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 81–90 of 221 samples, newest first — collected October 11, 2021 to October 12, 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 8 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 |
|---|---|---|
|
||
| 0.0044 mg/l , sample collected Oct 12, 2021 07:00, sampling point LC0003 | 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 LC0003 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0069 mg/l , sample collected Oct 12, 2021 07:00, sampling point LC0021 | Copper, Free 1022 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
| 0.5 ug/l , sample collected Oct 12, 2021 07:00, sampling point LC0021 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0214 mg/l , sample collected Oct 12, 2021 06:40, sampling point LC0016 | 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 06:40, sampling point LC0016 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0307 mg/l , sample collected Oct 12, 2021 05:45, sampling point LC0022 | 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 05:45, sampling point LC0022 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0246 mg/l , sample collected Oct 12, 2021 06:00, sampling point DS000 | 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 06:00, sampling point DS000 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0043 mg/l , sample collected Oct 12, 2021 06:00, sampling point LC0038 | 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 06:00, sampling point LC0038 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0047 mg/l , sample collected Oct 12, 2021 08:00, sampling point LC0028 | 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 08:00, sampling point LC0028 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0025 mg/l , sample collected Oct 12, 2021 08:00, sampling point LC0023 | 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 08:00, sampling point LC0023 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.0055 mg/l , sample collected Oct 12, 2021 08:00, sampling point LC0026 | 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 08:00, sampling point LC0026 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
|
||
| 0.025 mg/l , sample collected Oct 11, 2021 20:03, sampling point DS000 | 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 11, 2021 20:03, sampling point DS000 | Lead 1030 EPA method 200.8 | Jul 1, 2021 – Dec 31, 2021 |
-
- Collected
- Oct 12, 2021 07:00
- Sampling point
- LC0003 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-059
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0044 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
- LC0021 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-058
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0069 mg/l
-
Lead 1030 EPA method 200.8
- Result
- 0.5 ug/l
-
- Collected
- Oct 12, 2021 06:40
- Sampling point
- LC0016 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-057
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0214 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 12, 2021 05:45
- Sampling point
- LC0022 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-056
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0307 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 12, 2021 06:00
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-211014-055
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0246 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 12, 2021 06:00
- Sampling point
- LC0038 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-079
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0043 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 12, 2021 08:00
- Sampling point
- LC0028 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-080
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0047 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 12, 2021 08:00
- Sampling point
- LC0023 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-078
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
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
- Oct 12, 2021 08:00
- Sampling point
- LC0026 Location withheld
- Sample type
- Routine
- Lab sample
- PB-211014-077
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0055 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Oct 11, 2021 20:03
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-211014-054
- Laboratory
- MSDH Lab
- Monitoring period
- Jul 1, 2021 – Dec 31, 2021
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.025 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
Routine (10).