We read 17 results from Louisville Water Company’s 2025 water quality report. No results over a legal limit; 4 above a health goal or guideline.
Serves about 764,769 people · Water system ID KY0560258 · Read the district’s 2025 report (opens in a new tab)
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Results from the 2025 report
Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.
| Contaminant | Result | Health goal | Legal limit | What it means |
|---|---|---|---|---|
| Chloriteaverage · range 0.06 to 0.29 · Distribution system · 2025 report, page 5 | 0.2 ppm | 0.05 ppm | 1 ppm | Above the health goal4x the health goal |
| Lead90th percentile of 50 homes tested, 0 over the action level · sampled 2023 · Customer taps (50 homes) · 2025 report, page 6 | 1.1 ppb | 0.2 ppb | 15 ppb (action level) | Above the health goal5.5x the health goal |
| PFOA (a PFAS)average · Crescent Hill plant, highest of 2 sources · 2025 report, page 7 | 1.9 ppt | 0.007 ppt | 4 ppt from 2029 | Above the health goal271x the health goal |
| pHaverage · Both plants (average) · 2025 report, page 6 | 8.6 | — | — | Outside the normal rangeAlkaline water can leave scale |
| Chloraminehighest running annual average · range 1.97 to 3.46 · Distribution system · 2025 report, page 5 | 2.69 ppm | None set | 4 ppm | Below the legal limit |
| Chlorideaverage · Both plants (average) · 2025 report, page 6 | 33 ppm | — | 250 ppm guideline | Within the guideline |
| Copper90th percentile of 50 homes tested, 0 over the action level · sampled 2023 · Customer taps (50 homes) · 2025 report, page 6 | 0.04 ppm | 0.3 ppm | 1.3 ppm (action level) | Below the health goal |
| Disinfection byproducts (HAA5)highest running annual average · range 4.6 to 27.7 · Distribution system · 2025 report, page 5 | 22.4 ppb | None set | 60 ppb | Below the legal limit |
| Disinfection byproducts (TTHM)highest running annual average · range 11.6 to 29.6 · Distribution system · 2025 report, page 5 | 30.3 ppb | None set | 80 ppb | Below the legal limit |
| PFHxS (a PFAS)average · Both plants · 2025 report, page 7 | Not detected | None set | 10 ppt from 2029 | Not detected |
| PFNA (a PFAS)average · Both plants · 2025 report, page 7 | Not detected | None set | 10 ppt from 2029 | Not detected |
| PFOS (a PFAS)average · Crescent Hill plant, highest of 2 sources · 2025 report, page 7 | Not detected | 1 ppt | 4 ppt from 2029 | Not detected |
| Sulfateaverage · Both plants (average) · 2025 report, page 6 | 56 ppm | — | 250 ppm guideline | Within the guideline |
| Total dissolved solidsaverage · Both plants (average) · 2025 report, page 6 | 225 ppm | — | 500 ppm guideline | Within the guideline |
| Alkalinityaverage · Both plants (average) · 2025 report, page 6 | 76 ppm | None set | None | No health limit |
| Hardnessaverage · Both plants (average) · 2025 report, page 6 | 7.49 gpg (128 ppm) | — | — | Hard |
| Sodiumaverage · Both plants (average) · 2025 report, page 6 | 26 ppm | None set | None | No health limit |
Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper.
EPA testing for PFAS and lithium
EPA’s own nationwide testing (UCMR 5) found these in Louisville Water Company’s water between Feb 2023 and Nov 2023. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.
- PFOA7.5 pptFound in 1 of 6 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
- PFBS3 pptFound in 1 of 6 samples · highest resultNo federal limit in force for this one
Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.
What you can do
Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.
Lead
Found: Lead
What removes it: Certified carbon block or RO.
PFAS ("forever chemicals")
Found: PFOA (a PFAS), PFOA (EPA testing)
What removes it: Reverse osmosis.
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