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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

MS0170022 , City of Horn Lake

31 of the 90 analytes this system has been tested for have been detected at least once, across 830 samples on record.

The other 59 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 830 samples on record, detections range from December 10, 1992 to June 30, 2026. 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, 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 354 of 376 results Dec 10, 1992 Jul 23, 2024
Lead 1030 Inorganic Chemical 147 of 376 results Dec 10, 1992 Jul 23, 2024
TTHM 2950 Organic Chemical 57 of 64 results Mar 9, 2004 Jun 30, 2026
Barium 1010 Inorganic Chemical 53 of 53 results May 14, 2002 Feb 3, 2025
Nickel 1036 Inorganic Chemical 53 of 53 results May 14, 2002 Feb 3, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 39 of 62 results Oct 13, 2005 Sep 29, 2025
Dibromochloromethane 2944 Organic Chemical 37 of 45 results Jul 26, 2006 Jun 30, 2026
Bromodichloromethane 2943 Organic Chemical 35 of 45 results Jul 26, 2006 Sep 29, 2025
Chloroform 2941 Organic Chemical 32 of 45 results Jul 26, 2006 Sep 29, 2025
Nitrate-Nitrite 1038 Inorganic Chemical 29 of 100 results May 5, 2004 Jun 2, 2026
Nitrate 1040 Inorganic Chemical 29 of 100 results May 5, 2004 Jun 2, 2026
Chromium 1020 Inorganic Chemical 23 of 53 results May 14, 2002 Jan 20, 2021
Dichloroacetic Acid 2451 Organic Chemical 22 of 40 results Jun 25, 2008 Sep 29, 2025
Fluoride 1025 Inorganic Chemical 20 of 55 results Jan 28, 2004 Feb 3, 2025
Bromoform 2942 Organic Chemical 14 of 45 results Jul 1, 2009 Sep 29, 2025
Monochloroacetic Acid 2450 Organic Chemical 13 of 40 results Jun 6, 2012 Aug 24, 2020
Dibromoacetic Acid 2454 Organic Chemical 12 of 40 results Jul 1, 2009 Sep 29, 2025
Sodium 1052 Inorganic Chemical 12 of 12 results Sep 17, 2019 Oct 14, 2024
Selenium 1045 Inorganic Chemical 11 of 53 results Jan 26, 2004 Apr 21, 2008
Cadmium 1015 Inorganic Chemical 10 of 53 results Feb 28, 2005 Apr 21, 2008
Sulfate 1055 Inorganic Chemical 10 of 10 results May 14, 2002 Jan 28, 2004
Xylenes, Total 2955 Organic Chemical 8 of 90 results Aug 31, 2005 Aug 24, 2021
Arsenic 1005 Inorganic Chemical 7 of 53 results Jan 25, 2006 Apr 2, 2008
Radium-226 4020 Radionuclide 6 of 14 results May 1, 2018 Jun 25, 2019
Combined Radium (-226 & -228) 4010 Radionuclide 4 of 14 results May 1, 2018 Jun 25, 2019
Radium-228 4030 Radionuclide 4 of 14 results May 1, 2018 Jun 25, 2019
Gross Alpha, Incl. Radon & U 4002 Radionuclide 3 of 6 results Jun 25, 2019 Jun 25, 2019
Trichloroacetic Acid 2452 Organic Chemical 3 of 40 results Jun 25, 2008 Apr 14, 2014
Thallium, Total 1085 Inorganic Chemical 2 of 53 results Oct 3, 2018 Feb 3, 2025
Monobromoacetic Acid 2453 Organic Chemical 2 of 40 results Jul 19, 2011 Aug 24, 2020
Ethylbenzene 2992 Organic Chemical 2 of 90 results Aug 31, 2005 May 21, 2013

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 141–150 of 830 samples, newest first — collected August 24, 2020 to February 3, 2021. The summary above covers all 830.

