Shower filters for well water

Why well water is a different problem

City water comes from a regulated system. A private well does not. The CDC puts it directly: “EPA’s rules that protect public drinking water systems do not apply to privately owned wells.” The EPA says the same from the other side: “Private well owners are responsible for delivering safe drinking water to their households.”

So on a well, you are the water utility. That changes the question from “which shower filter?” to “what is actually in my water?”

What a shower filter is certified to do

The one certification written for shower filters, NSF/ANSI 177, covers reduction of free available chlorine. What it tests is covered here. Chlorine is in city water because the utility adds it to disinfect. Unless something on your system adds chlorine, a certified shower filter may have nothing to do on a well.

That is not a knock on the filters. It is a mismatch between what they are certified for and what well owners usually need to know.

What the CDC says to test for

The CDC’s guidance is specific: “Test your well water at least once each year for total coliform bacteria, nitrates, total dissolved solids, and pH levels.” It recommends a state-certified laboratory.

It also lists times to test again: after flooding or repairs to the well, when the water’s taste, color or smell changes, and when someone in the home is pregnant or a child is moving in. None of those tests is something a shower filter answers.

Stains, sediment and the EPA’s secondary standards

The problems well owners notice in the bathroom are often cosmetic ones the EPA covers in its secondary standards, which it describes as guidance and says “EPA does not enforce”. For iron, the guidance level is 0.3 mg/L, and the effects the EPA lists are “rusty color; sediment; metallic taste; reddish or orange staining”. Manganese is listed at 0.05 mg/L, and total dissolved solids at 500 mg/L.

No shower filter we cover publishes a certified claim for iron or manganese. If your test shows them, treating the water where it enters the house is the job, and a water treatment professional with your results in hand is the person to size it.

Hardness

If the test shows hard water — white crust, poor lather — that is a softener question, not a filter one. The difference is explained here, and if a softener is not on the cards, some heads cope better than others.

So should you buy one?

Buy a certified filter if your results or your treatment system show chlorine in the water. The Aquasana and Culligan are both certified for it.

Buy a better head if the problem is a shower that clogs.

Buy nothing yet if you have not tested the well. The test is the purchase that tells you what to buy next.

If you rent a home on a well

Ask the owner for the most recent test results; the EPA puts that responsibility on the well owner. Every product here rates Safe on our install rating: each screws onto the existing shower arm.