TapMatch

Louisville, Kentucky

Louisville Water 2025 Annual Water Quality Report. Crescent Hill treats Ohio River water; B.E. Payne treats riverbank-filtered groundwater. Residual disinfectant is chloramines. The additional-data table prints hardness 128 ppm / 7.5 grains as an average of those two finished waters — not two plant columns. No Measure S-style residential softener ban turned up.

Cited chemistry for LouisvilleA chart of numbers printed on the utility report, each labeled with its unit. Missing numbers are left off.Hardness (two-plant average)128 ppm / 7.5 gpgChloramines2.69 ppm RAA (range 1.97–3.46)TTHMs30.3 ppb max LRAAHAA522.4 ppb max LRAAWQR
Cited numbers from the utility report. Length follows the printed value against a labeled scale — not a health ranking. If the report has no number, it is not on the chart.
  1. Hardness (two-plant average)128 ppm / 7.5 gpg
  2. Chloramines2.69 ppm RAA (range 1.97–3.46)
  3. TTHMs30.3 ppb max LRAA
  4. HAA522.4 ppb max LRAA

Best match for Louisville

Salt-based water softener

No district prohibition on a brine drain turned up in the current file.

Two tall mineral tanks and a black brine tank of a salt-based water softener, plumbed with copper pipe in a garage.
Salt-based softener: two mineral tanks and a brine tank.

A salt-based softener is the thing that actually removes hardness. Size it from your grains and how much water you use, not bathroom count. It needs a drain.

Shop salt-based softeners

Some links are affiliate links. If you buy through one, we may earn a commission. That does not change the match, and it is not a medical claim.

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Other options that still fit

  • Salt-free conditioner

    A salt-free conditioner changes how scale sticks. It does not soften. Soap and spots stay closer to untreated. No brine line.

    Shop salt-free conditioners

  • Whole-house catalytic carbon for chloramine

    Catalytic carbon with a chloramine claim (NSF/ANSI 42 for chloramine). Regular chlorine carbon is the wrong box.

    Shop catalytic carbon for chloramine

  • Under-sink reverse osmosis

    The under-sink RO we actually run is Cloud RO — NSF/ANSI 58, kitchen tap, not a whole-house tank. Check the exact listing if PFAS is why you are shopping. Shop Amazon first for under-sink RO, or buy Cloud direct. Waterdrop is a tankless option if you want that path. A certifier-listed pitcher is the cheap first step. Nobody is paying for a medical claim.

    Shop under-sink reverse osmosisBuy Cloud RO directShop Waterdrop reverse osmosisShop PFAS-listed pitchers

  • Test the tap first

    A homeowner kit is a start. It is not a state-certified lab. Use a certified lab when the decision is expensive.

    Shop water test kits

On the report

Water utility
Louisville Water Company
Hardness
128 ppm as CaCO3 / 7.5 grains per gallon on the 2025 additional-data table. The footnote says those are an average of the concentrations in Crescent Hill and B.E. Payne finished water. Separate plant hardness columns are not printed on that table. — Louisville Water Company 2025 Annual Water Quality Report
Disinfectant
Chlorine residual (chloramines) 2.69 ppm RAA (range 1.97–3.46), MRDL 4. Distribution-system table, 2025 report. — Louisville Water Company 2025 Annual Water Quality Report
Brine / salt to the sewer
No district prohibition found in current research. No Louisville Water or MSD residential softener ban like LACSD Measure S turned up. Ask the sewer agency on the bill before you cut a brine drain.

Also around here

Extra context besides the utility report and the chart above — geology, an unregulated table, or a published study. Not a second set of printed tap numbers.

  • MicroplasticsWHO’s 2019 review examined studies that found microplastic particles in treated tap and bottled water in many places. That is a published-occurrence finding, not a number from this city’s water-quality report, and we do not invent a particles-per-liter count for the tap.Microplastics in drinking-water — World Health Organization
  • Other 2025 additional-data numbersThe same footnote says these additional-data rows are an average of Crescent Hill and B.E. Payne finished water.Alkalinity 76 ppm as CaCO3. Sodium 26 ppm. Chloride 33 ppm. Sulfate 56 ppm. TDS 225 ppm. Lead 90th percentile 4.2 ppb (0 of 50 above AL 15, 2023 sampling). Copper 90th 0.081 ppm (0 of 50 above AL 1.3).2025 Annual Water Quality Report — Louisville Water Company

Louisville drinking water is treated at the Crescent Hill Water Treatment Plant (Ohio River) and the B.E. Payne Water Treatment Plant (riverbank-filtered groundwater) and delivered by Louisville Water Company. No Louisville Water or Metropolitan Sewer District residential softener ban like LACSD Measure S turned up. Ask the sewer agency on the bill before you cut a brine drain. This is not a legal opinion.

The 2025 Annual Water Quality Report additional-data table prints hardness 128 ppm as CaCO3 / 7.5 grains per gallon. The footnote says those figures are an average of Crescent Hill and B.E. Payne finished water. Separate plant hardness columns are not on that table. This file does not invent them.

Chlorine residual (chloramines) 2.69 ppm running annual average (range 1.97–3.46). TTHMs 30.3 ppb maximum locational running annual average (range printed 11.6–29.6). HAA5 22.4 ppb maximum LRAA (range 4.6–27.7). Kitchen shopping stays the Cloud RO / Waterdrop path already used on other cities if a listing is why you are looking.

Sources

  1. 2025 Annual Water Quality Report — Louisville Water Company. Accessed 2026-09-09.

Updated September 9, 2026. A city file is chemistry we can cite plus the sewer rule. No invented detections.