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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 41–50 of 221 samples, newest first — collected April 20, 2022 to August 24, 2022. The summary above covers all 221.

37 results from the 10 samples listed here: 7 detected, 30 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 7 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 41 to 50 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
Aug 24, 2022 13:08
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
CN-220825-004
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Aug 24, 2022 13:08, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jul 1, 2022 – Sep 30, 2022
Collected
May 17, 2022 12:30
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
VO-220518-005
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Dichloromethane 2964 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Benzene 2990 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Toluene 2991 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 17, 2022 12:30, sampling point TF080 Styrene 2996 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Collected
May 4, 2022 13:29
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
CN-220505-010
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 4, 2022 13:29, sampling point TF080 Cyanide 1024 EPA method QC10204001X Apr 1, 2022 – Jun 30, 2022
Collected
Apr 21, 2022 08:06
Sampling point
LC0005 Location withheld
Sample type
Routine
Lab sample
PB-220422-020
Laboratory
MSDH Lab
0.0094 mg/l , sample collected Apr 21, 2022 08:06, sampling point LC0005 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 21, 2022 08:06, sampling point LC0005 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 20, 2022 07:15
Sampling point
LC0022 Location withheld
Sample type
Routine
Lab sample
PB-220422-019
Laboratory
MSDH Lab
0.0367 mg/l , sample collected Apr 20, 2022 07:15, sampling point LC0022 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 20, 2022 07:15, sampling point LC0022 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 20, 2022 04:00
Sampling point
LC0021 Location withheld
Sample type
Routine
Lab sample
PB-220422-018
Laboratory
MSDH Lab
0.0026 mg/l , sample collected Apr 20, 2022 04:00, sampling point LC0021 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 20, 2022 04:00, sampling point LC0021 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 20, 2022 06:30
Sampling point
LC0034 Location withheld
Sample type
Routine
Lab sample
PB-220422-017
Laboratory
MSDH Lab
0.0177 mg/l , sample collected Apr 20, 2022 06:30, sampling point LC0034 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 20, 2022 06:30, sampling point LC0034 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 20, 2022 06:30
Sampling point
LC0037 Location withheld
Sample type
Routine
Lab sample
PB-220422-016
Laboratory
MSDH Lab
0.007 mg/l , sample collected Apr 20, 2022 06:30, sampling point LC0037 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 20, 2022 06:30, sampling point LC0037 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 20, 2022 09:00
Sampling point
LC0029 Location withheld
Sample type
Routine
Lab sample
PB-220422-015
Laboratory
MSDH Lab
0.0128 mg/l , sample collected Apr 20, 2022 09:00, sampling point LC0029 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 20, 2022 09:00, sampling point LC0029 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022
Collected
Apr 20, 2022 07:00
Sampling point
LC0033 Location withheld
Sample type
Routine
Lab sample
PB-220422-014
Laboratory
MSDH Lab
0.0213 mg/l , sample collected Apr 20, 2022 07:00, sampling point LC0033 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 20, 2022 07:00, sampling point LC0033 Lead 1030 EPA method 200.8 Jan 1, 2022 – Jun 30, 2022

Routine (10).