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; the list of samples further down is narrowed.
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 | 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 |
Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.
Choose a date range
The most recent samples, result by result
The table below lists 1–10 of 20 samples, newest first — collected July 29, 2025 to February 23, 2026. The summary above covers all 20.
21 results from the 10 samples listed here: 12 detected, 9 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.
| Result | Analyte | Monitoring period |
|---|---|---|
|
||
| 2.02 mg/l , sample collected Feb 23, 2026 09:00, sampling point TF080 | Nitrate-Nitrite 1038 EPA method QC10107041C | Jan 1, 2026 – Dec 31, 2026 |
| 2.02 mg/l , sample collected Feb 23, 2026 09:00, sampling point TF080 | Nitrate 1040 EPA method QC10107041C | Jan 1, 2026 – Dec 31, 2026 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 23, 2026 09:00, sampling point TF080 | Nitrite 1041 EPA method QC10107041C | Jan 1, 2026 – Dec 31, 2026 |
|
||
| 0.18 mg/l , sample collected Jul 30, 2025 13:35, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
| 3.2 ug/l , sample collected Jul 30, 2025 13:35, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
|
||
| 0.0279 mg/l , sample collected Jul 30, 2025 06:00, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 30, 2025 06:00, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
|
||
| 0.0209 mg/l , sample collected Jul 30, 2025 11:02, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 30, 2025 11:02, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
|
||
| 0.0231 mg/l , sample collected Jul 30, 2025 06:00, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 30, 2025 06:00, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
|
||
| 0.0114 mg/l , sample collected Jul 29, 2025 06:00, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 29, 2025 06:00, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
|
||
| 0.0178 mg/l , sample collected Jul 29, 2025 06:00, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 29, 2025 06:00, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
|
||
| 0.0099 mg/l , sample collected Jul 29, 2025 05:15, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 29, 2025 05:15, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
|
||
| 0.0111 mg/l , sample collected Jul 29, 2025 08:00, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 29, 2025 08:00, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
|
||
| 0.0174 mg/l , sample collected Jul 29, 2025 09:04, sampling point DS000 | Copper, Free 1022 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
| Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 29, 2025 09:04, sampling point DS000 | Lead 1030 EPA method 200.8 | Jan 1, 2023 – Dec 31, 2025 |
-
- Collected
- Feb 23, 2026 09:00
- Sampling point
- TF080 Treatment Plant T080
- Sample type
- Routine
- Lab sample
- NI-260224-013
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2026 – Dec 31, 2026
-
Nitrate-Nitrite 1038 EPA method QC10107041C
- Result
- 2.02 mg/l
-
Nitrate 1040 EPA method QC10107041C
- Result
- 2.02 mg/l
-
Nitrite 1041 EPA method QC10107041C
- Result
- Not detected below 0.02 mg/l Minimum Reporting Level
-
- Collected
- Jul 30, 2025 13:35
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-250731-004
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.18 mg/l
-
Lead 1030 EPA method 200.8
- Result
- 3.2 ug/l
-
- Collected
- Jul 30, 2025 06:00
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-250731-003
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0279 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Jul 30, 2025 11:02
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-250731-002
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0209 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Jul 30, 2025 06:00
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-250731-001
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0231 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Jul 29, 2025 06:00
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-250731-010
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0114 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Jul 29, 2025 06:00
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-250731-009
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0178 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Jul 29, 2025 05:15
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-250731-008
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0099 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Jul 29, 2025 08:00
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-250731-007
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0111 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
-
- Collected
- Jul 29, 2025 09:04
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- PB-250731-006
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2023 – Dec 31, 2025
-
Copper, Free 1022 EPA method 200.8
- Result
- 0.0174 mg/l
-
Lead 1030 EPA method 200.8
- Result
- Not detected below 0.5 ug/l Minimum Reporting Level
Routine (10).