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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

MS0170024 , City of Horn Lake - Holly Hills

25 of the 57 analytes this system has been tested for have been detected at least once, across 257 samples on record.

The other 32 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 257 samples on record, detections range from August 11, 1993 to February 23, 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 - Holly Hills, 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 128 of 145 results Aug 11, 1993 Jul 30, 2025
Lead 1030 Inorganic Chemical 82 of 145 results Aug 11, 1993 Jul 30, 2025
Nitrate-Nitrite 1038 Inorganic Chemical 23 of 23 results May 12, 2004 Feb 23, 2026
Nitrate 1040 Inorganic Chemical 23 of 23 results May 12, 2004 Feb 23, 2026
TTHM 2950 Organic Chemical 13 of 20 results Jul 10, 2007 Jun 4, 2025
Barium 1010 Inorganic Chemical 11 of 11 results May 14, 2002 Feb 3, 2025
Fluoride 1025 Inorganic Chemical 10 of 11 results May 14, 2002 Feb 3, 2025
Nickel 1036 Inorganic Chemical 10 of 11 results May 14, 2002 Feb 3, 2025
Chromium 1020 Inorganic Chemical 9 of 11 results Jan 28, 2004 Feb 3, 2025
Dibromochloromethane 2944 Organic Chemical 8 of 15 results Sep 4, 2024 Jun 4, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 8 of 20 results Jul 10, 2007 Jul 25, 2023
Bromoform 2942 Organic Chemical 7 of 15 results Sep 4, 2024 Jun 4, 2025
Xylenes, Total 2955 Organic Chemical 7 of 24 results Apr 21, 2008 Apr 12, 2010
Bromodichloromethane 2943 Organic Chemical 5 of 15 results Jul 10, 2007 Jun 4, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 5 results Dec 12, 2011 Jul 11, 2012
Dichloroacetic Acid 2451 Organic Chemical 4 of 14 results Jul 10, 2012 Aug 24, 2020
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 17, 2019 Oct 14, 2024
Chloroform 2941 Organic Chemical 2 of 15 results Sep 3, 2014 Sep 4, 2024
Monochloroacetic Acid 2450 Organic Chemical 2 of 14 results Jul 10, 2012 Jul 18, 2019
Trichloroacetic Acid 2452 Organic Chemical 2 of 14 results Sep 3, 2014 Sep 3, 2014
Cadmium 1015 Inorganic Chemical 2 of 11 results Feb 28, 2005 Jan 25, 2006
Selenium 1045 Inorganic Chemical 2 of 11 results Feb 28, 2005 Jan 25, 2006
Monobromoacetic Acid 2453 Organic Chemical 1 of 14 results Aug 24, 2020 Aug 24, 2020
Ethylbenzene 2992 Organic Chemical 1 of 24 results Apr 21, 2008 Apr 21, 2008
Arsenic 1005 Inorganic Chemical 1 of 11 results Apr 2, 2008 Apr 2, 2008

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 257 samples, newest first — collected May 10, 2022 to July 27, 2022. The summary above covers all 257.

29 results from the 10 samples listed here: 17 detected, 12 not detected. Across the whole record it is 369 of 1,193. 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 - Holly Hills, every result from 31 to 40 of 257 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
Jul 27, 2022 08:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220729-003
Laboratory
MSDH Lab
0.025 mg/l , sample collected Jul 27, 2022 08:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 27, 2022 08:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 26, 2022 07:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220729-010
Laboratory
MSDH Lab
0.0245 mg/l , sample collected Jul 26, 2022 07:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 26, 2022 07:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 26, 2022 05:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220729-009
Laboratory
MSDH Lab
0.012 mg/l , sample collected Jul 26, 2022 05:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 26, 2022 05:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 26, 2022 06:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220729-008
Laboratory
MSDH Lab
0.063 mg/l , sample collected Jul 26, 2022 06:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 26, 2022 06:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 26, 2022 09:50
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220729-007
Laboratory
MSDH Lab
0.0464 mg/l , sample collected Jul 26, 2022 09:50, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.7 ug/l , sample collected Jul 26, 2022 09:50, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 26, 2022 06:23
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220729-006
Laboratory
MSDH Lab
0.0679 mg/l , sample collected Jul 26, 2022 06:23, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
1.4 ug/l , sample collected Jul 26, 2022 06:23, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 26, 2022 08:27
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220729-005
Laboratory
MSDH Lab
0.0571 mg/l , sample collected Jul 26, 2022 08:27, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
2.9 ug/l , sample collected Jul 26, 2022 08:27, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 26, 2022 05:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220729-004
Laboratory
MSDH Lab
0.0388 mg/l , sample collected Jul 26, 2022 05:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
1 ug/l , sample collected Jul 26, 2022 05:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jul 26, 2022 11:23
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-220729-002
Laboratory
MSDH Lab
0.0092 mg/l , sample collected Jul 26, 2022 11:23, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 26, 2022 11:23, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
May 10, 2022 13:29
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
IN-220511-033
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 10, 2022 13:29, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0468 mg/l , sample collected May 10, 2022 13:29, 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 May 10, 2022 13:29, sampling point TF080 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0007 mg/l , sample collected May 10, 2022 13:29, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
1.3 mg/l , sample collected May 10, 2022 13:29, 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 May 10, 2022 13:29, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0014 mg/l , sample collected May 10, 2022 13:29, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected May 10, 2022 13:29, 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 May 10, 2022 13:29, 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 May 10, 2022 13:29, 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 May 10, 2022 13:29, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022

Routine (10).