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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 121–130 of 221 samples, newest first — collected August 2, 2011 to April 23, 2019. The summary above covers all 221.

58 results from the 10 samples listed here: 11 detected, 47 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 121 to 130 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 23, 2019 13:30
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
190424-012VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Xylenes, Total 2955 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Dichloromethane 2964 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 O-Dichlorobenzene 2968 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 P-Dichlorobenzene 2969 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Vinyl Chloride 2976 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 1,1-Dichloroethylene 2977 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 1,2-Dichloroethane 2980 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 1,1,1-Trichloroethane 2981 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Carbon Tetrachloride 2982 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 1,2-Dichloropropane 2983 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Trichloroethylene 2984 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 1,1,2-Trichloroethane 2985 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Tetrachloroethylene 2987 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Chlorobenzene 2989 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Benzene 2990 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Toluene 2991 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Ethylbenzene 2992 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Apr 23, 2019 13:30, sampling point TF080 Styrene 2996 EPA method 524.2 Apr 1, 2019 – Jun 30, 2019
Collected
Feb 19, 2019 13:14
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
190220-017VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Dichloromethane 2964 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Benzene 2990 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Toluene 2991 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 19, 2019 13:14, sampling point TF080 Styrene 2996 EPA method 524.2 Jan 1, 2019 – Mar 31, 2019
Collected
Feb 12, 2019 13:07
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
190213-001NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 12, 2019 13:07, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2019 – Mar 31, 2019
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 12, 2019 13:07, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2019 – Mar 31, 2019
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 12, 2019 13:07, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2019 – Mar 31, 2019
Collected
Jan 29, 2019 13:10
Sampling point
TF080 Treatment Plant TF080
Sample type
Routine
Lab sample
190201-004RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 29, 2019 13:10, sampling point TF080 Combined Uranium 4006 EPA method 200.8 Jan 1, 2019 – Mar 31, 2019
Collected
Aug 3, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110804-126PB
Laboratory
MSDH Lab
0.1393 mg/l , sample collected Aug 3, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Not recorded
0.0106 mg/l , sample collected Aug 3, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Not recorded
Collected
Aug 2, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110803-023PB
Laboratory
MSDH Lab
0.4123 mg/l , sample collected Aug 2, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Not recorded
0.0011 mg/l , sample collected Aug 2, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Not recorded
Collected
Aug 2, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110803-022PB
Laboratory
MSDH Lab
0.0679 mg/l , sample collected Aug 2, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Not recorded
0.0016 mg/l , sample collected Aug 2, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Not recorded
Collected
Aug 2, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110803-016PB
Laboratory
MSDH Lab
0.0295 mg/l , sample collected Aug 2, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 2, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Not recorded
Collected
Aug 2, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110803-015PB
Laboratory
MSDH Lab
0.1392 mg/l , sample collected Aug 2, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Not recorded
0.0017 mg/l , sample collected Aug 2, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Not recorded
Collected
Aug 2, 2011
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
110803-014PB
Laboratory
MSDH Lab
0.1327 mg/l , sample collected Aug 2, 2011, sampling point DS000 Copper, Free 1022 EPA method 200.8 Not recorded
0.0009 mg/l , sample collected Aug 2, 2011, sampling point DS000 Lead 1030 EPA method 200.8 Not recorded

Routine (10).