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 61–70 of 221 samples, newest first — collected October 19, 2021 to April 19, 2022. The summary above covers all 221.

45 results from the 10 samples listed here: 9 detected, 36 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 3 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 61 to 70 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 19, 2022 08:15 Sampling point LC0026 Location withheld Sample type Routine Lab sample PB-220421-052 Laboratory MSDH Lab
0.0025 mg/l , sample collected Apr 19, 2022 08:15, sampling point LC0026	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 19, 2022 08:15, sampling point LC0026	Lead 1030 EPA method 200.8	Jan 1, 2022 – Jun 30, 2022
Collected Apr 18, 2022 11:00 Sampling point LC0039 Location withheld Sample type Routine Lab sample PB-220422-011 Laboratory MSDH Lab
0.016 mg/l , sample collected Apr 18, 2022 11:00, sampling point LC0039	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 18, 2022 11:00, sampling point LC0039	Lead 1030 EPA method 200.8	Jan 1, 2022 – Jun 30, 2022
Collected Apr 18, 2022 09:00 Sampling point LC0002 Location withheld Sample type Routine Lab sample PB-220421-051 Laboratory MSDH Lab
0.0062 mg/l , sample collected Apr 18, 2022 09:00, sampling point LC0002	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 18, 2022 09:00, sampling point LC0002	Lead 1030 EPA method 200.8	Jan 1, 2022 – Jun 30, 2022
Collected Mar 1, 2022 13:40 Sampling point MRT000 Max. Res. Time Sample type Routine Lab sample HA-220302-017 Laboratory MSDH Lab
1.77 ug/l , sample collected Mar 1, 2022 13:40, sampling point MRT000	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Not recorded
Collected Mar 1, 2022 13:40 Sampling point MRT000 Max. Res. Time Sample type Routine Lab sample TH-220302-017 Laboratory MSDH Lab
5.78 ug/l , sample collected Mar 1, 2022 13:40, sampling point MRT000	TTHM 2950 EPA method 524.2	Not recorded
Collected Feb 23, 2022 14:06 Sampling point TF080 Treatment Plant TF080 Sample type Routine Lab sample IN-220224-017 Laboratory MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 23, 2022 14:06, sampling point TF080	Arsenic 1005 EPA method 200.8	Jan 1, 2022 – Dec 31, 2022
0.0548 mg/l , sample collected Feb 23, 2022 14:06, sampling point TF080	Barium 1010 EPA method 200.8	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 23, 2022 14:06, sampling point TF080	Cadmium 1015 EPA method 200.8	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 23, 2022 14:06, sampling point TF080	Chromium 1020 EPA method 200.8	Jan 1, 2022 – Dec 31, 2022
0.132 mg/l , sample collected Feb 23, 2022 14:06, sampling point TF080	Fluoride 1025 EPA method QC 10-109-12-2-A	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 23, 2022 14:06, sampling point TF080	Mercury 1035 EPA method 200.8	Jan 1, 2022 – Dec 31, 2022
0.001 mg/l , sample collected Feb 23, 2022 14:06, sampling point TF080	Nickel 1036 EPA method 200.8	Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 23, 2022 14:06, sampling point TF080	Selenium 1045 EPA method 200.8	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 23, 2022 14:06, sampling point TF080	Antimony, Total 1074 EPA method 200.8	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 23, 2022 14:06, sampling point TF080	Beryllium, Total 1075 EPA method 200.8	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 23, 2022 14:06, sampling point TF080	Thallium, Total 1085 EPA method 200.8	Jan 1, 2022 – Dec 31, 2022
Collected Feb 23, 2022 14:04 Sampling point TF080 Treatment Plant TF080 Sample type Routine Lab sample CN-220224-014 Laboratory MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Feb 23, 2022 14:04, sampling point TF080	Cyanide 1024 EPA method QC10204001X	Jan 1, 2022 – Mar 31, 2022
Collected Jan 18, 2022 13:22 Sampling point TF080 Treatment Plant TF080 Sample type Routine Lab sample VO-220119-031 Laboratory MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, 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 Jan 18, 2022 13:22, sampling point TF080	Styrene 2996 EPA method 524.2	Jan 1, 2022 – Dec 31, 2022
Collected Jan 10, 2022 12:50 Sampling point TF080 Treatment Plant TF080 Sample type Routine Lab sample NI-220111-045 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 10, 2022 12:50, sampling point TF080	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 10, 2022 12:50, sampling point TF080	Nitrate 1040 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
0.0234 mg/l , sample collected Jan 10, 2022 12:50, sampling point TF080	Nitrite 1041 EPA method QC10107041C	Jan 1, 2022 – Dec 31, 2022
Collected Oct 19, 2021 13:13 Sampling point TF080 Treatment Plant TF080 Sample type Routine Lab sample CN-211020-003 Laboratory MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Oct 19, 2021 13:13, sampling point TF080	Cyanide 1024 EPA method QC10204001X	Oct 1, 2021 – Dec 31, 2021

