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Tap water quality report

Louisville Water Company

EPA monitoring tested this supplier for 105 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

105
contaminants tested
17
detected
806,997
people served
38
health-based violations
Kentucky rankingsLead in KentuckyPFAS in Kentucky
Water source
Surface water
Ownership
Private
Counties served
Jefferson

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

38
health-based violations
458
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1998-06-22 → 1998-07-21
MCL Health-based Resolved 1998-06-22 → 1998-07-21
MCL Health-based Resolved 1998-06-22 → 1998-07-21
MCL Health-based Resolved 1998-06-22 → 1998-07-21
MCL Health-based Resolved 1998-06-22 → 1998-07-21
MCL Health-based Resolved 1998-06-22 → 1998-07-21
MCL Health-based Resolved 1998-06-22 → 1998-07-21
MCL Health-based Resolved 1998-06-22 → 1998-07-21
MCL Health-based Resolved 1997-05-01 → 1997-05-31
MCL Health-based Resolved 1997-05-01 → 1997-05-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfhxa 0.0036 µg/L 2/6 2023
Pfpea 0.0041 µg/L 2/6 2023
PFBS 0.0030 µg/L 1/6 2023
PFOA 0.0075 µg/L 1/6 2023

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
TTHM
38.7 µg/L 48%
of the EPA limit 80 µg/L
worst single sample: 46.2 µg/L
385/385 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
30.06 µg/L 50%
of the EPA limit 60 µg/L
worst single sample: 68 µg/L
385/385 SYR4 2012–2019
Nitrate
1350 µg/L 14%
of the EPA limit 10000 µg/L
worst single sample: 1600 µg/L
116/120 SYR4 2012–2019
Chlorite
501 µg/L 50%
of the EPA limit 1000 µg/L
worst single sample: 570 µg/L
60/60 SYR4 2015–2019
Nitrate-Nitrite
1330 µg/L 13%
of the EPA limit 10000 µg/L
worst single sample: 1600 µg/L
58/60 SYR4 2012–2019
Fluoride
1000 µg/L 25%
of the EPA limit 4000 µg/L
 44/44 SYR4 2012–2019
Copper
109.5 µg/L 8.4%
of the EPA limit 1300 µg/L
worst single sample: 132 µg/L
35/130 SYR4 2012–2019
Lead
12.465 µg/L 83%
of the EPA limit 15 µg/L
worst single sample: 13.5 µg/L
24/100 SYR4 2014–2017
Lead
0.0011 mg/L 7.3%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2023
Combined Radium (-226 And -228)
1.64 pCi/L 33%
of the EPA limit 5 pCi/L
worst single sample: 1.7 pCi/L
5/16 SYR4 2012–2019
2,4-D
0.3000 µg/L 0.4%
of the EPA limit 70 µg/L
 1/59 SYR4 2012–2019
Atrazine
0.2400 µg/L 8%
of the EPA limit 3 µg/L
 1/59 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
3.4 pCi/L 23%
of the EPA limit 15 pCi/L
 1/16 SYR4 2012–2019
88 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
BRUCE, SPENCER
Phone
502-271-8873
Email
[email protected]

Frequently asked questions about Louisville Water Company

Is Louisville Water Company tap water safe to drink?

EPA monitoring detected 17 contaminants in Louisville Water Company's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Louisville Water Company's water?

EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Nitrate, Chlorite, Nitrate-Nitrite, and others. The full list with the level and data source for each is above.

How many people does Louisville Water Company serve?

Louisville Water Company reports serving 806,997 people in Kentucky, per its EPA record.

Has Louisville Water Company had any water quality violations?

The EPA has 458 violations on file for Louisville Water Company, of which 38 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.