Frequently Asked Water Questions

No. The need depends on the water source, household plumbing, treatment goal, and evidence. Some homes may only need point-of-use drinking-water treatment, a water softener, source repair, or no additional equipment.

Some carbon systems are designed and certified for chlorine or chloramine reduction, but performance depends on the exact model, media, flow, capacity, and maintenance. Verify the official listing and do not assume every carbon filter has the same claim.

No. A conventional softener primarily reduces hardness through ion exchange. A whole-house filter may target sediment, taste, odor, or a specific contaminant. Some homes use both, but the stages must be ordered and sized correctly.

No. Filtration can reduce lead only when the complete system has a verified lead claim and is operated within its rating. It does not remove the lead-containing pipe. Louisville homeowners should check service-line records and use the utility replacement process when applicable.

The schedule depends on the exact cartridge, media, water conditions, flow, and rated capacity. A service plan should use model-specific intervals and measurable triggers such as pressure drop, gallons, time, or test results.

Do not assume it can. Follow the current utility and public-health advisory. A typical carbon or sediment system is not a substitute for boiling, and any microbiological claim must be verified for the exact complete system and conditions.

Not for every home. Louisville Water reports that its public water meets applicable standards. RO is a household choice for a specific drinking-water goal, and the decision should be based on current utility information, property plumbing, and the exact reduction claim desired.

Some RO systems are certified for specific PFAS reduction claims. Verify the exact model, contaminant claim, capacity, replacement parts, and rated conditions. Do not assume every membrane or every RO brand has the same performance.

Some listed RO systems reduce lead at the connected tap. RO does not remove a lead service line or protect other faucets. Louisville homeowners should check service-line records and pursue source replacement when lead-containing material is verified.

All conventional RO systems produce a concentrate stream, but the ratio varies by model, pressure, temperature, membrane, and operating design. Compare published efficiency or recovery data under stated conditions rather than relying on one universal ratio.

It is optional. Remineralization may change taste or add selected minerals, but it should not be marketed as a medical treatment. Verify the media, materials, replacement schedule, and any measurable claim.

Follow the exact model instructions and performance indicators. Prefilters and postfilters are often serviced more frequently than the membrane, but water quality, use, pressure, and capacity affect the schedule.

Need is a household decision, not a citywide conclusion. Test the property and define the goal. A homeowner who sees scale or soap inefficiency may value softening, while another household may decide the maintenance and salt use are not necessary.

A conventional softener is designed mainly for hardness. Do not assume it removes chlorine, lead, PFAS, microorganisms, or every dissolved contaminant. Those goals require separate verified treatment claims.

Size from measured hardness, water use, peak flow, usable capacity at the selected salt dose, and expected regeneration frequency. Tank size or marketing grain capacity alone is not enough.

Salt use depends on hardness, water demand, resin capacity, programmed dose, reserve, efficiency, and regeneration frequency. A proposal should estimate annual use from stated assumptions rather than promise one universal amount.

Usually not. Many salt-free devices are scale-control systems and do not remove calcium and magnesium or produce a lower hardness test result. Verify the exact claim and choose it only when that result matches the goal.

Many households do, but ion exchange adds sodium or potassium in proportion to the removed hardness. Anyone with a medically directed restriction should discuss the choice with a qualified health professional and consider a separate drinking-water configuration.

No. Public-water customers should begin with the current utility report and property records. Laboratory testing is useful when the question is property-specific, involves a private well, concerns a named contaminant, or verifies treatment performance.

A test strip can screen selected parameters, but it cannot establish overall safety. The result depends on the strip, range, timing, lighting, interferences, and user technique. Health-related decisions should use an appropriate laboratory method.

Louisville Water currently provides a lead test-kit process and service-line resources. Follow the current utility instructions or use a qualified laboratory when the question requires a different sampling plan.

Often both. A raw sample identifies the incoming condition, and a treated sample evaluates performance. The correct design depends on the goal, and the samples should be comparable.

Routine priorities commonly include bacteria and nitrate, with additional analytes based on the well, property risks, events, and history. Use current state, county, and laboratory guidance rather than a universal panel.

Use the contaminant risk, treatment technology, manufacturer instructions, capacity, prior results, source changes, and service events. Retest after relevant repairs, flooding, breakthrough indicators, or major plumbing changes.

Use the exact cartridge capacity, elapsed time, pressure drop, water conditions, and manufacturer instructions. A universal six-month or annual interval may be wrong for a specific system.

Physical fit does not prove equivalent performance. The substitute may have different media, flow, micron rating, capacity, or contaminant claims. Use the listed replacement element when the certified claim matters.

Common causes include a loaded or undersized cartridge, excessive micron restriction, closed valve, fouled media, plumbing issue, or multiple stages with high combined pressure drop. Measure pressure before and after stages before diagnosing.

Review production, pressure, concentrate flow, membrane age, and conductivity rejection under comparable conditions. A laboratory test may be needed when the system is used for a specific contaminant claim.

Possible causes include incorrect hardness or capacity settings, meter or valve problems, leaks, high water use, frequent manual regenerations, or a brine-system issue. The exact model should be inspected rather than reset blindly.

Testing is appropriate when maintenance affects a health-related claim, a private-well safety decision, a treatment breakthrough, or a major repair. The sample plan should match the contaminant and treatment stage.

No. A certified filter may reduce lead at the connected outlet, but the lead-containing pipe remains. Louisville homeowners should use the utility inventory and replacement pathway when the service line is lead or galvanized.

No. NSF/ANSI 53 includes multiple contaminant claims. Verify that the official listing for the exact complete model specifically includes lead reduction and names the approved replacement element.

Testing before treatment can define the incoming condition. A treated sample can help evaluate performance when collected under a comparable plan. The correct design depends on whether the goal is screening, exposure reduction, troubleshooting, or formal verification.

Follow the exact model instructions, rated capacity, gallon or time trigger, water conditions, and any performance indicator. A universal replacement interval is not reliable.

Follow Louisville Water's current identification instructions. Do not treat an unknown record as proof that the line is lead or proof that it is lead-free.