Collected
Apr 19, 2022 08:15

Sampling point
LC0026 Location withheld

Sample type
Routine

Lab sample
PB-220421-052

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2022 – Jun 30, 2022
- Copper, Free 1022 EPA method 200.8
  
  Result
  0.0025 mg/l
- Lead 1030 EPA method 200.8
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
Collected
Apr 18, 2022 11:00

Sampling point
LC0039 Location withheld

Sample type
Routine

Lab sample
PB-220422-011

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2022 – Jun 30, 2022
- Copper, Free 1022 EPA method 200.8
  
  Result
  0.016 mg/l
- Lead 1030 EPA method 200.8
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
Collected
Apr 18, 2022 09:00

Sampling point
LC0002 Location withheld

Sample type
Routine

Lab sample
PB-220421-051

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2022 – Jun 30, 2022
- Copper, Free 1022 EPA method 200.8
  
  Result
  0.0062 mg/l
- Lead 1030 EPA method 200.8
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
Collected
Mar 1, 2022 13:40

Sampling point
MRT000 Max. Res. Time

Sample type
Routine

Lab sample
HA-220302-017

Laboratory
MSDH Lab

Monitoring period
Not recorded
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  1.77 ug/l
Collected
Mar 1, 2022 13:40

Sampling point
MRT000 Max. Res. Time

Sample type
Routine

Lab sample
TH-220302-017

Laboratory
MSDH Lab

Monitoring period
Not recorded
- TTHM 2950 EPA method 524.2
  
  Result
  5.78 ug/l
Collected
Feb 23, 2022 14:06

Sampling point
TF080 Treatment Plant TF080

Sample type
Routine

Lab sample
IN-220224-017

Laboratory
MSDH Lab
- Arsenic 1005 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2022 – Dec 31, 2022
- Barium 1010 EPA method 200.8
  
  Result
  0.0548 mg/l
  
  Monitoring period
  Jan 1, 2022 – Dec 31, 2022
- Cadmium 1015 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2022 – Dec 31, 2022
- Chromium 1020 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2022 – Dec 31, 2022
- Fluoride 1025 EPA method QC 10-109-12-2-A
  
  Result
  0.132 mg/l
  
  Monitoring period
  Jan 1, 2022 – Dec 31, 2022
- Mercury 1035 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2022 – Dec 31, 2022
- Nickel 1036 EPA method 200.8
  
  Result
  0.001 mg/l
  
  Monitoring period
  Not recorded
- Selenium 1045 EPA method 200.8
  
  Result
  Not detected below 0.0025 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2022 – Dec 31, 2022
- Antimony, Total 1074 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2022 – Dec 31, 2022
- Beryllium, Total 1075 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2022 – Dec 31, 2022
- Thallium, Total 1085 EPA method 200.8
  
  Result
  Not detected below 0.0005 mg/l Minimum Reporting Level
  
  Monitoring period
  Jan 1, 2022 – Dec 31, 2022
Collected
Feb 23, 2022 14:04

Sampling point
TF080 Treatment Plant TF080

Sample type
Routine

Lab sample
CN-220224-014

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2022 – Mar 31, 2022
- Cyanide 1024 EPA method QC10204001X
  
  Result
  Not detected below 0.015 mg/l Minimum Reporting Level
Collected
Jan 18, 2022 13:22

Sampling point
TF080 Treatment Plant TF080

Sample type
Routine

Lab sample
VO-220119-031

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2022 – Dec 31, 2022
- 1,2,4-Trichlorobenzene 2378 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Cis-1,2-Dichloroethylene 2380 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Xylenes, Total 2955 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Dichloromethane 2964 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- O-Dichlorobenzene 2968 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- P-Dichlorobenzene 2969 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Vinyl Chloride 2976 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1-Dichloroethylene 2977 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Trans-1,2-Dichloroethylene 2979 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,2-Dichloroethane 2980 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1,1-Trichloroethane 2981 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Carbon Tetrachloride 2982 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,2-Dichloropropane 2983 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Trichloroethylene 2984 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1,2-Trichloroethane 2985 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Tetrachloroethylene 2987 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Chlorobenzene 2989 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Benzene 2990 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Toluene 2991 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Ethylbenzene 2992 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Styrene 2996 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
Collected
Jan 10, 2022 12:50

Sampling point
TF080 Treatment Plant TF080

Sample type
Routine

Lab sample
NI-220111-045

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2022 – Dec 31, 2022
- Nitrate-Nitrite 1038 EPA method QC10107041C
  
  Result
  Not detected below 0.1 mg/l Minimum Reporting Level
- Nitrate 1040 EPA method QC10107041C
  
  Result
  Not detected below 0.08 mg/l Minimum Reporting Level
- Nitrite 1041 EPA method QC10107041C
  
  Result
  0.0234 mg/l
Collected
Oct 19, 2021 13:13

Sampling point
TF080 Treatment Plant TF080

Sample type
Routine

Lab sample
CN-211020-003

Laboratory
MSDH Lab

Monitoring period
Oct 1, 2021 – Dec 31, 2021
- Cyanide 1024 EPA method QC10204001X
  
  Result
  Not detected below 0.015 mg/l Minimum Reporting Level

Routine (10).