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This is a rebuild of Drinking Water Watch and not yet the official record. Use the agency’s current Drinking Water Watch for anything you need to rely on.

Chemical and radiological sample results

MS0800004 , City of Louisville

25 of the 65 analytes this system has been tested for have been detected at least once, across 255 samples on record.

The other 40 were tested for and never found. An analyte is counted here if any result on record measured it, so this covers the whole history and not the samples listed below.

Across all 255 samples on record, detections range from November 3, 2003 to August 26, 2025. These figures cover the whole record; the list of samples further down is narrowed.

What counts as a non-detect is defined in the help: Less than Indicator. This system’s violations.

What has been detected, ever

Every analyte measured above its reporting level at any point in this system’s record, most often detected first. This is not limited to the samples listed below.

Every analyte ever detected for City of Louisville, with how many results found it and when it was first and last detected. Covers the whole record, not only the samples listed below.
Analyte Kind Detected in First detected Last detected
Copper, Free 1022 Inorganic Chemical 158 of 160 results Jun 17, 2004 Aug 26, 2025
Lead 1030 Inorganic Chemical 22 of 160 results Jun 17, 2004 Aug 25, 2025
Fluoride 1025 Inorganic Chemical 12 of 12 results Nov 3, 2003 Apr 8, 2025
Barium 1010 Inorganic Chemical 10 of 10 results Nov 3, 2003 Apr 8, 2025
TTHM 2950 Organic Chemical 9 of 20 results Aug 30, 2004 Apr 28, 2025
Nickel 1036 Inorganic Chemical 9 of 10 results Apr 5, 2004 Apr 8, 2025
Dibromochloromethane 2944 Organic Chemical 5 of 14 results Jun 20, 2011 Apr 28, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 5 results Mar 13, 2012 Oct 9, 2012
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 4 of 20 results Nov 29, 2005 Sep 17, 2024
Sodium 1052 Inorganic Chemical 4 of 4 results Sep 18, 2019 Mar 20, 2023
Sulfate 1055 Inorganic Chemical 4 of 4 results Nov 3, 2003 Oct 28, 2021
Bromodichloromethane 2943 Organic Chemical 3 of 14 results Aug 28, 2024 Apr 28, 2025
Bromoform 2942 Organic Chemical 3 of 14 results Jul 16, 2014 Nov 6, 2024
Chromium 1020 Inorganic Chemical 2 of 10 results Nov 3, 2003 Apr 8, 2025
Chloroform 2941 Organic Chemical 2 of 14 results Nov 16, 2020 Aug 28, 2024
Calcium 1016 Inorganic Chemical 2 of 2 results Oct 28, 2021 Oct 28, 2021
Chloride 1017 Inorganic Chemical 2 of 2 results Oct 28, 2021 Oct 28, 2021
Conductivity @ 25 C Umhos/CM 1064 Water Quality 2 of 2 results Oct 28, 2021 Oct 28, 2021
Alkalinity, Total 1927 Water Quality 2 of 2 results Oct 28, 2021 Oct 28, 2021
Monochloroacetic Acid 2450 Organic Chemical 1 of 13 results Aug 14, 2017 Aug 14, 2017
Gross Beta Particle Activity 4100 Radionuclide 1 of 1 result Mar 8, 2010 Mar 8, 2010
Combined Radium (-226 & -228) 4010 Radionuclide 1 of 7 results Sep 25, 2009 Sep 25, 2009
Radium-226 4020 Radionuclide 1 of 7 results Sep 25, 2009 Sep 25, 2009
Radium-228 4030 Radionuclide 1 of 7 results Sep 25, 2009 Sep 25, 2009
Selenium 1045 Inorganic Chemical 1 of 10 results Apr 18, 2006 Apr 18, 2006

Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.

Show every sample on record

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The most recent samples, result by result

The table below lists 1–10 of 28 samples, newest first — collected August 25, 2025 to December 10, 2025. The summary above covers all 28.

28 results from the 10 samples listed here: 9 detected, 19 not detected. Across the whole record it is 266 of 869. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

We withheld the location of 9 sampling points below. The location on record identifies a private home, and we do not publish those. That is our decision, not the agency’s. The sampling point, its type and every result taken there are published unchanged.

Chemical and radiological sample results for City of Louisville, every result from 1 to 10 of 28 samples shown, newest first. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Dec 10, 2025 08:30
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
CN-251211-016
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Dec 10, 2025 08:30, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Sep 23, 2025 08:30
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
810-165161-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Sep 23, 2025 08:30, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 23, 2025 08:30, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 23, 2025 08:30, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 23, 2025 08:30, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 23, 2025 08:30, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Sep 23, 2025 08:30, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 23, 2025 08:30, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 23, 2025 08:30, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 23, 2025 08:30, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 23, 2025 08:30, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 23, 2025 08:30, sampling point SM1 TTHM 2950 EPA method 524.2 Not recorded
Collected
Aug 26, 2025 07:30
Sampling point
LC0027 Location withheld
Sample type
Routine
Lab sample
PB-250827-058
Laboratory
MSDH Lab
0.0283 mg/l , sample collected Aug 26, 2025 07:30, sampling point LC0027 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 26, 2025 07:30, sampling point LC0027 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Aug 26, 2025 06:00
Sampling point
LC0037 Location withheld
Sample type
Routine
Lab sample
PB-250827-066
Laboratory
MSDH Lab
0.0245 mg/l , sample collected Aug 26, 2025 06:00, sampling point LC0037 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 26, 2025 06:00, sampling point LC0037 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Aug 25, 2025 05:30
Sampling point
LC0003 Location withheld
Sample type
Routine
Lab sample
PB-250827-060
Laboratory
MSDH Lab
0.0027 mg/l , sample collected Aug 25, 2025 05:30, sampling point LC0003 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 25, 2025 05:30, sampling point LC0003 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Aug 25, 2025 15:00
Sampling point
LC0026 Location withheld
Sample type
Routine
Lab sample
PB-250827-059
Laboratory
MSDH Lab
0.0076 mg/l , sample collected Aug 25, 2025 15:00, sampling point LC0026 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 25, 2025 15:00, sampling point LC0026 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Aug 25, 2025 11:15
Sampling point
LC0038 Location withheld
Sample type
Routine
Lab sample
PB-250827-057
Laboratory
MSDH Lab
0.0032 mg/l , sample collected Aug 25, 2025 11:15, sampling point LC0038 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 25, 2025 11:15, sampling point LC0038 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Aug 25, 2025 13:30
Sampling point
LC0014 Location withheld
Sample type
Routine
Lab sample
PB-250827-056
Laboratory
MSDH Lab
0.0036 mg/l , sample collected Aug 25, 2025 13:30, sampling point LC0014 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.7 ug/l , sample collected Aug 25, 2025 13:30, sampling point LC0014 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Aug 25, 2025 14:40
Sampling point
LC0015 Location withheld
Sample type
Routine
Lab sample
PB-250827-055
Laboratory
MSDH Lab
0.0352 mg/l , sample collected Aug 25, 2025 14:40, sampling point LC0015 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 25, 2025 14:40, sampling point LC0015 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Aug 25, 2025 11:45
Sampling point
LC0029 Location withheld
Sample type
Routine
Lab sample
PB-250827-054
Laboratory
MSDH Lab
0.0137 mg/l , sample collected Aug 25, 2025 11:45, sampling point LC0029 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 25, 2025 11:45, sampling point LC0029 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025

Routine (10).