70 results from the 10 samples listed here: 24 detected, 46 not detected. Across the whole record it is 1,053 of 4,217. 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 1 sampling point 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, every result from 141 to 150 of 830 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 3, 2021 13:47
Sampling point
TF083
Sample type
Routine
Lab sample
NI-210204-042
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 3, 2021 13:47, sampling point TF083 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 3, 2021 13:47, sampling point TF083 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 3, 2021 13:47, sampling point TF083 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Feb 3, 2021 13:36
Sampling point
TF081 Treatment Plant T081
Sample type
Routine
Lab sample
NI-210204-043
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 3, 2021 13:36, sampling point TF081 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 3, 2021 13:36, sampling point TF081 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 3, 2021 13:36, sampling point TF081 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Feb 3, 2021 13:24
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-210204-044
Laboratory
MSDH Lab
0.395 mg/l , sample collected Feb 3, 2021 13:24, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
0.395 mg/l , sample collected Feb 3, 2021 13:24, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 3, 2021 13:24, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Jan 20, 2021 13:01
Sampling point
TF081 Treatment Plant T081
Sample type
Routine
Lab sample
IN-210121-035
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:01, sampling point TF081 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0231 mg/l , sample collected Jan 20, 2021 13:01, sampling point TF081 Barium 1010 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:01, sampling point TF081 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:01, sampling point TF081 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
1.35 mg/l , sample collected Jan 20, 2021 13:01, sampling point TF081 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:01, sampling point TF081 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0028 mg/l , sample collected Jan 20, 2021 13:01, sampling point TF081 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:01, sampling point TF081 Selenium 1045 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:01, sampling point TF081 Antimony, Total 1074 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:01, sampling point TF081 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:01, sampling point TF081 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jan 20, 2021 13:06
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
IN-210121-034
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:06, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0224 mg/l , sample collected Jan 20, 2021 13:06, sampling point TF080 Barium 1010 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:06, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0006 mg/l , sample collected Jan 20, 2021 13:06, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
1.3 mg/l , sample collected Jan 20, 2021 13:06, sampling point TF080 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:06, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0014 mg/l , sample collected Jan 20, 2021 13:06, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:06, sampling point TF080 Selenium 1045 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:06, sampling point TF080 Antimony, Total 1074 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:06, sampling point TF080 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:06, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jan 20, 2021 13:12
Sampling point
TF082 Treatment Plant T082
Sample type
Routine
Lab sample
IN-210121-033
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:12, sampling point TF082 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0161 mg/l , sample collected Jan 20, 2021 13:12, sampling point TF082 Barium 1010 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:12, sampling point TF082 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:12, sampling point TF082 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.846 mg/l , sample collected Jan 20, 2021 13:12, sampling point TF082 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:12, sampling point TF082 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0032 mg/l , sample collected Jan 20, 2021 13:12, sampling point TF082 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:12, sampling point TF082 Selenium 1045 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:12, sampling point TF082 Antimony, Total 1074 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:12, sampling point TF082 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 13:12, sampling point TF082 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jan 20, 2021 12:55
Sampling point
TF083
Sample type
Routine
Lab sample
IN-210121-032
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 12:55, sampling point TF083 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0169 mg/l , sample collected Jan 20, 2021 12:55, sampling point TF083 Barium 1010 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 12:55, sampling point TF083 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 12:55, sampling point TF083 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.89 mg/l , sample collected Jan 20, 2021 12:55, sampling point TF083 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 12:55, sampling point TF083 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0023 mg/l , sample collected Jan 20, 2021 12:55, sampling point TF083 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 12:55, sampling point TF083 Selenium 1045 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 12:55, sampling point TF083 Antimony, Total 1074 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 12:55, sampling point TF083 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 20, 2021 12:55, sampling point TF083 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Dec 15, 2020 13:12
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
201216-018HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Dec 15, 2020 13:12, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Dec 15, 2020 13:12, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Dec 15, 2020 13:12, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Dec 15, 2020 13:12, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Dec 15, 2020 13:12, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 0.006 mg/l Minimum Reporting Level , sample collected Dec 15, 2020 13:12, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2020 – Dec 31, 2020
Collected
Dec 15, 2020 13:12
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
201216-018TH
Laboratory
MSDH Lab
1.32 ug/l , sample collected Dec 15, 2020 13:12, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
1.34 ug/l , sample collected Dec 15, 2020 13:12, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
1.63 ug/l , sample collected Dec 15, 2020 13:12, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
3.52 ug/l , sample collected Dec 15, 2020 13:12, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
7.81 ug/l , sample collected Dec 15, 2020 13:12, sampling point SM1 TTHM 2950 Jan 1, 2020 – Dec 31, 2020
Collected
Aug 24, 2020 13:45
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
200825-009HA
Laboratory
MSDH Lab
0.002 mg/l , sample collected Aug 24, 2020 13:45, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.001 mg/l , sample collected Aug 24, 2020 13:45, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 24, 2020 13:45, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
0.006 mg/l , sample collected Aug 24, 2020 13:45, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 24, 2020 13:45, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.009 mg/l , sample collected Aug 24, 2020 13:45, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2020 – Dec 31, 2020

Routine (10).