Most water quality problems do not announce themselves with obvious symptoms. Lead, nitrates, arsenic, and PFAS are all colorless, odorless, and tasteless at levels commonly found in tap water. But there are visible and detectable signs that something in your water supply warrants attention — and that a filter may be the right solution. Here are seven signs to watch for.
1. Your Water Smells or Tastes of Chlorine
A noticeable chlorine smell or taste — similar to a swimming pool — indicates your municipal water supplier is maintaining high chlorine residuals in the distribution system. This is standard practice and the water is technically safe, but the smell and taste affect how much water you and your family drink.
More concerning are the disinfection byproducts (DBPs) that form when chlorine reacts with naturally occurring organic matter — trihalomethanes and haloacetic acids, which are regulated but present in most chlorinated supplies. An activated carbon filter removes chlorine and significantly reduces DBPs. This is one of the easiest water quality improvements to make and one of the most impactful for daily drinking.
2. White or Chalky Buildup on Fixtures and Appliances
If you see white or off-white crusty deposits around faucets, on showerheads, inside your kettle, or on the glass shower door, your water is hard. This limescale is calcium and magnesium carbonate that precipitates out of water when it evaporates or is heated.
Hardness above 7 grains per gallon (GPG) causes visible scale buildup and will progressively damage your water heater, dishwasher, washing machine, and plumbing. A water softener resolves this completely. A water conditioner (salt-free system) reduces new scale formation but does not eliminate it.
3. Your Skin Feels Dry and Itchy After Showering
When hard water reacts with soap, it forms a sticky residue of calcium soap salts that coats skin rather than rinsing away cleanly. If you consistently feel dry, tight, or itchy after showering despite using moisturizer, hard water is a likely contributor.
People with eczema, psoriasis, or sensitive skin are particularly affected. Studies have found that children in hard water areas have significantly higher rates of eczema. If a water softener is not feasible, a vitamin C shower filter can help with chlorine-related dryness, though it will not resolve hardness issues.
4. Your Hair Looks Dull and Feels Rough
Mineral deposits from hard water accumulate on hair shafts, coating the cuticle and preventing light from reflecting evenly. Hair in hard water areas looks dull, feels rough, and is prone to breakage and tangling. For color-treated hair, hard water accelerates fading and can cause uneven tones.
If your hair changed noticeably after moving to a new home or city, the water hardness difference is often the cause.
5. You See Orange or Brown Staining
Orange or brown staining on sinks, toilets, bathtubs, and laundry points to iron in your water. Well water commonly contains iron, and city water in older distribution systems can also pick up iron from corroding pipes. Iron staining is difficult to remove once established and worsens over time.
Iron at low levels (below 0.3 mg/L) is not a health risk, but it causes serious aesthetic and practical problems. An iron filter or a water softener with fine mesh resin (for dissolved iron below 5-8 ppm) resolves this. Higher iron concentrations require a dedicated oxidizing iron filter.
6. You Have Old Plumbing or Live in an Older Home
This is arguably the most important sign. Homes built before 1986 may have lead pipes, lead solder in plumbing joints, or brass fixtures containing lead. Lead does not come from the treatment plant — it leaches into water from household plumbing, especially in acidic water or water that sits in pipes for extended periods.
There is no safe level of lead exposure, particularly for children and pregnant women. If your home has pre-1986 plumbing and you have never tested for lead, do so immediately. A certified NSF/ANSI Standard 53 filter or reverse osmosis system at the drinking tap will reduce lead effectively while you assess your plumbing options.
7. You Use a Private Well
Private wells are not regulated by the EPA or tested by any government agency. You are entirely responsible for testing and treating your well water. Contaminants common in well water — including coliform bacteria, nitrates, arsenic, iron, manganese, and radon — vary significantly by geography and geology and can change seasonally based on rainfall and agricultural activity.
The CDC recommends testing well water at least annually for bacteria, nitrates, and pH. If you have never had your well tested, or if you have not tested recently after nearby land use changes, flooding, or drought, schedule a certified lab test. Treatment requirements depend entirely on what the test finds.
What to Do Next
If you recognized one or more of these signs, the first step is always to test your water — not to buy a filter immediately. A certified lab test identifies exactly what is in your water, which tells you precisely which filter technology you need. Buying a filter without testing is guesswork that may address the wrong problem entirely.
Your annual Consumer Confidence Report from your municipal utility is a free starting point. For well water or older homes, order a certified lab test to get accurate, actionable results.
Bottom Line
Chlorine smell, scale buildup, dry skin, dull hair, iron staining, old plumbing, and private wells are the clearest indicators that your water quality deserves attention. Any one of these warrants at minimum a water test and a serious look at your filtration options.
Disclaimer: Water quality varies by location. Test your water before purchasing filtration equipment to ensure you address the right contaminants.