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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.

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

No date range is applied: this list draws on every sample on record. Show the last two years only.

The most recent samples, result by result

The table below lists 51–60 of 255 samples, newest first — collected August 10, 2022 to August 10, 2022. The summary above covers all 255.

20 results from the 10 samples listed here: 10 detected, 10 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 51 to 60 of 255 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
Aug 10, 2022 06:40
Sampling point
LC0002 Location withheld
Sample type
Routine
Lab sample
PB-220811-136
Laboratory
MSDH Lab
0.0043 mg/l , sample collected Aug 10, 2022 06:40, sampling point LC0002 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 10, 2022 06:40, sampling point LC0002 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 10, 2022 07:44
Sampling point
LC0003 Location withheld
Sample type
Routine
Lab sample
PB-220811-130
Laboratory
MSDH Lab
0.0052 mg/l , sample collected Aug 10, 2022 07:44, sampling point LC0003 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 10, 2022 07:44, sampling point LC0003 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 10, 2022 04:50
Sampling point
LC0008 Location withheld
Sample type
Routine
Lab sample
PB-220811-128
Laboratory
MSDH Lab
0.0068 mg/l , sample collected Aug 10, 2022 04:50, sampling point LC0008 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 10, 2022 04:50, sampling point LC0008 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 10, 2022 08:00
Sampling point
LC0028 Location withheld
Sample type
Routine
Lab sample
PB-220811-129
Laboratory
MSDH Lab
0.0064 mg/l , sample collected Aug 10, 2022 08:00, sampling point LC0028 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 10, 2022 08:00, sampling point LC0028 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 10, 2022 05:00
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-220811-141
Laboratory
MSDH Lab
0.0056 mg/l , sample collected Aug 10, 2022 05:00, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 10, 2022 05:00, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 10, 2022 08:40
Sampling point
LC0019 Location withheld
Sample type
Routine
Lab sample
PB-220811-138
Laboratory
MSDH Lab
0.0078 mg/l , sample collected Aug 10, 2022 08:40, sampling point LC0019 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 10, 2022 08:40, sampling point LC0019 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 10, 2022 06:00
Sampling point
LC0016 Location withheld
Sample type
Routine
Lab sample
PB-220811-139
Laboratory
MSDH Lab
0.0078 mg/l , sample collected Aug 10, 2022 06:00, sampling point LC0016 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 10, 2022 06:00, sampling point LC0016 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 10, 2022 06:00
Sampling point
LC0037 Location withheld
Sample type
Routine
Lab sample
PB-220811-140
Laboratory
MSDH Lab
0.0043 mg/l , sample collected Aug 10, 2022 06:00, sampling point LC0037 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 10, 2022 06:00, sampling point LC0037 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 10, 2022 09:33
Sampling point
LC0019 Location withheld
Sample type
Routine
Lab sample
PB-220811-143
Laboratory
MSDH Lab
0.0036 mg/l , sample collected Aug 10, 2022 09:33, sampling point LC0019 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 10, 2022 09:33, sampling point LC0019 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 10, 2022 00:01
Sampling point
LC0029 Location withheld
Sample type
Routine
Lab sample
PB-220811-142
Laboratory
MSDH Lab
0.003 mg/l , sample collected Aug 10, 2022 00:01, sampling point LC0029 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 10, 2022 00:01, sampling point LC0029 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022

Routine (10).