Tap water · KY
Louisville Water Company
EPA system ID KY0560258 · serves about 806,997 people. Every US utility must publish an annual water quality report — here’s the official one (2025), and below it, our plain-English translation.
Read the official report →What Louisville Water Company found in 2025
28 detected analytes from the utility’s own annual report, hand-normalized — nothing was near or over a federal health-based limit.
| Detected | Level | Limit | % of limit | Status |
|---|---|---|---|---|
| Chlorine Residual (Chloramines) | 2.69 ppm | 4 ppm | 67% | Within limit |
| PFOA (highest of multiple sources) | 1.9 ppt | 4 ppt | 48% | Within limit |
| Total Trihalomethanes | 30.3 ppb | 80 ppb | 38% | Within limit |
| Haloacetic Acids | 22.4 ppb | 60 ppb | 37% | Within limit |
| Combined Radium (pCi/L) | 1.21 pCi/L | 5 pCi/L | 24% | Within limit |
| Chlorite | 0.2 ppm | 1 ppm | 20% | Within limit |
| Fluoride (highest of multiple sources) | 0.69 ppm | 4 ppm | 17% | Within limit |
| Nitrate (highest of multiple sources) | 0.96 ppm | 10 ppm | 10% | Within limit |
| Lead (90th percentile) (highest of multiple sources) | 1.1 ppb | 15 ppb | 7% | Within limit |
| Copper (90th percentile) (highest of multiple sources) | 0.041 ppm | 1.3 ppm | 3% | Within limit |
| Chromium, Total | 1.9 ppb | 100 ppb | 2% | Within limit |
| Nitrite | 0.014 ppm | 1 ppm | 1% | Within limit |
| Barium (highest of multiple sources) | 0.021 ppm | 2 ppm | 1% | Within limit |
| PFBS, PFHxS, PFNA and HFPO-DA (GenX) (highest of multiple sources) | 0 Hazard Index | 1 Hazard Index | 0% | Within limit |
| PFOS (highest of multiple sources) | 0 ppt | 4 ppt | 0% | Within limit |
| PFHxS (highest of multiple sources) | 0 ppt | 10 ppt | 0% | Within limit |
| PFNA (highest of multiple sources) | 0 ppt | 10 ppt | 0% | Within limit |
| HFPO-DA (GenX) (highest of multiple sources) | 0 ppt | 10 ppt | 0% | Within limit |
| Total Dissolved Solids | 225 ppm | — | — | No federal limit |
| Hardness (as CaCO3) | 128 ppm | — | — | No federal limit |
| Alkalinity (as CaCO3) | 76 ppm | — | — | No federal limit |
| Sulfate | 56 ppm | — | — | No federal limit |
| Chloride | 33 ppm | — | — | No federal limit |
| Calcium (as Ca) | 31 ppm | — | — | No federal limit |
| Sodium (as Na) | 26 ppm | — | — | No federal limit |
| Magnesium (as Mg) | 13 ppm | — | — | No federal limit |
| pH | 8.6 SU | — | — | No federal limit |
| Hardness (as CaCO3) (average of concentrations) | 7.5 grains per gallon | — | — | No federal limit |
Levels and limits are as printed in the utility’s report (“limit” is the EPA MCL, action level, residual limit, or secondary guideline that applies to that row; “ND” = not detected). Utilities publish these reports annually — we re-check every covered utility each July, after the federal publication deadline. Detected doesn’t mean dangerous — most detections sit far below their limits. This is education, not medical advice.
Your tap, if it were a bottle
How Louisville Water Company water stacks up against the bottled aisle
Same minerals, same units — the tap values below come from the utility’s report, placed next to the closest match in our bottled-water database.
| Mineral | Your tap | Closest bottled match |
|---|---|---|
| Total dissolved solids | 225 mg/L | Fiji at 230 mg/L |
| Calcium | 31 mg/L | Acqua Panna at 32.2 mg/L |
| Magnesium | 13 mg/L | Fiji at 14 mg/L |
| Sodium | 26 mg/L | Buxton at 24 mg/L |
| Sulfate | 56 mg/L | Vichy Catalan at 48 mg/L |
| Chloride | 33 mg/L | Pedras Salgadas at 30 mg/L |
Tap values are the headline levels from the utility’s annual report (often a highest or average figure); bottled values are label- or report-derived. A closest match is a numeric comparison, not an equivalence or an endorsement.
Zip codes covered
40023 · 40041 · 40059 · 40118 · 40202 · 40203 · 40204 · 40205 · 40206 · 40207 · 40208 · 40209 · 40210 · 40211 · 40212 · 40213 · 40214 · 40215 · 40216 · 40217 · 40218 · 40219 · 40220 · 40222 · 40223 · 40228 · 40229 · 40241 · 40242 · 40243 · 40245 · 40258 · 40272 · 40291 · 40299
Boundary zips partially served by other systems are deliberately unlisted — check your exact zip.