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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 61–70 of 255 samples, newest first — collected September 22, 2021 to August 10, 2022. The summary above covers all 255.

30 results from the 10 samples listed here: 20 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 4 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 61 to 70 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 04:30
Sampling point
LC0007 Location withheld
Sample type
Routine
Lab sample
PB-220811-144
Laboratory
MSDH Lab
0.0044 mg/l , sample collected Aug 10, 2022 04:30, sampling point LC0007 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.5 ug/l , sample collected Aug 10, 2022 04:30, sampling point LC0007 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 10, 2022 06:00
Sampling point
LC0005 Location withheld
Sample type
Routine
Lab sample
PB-220811-145
Laboratory
MSDH Lab
0.0043 mg/l , sample collected Aug 10, 2022 06:00, sampling point LC0005 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 LC0005 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 10, 2022 12:00
Sampling point
LC0006 Location withheld
Sample type
Routine
Lab sample
PB-220811-146
Laboratory
MSDH Lab
0.0194 mg/l , sample collected Aug 10, 2022 12:00, sampling point LC0006 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
17.6 ug/l , sample collected Aug 10, 2022 12:00, sampling point LC0006 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Aug 1, 2022 07:00
Sampling point
LC0034 Location withheld
Sample type
Routine
Lab sample
PB-220811-133
Laboratory
MSDH Lab
0.0012 mg/l , sample collected Aug 1, 2022 07:00, sampling point LC0034 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 1, 2022 07:00, sampling point LC0034 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Apr 4, 2022 13:40
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-220405-019
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 4, 2022 13:40, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2022 – Dec 31, 2022
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 4, 2022 13:40, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2022 – Dec 31, 2022
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 4, 2022 13:40, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2022 – Dec 31, 2022
Collected
Dec 7, 2021 11:20
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-211208-022
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 7, 2021 11:20, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Dec 7, 2021 11:20
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-211208-017
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 7, 2021 11:20, sampling point MRT000 TTHM 2950 EPA method 524.2 Not recorded
Collected
Oct 28, 2021 11:23
Sampling point
WL004 Well W004
Sample type
Routine
Lab sample
7PC-211029-002
Laboratory
MSDH Lab
2.99 mg/l , sample collected Oct 28, 2021 11:23, sampling point WL004 Calcium 1016 EPA method 200.7 Not recorded
3.75 mg/l , sample collected Oct 28, 2021 11:23, sampling point WL004 Chloride 1017 EPA method 300.0 Not recorded
0.051 mg/l , sample collected Oct 28, 2021 11:23, sampling point WL004 Fluoride 1025 EPA method 300.0 Not recorded
7.83 mg/l , sample collected Oct 28, 2021 11:23, sampling point WL004 Sodium 1052 EPA method 200.7 Not recorded
7.24 mg/l , sample collected Oct 28, 2021 11:23, sampling point WL004 Sulfate 1055 EPA method 300.0 Not recorded
71.8 umho/cm , sample collected Oct 28, 2021 11:23, sampling point WL004 Conductivity @ 25 C Umhos/CM 1064 EPA method 2510B Not recorded
Not detected below 10 cu Minimum Reporting Level , sample collected Oct 28, 2021 11:23, sampling point WL004 Color 1905 EPA method 2120B Not recorded
23.9 mg/l , sample collected Oct 28, 2021 11:23, sampling point WL004 Alkalinity, Total 1927 EPA method 2320B Not recorded
Collected
Oct 28, 2021 11:15
Sampling point
WL002 Well W002
Sample type
Routine
Lab sample
7PC-211029-001
Laboratory
MSDH Lab
3.51 mg/l , sample collected Oct 28, 2021 11:15, sampling point WL002 Calcium 1016 EPA method 200.7 Not recorded
4.99 mg/l , sample collected Oct 28, 2021 11:15, sampling point WL002 Chloride 1017 EPA method 300.0 Not recorded
0.0603 mg/l , sample collected Oct 28, 2021 11:15, sampling point WL002 Fluoride 1025 EPA method 300.0 Not recorded
10.2 mg/l , sample collected Oct 28, 2021 11:15, sampling point WL002 Sodium 1052 EPA method 200.7 Not recorded
9.81 mg/l , sample collected Oct 28, 2021 11:15, sampling point WL002 Sulfate 1055 EPA method 300.0 Not recorded
91 umho/cm , sample collected Oct 28, 2021 11:15, sampling point WL002 Conductivity @ 25 C Umhos/CM 1064 EPA method 2510B Not recorded
Not detected below 10 cu Minimum Reporting Level , sample collected Oct 28, 2021 11:15, sampling point WL002 Color 1905 EPA method 2120B Not recorded
28.2 mg/l , sample collected Oct 28, 2021 11:15, sampling point WL002 Alkalinity, Total 1927 EPA method 2320B Not recorded
Collected
Sep 22, 2021 13:55
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
RU-210923-011
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 22, 2021 13:55, sampling point TF080 Combined Uranium 4006 EPA method 200.8 Jan 1, 2013 – Dec 31, 2021

Routine (10).