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.
| 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 71–80 of 221 samples, newest first — collected October 12, 2021 to October 13, 2021. The summary above covers all 221.
20 results from the 10 samples listed here: 11 detected, 9 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 10 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.
| Result | Analyte | Monitoring period |
|---|---|---|
|
||
| 0.0269 mg/l , sample collected Oct 13, 2021 06:30, sampling point LC0007 | Copper, Free 1022 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 13, 2021 06:30, sampling point LC0007 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0072 mg/l , sample collected Oct 13, 2021 06:00, sampling point LC0029 | Copper, Free 1022 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 13, 2021 06:00, sampling point LC0029 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0276 mg/l , sample collected Oct 13, 2021 09:15, sampling point LC0015 | Copper, Free 1022 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 13, 2021 09:15, sampling point LC0015 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0057 mg/l , sample collected Oct 13, 2021 07:46, sampling point LC0031 | Copper, Free 1022 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 13, 2021 07:46, sampling point LC0031 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.117 mg/l , sample collected Oct 13, 2021 07:00, sampling point LC0013 | Copper, Free 1022 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 13, 2021 07:00, sampling point LC0013 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0033 mg/l , sample collected Oct 13, 2021 06:00, sampling point LC0037 | Copper, Free 1022 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 13, 2021 06:00, sampling point LC0037 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0077 mg/l , sample collected Oct 12, 2021 11:19, sampling point LC0018 | Copper, Free 1022 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
| 0.6 ug/l , sample collected Oct 12, 2021 11:19, sampling point LC0018 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0092 mg/l , sample collected Oct 12, 2021 09:00, sampling point LC0011 | Copper, Free 1022 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 12, 2021 09:00, sampling point LC0011 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0239 mg/l , sample collected Oct 12, 2021 08:24, sampling point LC0014 | Copper, Free 1022 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 12, 2021 08:24, sampling point LC0014 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0033 mg/l , sample collected Oct 12, 2021 07:00, sampling point LC0006 | Copper, Free 1022 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 12, 2021 07:00, sampling point LC0006 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
-
- Collected
- Oct 13, 2021 06:30
- Sampling point
- LC0007 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-076
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0269 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 13, 2021 06:00
- Sampling point
- LC0029 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-075
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0072 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 13, 2021 09:15
- Sampling point
- LC0015 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-074
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0276 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 13, 2021 07:46
- Sampling point
- LC0031 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-081
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0057 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 13, 2021 07:00
- Sampling point
- LC0013 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-082
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.117 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 13, 2021 06:00
- Sampling point
- LC0037 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-083
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0033 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 12, 2021 11:19
- Sampling point
- LC0018 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-063
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0077 mg/l
-
Lead 1030 EPA method 200.8
- Result
- 0.6 ug/l
-
- Collected
- Oct 12, 2021 09:00
- Sampling point
- LC0011 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-062
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0092 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 12, 2021 08:24
- Sampling point
- LC0014 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-061
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0239 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 12, 2021 07:00
- Sampling point
- LC0006 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-060
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0033 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
Routine (10).