coming into the treatment can change.
Questions to ask the pro
- Which result on my test is this system meant to treat?
- Will it handle everything the test found, or do I need more than one unit?
- What standard is the equipment certified to, and for which contaminant?
- Whole house or one tap, and why?
- Does my plumbing’s age matter for this system?
- What maintenance does it need, and how will we know it is working?
Send what the test showed and your ZIP code. An independent local pro can contact you.
Questions people ask
What is the best water treatment for well water?
The one chosen for what your test found. TCEQ notes that no single unit removes all contaminants, and that you may need to combine units.
How do you treat well water with bacteria?
Find and fix the cause first. EPA says high bacteria can sometimes be controlled by adding disinfection such as chlorine, ozone or UV light. Contact your health department and re-test, as EPA advises.
Do I need a whole house filter for well water?
It depends on the problem. Iron, hardness and sediment affect every tap, so they are usually treated where the water enters the house. A drinking water problem may be handled at one tap.
How often should well water be treated or the system serviced?
Follow the maker’s maintenance schedule, as TCEQ advises, and test the water after installing a unit and every year after that.
Do I need reverse osmosis with well water?
Only if the test shows something it is meant to treat. EPA WaterSense lists lead, VOCs, PFAS, arsenic, bacteria and viruses among what RO can potentially remove. Nebraska DWEE names it as one in-home option for high nitrates.
What is your well doing?