Water problems

Scale, spotting and soap that won't lather point to hardness. USGS classifies water at 121–180 mg/L as calcium carbonate as hard and above 180 mg/L as very hard. Hardness is the one problem a softener is specifically designed for, and NSF/ANSI 44 is the standard covering residential cation exchange softeners.

A chlorine or swimming-pool taste is typically a disinfectant residual from a municipal system. That is an aesthetic issue, and NSF/ANSI 42 is the standard that covers chlorine, taste, odor and particulate reduction. A carbon filter — whole-house or a single under-sink unit at $170–$580 installed — is the usual answer, not a softener.

Rusty, orange or black staining and a metallic taste generally point toward iron or manganese. NSF/ANSI 42 also covers iron and manganese reduction claims. A rotten-egg smell is commonly associated with hydrogen sulfide, and is far more common on private wells. Cloudy water is often just entrained air that clears from the bottom of the glass up; if it doesn't clear, it points to sediment or turbidity.

Two things deserve a straight warning. First, we cannot tell you what is in your water, and neither can anyone who has not tested it. Second, a sudden change — new taste, new color, new smell — is a reason to test now, not to buy equipment now. The EPA specifically advises private well owners to test immediately when water quality or ground conditions change. If a well test shows total coliform bacteria, that is a call to your local health department, not a shopping trip.

How to choose

Write down the symptom precisely before you call anyone

Hot water only, or cold too? All fixtures or one? Constant or intermittent? Hot-water-only sulfur smell often points at the water heater's anode rod rather than the supply.

Test before you treat

EPA recommends annual private-well testing for total coliform bacteria, nitrates, total dissolved solids and pH, through a state-certified lab. Your health department may do it free.

Match the standard to the symptom

Taste and odor is NSF/ANSI 42. Health-related contaminant reduction is NSF/ANSI 53. Dissolved solids is NSF/ANSI 58 reverse osmosis. Microorganisms is NSF/ANSI 55 UV. Ask for the certified claim.

Treat bacteria as urgent, not as an upsell

A positive coliform result on a well needs your local health department involved. Do not let it become a same-day sales conversation about a whole-house package.

Fix the pressure problem, don't route around it

Low pressure after a filter is usually a clogged cartridge or an undersized unit. Adding a booster pump on top of a clogged filter is treating a symptom.