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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 31–40 of 221 samples, newest first — collected November 16, 2022 to February 7, 2024. The summary above covers all 221.

34 results from the 10 samples listed here: 9 detected, 25 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.

Chemical and radiological sample results for City of Horn Lake - Twin Lakes, every result from 31 to 40 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
Feb 7, 2024 14:30
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
IN-240208-009
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 14:30, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
0.0505 mg/l , sample collected Feb 7, 2024 14:30, sampling point TF080 Barium 1010 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 14:30, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
0.0017 mg/l , sample collected Feb 7, 2024 14:30, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
0.13 mg/l , sample collected Feb 7, 2024 14:30, sampling point TF080 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2024 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 14:30, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
0.0011 mg/l , sample collected Feb 7, 2024 14:30, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 14:30, sampling point TF080 Selenium 1045 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 14:30, sampling point TF080 Antimony, Total 1074 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 14:30, sampling point TF080 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 14:30, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2024 – Dec 31, 2024
Collected
Jan 24, 2024 14:27
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
NI-240125-010
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 24, 2024 14:27, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 24, 2024 14:27, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 24, 2024 14:27, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
Oct 31, 2023 14:42
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
IN-231101-014
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 31, 2023 14:42, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
0.0504 mg/l , sample collected Oct 31, 2023 14:42, sampling point TF080 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 31, 2023 14:42, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 31, 2023 14:42, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
1.03 mg/l , sample collected Oct 31, 2023 14:42, sampling point TF080 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 31, 2023 14:42, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
0.0017 mg/l , sample collected Oct 31, 2023 14:42, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Oct 31, 2023 14:42, sampling point TF080 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 31, 2023 14:42, sampling point TF080 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 31, 2023 14:42, sampling point TF080 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 31, 2023 14:42, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2023
Collected
Oct 16, 2023 13:50
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
CN-231017-001
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Oct 16, 2023 13:50, sampling point TF080 Cyanide 1024 EPA method QC10204001X Oct 1, 2023 – Dec 31, 2023
Collected
May 16, 2023 13:20
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
CN-230517-001
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 16, 2023 13:20, sampling point TF080 Cyanide 1024 EPA method QC10204001X Apr 1, 2023 – Jun 30, 2023
Collected
Apr 26, 2023 14:03
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-230427-021
Laboratory
MSDH Lab
1.12 ug/l , sample collected Apr 26, 2023 14:03, sampling point MRT000 TTHM 2950 EPA method 524.2 Not recorded
Collected
Apr 26, 2023 14:03
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-230427-021
Laboratory
MSDH Lab
1.82 ug/l , sample collected Apr 26, 2023 14:03, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Mar 15, 2023 13:40
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
CN-230316-004
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Mar 15, 2023 13:40, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Mar 31, 2023
Collected
Jan 24, 2023 14:07
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
NI-230125-014
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 24, 2023 14:07, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 24, 2023 14:07, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 24, 2023 14:07, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Collected
Nov 16, 2022 13:18
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
CN-221117-004
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Nov 16, 2022 13:18, sampling point TF080 Cyanide 1024 EPA method QC10204001X Oct 1, 2022 – Dec 31, 2022

Routine (10).