Community Water System · PWS KY0560258
Louisville Water Company
Operator location Louisville, Kentucky - larger served population (> 3,309) at 764,769 people served; 660 SDWIS violations on record from surface water sources.
- 764,769
- People served (this PWS)
- 660
- EPA violations (this PWS)
- 38
- Health-based (this PWS)
- 4 PFAS
- UCMR5 (this PWS)
Louisville Water Company standing, high SDWIS violation third
764,769 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 6% is middle-third health share (≤ 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #36 of 29,740 among systems serving 500+.
The verdict
Louisville Water Company sits in the upper third of the sitemap cohort by violation count (660), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (764,769; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 6% (middle-third health share (≤ 23%)). UCMR5 detected 4 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #36 of 29,740
- Population · /systems
- #1 of 352
- Population · KY
- 660
- Total EPA violations on record
- 6%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 311,310
- County
- Jefferson
- School/Daycare
- No
- MCL Violations
- 38
- Monitoring Violations
- 418
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Thallium, Total | MR | 26 | 1999 |
| Coliform (TCR) | MCL | 24 | 1997 |
| Coliform (TCR) | MR | 21 | 2004 |
| Beryllium, Total | MR | 14 | 1999 |
| Cadmium | MR | 14 | 1999 |
| Nitrate | MR | 12 | 1998 |
| Dalapon | MR | 12 | 1996 |
| Picloram | MR | 12 | 1996 |
| Dinoseb | MR | 12 | 1996 |
| Aldicarb sulfone | MR | 12 | 1996 |
| Aldicarb | MR | 12 | 1996 |
| Pentachlorophenol | MR | 12 | 1996 |
| Vinyl chloride | MR | 12 | 1996 |
| 1,2-Dichloroethane | MR | 12 | 1996 |
| 1,1,1-Trichloroethane | MR | 12 | 1996 |
| Carbon tetrachloride | MR | 12 | 1996 |
| Trichloroethylene | MR | 12 | 1996 |
| Aldicarb sulfoxide | MR | 12 | 1996 |
| Carbofuran | MR | 12 | 1996 |
| 1,1-Dichloroethylene | MR | 12 | 1996 |
| OXAMYL | MR | 12 | 1996 |
| p-Dichlorobenzene | MR | 12 | 1996 |
| Benzene | MR | 12 | 1996 |
| Mercury | MR | 11 | 1996 |
| Selenium | MR | 6 | 1996 |
| Thallium, Total | MCL | 6 | 1997 |
| 1,2,4-Trichlorobenzene | MR | 6 | 1996 |
| cis-1,2-Dichloroethylene | MR | 6 | 1996 |
| DICHLOROMETHANE | MR | 6 | 1996 |
| trans-1,2-Dichloroethylene | MR | 6 | 1996 |
Violation Count vs. the National Corpus
Louisville Water Company has 660 recorded EPA violations, 97% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 3% carry more. 6% of this system's own violations are health-based (38 of 660), and it ranks #36 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
660 Higher than most more violations than 97% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 6 of 174 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFOA | 9/27/2023 | 7.50 ppt | 4.00 ppt | Detected |
| PFOS | 9/27/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 9/27/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 9/27/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 9/27/2023 | 3.00 ppt | 3.00 ppt | Detected |
| PFDA | 9/27/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 9/27/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 9/27/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMBA | 9/27/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 9/27/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 9/27/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 9/27/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 9/27/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 9/27/2023 | 3.90 ppt | 3.00 ppt | Detected |
| PFDoA | 9/27/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 9/27/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 9/27/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 9/27/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFUnA | 9/27/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 9/27/2023 | 3.40 ppt | 3.00 ppt | Detected |
| PFHpS | 9/27/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/27/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/27/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| HFPO-DA | 9/27/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 9/27/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 8/16/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| NMeFOSAA | 8/16/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTrDA | 8/16/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 8/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMBA | 8/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/16/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| NMeFOSAA | 8/16/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 8/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 8/16/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 8/16/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHpS | 8/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/16/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 8/16/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 8/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 8/16/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| HFPO-DA | 8/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 8/16/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 8/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 8/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
Population served record for Louisville Water Company
EPA SDWIS lists 764,769 people served and 311,310 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
660 violations · 764,769 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Louisville Water Company
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Kentucky compares on the same EPA violation measures. Kentucky systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.