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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

MS0170025 , City of Horn Lake - Twin Lakes

22 of the 55 analytes this system has been tested for have been detected at least once, across 221 samples on record.

The other 33 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 221 samples on record, detections range from August 11, 1993 to September 29, 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 Horn Lake - Twin Lakes, 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 135 of 141 results Aug 11, 1993 Sep 12, 2025
Lead 1030 Inorganic Chemical 81 of 141 results Aug 11, 1993 Aug 26, 2025
TTHM 2950 Organic Chemical 19 of 20 results Jul 10, 2007 Sep 29, 2025
Bromodichloromethane 2943 Organic Chemical 14 of 15 results Jul 10, 2007 Sep 29, 2025
Dibromochloromethane 2944 Organic Chemical 14 of 15 results Jul 10, 2007 Sep 29, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 12 of 22 results Jul 10, 2007 Sep 29, 2025
Chloroform 2941 Organic Chemical 12 of 15 results Jul 10, 2007 Sep 29, 2025
Bromoform 2942 Organic Chemical 12 of 15 results Jul 10, 2007 Sep 29, 2025
Barium 1010 Inorganic Chemical 11 of 11 results Oct 8, 2019 Feb 7, 2024
Nickel 1036 Inorganic Chemical 11 of 11 results Oct 8, 2019 Feb 7, 2024
Fluoride 1025 Inorganic Chemical 9 of 11 results Dec 3, 2019 Feb 7, 2024
Dibromoacetic Acid 2454 Organic Chemical 7 of 16 results Jul 18, 2019 Sep 29, 2025
Dichloroacetic Acid 2451 Organic Chemical 6 of 16 results Jul 18, 2019 Sep 29, 2025
Chromium 1020 Inorganic Chemical 6 of 11 results Dec 3, 2019 Feb 7, 2024
Combined Radium (-226 & -228) 4010 Radionuclide 2 of 2 results Jan 27, 2020 Jun 16, 2020
Radium-228 4030 Radionuclide 2 of 2 results Jan 27, 2020 Jun 16, 2020
Monochloroacetic Acid 2450 Organic Chemical 1 of 16 results Jan 27, 2025 Jan 27, 2025
Nitrite 1041 Inorganic Chemical 1 of 9 results Jan 10, 2022 Jan 10, 2022
Monobromoacetic Acid 2453 Organic Chemical 1 of 16 results Aug 24, 2020 Aug 24, 2020
Radium-226 4020 Radionuclide 1 of 2 results Jun 16, 2020 Jun 16, 2020
Gross Alpha, Incl. Radon & U 4002 Radionuclide 1 of 1 result Jan 27, 2020 Jan 27, 2020
Sodium 1052 Inorganic Chemical 1 of 1 result Sep 17, 2019 Sep 17, 2019

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 221 samples, newest first — collected April 19, 2022 to April 19, 2022. The summary above covers all 221.

20 results from the 10 samples listed here: 11 detected, 9 not detected. Across the whole record it is 359 of 823. 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 10 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 Horn Lake - Twin Lakes, every result from 51 to 60 of 221 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
Apr 19, 2022 11:29
Sampling point
LC0020 Location withheld
Sample type
Routine
Lab sample
PB-220422-013
Laboratory
MSDH Lab
0.0179 mg/l , sample collected Apr 19, 2022 11:29, sampling point LC0020 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 19, 2022 11:29, sampling point LC0020 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 19, 2022 06:46
Sampling point
LC0015 Location withheld
Sample type
Routine
Lab sample
PB-220422-012
Laboratory
MSDH Lab
0.0109 mg/l , sample collected Apr 19, 2022 06:46, sampling point LC0015 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 19, 2022 06:46, sampling point LC0015 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 19, 2022 06:15
Sampling point
LC0003 Location withheld
Sample type
Routine
Lab sample
PB-220421-060
Laboratory
MSDH Lab
0.0012 mg/l , sample collected Apr 19, 2022 06:15, sampling point LC0003 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 19, 2022 06:15, sampling point LC0003 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 19, 2022 10:48
Sampling point
LC0027 Location withheld
Sample type
Routine
Lab sample
PB-220421-059
Laboratory
MSDH Lab
0.0047 mg/l , sample collected Apr 19, 2022 10:48, sampling point LC0027 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 19, 2022 10:48, sampling point LC0027 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 19, 2022 07:55
Sampling point
LC0006 Location withheld
Sample type
Routine
Lab sample
PB-220421-058
Laboratory
MSDH Lab
0.0077 mg/l , sample collected Apr 19, 2022 07:55, sampling point LC0006 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 19, 2022 07:55, sampling point LC0006 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 19, 2022 11:10
Sampling point
LC0013 Location withheld
Sample type
Routine
Lab sample
PB-220421-057
Laboratory
MSDH Lab
0.0044 mg/l , sample collected Apr 19, 2022 11:10, sampling point LC0013 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 19, 2022 11:10, sampling point LC0013 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 19, 2022 06:08
Sampling point
LC0017 Location withheld
Sample type
Routine
Lab sample
PB-220421-056
Laboratory
MSDH Lab
0.0498 mg/l , sample collected Apr 19, 2022 06:08, sampling point LC0017 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
0.8 ug/l , sample collected Apr 19, 2022 06:08, sampling point LC0017 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 19, 2022 05:45
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-220421-055
Laboratory
MSDH Lab
0.0191 mg/l , sample collected Apr 19, 2022 05:45, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 19, 2022 05:45, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 19, 2022 06:41
Sampling point
LC0007 Location withheld
Sample type
Routine
Lab sample
PB-220421-054
Laboratory
MSDH Lab
0.0084 mg/l , sample collected Apr 19, 2022 06:41, sampling point LC0007 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 19, 2022 06:41, sampling point LC0007 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 19, 2022 06:04
Sampling point
LC0038 Location withheld
Sample type
Routine
Lab sample
PB-220421-053
Laboratory
MSDH Lab
0.0025 mg/l , sample collected Apr 19, 2022 06:04, sampling point LC0038 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 19, 2022 06:04, sampling point LC0038 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022

Routine (10).