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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 111–120 of 257 samples, newest first — collected February 15, 2012 to January 23, 2013. The summary above covers all 257.

53 results from the 10 samples listed here: 9 detected, 44 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 111 to 120 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
Jan 23, 2013 01:32
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
130124-100NI
Laboratory
MSDH Lab
1.86 mg/l , sample collected Jan 23, 2013 01:32, sampling point TF080 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
1.86 mg/l , sample collected Jan 23, 2013 01:32, sampling point TF080 Nitrate 1040 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 23, 2013 01:32, sampling point TF080 Nitrite 1041 EPA method 353.2 Jan 1, 2013 – Dec 31, 2013
Collected
Jul 11, 2012 13:40
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
201210090084
Laboratory
Radiation Safety Engineering
0.4 pci/l , sample collected Jul 11, 2012 13:40, sampling point TF080 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.55 pci/l Minimum Reporting Level , sample collected Jul 11, 2012 13:40, sampling point TF080 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.403 pci/l Minimum Reporting Level , sample collected Jul 11, 2012 13:40, sampling point TF080 Radium-226 4020 EPA method 903.1 Jul 1, 2012 – Sep 30, 2012
Not detected below 0.55 pci/l Minimum Reporting Level , sample collected Jul 11, 2012 13:40, sampling point TF080 Radium-228 4030 EPA method 904.0 Jul 1, 2012 – Sep 30, 2012
Collected
Jul 10, 2012 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120711-110
Laboratory
Radiation Safety Engineering
0.4 pci/l , sample collected Jul 10, 2012 13:00, sampling point TF080 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.55 pci/l Minimum Reporting Level , sample collected Jul 10, 2012 13:00, sampling point TF080 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.403 pci/l Minimum Reporting Level , sample collected Jul 10, 2012 13:00, sampling point TF080 Radium-226 4020 EPA method 903.1 Jul 1, 2012 – Sep 30, 2012
Not detected below 0.55 pci/l Minimum Reporting Level , sample collected Jul 10, 2012 13:00, sampling point TF080 Radium-228 4030 EPA method 904.0 Jul 1, 2012 – Sep 30, 2012
Collected
Jul 10, 2012 12:40
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
120711-003TH
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 10, 2012 12:40, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 10, 2012 12:40, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 10, 2012 12:40, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 10, 2012 12:40, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 4 ug/l Minimum Reporting Level , sample collected Jul 10, 2012 12:40, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2011 – Dec 31, 2013
Collected
Jul 10, 2012 13:00
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120711-110RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 10, 2012 13:00, sampling point TF080 Combined Uranium 4006 EPA method 200.8 Jul 1, 2012 – Sep 30, 2012
Collected
Jul 10, 2012 12:40
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
120711-003HA
Laboratory
MSDH Lab
0.003 mg/l , sample collected Jul 10, 2012 12:40, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.001 mg/l , sample collected Jul 10, 2012 12:40, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 10, 2012 12:40, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 10, 2012 12:40, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 10, 2012 12:40, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.004 mg/l , sample collected Jul 10, 2012 12:40, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2011 – Dec 31, 2013
Collected
May 16, 2012 12:22
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120517-002VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Dichloromethane 2964 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Benzene 2990 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Toluene 2991 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 16, 2012 12:22, sampling point TF080 Styrene 2996 EPA method 524.2 Jan 1, 2012 – Dec 31, 2012
Collected
Apr 23, 2012 12:20
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120424-154
Laboratory
Radiation Safety Engineering
0.4 pci/l , sample collected Apr 23, 2012 12:20, sampling point TF080 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.55 pci/l Minimum Reporting Level , sample collected Apr 23, 2012 12:20, sampling point TF080 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.403 pci/l Minimum Reporting Level , sample collected Apr 23, 2012 12:20, sampling point TF080 Radium-226 4020 EPA method 903.1 Apr 1, 2012 – Jun 30, 2012
Not detected below 0.55 pci/l Minimum Reporting Level , sample collected Apr 23, 2012 12:20, sampling point TF080 Radium-228 4030 EPA method 904.0 Apr 1, 2012 – Jun 30, 2012
Collected
Apr 23, 2012 12:20
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120424-154RU
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 23, 2012 12:20, sampling point TF080 Combined Uranium 4006 EPA method 200.8 Apr 1, 2012 – Jun 30, 2012
Collected
Feb 15, 2012 12:50
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
120216-093
Laboratory
Radiation Safety Engineering
0.4 pci/l , sample collected Feb 15, 2012 12:50, sampling point TF080 Gross Alpha, Incl. Radon & U 4002 EPA method 00-02 Not recorded
Not detected below 0.55 pci/l Minimum Reporting Level , sample collected Feb 15, 2012 12:50, sampling point TF080 Combined Radium (-226 & -228) 4010 Not recorded
Not detected below 0.403 pci/l Minimum Reporting Level , sample collected Feb 15, 2012 12:50, sampling point TF080 Radium-226 4020 EPA method 903.1 Jan 1, 2012 – Mar 31, 2012
Not detected below 0.55 pci/l Minimum Reporting Level , sample collected Feb 15, 2012 12:50, sampling point TF080 Radium-228 4030 EPA method 904.0 Jan 1, 2012 – Mar 31, 2012

Routine (10).